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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 ,多种工况的有限元分析得到了一些合理的结果
The nonlinear finite element analysis of several working conditions of tunnel excavation and water storage in the No.7 tunnel of the Shanxi Wanjiazhai Yellow River diversion project was carried out.The main contents include the initial simulation of the aeolian loess layer by the hierarchical filling process The stress field was calculated by Duncan release load theory and elastic theory of surface force formula. The Goodman joint element was used to simulate the joint of the lining segment. The Terzaghi loosening earth pressure theory was used to apply the pressure on the segment. The Duncan Chang model Parameters were taken unloaded and loaded test of undisturbed soil, and the results of finite element analysis of the model parameters obtained by the two kinds of tests were compared. Finite element analysis of various working conditions obtained some reasonable results