地铁车站明挖施工深基坑监控量测及数值模拟研究

Monitoring and Numerical Simulation Research on the Deep Foundation Excavation in Open-cut Construction of Subway Station

通过建立地下连续墙、内支撑和土层三维整体有限元模型,对深基坑开挖每步施工过程进行数值模拟分析。探讨深基坑随着施工推进土层的变形情况、内支撑的应力分布情况,进而判断深基坑在整个施工过程中的稳定性和安全性。同时还对深基坑开挖过程中对毗邻建筑物的地面变形和基坑支护应力进行了监测,并与数值模拟结果进行了对比。结果表明,理论计算结果和现场监测数据的变化规律基本一致,在深基坑施工过程中要重点控制由于开挖引起的地面过大变形和监控支护结构的内力。

The whole model of three-dimensional finite element is established through the diaphragm wall, inner supporting and soil layer. The numerical simulation of deep foundation excavation under the construction process is carried through. The deformation of soil in the deep foundation excavation with the construction process and stress distribution in the inner supporting are discussed. Then the stability and safety of deep foundation excavation in the whole construction process is judged. At the same time, the ground deformation on adjacent buildings and foundation excavation support stress is monitored in the deep foundation excavation, and the results are compared with the numerical simulation. The results show that the theoretical calculation results and monitoring data are basically the same. The ground deformation should be controlled and the internal force of support structure is monitored in the construction process of deep foundation excavation.