深基坑吊脚桩的理论计算及数值模拟研究

Research on Theoretical Calculation and Numerical Simulation of End-suspended Pile in Deep Foundation Pit

深圳观澜河调蓄池深基坑工程,运用三维拉格朗日方法对观澜河调蓄池深基坑施工过程中的吊脚桩支护性能进行数值模拟。针对二元结构深基坑吊脚桩的支护设计,提出了相应的计算方法和具体的设计步骤。通过典型剖面的基坑工程设计,探讨了深基坑开挖过程中岩土体应力场、位移场、塑性区以及吊脚桩内力的分布变化规律。数值分析结果与实际监测结果的对比分析,验证了二者的曲线变化规律较为接近,都满足变形要求。

The design theory of end-suspended pile in deep foundation pit is utilizd the three-dimensional Lagrange method to perform numerical simulation research on the performance of end-suspended pile support in the construction process of deep foundation pit for storage pond of Guanlan River,Shenzhen. Based on the research on support design of end-suspended pile in dual-structure deep foundation pit, corresponding calculation methods and specific design steps are put forward. As per the design of foundation pit engineering in typical section,the distribution and change law of internal force in stress field,displacement field,plastic zone and end-suspended pile in the deep foundation pit excavation process are discussed. The comparison of the numerical analysis results with the actually measured results has proved that the two curve change laws are very close,and meet the deformation requirements.