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《Mining Research and Development》 2009-06
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Analysis on Failure Process of Surrounding Rock of Roadway or Tunnel in High Stress Area

Zhang Xiaojun1,2,Jing Hongwen1 ( 1. School of Architecture and Civil Engineering,China University of Mining & Technology,Xuzhou,Jiangsu 221008,China; 2. School of Resources and Environment Engineering,Shandong University of Technology, Zibo,Shandong 255049,China)  
The numerical simulation of failure evolution processes of surrounding rock of roadways or tunnel in high stress area under three conditions of surrounding rock were carried out by using a rock failure process analysis code ( RFPA) ,and the results of numerical simulation were analyzed. The results of numerical simulation indicated that the characteristic of surround- ing rock has great influence on its failure process,the failure process of surrounding rock of roadway under unloading condition develops gradually with time; for more homogeneous and homoge- neous rock,the damage process of surrounding rock appears a slow transformation or does not change in a long phases at first, then enter into a transitorily accelerated failure process and mac-roscopic failure phase,obviously exhibits brittle fracture; for inhomogeneous rock,the damage process of surrounding rock appears a progressive transformation in a longer phase,accelerated failure process is not obvious. Considering the impact of excavating disturbance on the surrounding rock,with the increasing of the radius of surrounding rock,roadway was simulated based on the different conditions of surrounding rock with different strength parameters and different homogeneity,simulated results were is in agreement with practical situation.
【Fund】: 国家自然科学基金资助项目(50674083);; 山东省自然科学基金项目(Y2008F51)
【CateGory Index】: TD32
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