Startseite Comparison of several seismic active earth pressure calculation methods for retaining structures
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Comparison of several seismic active earth pressure calculation methods for retaining structures

  • Xin Huang , Yanyang Qiao , Xiaoguang Cai EMAIL logo , Jingshan Bo , Sihan Li und Yueqiang Li
Veröffentlicht/Copyright: 15. Oktober 2025
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Abstract

Earthquake earth pressure is one of the key parameters for the seismic design of retaining structures. In this work, the seismic earth pressure calculation methods used in the design specifications of retaining walls, bridge abutments, and other retaining structures in various countries are summarized. Moreover, different calculation methods and examples are analysed and compared. A comparison shows that most of the specifications used or modified the M-O method for calculating seismic active earth pressure, and the calculation approach is basically consistent. The difference in the seismic active earth pressure at the bottom of the retaining walls calculated with various specifications gradually increases with increasing seismic peak acceleration. The coefficient of seismic active earth pressure and the resultant force of seismic active earth pressure both increase with increasing seismic peak acceleration. The calculation method, which considers the additional load at the top, results in a seismic earth pressure resultant force point at a height of above 1/3H. When calculating the seismic active earth pressure of reinforced soil structures under various specifications, the effect of reinforcement materials on the reduction in wall back earth pressure is not considered, and the calculation results are relatively conservative. The comparison results can provide a reference for the optimization and improvement of the seismic design of retaining structures, such as reinforced earth retaining walls.

1 Introduction

In the design of seismic stability in internal and external retaining structures, the calculation of the seismic active earth pressure on the wall back is considered a core component of structural strength verification. Scholars from various countries have conducted extensive research on the seismic earth pressure of retaining structures, employing five primary methods: limit equilibrium analysis, limit displacement theory, pseudodynamic research, finite element analysis, and experimental research. The limit equilibrium method is a quasistatic calculation method. Owing to its simplicity, clear physical significance, and small computational workload, this method is widely used in practice.

On the basis of the Coulomb earth pressure theory, Japanese scholars Mononobe and Matsuo [1] and Okabe [2] proposed the Mononobe–Okabe (M-O) method for calculating the active earth pressure on the back of retaining structure walls. In essence, this method is a quasistatic method that considers the horizontal and vertical seismic acceleration. This method has the following shortcomings according to Wu [3]: (1) the horizontal magnification factor of the retaining walls along the height direction is not considered; (2) the influence of the horizontal seismic inertia of the retaining wall is ignored; (3) the method is only applicable to cohesionless soil as the filler behind the wall without considering the cohesion of the filler; and (4) the acting point of the seismic earth pressure resultant force is considered to be located at 1/3 the height of the retaining wall. Seed and Whitman [4] modified the M-O method to obtain the seismic earth pressure through the peak acceleration of ground motion and the internal friction angle of fill. Sherif and Fang [5] considered the influence of wall rotation on earth pressure of retaining walls and demonstrated the accuracy of the – M-O method. In the study of highway abutment by Li [6], a formula for calculating seismic earth pressure by the horizontal seismic coefficient was derived to eliminate the seismic angle. Liang [7] overcame the drawbacks of the M-O method (requiring the seismic angle to be less than the friction angle) by studying the characteristics of the earth pressure error and railway load when the wall back inclination is large, and the scholars derived a new formula. Zhao [8] reported the corresponding calculation formula of earth pressure for cohesionless soil and cohesive soil. Chen et al. [9] derived the generalized physical part of the M-O calculation formula and applied it to the cohesive soil retaining walls through the re-exploration and research of the generalized Coulomb theory. Wang et al. [10] proposed the calculation model for the seismic active earth pressure that considers time and phase changes for cohesive soil and cohesionless soil, respectively, on the basis of the pseudodynamic method. Zhang and Song [11] investigated the earth pressure coefficient with the strain increment ratio on the basis of the law of change. They proposed a practical calculation method in which the seismic earth pressure can be considered the lateral deformation of fill. The reasonableness of the method was verified through the earth pressure model test results. Yang et al. [12] deduced the seismic earth pressure calculation formula for reinforced gravity retaining walls according to the force polygon method. Zhou et al. [13] considered the effects of the rotation of the principal stresses, time effects, and wall–back inclination, and derived a new solution for the seismic active failure angle by the pseudodynamic method, according to the total force equilibrium of the sliding soil mass. Through a horizontal differential layer method, new differential equations of the normal seismic active earth pressure and the coefficient for an inclined rigid retaining wall were obtained while considering translation. Yu [14], on the basis of the upper bound method of plastic limit analysis and the quasistatic method, adopted a logarithmic spiral surface as the slip surface, and established a calculation method for the seismic earth pressure of the reinforced gravity wall. Wang et al. [15] established a calculation method for the active earth pressure of unsaturated fill under earthquake action for gravity retaining walls on the basis of the upper bound principle of limit analysis. Du et al. [16] proposed two calculation methods for the earth pressure of gravity reinforced earth retaining walls under different reinforcement strength and pressure conditions on the basis of the quasicohesion method and working stress principle of reinforced earth. Li et al. [17,18] deduced a calculation method for the seismic active earth pressure considering the displacement modes of reinforced earth retaining walls on the basis of the force polygon method and Winkler foundation beam model, and analysed the influences of different panel forms on the seismic earth pressure distributions of reinforced earth retaining walls.

