Fracture behavior of an empty hole using the digital laser dynamic caustic method under directional controlled blasting

Dongming Guo; Kang Liu; Hui Lu; Renshu Yang; Chunlai Wang; Yanbing Wang

doi:10.3139/120.110950

Article

Fracture behavior of an empty hole using the digital laser dynamic caustic method under directional controlled blasting

Dongming Guo , Kang Liu , Hui Lu , Renshu Yang , Chunlai Wang and Yanbing Wang

Published/Copyright: December 15, 2016

Published by

Become an author with De Gruyter Brill

Submit Manuscript Author Information

From the journal Materials Testing Volume 58 Issue 11-12

Abstract

A systematic approach for using a new digital laser dynamic caustic (DLDC) method to provide useful insights for blasting crack propagation is illustrated. Under blast loading conditions, the dynamic behavior of blasting crack propagation and stress distribution around the empty hole between two boreholes were investigated. The results show that the crack tips were gradually deflected towards the empty hole. Then, it was eventually perforated under the guiding role of empty holes. By the interaction between the blast stress waves and the empty hole, the reflected tensile waves were generated. Moreover, these waves changed the stress field and reduced the velocity of the crack tip with a greater diameter for the empty hole. It was also found that the size of the empty holes had a slight influence on the direction of the principal stress. The larger the size of the empty hole was, the smaller was the speed of the crack propagation. In general, the crack propagation velocity of the circular empty hole was the highest, followed by that of the square hole and the notched circular hole. As the blast crack extended to the vicinity of the empty hole, the stress intensity factor of the crack tip started to show an upward trend again.

Kurzfassung

In dem vorliegenden Beitrag wird ein systematischer Ansatz zur Nutzung eines neuen digitalen laserdynamischen Ätzverfahrens (Digital Laser Dynamic Caustic (DLDC)) vorgestellt, um nützliche Einsichten in den Rissfortschritt bei Sprengungen zu bekommen. Unter den Bedingungen der Sprengbeanspruchung wurde das dynamische Verhalten des Sprengrissfortschrittes und der Spannungsverteilung um ein leeres Loch zwischen zwei Bohrlöchern untersucht. Die Ergebnisse zeigen, dass die Rissspitzen graduell in Richtung des leeren Loches abgelenkt wurden. Danach wurde es schließlich entsprechend dem Gesetz für leere Löcher perforiert. Unter der Wechselwirkung zwischen den Sprengspannungswellen und dem leeren Loch wurden die reflektierten Wellen in Zugrichtung erzeugt. Darüber hinaus veränderten diese Wellen das Spannungsfeld und reduzierten die Geschwindigkeit der Rissspitze mit einem größeren Durchmesser des leeren Loches. Es stellte sich außerdem heraus, dass die Größe der leeren Löcher einen leichten Einfluss auf die Richtung der Hauptspannungen hatte. Je größer die Abmessung des leeren Loches war, desto geringer war die Rissfortschrittsgeschwindigkeit. Allgemein war die Rissfortschrittsgeschwindigkeit für das kreisrunde leere Loch am größten, gefolgt von der für ein rechteckiges Loch und der für ein gekerbtes kreisrundes Loch. Als der Sprengriss sich in die Umgebung des leeren Loches ausdehnte, begann der Spannungsintensitätsfaktor der Rissspitze wieder einen Aufwärtstrend zu zeigen.

*Correspondence Address, Assoc. Prof. Chunlai Wang, Faculty of Resources and Safety Engineering, China University of Mining & Technology Beijing, Ding 11, Xueyuan Road, Haidian District, Beijing, 100083, P. R. China, E-mail: tswcl@126.com

Dongming Guo, born in 1974, works as Professor in the Faculty of Mechanics and Architecture Engineering, China University of Mining & Technology, Beijing, China. He obtained his Geotechnical Engineering Doctor degree in 2010. He has studied rock mechanics and rock engineering for many years.

Kang Liu, born in 1988, is a postgraduate at China University of Mining & Technology, Beijing, China. His research interests mainly focus on rock mechanics and engineering blasting.

Hui Lu, born in 1990, is a postgraduate at China University of Mining & Technology, Beijing, China. He obtained his Bachelor degree at Henan Polytechnic University, China in 2013. His research interests mainly focus on the development of nondestructive materials testing technology and acoustic emission testing.

