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《Chinese Journal of Underground Space and Engineering》 2014-01
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Modeling of the Energy Release during the Shear Band Formation in the Circular Tunnel Surrounding Rock

Wang Xuebin;Wu Xiaolin;Pan Yishan;College of Mechanics and Engineering,Liaoning Technical University;  
The released energy in the failure process of a circular tunnel surrounding rock at different lateral pressure coefficients is modeled using FLAC. The emphasis is put on the formation of V-shaped notches and short shear bands. In the present calculation,the normal stresses are initialized in the model; a strain-softening constitutive relation is used; and a tunnel is excavated after the model is loaded to reach a static equilibrium state. Numerical results show that when the failed elements in shear are located at the tunnel surface or when they just extend toward the surrounding rock,the shear strain energy release rate is low,exhibiting pulse and oscillation characteristics. However,after the formation of short shear bands,the shear strain energy release rate exhibits rapidly increasing characteristics when they propagate toward the depth of the surrounding rock. The difference between the present model and the traditional axisymmetric thick-wall barrel model is discussed. In the present model,the shear stress is not initialized and it will exist after the model is loaded at its outer surfaces. Therefore,the model is not axisymmetric. The formation of V-shaped notches and short shear bands stems from the existence of the shear stress. As the lateral pressure coefficient increases,the peaks of the shear strain energy release rate rise; the phenomena of the released energy in shear and in tension become earlier; and the number of failed elements increases.
【Fund】: 国家自然科学基金项目(51374122);; 国家重点基础研究发展计划(2010CB226803);; 辽宁省煤矿液压技术与装备工程研究中心(辽宁工程技术大学)开放基金(CMHT-201205)
【CateGory Index】: TD322
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