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《Chinese Journal of Underground Space and Engineering》 2017-03
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Numerical Analysis on Damage Evolution and Time-dependent Failure of Rock Surrounding Underground Tunnel

Xing Meng;Li Lianchong;School of Civil Engineering,Dalian University of Technology;  
Based on the knowledge of long-term strength of rocks,time-dependent failure process of rock surrounding underground tunnel are simulated,by applying RFPA,in view of characteristics of rocks that physical and mechanical properties,strength and elasticity modulus etc.,are degraded and macroscopic damage accumulation with time due to the influence of environmental variation.Compared with the results of physical model test,timedependent deformation curves of roof,floor and walls from numerical simulation of tunnel were generally consistent with those from physical model test,and it was concluded that macroscopic failure of rock surrounding underground tunnel was a macroscopic damage consequence of time-dependent evolution and progressive accumulation.As a parameter analysis case,the impact of lateral pressure coefficient on time-dependent deformation and failure characteristics of tunnel was also simulated.The results show the wall-to-wall closure displacement of tunnel increases gradually with increase of lateral pressure coefficient,while roof-to-floor convergence displacement decreases gradually.Local macroscopic damage evolution and macroscopical time-dependent failure of tunnel surrounding rock also are explained.
【Fund】: 安徽省科技计划项目(1604a0802109);; 国家重点基础研究计划973项目(2014CB047103);; 国家自然科学基金资助项目(51279024)
【CateGory Index】: U451.2
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