Owing to different project types and industries, the calculation methods of seismic earth pressure vary in the seismic design specifications for various retaining structures in different countries. In this work, the calculation methods of seismic earth pressure in seismic design specifications of several common types of retaining structures are discussed, and the calculation results of the seismic earth pressure of retaining walls under different seismic loads in retaining wall structures with overlying loads are compared and analysed.

2 Calculation method of seismic earth pressure

2.1 M-O method

The M-O method was proposed by Japanese scholars Mononobe and Okabe in 1924 to calculate the active earth pressure at the back of the retaining structure wall on the basis of the Coulomb earth pressure theory. In essence, this method is a quasistatic method considering the horizontal and vertical seismic acceleration. This method has four basic assumptions: (1) The fill behind the wall is homogeneous and cohesionless and composed of unsaturated soil, and the internal friction angle of the fill is a fixed value. (2) The retaining wall can produce enough lateral displacement to yield the filling at the back of the wall with a shear sliding fracture surface. (3) At this time, the earth pressure acting on the back of the wall is the minimum. (4) The fracture surface is the plane passing through the heel of the wall. The retaining wall is in plane plane-strain state.

The calculation formulas of seismic active earth pressure E ea and active earth pressure coefficient K ea obtained from limit equilibrium conditions and Coulomb earth pressure theory are as follows.

(1) E e a = 1 2 γ H 2 K e a ( 1 K v ) ,

(2) K e a = cos 2 ( φ α θ ) cos θ cos 2 α cos ( α + θ + δ ) 1 + sin ( φ + δ ) sin ( φ β θ ) cos ( α β ) cos ( α + θ + δ ) 2 ,

(3) tan θ = K h 1 K v ,

where γ is the gravity of soil mass, H is the height of the retaining wall, K h is the horizontal acceleration coefficient, K v is the vertical acceleration coefficient, θ is the seismic angle, φ is the internal friction angle of the soil, δ is the friction angle between the wall and soil, α is the angle between the retaining wall and the vertical direction, and β is the angle between the fill and horizontal direction. The stress of the sliding soil wedge behind the wall is shown in Figure 1.

Figure 1 
                  Schematic diagram of the force on the sliding soil wedge behind the wall.
Figure 1

Schematic diagram of the force on the sliding soil wedge behind the wall.

2.2 Guidelines for seismic design of highway bridges (JTG/T B02-01-2008) [19]

This code is a standard for the highway engineering industry. The calculation of the seismic dynamic earth pressure at the back of the abutment wall in this code considers the cohesion of the fill, the adhesion on the contact surface between the abutment and soil at the back of the wall, and the uniformly distributed load on the sliding soil wedge. The calculation formula is derived on the basis of the M-O formula. The specific formulas of the seismic active earth pressure E ea and active earth pressure coefficient K a are as follows:

(4) E e a = 1 2 γ H 2 + q H cos α cos ( α - β ) K a 2 c H K c a ,

(5) K a = cos 2 ( φ α θ ) cos θ cos 2 α cos ( α + θ + δ ) 1 + sin ( φ + δ ) sin ( φ β θ ) cos ( α β ) cos ( α + θ + δ ) 2 ,

(6) K c a = 1 sin φ cos φ ,

where γ is the filling weight, H is the height of the abutment retaining wall, q is the uniformly distributed load on the sliding soil wedge, α is the angle between the retaining wall and the vertical direction, β is the angle between the filling surface and the horizontal plane, c is the cohesion of the cohesive fill, δ is the friction angle between the wall and soil, θ is the seismic angle, φ is the internal friction angle of the soil, and K ca is the cohesive earth pressure coefficient of the fill. When the overlying load is q = 0, the location of the action point of seismic earth pressure can be taken as H/3 from the bottom of the abutment. When q ≠ 0, the position of the seismic earth pressure action point is H/3 plus the fill height converted by q. The calculation diagram is shown in Figure 2.

