【摘要】 针对跨越运营地铁隧道的超大面积深基坑建立了大型三维有限元模型,并对基坑开挖引起的周边环境和隧道变形进行分析.根据工程的重要性和信息化施工的需要,利用施工过程的变形监测数据,使用单纯形法对其土体参数进行了反分析.根据编制的单纯形反分析程序和有限元方法计算得到了相关的土体参数,并预测了基坑开挖最终引起的隧道隆起量.结果表明,计算所得隧道隆起预测结果与实际监测数据较为接近.更多还原

【Abstract】 The three dimensional finite element model was built up to simulate an over size and deep excavation traversing shield tunnels,and the effects on surroundings and tunnel heave due to excavation were analyzed.From monitored retaining wall horizontal displacements and tunnel heave,a simplex method was employed for back-analysis of soil parameters.According to the back-analysis program based on simplex method,optimized soil parameters were attained after finite element analysis.The final tunnel heave was predicted by the optimized soil parameters.The results show that the predicted tunnel heave is close to monitored data,which guarantees the effectiveness of back analysis by this paper.更多还原