合肥恒大中心深基坑土方开挖模拟优化

Simulation and Optimization of Deep Foundation Pit Soil Excavation on Evergrande Center in Hefei

有限元分析方法已成为模拟基坑开挖的常用手段,但对于很多大型基坑来讲,由于其规模较大,开挖工程量大,对其建立三维仿真模型进行的研究相对较少。合肥恒大中心深基坑工程开挖面积大,周围环境复杂,针对土方开挖过程优化,提出3种可行的土方开挖方案,并对其分别建立三维仿真模型进行数值模拟分析,分别从桩体深层水平位移、桩顶(坡顶)水平位移、基坑周边地表沉降、锚索轴力等4个方面来对比这3种开挖方案的优劣,从中优选出最佳开挖方案,供施工时参考选用。

FEM has been a widely used method to simulate foundation pit excavation. But the 3D simulation of large foun- dation pit is rare because of the extensive and complicated scale. This paper focused on the foundation pit of Evergrande Center in Hefei, and based on this pit, 3 excavation projects were presented. Simulations were carried out based on the 3 excavation projects. Comparisons were made respectively from deep horizontal displacement of pile, the horizontal displace- ment of pile top, the surrounding ground settlement of foundation pit, and the axial force of cable. The optimal excavation project from the 3 excavation projects was decided and could provide a reference for engineering construction.