Figure 2 
                  Schematic diagram of the seismic active earth pressure calculation (JTG/T B02-01-2008) [19].
Figure 2

Schematic diagram of the seismic active earth pressure calculation (JTG/T B02-01-2008) [19].

When the filling behind the abutment is cohesionless soil, the following simplified formula can be used to calculate the seismic active earth pressure E ea and the active earth pressure coefficient K a :

(7) E e a = 1 2 γ H 2 K A 1 + 3 C i A g tan φ ,

(8) K A = cos 2 φ ( 1 + sin φ ) 2 ,

where C i is the seismic importance coefficient, A is the peak horizontal seismic acceleration design, and g is the acceleration due to gravity. The action point of the seismic active earth pressure is 0.4H away from the abutment bottom.

2.3 Code for seismic design of railway engineering (2009) (GB 50111-2006) [20]

This code is a railway engineering industry standard, which stipulates that in the seismic design of bridge abutments, the seismic action of bridge abutments shall be calculated using the static method according to the design earthquake, and the seismic active earth pressure acting on the back of the abutment is calculated according to Coulomb’s theory. However, the gravity γ of the fill, the internal friction angle φ of the fill, and the friction angle δ between the wall soil and the back of the wall should be corrected by the seismic angle θ in the Coulomb formula before calculation, according to the influence of the seismic action. The seismic active earth pressure E ea , active earth pressure coefficient K a , and parameter correction formula of the abutment are as follows:

(9) E e a = 1 2 γ E H 2 K a ,

(10) K a = cos 2 ( φ E α ) cos 2 α cos ( α + δ E ) 1 + sin ( φ E + δ E ) sin ( φ E β ) cos ( α + δ E ) cos ( α β ) 2 ,

(11) γ E = γ cos θ ,

(12) φ E = φ θ ,

(13) δ E = δ + θ ,

where γ E is the corrected filling weight, H is the height of the abutment retaining wall, α is the angle between the retaining wall and the vertical direction, β is the angle between the surface of the filled soil and the horizontal plane, φ E is the corrected internal friction angle of the filled soil, δ E is the corrected friction angle between the wall and the soil behind the wall, and θ is the seismic angle. The action point of the seismic active earth pressure is H/3 away from the abutment bottom.

2.4 Code for seismic design of urban bridges (CJJ166-2011) [21]

This code is a standard for the urban construction industry. The code considers that, in general, only horizontal seismic actions can be considered for urban bridge structures, and seismic actions along and across the bridge can be considered for straight-line bridges. The formulas for calculating the active earth pressure E ea and the active earth pressure coefficient K a of the abutment back under earthquake loading are as follows:

(14) E e a = 1 2 γ H 2 K A 1 + 3 A g tan φ ,

(15) K A = cos 2 φ ( 1 + sin φ ) 2 ,

where γ is the filling weight, H is the height of the abutment retaining wall, A is the peak value of the horizontal design ground motion acceleration, φ is the internal friction angle of the soil, and g is the acceleration due to gravity. The action point of the seismic active earth pressure is 0.4H away from the bottom of the abutment.

Compared with the calculation method of the guidelines for seismic design of highway bridges (JTG/T B02-01-2008), the calculation method of seismic active earth pressure in this code ignores the seismic importance coefficient of the abutment, and does not consider the nature of the fill, the fill and wall back angle, the top load, etc. It belongs to a simplified calculation method.

2.5 Code for design of highway reinforced earth engineering (JTJ 015-91) [22]

This code is specifically applicable to highway reinforced soil slopes, reinforced soil embankments, etc. When calculating the seismic active earth pressure in the code, the structural importance of different highway grades, reinforced soil structure types, and horizontal seismic coefficients under different intensities is considered. The specific formulas of the seismic active earth pressure E ea and active earth pressure coefficient K a are as follows:

(16) E e a = 1 2 γ H 2 K a ( 1 + 3 C i C z K h tan φ ) ,

(17) K a = tan 2 45 ° φ 2 ,

where γ is the filling weight, H is the height of the abutment retaining wall, C i is the structural importance correction coefficient of the highway grade, C Z is the comprehensive influence coefficient of the structure type, K h is the horizontal seismic coefficient, and φ is the internal friction angle of the soil. The action point of the seismic active earth pressure is 0.4H away from the bottom of the abutment.

