基于ABAQUS的特殊双排桩支护结构三维有限元模拟

3D Finite Element Simulation for Special Type of Double-Row Piles Supporting Structure Relying on ABAQUS

由于支护空间受到限制等原因,工程中出现了只有后排桩挡土的特殊双排桩支护结构,和前后排间有土体的一般双排桩支护结构明显不同。为了探讨特殊双排桩的支护效应,运用大型有限元软件ABAQUS对其进行模拟分析,详细说明了使用ABAQUS模拟双排桩支护基坑开挖的关键步骤,并给出地应力平衡的相关原理。通过对实际工程的模拟,得知一般双排桩与特殊双排桩的内力分布及变形特征基本呈相反形式,相同条件下,一般双排桩的支护效果要优于特殊双排桩。笔者分析了特殊双排桩支护结构内力分布及变形的空间效应,并提出优化靠近坑角处支护结构设计的措施。

For the reason that the supporting space is constrained,there appears a special double-row pile supporting structure with the back-row pile for resisting the soil mass only in the excavation engineering,it is quite different from the common double-row pile supporting structure with soil mass around them. The finite element software ABAQUS is adopted to make a simulation and analysis to study the effect of the special double-row pile supporting structure. Detailed descriptions of the key steps in simulating the double-row piles supporting pit excavation by ABAQUS and the relevant theories of establishing the initial geostatic stress field are given. The simulation for a practical project has been performed,it shows that the internal force and the deformation character of the special doublerow piles are opposite to those of the common double-row piles. Under the same condition,the supporting effect of the common double-row pile is better than that of special double-row piles. Study on the internal force and spatial effect of deformation of the special double-row pile supporting structure is carried out and the measures of optimizing the design of supporting structure in the vicinity of pit corner are proposed.