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以某基坑工程项目为例,分析了局部拆撑及邻近分区基坑开挖对基坑坑底桩基侧移的影响。首先采用围护结构分析软件FRWS7.4对拆撑过程进行受力分析,然后根据力平衡原理,将得到的底板侧向作用力作用于桩基,并采用有限元软件ABAQUS进行二维模拟,得出局部拆撑过程中桩基位移和应力云图;然后计算了邻近基坑开挖造成的坑底桩基侧移,将局部拆撑及邻近基坑开挖对坑底桩基产生的附加侧移结果进行叠加,得出坑底桩基最终位移。结果表明,局部拆撑过程中桩基安全储备较足,后期的邻近基坑开挖过程对坑底桩基侧移影响较大,但不影响其正常使用。
Taking a certain foundation pit project as an example, the influence of partial dismantling and supporting and the excavation of the adjacent sub-area on the displacement of pile foundation at the bottom of foundation pit is analyzed. First, the force analysis of the bracing process is carried out by using the FRWS7.4 software. Then, the lateral force of the bottom plate is applied to the pile foundation according to the principle of force balance, and the two-dimensional simulation is performed with the finite element software ABAQUS Then the displacements and stress maps of pile foundation during partial bracing are presented. Then, the lateral displacement of pile foundation at pit bottom caused by excavation of adjacent foundation pit is calculated, and the additional lateral displacement The results are superimposed, resulting in the final displacement pits bottom. The results show that the pile foundation safety reserve is better than that of partial pile foundation during the process of partial detachment and support, and the influence of the adjacent excavation process on the lateral displacement of pile foundation at the late stage is relatively great, but it does not affect its normal use.