In addition, when the filling surface at the back of the wall is an embankment slope, the unit weight γ, the internal friction angle φ, and the friction angle δ of the filling in (16) and (17) should be corrected according to the seismic angle. The specific correction formulas are as follows.

(18) γ E = γ cos θ ,

(19) φ E = φ θ ,

where γ E is the corrected filling weight, φ E is the corrected internal friction angle of the fill, δ E is the friction angle between the wall and the soil at the back of the wall after correction, and θ is the seismic angle.

2.6 U.S. NCMA code (National Concrete Masonry Association, 2012) [23]

The code provides an analysis and design method for ensuring the stability of segmental retaining walls (SRW) under seismic loads. The M-O method is used to calculate the seismic dynamic earth pressure in the seismic design. The horizontal and vertical accelerations are assumed to be constant in the face slab, reinforced area, and backfill area. The calculation formulas for the seismic active earth pressure E ea and active earth pressure coefficient K ea are as follows:

(20) E e a = 1 2 γ H 2 K e a ( 1 ± K v ) ,

(21) K e a = cos 2 ( φ + ω θ ) cos θ cos 2 ω cos ( δ ω + θ ) 1 + sin ( φ + δ ) sin ( φ β θ ) cos ( ω + β ) cos ( δ ω + θ ) 2 ,

(22) tan θ = K h 1 ± K v ,

(23) δ = 2 φ 3 ,

where γ is the filling weight, H is the height of the retaining wall, K h is the horizontal acceleration coefficient, K v is the vertical seismic acceleration coefficient, “+” corresponds to the downward seismic inertia force, “−” corresponds to the upward seismic inertia force, θ is the seismic angle, φ is the internal friction angle of the soil, ω is the angle between the retaining wall and the vertical direction, and is considered a positive value when the retaining wall is inclined in the filling direction at the back of the wall, δ is the friction angle between the wall and the soil, and β is the angle between the fill and the horizontal direction.

2.7 Design standards for railway structures are explained in the same way as those for retaining structures (2012) [24]

This code is a Japanese railway structure design standard applicable to retaining structures. The code provides a more comprehensive design method for reinforced earth retaining walls and reinforced earth abutments. In the code, the ground motion levels are divided into L1 and L2. L1 is the conventional earthquake that will inevitably occur within the design life of the structure, and L2 is the ground motion with a very low probability of occurrence but very high intensity within the design life of the structure. Compared with the Chinese seismic design specifications, L1 and L2 correspond to the design earthquake and rare earthquake in China, respectively [25].

The seismic active earth pressure (p AE) and active earth pressure coefficient (K AE ) of the reinforced earth abutment under the L1 ground motion level are calculated by the M-O method, and the calculation formulas are as follows.

(24) p AE = γ h K AE + q cos α cos ( α β ) K AE ,

(25) K AE = cos 2 ( φ α θ ) cos θ cos 2 α cos ( α + θ + δ ) 1 + sin ( φ + δ ) sin ( φ β θ ) cos ( α β ) cos ( α + θ + δ ) 2 ,

(26) tan θ = a max g ,

(27) δ = φ 2 ,

where γ is the filling weight, H is the height of the retaining wall, q is the uniformly distributed load on the sliding soil wedge, α is the angle between the retaining wall and the vertical direction, β is the angle between the filling and the horizontal direction, φ is the internal friction angle of the soil, θ is the inclination angle between the resultant force and the vertical direction, δ is the friction angle between the wall and the soil, a max is the design ground motion peak acceleration, and g is the acceleration due to gravity. The action point of seismic active earth pressure is located at a height of H/3 from the bottom of the abutment.

