Numerical Investigation on Deformational Behavior and Creep Failure of Roadways in Soft Rocks
In view of the nature of the horizontal tunnels located in deep soft strata, the numerical code, Rock Failure Process Analysis (RFPA2D) was employed to investigate the closure, damage and failure behavior of the horizontal tunnels. In terms of material degradation, a series of numerical simulations were performed to study the wall-to-wall closure, roof-to-floor convergence and subsequent failure in tunnels. The numerical results provide a complete illumination for the closure, damage and failure behavior with different loading conditions. It is shown that the depth and the ratio of far field stresses play an important role in the fracture behavior of tunnels. Rheological failure of tunnels is influenced not only by the rock characteristic around the tunnels but also by the orientation and distribution of far field stress on a global scale. Maybe, immoderate stress distribution resulted in a higher post-influence closure rate for both wall-to-wall closure and roof-to-floor convergence.
horizontal tunnels material degradation numerical simulation creep closure
LI Lianchong TANG Chunan LIANG Zhengzhao XU Tao ZHAI Xinxian
School of civil and hydraulic engineering, Dalian University of Technology, Dalian 116024, China
国际会议
The 2007 International Symposium on Safety Science and Technology(2007采矿科学与安全技术国际学术会议)
河南焦作
英文
373-378
2007-04-17（万方平台首次上网日期，不代表论文的发表时间）