Spatial distribution of excavation induced damage zone of high rock slope

Abstract The excavation induced damage zone (EDZ) can significantly influence the overall performance of an excavated slope. Determining the spatial distribution characteristics of the EDZ is very important to both design and construction of high rock slope. Based on the case study of the excavation of high rock slope at the Xiluodu Hydropower Station in Sichuan province of China, spatial distributions of EDZ of the slope surface and berm were determined using sonic logging and cross-hole sonic tests. The results showed that the vertical damage depth increases non-linearly from the inner side to the outer flank of the berm, whereas the horizontal damage scope increases non-linearly from the bottom to the top of the slope. The maximum horizontal damage scope and the maximum vertical damage depth are found to be at the outer flank of the berm. To reproduce and predict the EDZ for high rock slope excavation with Dynamic Finite Element Method, a modified tensile–compressive damage model was introduced into the simulation of the EDZ of Xiluodu high rock slope. Four other frequently used damage models were used as comparisons. The results demonstrate that the damage zone obtained by the modified tensile–compressive damage model agreed with observations better than the other four existing blasting damage models.

[1]  Guowei Ma,et al.  Numerical simulation of blasting-induced rock fractures , 2008 .

[2]  David Saiang,et al.  The excavation disturbed zone (EDZ) at Kiirunavaara mine, Sweden—by seismic measurements , 2007 .

[3]  Byung-Sik Chun,et al.  Cross-hole seismic technique for assessing in situ rock mass conditions around a tunnel , 2012 .

[4]  J. R. Furlong,et al.  Modeling the Dynamic Load/Unload Behavior of Ceramics under Impact Loading , 1990 .

[5]  C. Tang,et al.  Numerical simulation of progressive rock failure and associated seismicity , 1997 .

[6]  L. Jing,et al.  Characterising and modelling the excavation damaged zone in crystalline rock in the context of radioactive waste disposal , 2009 .

[7]  L. M. Taylor,et al.  Microcrack-induced damage accumulation in brittle rock under dynamic loading , 1986 .

[8]  Richard E. Goodman,et al.  BEHAVIOR OF ROCK IN SLOPES , 2000 .

[9]  P. J. Hommert,et al.  Experimental and computational investigation of the fundamental mechanisms of cratering , 1990 .

[10]  Hong Hao,et al.  Numerical Analysis of Blast-Induced Stress Waves in a Rock Mass with Anisotropic Continuum Damage Models Part 1: Equivalent Material Property Approach , 2002 .

[11]  W. F. Bawden,et al.  A new constitutive model for blast damage , 1996 .

[12]  Heping Xie,et al.  Numerical investigation of blasting-induced damage in cylindrical rocks , 2008 .

[13]  R. F. Shen,et al.  Numerical simulation of tensile damage and blast crater in brittle rock due to underground explosion , 2007 .

[14]  Rafael Jimenez,et al.  A new open-pit mine slope instability index defined using the improved rock engineering systems approach , 2013 .

[15]  Zhi-liang Wang,et al.  Numerical study on craters and penetration of concrete slab by ogive-nose steel projectile , 2007 .

[16]  R. S. Read,et al.  20 years of excavation response studies at AECL's Underground Research Laboratory , 2004 .

[17]  Jianhua Yang,et al.  An equivalent method for blasting vibration simulation , 2011, Simul. Model. Pract. Theory.

[18]  Hong Zhou,et al.  Evaluation of excavation‐induced relaxation and its application to an arch dam foundation , 2012 .

[19]  P. D. Katsabanis,et al.  DEVELOPMENT OF A CONTINUUM DAMAGE MODEL FOR BLASTING ANALYSIS , 1997 .

[20]  Sanjay Govindjee,et al.  Anisotropic modelling and numerical simulation of brittle damage in concrete , 1995 .

[21]  Qian Sheng,et al.  Estimating the excavation disturbed zone in the permanent shiplock slopes of the Three Gorges Project, China , 2002 .

[22]  M. E. Kipp,et al.  Continuum modelling of explosive fracture in oil shale , 1980 .

[23]  S. Kwon,et al.  An investigation of the excavation damaged zone at the KAERI underground research tunnel , 2009 .

[24]  Peng Yan,et al.  Dynamic response of rock mass induced by the transient release of in-situ stress , 2012 .

[25]  N. Chandler,et al.  Excavation-induced damage studies at the Underground Research Laboratory , 2004 .

[26]  Li Haibo,et al.  Rock damage control in bedrock blasting excavation for a nuclear power plant , 2011 .