Numerical Simulation of Rock Burst in Circular Tunnels Under Unloading Conditions

被引：5

作者：

SUN, Jin-shan ^{[1
]}

ZHU, Qi-hu ^{[1
]}

LU, Wen-bo ^{[1
]}

机构：

[1] State Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan

来源：

Journal of China University of Mining and Technology | 2007年 / 17卷 / 04期

基金：

中国国家自然科学基金;

关键词：

circular tunnel; DDA; numerical simulation; RFPA; rock burst; TU; 45; unloading;

D O I：

10.1016/S1006-1266(07)60144-8

中图分类号：

学科分类号：

摘要：

Rock burst in a circular tunnel under high in-situ stress conditions was investigated with a numerical method coupled the rock failure process theory (RFPA) and discontinuous deformation theory (DDA). Some numerical tests were carraied out to investigate the failuer patterns of circular tunnel under unloading conditions. Compared the results under loading conditions, the shapes of failure zones are more regular under the unloading conditions. The failure patterns in the same type of rock mass are clearly different because of non-homogeneity of the rock material. The extension of cracks shows some predictability with an increasing of in-situ stress. When the homogeneity index of rocks (m) is either relatively high or low and lateral pressure coefficients (λ) is high, the number of regular shear slide cracks decreases and the probability of a rock burst also becomes lower. Our numerical simulation results show that the stability of surface rock and the natural bedding stratification of rock material greatly affect rock bursts. Installing bolts with due diligence and suitably can effectively prevent rock bursts. However, it is not effective to control rock bursts by releasing the strain energy with normal pre-boreholes. © 2007 The Journal of China University of Mining & Technology.

引用

页码：552 / 556

页数：4

共 10 条

[1] Tan Y., Analysis of fractured face of rockburst with scanning electron microscope and its progressive failure process, Journal of Chinese Electron Microscopy, 21, 2, pp. 41-48, (1989)
[2] Miao X., An L., Zhai M., Et al., Model of rockburst for extension of slip fracture in palisades, Journal of China University of Mining & Technology, 28, 2, pp. 113-117, (1999)
[3] Xu D., Zhang G., Li T., On the stress state in rock burst, Chinese Journal of Rock Mechanics and Engineering, 19, 2, pp. 169-172, (2000)
[4] Tang C., Kaiser P., Numerical simulation of cumulative damage and seismic energy release during brittle rock failure-Part I: fundamentals, International Journal of Rock Mechanics and Mining Sciences, 35, 2, pp. 113-121, (1998)
[5] Shi G., Numerical Analysis Methods and Discontinuous Deformation Analysis, (1997)
[6] Fakhimia F., Carvalhoc T., Ishidad J., Simulation of failure around a circular opening in rock, International Journal of Rock Mechanics & Mining Sciences, 39, pp. 507-515, (2002)
[7] Zhu W., Liu J., Tang C., Et al., Simulation of progressive fracturing processes around underground excavations under biaxial compression, Tunneling and Underground Space Technology, 20, pp. 231-247, (2005)
[8] Huang R., Wang X., Chan L., Triaxial unloading test of rocks and its implication for rock burst, Bull Eng Geol Env, 60, pp. 37-417, (2001)
[9] Sahouryeh E., Dyskin A., Germanovich L., Crack growth under biaxial compression, Engineering Fracture Mechanics, 69, pp. 2187-2198, (2002)
[10] William D., The behavior of tunnels at great depth under large static and dynamic pressures, Tunneling and Underground Space Technology, 16, pp. 41-48, (2001)

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