设置抗浮抗拔桩深基坑的三维数值仿真分析

采用数值模拟分析的方法,运用三维实体单元模拟抗浮抗拔桩,分析了逆作法条件下抗浮抗拔桩对大面积、特深基坑开挖性状的影响及在基坑开挖过程中桩体的受力特性。分析结果表明:逆作法施工的带有抗浮抗拔桩基坑的坑底隆起量约为顺作法施工的带有抗浮抗拔桩基坑的坑底隆起量的1/3。受开挖区域的影响,承受轴力最大值、最小值桩体的平面位置是变化的。并将开挖过程中桩体轴力的计算结果和试验结果作了对比,对比结果表明:计算结果可作为工程施工的参考数据。

3D Numerical simulation analysis of deep excavation enforced by uplift piles

The effect on the large-scale and deep excavation excavated by the top-down method and enforced by uplift piles was analyzed.The axial forces of the piles simulated by 3D solid elements were studied.The results show that the upheaval of the excavation using the top-down method is about 1/3 compared with the excavation using the bottom-up method.The planimetric position of the piles which endure the extremum axial force is different.A comparison between the simulated and in-situ test results shows that numerical simulation is helpful to engineering.