【摘要】 针对山西省万家寨引黄入晋工程总干线7#隧洞的开挖和蓄水运行的几种工况进行了非线性有限元分析。内容主要有:采用分级堆填过程模拟初始地应力场;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接缝;对土样进行卸荷试验确定Duncan-Chang模型参数,并与加荷试验成果比较;应用太沙基松动土压力理论施加管片压力等。多工况的分析得到一些合理的结果。更多还原

【Abstract】 A nonlinear stress and strain analysis of tunneling and working condition of No. 7 tunnel of Wanjiazhai water transmission project in Shanxi Province is conducted. The initial stress field is simulated by grading landfill,and the theory of unloading proposed by Duncan and boundary stress of elasticity were used to simulate excavation of the tunnel. Goodman joint elements are utilized to simulate the joints of liners. Both loading and unloading tests are conducted for determination of parameters of Duncan-Chang抯 model. The loading on the pipes is evaluated according to Terzaghi抯 theory on loosening earth pressure. Several working cases are analyzed and some reasonable results are obtained.更多还原