Renshu Yang, born in 1963, ha a Geotechnical Engineering Doctor degree and works as Professor in the Faculty of Mechanics and Architecture Engineering, China University of Mining & Technology in Beijing. He has studied mine construction, geotechnical engineering and engineering blasting.

Chunlai Wang, born in 1976, works as Associate Professor in the Faculty of Resources and Safety Engineering, China University of Mining & Technology in Beijing. He has studied control of mine dynamic disasters and early warning technology for many years.

Yanbing Wang, born in 1987, received his Civil Engineering degree from China University of Mining & Technology, Beijing, in 2015. His research interests mainly focus on the engineering blasting and roadway support.

References

1 U.Langefors, B.Kihlström: The Modern Technique of Rock Blasting, Wiley, Hoboken, USA (1978)Search in Google Scholar

2 Y. P.Liu, Z. Y.Zhou, J. H.Li: Theoretical and experimental study on empty hole effect in tunnel cut blasting, Metal Mine368 (2007), No. 2, pp. 12–14 (in Chinese)Search in Google Scholar

3 J. W.Dally: An introduction to dynamic photoelasticity, Experimental Mechanics20 (1980), No. 12, pp. 409–41610.1007/BF02320881Search in Google Scholar

4 B.Mohanty: Explosion generated fractures in rock and rock-like materials, Engineering Fracture Mechanics35 (1990), No. 4, pp. 889–89810.1016/0013-7944(90)90173-ESearch in Google Scholar

5 K.Nakagawa, T.Sakamoto, R.Yoshikai: Model study of the guide hole effect on the smooth blasting, Journal Japan Explosives Society43 (1982), pp. 75–82Search in Google Scholar

6 R. S.Yang, Y. L.Che, X.Tong, Y. L.Mi, L.Feng: Experimental study on the Technology of middle empty hole in parallel hole cut blasting, Advanced Materials Research594 (2012), pp. 1314–131710.4028/www.scientific.net/AMR.594-597.1314Search in Google Scholar

7 Y.Nakamura: Model experiments on effectiveness of fracture plane control methods in blasting, Fragblast3 (1999), No. 1, pp. 59–7810.1080/13855149909408034Search in Google Scholar

8 O.Uysal, K.Erarslan, M. A.Cebi, H.Akcakoca: Effect of barrier holes on blast induced vibration, International Journal of Rock Mechanics and Mining Sciences45 (2008), No. 5, pp. 712–71910.1016/j.ijrmms.2007.08.008Search in Google Scholar

9 S. H.Cho, Y.Nakamura, B.Mohanty, H. S.Yang, K.Kaneko: Numerical study of fracture plane control in laboratory-scale blasting, Engineering Fracture Mechanics75 (2008), No. 13, pp. 3966–398410.1016/j.engfracmech.2008.02.007Search in Google Scholar

10 K. F.Bian, H. B.Li, Y. Q.Liu: Numerical simulation for the damping effect of empty holes on blasting vibration, Advanced Materials Research936 (2014), pp. 1490–149510.4028/www.scientific.net/AMR.936.1490Search in Google Scholar

11 T.Wen, H.Tan: The empty hole effect numerical computation analysis during rock blasting, Blasting28 (2011), No. 3, pp. 58–61 (in Chinese)Search in Google Scholar

12 J. F.Kalthoff, S.Winkler, J.Beinert: Dynamic stress intensity factors for arresting cracks in DCB specimens, International Journal of Fracture12 (1976), No. 2, pp. 317–31910.1007/BF00036990Search in Google Scholar

13 P. S.Theocaris: Dynamic propagation and arrest measurements by the method of caustics on overlapping skew-parallel cracks, International Journal of Solids and Structures14 (1978), No. 8, pp. 639–65310.1016/0020-7683(78)90003-3Search in Google Scholar

14 Z. W.Yue, L. Y.Yang, Y. B.Wang: Experimental study of crack propagation in polymethyl methacrylate material with double holes under the directional controlled blasting, Fatigue and Fracture of Engineering Materials and Structures36 (2013), No. 8, pp. 827–83310.1111/ffe.12049Search in Google Scholar

