基于Plaxis的深基坑局部挖深对支护结构的影响模拟

针对澳门某深基坑支护，采用有限元软件建立深基坑不对称开挖数值模型，模拟基坑开挖过程，分析基坑局部挖深对支护结构应力应变的影响。计算结果表明，深基坑局部挖深对基坑整体稳定影响较大，可影响内撑系统轴力分布，但对支护桩最大弯矩影响较小。研究可对深基坑局部挖深工况下支护结构的选型设计，基坑坑中坑支护安全性、实用经济性的平衡提供指导。

The simulation for the effect of asymmetric excavation in deep foundation pit based on Plaxis

Aiming at the support of a deep foundation pit in Macau,a numerical model of asymmetric excavation of deep foundation pit is established by using finite element software to simulate the excavation process of foundation pit,and the effect of local excavation of foundation pit on stress and strain of support structure is analyzed.The results show that the local excavation of deep foundation pit has a great influence on the overall stability of the foundation pit,and can affect the distribution of the axial force of the internal bracing system,but has little influence on the maximum bending moment of the supporting pile.The research can provide guidance for the selection and design of supporting structure under the condition of partial excavation of deep foundation pit,and the balance of safety and practicability economy of pit-in-pit in deep foundation pit.