Numerical Analysis of Tunnel Stability Influenced by Temperature
High temperature results in the change of thermal, mechanical and physical properties of rock and rock reinforcement, especially the heat induced failure which influenced tunnel stability. The purpose of this paper is to investigate how serious of the temperature effect on the stability of tunnels. A numerical model named RFPA-Thermal code was employed to simulate the tunnel failure process at the temperature elevation. The proposed numerical model can be used not only to produce fracturing patterns similar to those reported in previous studies, but also to predict fracturing patterns under a variety of loading conditions. Numerical results show that temperature gradient generates compressive stress due to thermal expansion near the surface exposed to fire of the tunnel at the beginning of heating. It turns to tensile stress at the sidewall of tunnel because of failure occurred in this area, and heating of tunnel usually causes spalling on its surface. It is violent failure when the tunnel is exposed to the high or quickly increasing temperatures. The simulation results are well reappearance the spalling on the sidewall of tunnel.
numerical analysis tunnel stability failure process thermal stress
TANG Shibin TANG Chunan YU Qinglei Zhang Zhe Xu Suchao
School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian, 116024, China Center for Rock Instability and Seismicity Research, Northeastern University, Shenyang 110004, 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
661-666
2007-04-17（万方平台首次上网日期，不代表论文的发表时间）