"半顺作半逆作法"基坑开挖中地下连续墙有限元分析

对于超大型深基坑开挖和地下结构工程,采用半逆作法施工是比较经济而有效的.但"半逆作法"基坑开挖施工是一个复杂的系统问题,为了检验设计计算的可行性和掌握支护结构力学响应的发展特点,有必要对基坑开挖进行数值模拟预测.结合某大型深基坑工程,根据基坑开挖施工的特点,借助于大型分析软件ANSYS建立数值计算模型,对基坑开挖施工过程中地下连续墙进行动态数值模拟预测.通过对模拟结果与实测数据的分析比较,表明所用方法能有效地反映地下连续墙在基坑开挖过程中的变形与应力情况.

Finite Element Analysis on the Diaphragm in Excavating Process of a Large Deep Pit with Semi-Reversed Construction Method

In the design and construction of super foundation pits, the semi - reversed construction method is economical and effective. But the excavating process by the semi -reversed construction method is a complex system project. In order to check up the design and to find out the development property of the mechanical response in the supporting structure, the numerical simulation is necessary. Combined with a large deep pit engineering, a 3D finite element analysis model was established to simulate numerically the process of excavation work in this paper. The calculated results are compared with the monitored data. It is shown that the method used in this paper can reveal the deformation and the stress of the concrete diaphraghm wall quite well.