软土地区临近隧道的深大基坑变形控制方法

The deformation control method of deep excavation adjacent to tunnels in soft soil area

采用有限元软件对上海市临近已建地铁10号线的吴中路项目基坑开挖进行二维数值模拟,主要分析计算了地下连续墙最大侧向位移及隧道变形,并对地下连续墙最大侧向位移及隧道变形监测值进行了研究。监测结果与数值模拟结果对比分析表明,二维数值模拟分析模型可以较好地给出地下连续墙最大侧向位移及隧道变形规律;从基坑围护设计角度出发,通过数值模拟进一步分析了地下连续墙的插入比、被动区加固宽度对地连墙及隧道变形的影响,对于类似工程的基坑支护设计有一定的参考意义。

The two-dimension numerical simulation was carried out for deep excavation of Wuzhong Road project which is adjacent to Shanghai metro line 10. The maximum lateral displacement and tunnel deformation of underground diaphragm wall were analyzed,and the simulation results were compared with monitoring values. The comparation results of monitoring and simulation show that,the two-dimension numerical model could accurately calculate the maximum lateral displacement and tunnel deformation of underground diaphragm wall. Considering the foundation pit retaining design,the numerical model was used to analyze the influence of insertion ratio and reinforcement width of passive area. The analyzed results could be used as significant reference for similar projects of foundation pits.