15 A.Yazdanmehr, N.Soltani: Evaluation of stress intensity factors of rounded V and U notches under mixed mode loading using the experimental method of caustics, Theoretical and Applied Fracture Mechanics74 (2014), No. 12, pp. 79–8510.1016/j.tafmec.2014.07.011Search in Google Scholar

16 C.Tang: Experimental investigation of the fiber bundle shielding effect on the dynamic matrix crack using optical caustic method, Polymer Testing40 (2014), pp. 46–5310.1016/j.polymertesting.2014.08.011Search in Google Scholar

17 G.Gao, Z.Li, M.Negahban: Dynamic fracture analysis of aged glassy polycarbonate by the method of caustics, Acta Mechanica Solida Sinica26 (2013), No. 5, pp. 448–45710.1016/S0894-9166(13)60040-3Search in Google Scholar

18 K.Arakawa, T.Mada: Unsteady dynamic crack propagation in a brittle polymer, Experimental Mechanics47 (2007), No. 5, pp. 609–61510.1007/s11340-006-9020-xSearch in Google Scholar

19 X. F.Yao, H. Y.Yeh, H. P.Zhao: Dynamic response and fracture characterization of polymer-clay nanocomposites with mode-I crack, Journal of Composite Materials39 (2005), No. 16, pp. 1487–149610.1177/0021998305050437Search in Google Scholar

20 X. F.Yao, J.Fang, C. Y.Xiong: Dynamic caustics analysis of crack and hole under the explosive stress waves, Explosion and Shock Waves18 (1998), No. 3, pp. 231–236 (in Chinese)Search in Google Scholar

21 Y.Nakamura, S.Iwamoto, T.Ohhara, J.Mukugi: Model experiments on the effectiveness of guide holes with notches for blast crack control, Journal Japan Explosives Society58 (1997), pp. 131–137Search in Google Scholar

22 Z. W.Yue, R. S.Yang, D. M.Guo: Model experimental of stress field around empty hole under blasting loading, Journal of China Coal Society34 (2009), No. 5, pp. 624–628 (in Chinese) 10.13225/j.cnki.jccs.2009.05.026Search in Google Scholar

23 R. S.Yang, L. B.Gui: Caustics Method and its Application, China University of Mining and Technology Press, Xuzhou, China (1997) (in Chinese)Search in Google Scholar

24 X. F.Yao, W.Xu: Recent application of caustics on experimental dynamic fracture studies, Fatigue and Fracture of Engineering Materials and Structures34 (2011), No. 6, pp. 448–45910.1111/j.1460-2695.2010.01539.xSearch in Google Scholar

25 G. A.Papadopoulos: Fracture Mechanics, The Experimental Method of Caustics and the Determination Criterion of Fracture, Springer-Verlag, Berlin, London, UK (1993) 10.1007/978-1-4471-1992-0Search in Google Scholar

26 K.Takahashi, K.Arakawa: Dependence of crack acceleration on the dynamic stress- intensity factor in polymers, Experimental Mechanics27 (1987), No. 2, pp. 195–19910.1007/BF02319474Search in Google Scholar

27 R. S.Yang, Y. B.Wang, H. J.Xue, M. Y.Wang: Dynamic behavior analysis of perforated crack propagation in two-hole blasting, Procedia Earth and Planetary Science4 (2012), No. 5, pp. 254–26110.1016/j.proeps.2012.01.044Search in Google Scholar

28 H. K.Kutter, C.Fairhurst: On the fracture process in blasting, International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts8 (1971), No. 3, pp. 181–20210.1016/0148-9062(71)90018-0Search in Google Scholar

29 H. P.Rossmanith, A.Daehnke, R. E. K.Nasmillner, N.Kouzniak, M.Ohtsu, K.Uenishi: Fracture mechanics applications to drilling and blasting, Fatigue and Fracture of Engineering Materials and Structures20 (1997), No. 11, pp. 1617–163610.1111/j.1460-2695.1997.tb01515.xSearch in Google Scholar

Published Online: 2016-12-15

Published in Print: 2016-11-16

You are currently not able to access this content.

Articles in the same Issue

https://doi.org/10.3139/120.110950