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基坑开挖引起的地层移动对临近建筑物下桩基产生影响。运用岩土数值计算软件FLAC3D进行了多支撑围护基坑开挖对邻近桩基影响的三维数值研究,采用修正剑桥硬化土模型模拟土体的非线性应力—应变关系,桩基采用线弹性模型,桩土之间建立接触面。首先在标准问题中对不同桩顶约束条件的邻近桩基进行了研究,然后就围护墙体水平位移量、桩基与基坑开挖面的距离、桩基刚度、桩基长度和桩顶竖向荷载等因素对邻近桩基的影响规律进行了研究,计算结果与先前学者的工程实测结果进行了对比,与工程实测数据在其基本分布方面具有较高的一致性,可为相关的设计施工提供参考。
The formation movement caused by the excavation of the foundation pit affects the pile foundations near the building. The three-dimensional numerical study on the effect of excavation of adjacent retaining foundations on the adjacent pile foundation is carried out by using FLAC3D software. The nonlinear stress-strain relationship of soils is modeled by a modified Cambridge hardened soil model. The linear elastic model , Set up contact surface between pile soil. First of all, in the standard problem, the adjacent pile foundation with different pile top constraints was studied. Then, the horizontal displacement of retaining wall, the distance between pile foundation and excavation face, the stiffness of pile foundation, the length of pile foundation, Vertical load and other factors on the impact of the adjacent pile foundation, the calculation results with the previous scholars measured the results were compared with the actual measured data in its basic distribution of a high degree of consistency can be related to the design Construction for reference.