深基坑桩锚支护三维应力应变数值分析

以某商业区建筑的深基坑工程为研究对象,对该深基坑的支护设计及其开挖施工方案进行了研究。通过方案比选,该基坑采用自然放坡,钻孔灌注桩加锚杆作为支护结构型式。运用三维数值方法建立了该工程的桩-锚支护深基坑三维数值模型,对基坑开挖全过程进行了三维非线性数值模拟,将数值模拟结果与其他方法的结果进行了对比分析,结果表明:三维数值模拟结果与经典方法的结果较为吻合,验证了设计方案的合理性与可行性。并运用有限差分法对深基坑工程分步开挖进行三维数值模拟分析,探讨了基坑支护结构的变形机理、特点及工作机理,并将数值模拟结果与理正软件计算结果进行对比分析,讨论两者的异同点。

3D Stress-strain Numerical Analysis on Pile-anchor Support in Deep Excavation

This paper, based on the deep excavation engineering for a building in commercial area, studied the support design and the construction plan thereof. Through proposal selection, the retaining structure of natural sloping, cast-in-situ bored pile with anchor bolt, was adopted in this excavation engineering. Then, 3D numerical model for this foundation pit with pile-anchor support was established herein to make 3D nonlinear numerical simulation on the whole process of excavation, and the result from the simulation was compared with those from other methods. The result shows that the outcome from the numerical simulation agrees with those from classical methods, demonstrating reasonability and feasibility of the design plan herein. In addition, finite difference method was used to make 3D numerical simulation on the stepped excavation of foundation pit, by which the mechanism and characteristics of deformation, and its working principle were discussed; and the comparison and analysis on the results obtained from numerical simulation and Lizheng software was carried out to discuss the differences and similarities of the both.