摘要
This paper is devoted to the nonlinear stress and strain analysis oftunneling and working conditions of Wanjiazhai Division Project No.7 Tunnel in Shanxi province ofChina. The initial geological stress of loess was simulated by grading fill; the theory of unloadingproposed by Duncan and boundary stress of elasticity were used to calculate the excavation of thetunnel; Goodman joint elements were applied to simulate the joints of the liners; both loading andunloading tests have been performed to determine the parameters of Duncan-Chang's model and thecalculated results were compared; Terzaghi' s theory on loosening earth pressure was applied. Manyworking conditions were analyzed and some reasonable results were obtained. Based on the analyses,reparative measures were proposed and completed. The tunnel has functioned well since October, 2001.
对山西省万家寨引黄入晋工程总干线 7号隧洞开挖和蓄水运行的几种工况进行了非线性有限元分析 .主要内容包括采用分级堆填过程模拟风积黄土层的初始应力场 ;应用Duncan释放荷载思想和弹性理论面力公式进行开挖卸荷计算 ;采用Goodman节理单元模拟衬砌管片的接缝 ;应用Terzaghi松动土压力理论施加管片上压力 ;确定土的Duncan Chang模型参数时 ,分别取原状土进行了卸载和加载试验 ,并比较了用 2种试验获得的模型参数进行有限元变形分析的结果 。