During L2 ground motion, the dynamic characteristics (i.e. peak strength and residual strength) of the fill behind the wall after a strong earthquake are considered; thus, the M-O method is modified. The calculation formulas of the modified seismic active earth pressure coefficient K AE are as follows:

(28) K AE = cos ( ψ φ ) ( 1 + tan 2 α ) ( 1 + tan α tan β ) [ tan ( ψ φ ) + tan θ ] cos ( ψ φ α δ ) ( tan ψ tan β ) ,

(29) cot ( ψ β ) = tan ( φ + δ + α β ) + sec ( φ + δ + α β ) cos ( α + δ + θ ) sin ( φ + δ ) cos ( α β ) sin ( φ β θ ) ,

where ψ is the angle between the sliding surface and the horizontal plane. The meanings of other symbols are the same as above. Compared with the previous M-O method, the change in the earth pressure with increasing ground motion is more in line with field monitoring practices, and the active earth pressure during an earthquake can be reasonably calculated even for a large earthquake inertia force.

2.8 French code for design of reinforced soil (NF P 94-270, 2020) [26]

The calculation method of the seismic earth pressure of reinforced earth structure under seismic action in this code is also based on the M-O method, which is similar to the calculation method in the National Concrete Masonry Association code (NCMA, 2012). However, this code considers the influences of the top filling plane angle and horizontal displacement of the panel. The seismic active earth pressure E d and the active earth pressure coefficient K of the homogeneous soil layer can be calculated by the M-O method:

(30) E d = 1 2 γ H 2 K ( 1 ± k v ) .

When β φ d θ ,

(31) K = sin 2 ( ψ + φ d θ ) cos θ sin 2 ψ sin ( ψ θ δ d ) 1 + sin ( φ d + δ d ) sin ( φ d β θ ) sin ( ψ + β ) sin ( ψ θ δ d ) 2 .

When β > φ d θ ,

(32) K = sin 2 ( ψ + φ d θ ) cos θ sin 2 ψ sin ( ψ θ δ d ) ,

(33) tan θ = k h 1 ± k v ,

(34) ψ = π 2 + η 2 ,

(35) k h = S r a g g ,

where γ is the filling weight, H is the height of the retaining wall, K h is the horizontal acceleration coefficient, K v is the vertical seismic acceleration coefficient, “+” corresponds to the downward seismic inertia force, “−” corresponds to the upward seismic inertia force, β is the angle between the filling and the horizontal direction, φ d is the internal friction angle of fill, θ is the seismic angle, η 2 is the angle between the retaining wall and the vertical direction, ψ is the angle between the potential fracture surface passing through the wall heel and the horizontal direction, δ d is the friction angle between the wall and soil, S is the geotechnical coefficient under different site types, r is the horizontal seismic coefficient correction value, a g is the design ground motion peak acceleration, and g is the acceleration due to gravity.

2.9 Other specifications

In addition, the calculation methods for seismic dynamic earth pressure given in the specification of seismic design for highway engineering (JTG B02-2013) [27] and specifications for design of highway subgrades (JTG D30-2015) [28] are the same as those in the guidelines for seismic design of highway bridges (JTG/T B02-01-2008). In the local standard technical code for technical specifications for design and construction of flexible ecological reinforced earth retaining wall (DB33/T 988-2022) [29], the limit state design method is used to obtain the calculation method of active earth pressure to evaluate the external stability of reinforced retaining walls. However, the relevant provisions in the specification of seismic design for highway engineering (JTG B02-2013) are still used in the seismic design calculation, and the calculation method is the same as that in the guidelines for seismic design of highway bridges (JTG/T B02-01-2008).

3 Comparison of various calculation methods

The M-O method is generally used in the calculation of seismic earth pressure in various codes. However, some methods involve modifying the M-O formula according to the assumption considered, while keeping the calculation idea and process of seismic earth pressure basically the same. The objectives of these methods are as follows: (1) determine the importance coefficient of the project or structure; (2) determine the horizontal seismic influence coefficient and calculate the seismic angle; (3) determine the parameters in other earth pressure coefficients according to the design drawing of the retaining structure; (4) calculate the seismic earth pressure coefficient; and (5) calculate the value of the seismic dynamic earth pressure and determine the position of the resultant force action point. The differences between the calculation methods for seismic active earth pressure in the above specifications are shown in Table 1.

