Study on crack initiation and propagation in rock mass during unloading based on XFEM

DENG Qing-lin; ZHAO Guo-yan; TAN Biao; ZOU Yu-liang; LI Xi-bing

doi:10.13374/j.issn2095-9389.2017.10.002

Volume 39 Issue 10

Oct. 2017

Turn off MathJax

Article Contents

Article Navigation > Chinese Journal of Engineering > 2017 > 39(10): 1470-1476

DENG Qing-lin, ZHAO Guo-yan, TAN Biao, ZOU Yu-liang, LI Xi-bing. Study on crack initiation and propagation in rock mass during unloading based on XFEM[J]. Chinese Journal of Engineering, 2017, 39(10): 1470-1476. doi: 10.13374/j.issn2095-9389.2017.10.002

Citation:

DENG Qing-lin, ZHAO Guo-yan, TAN Biao, ZOU Yu-liang, LI Xi-bing. Study on crack initiation and propagation in rock mass during unloading based on XFEM[J]. Chinese Journal of Engineering, 2017, 39(10): 1470-1476. doi: 10.13374/j.issn2095-9389.2017.10.002

Citation:

PDF( 5007 KB)

Study on crack initiation and propagation in rock mass during unloading based on XFEM

doi: 10.13374/j.issn2095-9389.2017.10.002

1) Southwest Geotechnical & Design Institute of China Nuclear Industry Co. Ltd., Chengdu 610061, China
2) School of Resources and Safety Engineering, Central South University, Changsha 410083, China
3) School of Civil Engineering, Tongji University, Shanghai 200092, China

Received Date: 2016-11-02

Abstract

Abstract

Rock-mass unloading often occurs during underground and slope engineering excavations. Here, rock-mass crack initiation and propagation during the excavation unloading progress was simulated using the extended finite element method (XFEM) in ABAQUS. Crack propagation and its influencing factors were studied and discussed after calculating the stress intensity factors at the crack tips, and by recording the crack's shape a dynamic evolution model was produced. The results show that the faster the unloading rate,the longer the crack,and the greater the crack dip angle, the easier the crack initiates. The normal stress on a crack surface decreases while shear stress increases during unloading, and that crack propagation is mainly controlled by shear stress. This is consistent with the theoretical analysis. The final shape of the modeled crack was also close to the result of the physical experiments, indicating the reliability of this study.
- rock-mass unloading,
- crack,
- initiation and propagation,
- extended finite element method

FullText(HTML)

References(7)

References

[4]	Li Q Y, Dong L J, Li X B, et al. Effects of sonic speed on location accuracy of acoustic emission source in rocks. Trans Nonferrous Met Soc China, 2011, 21(12):2719
[7]	Zhuang X Y, Chun J W, Zhu H H. A comparative study on unfilled and filled crack propagation for rock-like brittle material. Theor Appl Fract Mech, 2014, 72:110
[8]	Yu T T. The extended finite element method (XFEM) for discontinuous rock masses. Eng Computation, 2011, 28(3):340
[9]	Deb D, Das K C. Extended finite element method for the analysis of discontinuities in rock masses. Geotech Geol Eng, 2010, 28(5):643
[10]	Belytschko T, Black T. Elastic crack growth in finite elements with minimal remeshing. Int J Num Method Eng, 1999, 45(5):601
[11]	Moes N, Dolbow J, Belytschko T. A finite element method for crack growth without remeshing. Int J Num Method Eng, 1999, 46(1):131
[15]	Ayhan A O. Mixed mode stress intensity factors for deflected and inclined corner cracks in finite-thickness plates. Int J Fatigue, 2007, 29(2):305