考虑降水影响与分布开挖的基坑变形数值模拟

为了分析在降水影响下地铁车站基坑的稳定性和现场实测的精确性,建立了基坑体系二维有限元数值模拟.采用弹性模型考虑地基上的非线性性质,针对深基坑开挖过程引起的承载体系受力变形特性,分析了基坑降水和不降水两种情况引起的基坑变形,考虑了地下连续墙与周围土体的相互作用,包括地下连续墙变形、地表沉降及坑底回弹.结果表明,理论分析和实际监测结果较吻合,为工程的顺利实施提供了依据.

Numerical simulation on behavior of foundation pit deformation with considering dewatering and multi-stage excavation

To analyze the stability and field measurement accuracy of foundation pit of metro station under the effect of dewatering, the 2D finite element numerical simulation for the foundation pit system was performed. The nonlinear properties of foundation were considered with the constitutive model. Aiming at the mechanical deformation characteristics of force bearing system in the process of deep excavation, the deformation of foundation pit caused by dewatering and no dewatering was analyzed. In addition, the interaction between the underground continuous wall and soil, which mainly included the deformation of underground continuous wall, ground subsidence and bottom rebound, was considered. The results show that the theoretical analysis results are in agreement with the actual monitoring ones. The present study can provide the basis for the favoring execution of engineering construction.