Table 1

Comparison list of seismic active earth pressure calculation methods in various specifications

Specification name Considerations or assumptions
Code for highway engineering in China (JTG/T B02-01-2008, JTG B02-2013, JTG D30-2015, DB33T 988-2022) The cohesion of the fill and the uniformly distributed load on the top of the fill are considered, but the horizontal seismic coefficient is not considered
Code for seismic design of railway engineering (2009) (GB 50111-2006) The influence of earthquake action on the weight of the fill, the internal friction angle of the fill, and the friction angle between the wall and soil behind the wall is considered
Code for seismic design of urban bridges (CJJ166-2011) The seismic importance coefficient of the abutment is ignored, and the nature of the fill and the horizontal seismic coefficient are not considered
Code for design of highway reinforced earth engineering (JTJ 015-91) The structural importance of different highway grades, the type of reinforced earth structure, and whether the filling surface is an embankment slope are considered
Design manual for SRW (National Concrete Masonry Association, 2012) It is assumed that the horizontal and vertical accelerations are constant in the face slab, reinforced area, and backfill area. That is, the acceleration amplification effect of the structure is ignored
Japanese railway standards, 2012 The changes in the ground motion level and dynamic characteristics (peak strength and residual strength) of the fill are considered
French reinforced earth code (NF P 94-270, 2020) The influences of the top filling plane angle and the horizontal displacement of the panel are considered

To compare the practical application differences in seismic earth pressure calculation methods in the above specifications, a reinforced earth retaining wall structure with an overlying load is selected, and the calculation results of the seismic active earth pressure of the reinforced earth retaining wall under 0.1, 0.2, and 0.4g seismic peak accelerations are compared and analysed. The following conditions are assumed: (1) the back of the structural wall is vertical and smooth; (2) filling level is at the top of the reinforced earth retaining wall; (3) the project site is classified as class II site in Chinese specifications and class B site in European and American specifications; and (4) only horizontal seismic action is considered. The calculation diagram of the retaining wall is shown in Figure 3, and the structural design parameters are presented in Table 2.

Figure 3 
               Calculation schematic diagram of the reinforced soil retaining wall calculation example.
Figure 3

Calculation schematic diagram of the reinforced soil retaining wall calculation example.

Table 2

Structural design parameters for the reinforced soil retaining wall calculation example

Index Parameter value
Type of fill behind the wall Fine-gravel sand
Volume weight of the fill behind the wall γ (kN/m3) 16.9
Cohesion of fill behind the wall c (kPa) 0
Internal friction angle of the wall backfill φ (°) 42
Height of the wall H (m) 4
Overlying uniform load q (kPa) 20
Structural importance correction coefficient C i of highway grade 0.8
Comprehensive influence coefficient C Z of the structure type 0.35

According to the seismic earth pressure calculation methods in the above specifications, the distribution curves of the seismic active earth pressure along the wall height of the reinforced earth retaining wall shown in this case can be obtained under the peak ground acceleration of 0.1, 0.2, and 0.4g under various calculation methods (Figure 4). The figures show that the seismic active earth pressure of each specification is linearly distributed along the wall height. The seismic active earth pressure value at the top of the wall in the Chinese highway bridge standard (JTG/T B02-01-2008) and Japanese railway standard (2012) is not zero. The greater the peak ground acceleration, the greater the difference. The seismic active earth pressure value at the top of the wall is zero according to the United States NCMA code (2012), the code for seismic design of railway engineering (2009) (GB 50111-2006), the code for design of highway reinforced earth engineering (JTJ 015-91), the code for seismic design of urban bridges (CJJ166-2011), and the French reinforced earth code (NF p94-270,2020). Under a seismic peak acceleration of 0.1g, the calculation results of the seismic active earth pressure of each method from small to large are the United States NCMA code (2012), the code for seismic design of railway engineering (2009) (GB 50111-2006), the code for design of highway reinforced earth engineering (JTJ 015-91), the code for seismic design of urban bridges (CJJ166-2011), the French reinforced earth code (NF p94-270,2020), the Japanese railway standards (2012), and the guidelines for seismic design of highway bridges (JTG/T B02-01-2008). At seismic peak accelerations of 0.2 and 0.4g, the calculation result of the seismic active earth pressure of the United States NCMA specification (2012) is greater than that of the code for seismic design of railway engineering (2009) (GB 50111-2006), and the calculation result of Japanese railway standards (2012) is greater than that of the guidelines for seismic design of highway bridges (JTG/T B02-01-2008). With increasing seismic peak acceleration, the difference in the seismic active earth pressure at the bottom of the wall calculated by various codes increases.

Figure 4 
               Seismic active earth pressure distribution curve along the wall height. (a) Seismic peak acceleration 0.1g. (b) Seismic peak acceleration 0.2g. (c) Seismic peak acceleration 0.4g.
Figure 4

Seismic active earth pressure distribution curve along the wall height. (a) Seismic peak acceleration 0.1g. (b) Seismic peak acceleration 0.2g. (c) Seismic peak acceleration 0.4g.

According to the seismic active earth pressure calculation methods specified in the above codes, the seismic active earth pressure coefficient of the reinforced earth retaining wall shown in this case can be obtained under different peak ground accelerations. Then, based on the distribution curve of seismic active soil pressure along the wall height obtained from Figure 4, the magnitude and location of the resultant force of seismic active soil pressure under different peak accelerations can be plotted, as shown in Figure 5. The figures show that the seismic active earth pressure coefficients in the code for seismic design of urban bridges (CJJ166-2011) are the same under different seismic peak accelerations because the seismic active earth pressure coefficient calculation method in the code is related only to the internal friction angle of the fill, and the seismic active earth pressure coefficients obtained in other specifications increase with increasing ground motion acceleration. The seismic active earth pressure resultant force obtained in each code increases with increasing ground motion acceleration, and the calculation value in the guidelines for seismic design of highway bridges (JTG/T B02-01-2008) increases the fastest. The guidelines for seismic design of highway bridges (JTG/T B02-01-2008) and the Japanese railway standards (2012) both consider the additional load on the top when calculating the seismic earth pressure. Thus, the acting point of the seismic earth pressure resultant force is 0.37 of the wall height, which is higher than 1/3 of the wall height. The acting point of the seismic earth pressure resultant force calculated by other specifications is 1/3 of the wall height.

Figure 5 
               Relationship curve between the seismic active earth pressure resultant force and seismic motion during earthquakes. (a) Coefficient of seismic active earth pressure. (b) Resultant force of seismic active earth pressure. (c) Height of the resultant force action point.
Figure 5

Relationship curve between the seismic active earth pressure resultant force and seismic motion during earthquakes. (a) Coefficient of seismic active earth pressure. (b) Resultant force of seismic active earth pressure. (c) Height of the resultant force action point.

4 Discussion

For reinforced earth retaining walls, the reduction effect of reinforcement on the seismic active earth pressure at the back of the wall is not considered in all specifications. However, many studies on the earth pressure of reinforced retaining walls [12,30,31,32] have shown that friction reinforcement is a main factor that reduces the earth pressure at the back of the retaining wall. Therefore, in theory, the calculation method of the seismic active earth pressure in this work can be considered conservative when applied to reinforced earth retaining walls.

5 Conclusions

  1. The M-O method is essentially used in the calculation of seismic earth pressure in various codes. Conversely, the M-O formula is modified according to the assumption considered. However, the calculation idea and process of seismic earth pressure are basically the same.

  2. In the comparison of calculation examples of retaining wall structures, the difference in the seismic active earth pressure at the bottom of the wall, according to calculations by various codes, gradually increases with increasing seismic peak acceleration. The coefficient of seismic active earth pressure and the resultant force of seismic active earth pressure obtained from each code increase with increasing ground motion acceleration. The guidelines for seismic design of highway bridges (JTG/T B02-01-2008) and the Japanese railway standards (2012) consider the additional load on the top. Therefore, the acting point of seismic earth pressure resultant force is at 0.37H, which is higher than 1/3H, while those of the other codes are at 1/3H.

  3. In this work, only the theoretical calculations of various specifications are compared, but these results need to be further compared with large-scale model tests and specific seismic damage monitoring data from engineering projects. These comparisons will allow for the analysis of the applicability of the calculation methods of various specifications in specific engineering applications.

  1. Funding information: This research was funded by the Fundamental Research Funds for the Central Universities, grant number ZY20215120, and the Earthquake Technology Spark Program of China, grant number XH23067YA.

  2. Author contributions: Conceptualization, X.H. and X.C.; writing paper, Y.Q.; supervision, J.B.; resources, S.L. and Y.L. All authors have read and agreed to the published version of the manuscript.

  3. Conflict of interest: The authors declare no conflict of interest.

  4. Informed consent statement: All study participants provided informed consent.

  5. Data availability statement: Data openly available in a public repository.

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Received: 2025-03-18
Revised: 2025-06-03
Accepted: 2025-06-12
Published Online: 2025-10-15

© 2025 the author(s), published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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