桩锚支护结构参数优化有限元分析

Finite Element Analysis on Parameters Optimization of Pile Anchor Retaining Structure

目的研究桩锚支护参数变化对支护效果的影响,确保在建筑基坑支护设计中做到安全、经济、合理.方法采用有限元法对实际基坑工程支护设计进行数值模拟,详细分析改变锚索的倾斜角度以及施加在锚索上的预应力的大小这两个设计参数对基坑和桩体的变形情况的影响.结果在锚索角度不变的情况下,增加预应力的大小,桩顶的位移是逐渐增加的.但是桩顶位移时间曲线的走向趋势是大致相似的;在预应力不变的情况下,随着锚索角度的增加,桩顶的位移是逐渐减小的,但是幅度比较小.结论锚索倾角在一定范围内的变化对基坑的位移影响相对较小,锚索预应力的改变对基坑位移的影响比较明显,有限单元法对基坑支护进行数值模拟分析是有效的、可行的.

This paper was proposed to study the parameters influence on the pile anchor supporting effect in order to guarantee security, feasibility and economy in construction excavation design. The finite element method was used to simulate the excavation supporting design, analyzing the deform- ation of excavation and pile body in detail caused by tilt angle and the prestress applied on anchor. Under the condition that the anchor angle was unchanged, increaseing the prestress lead to in- creased displacement on the top of the pile. However, the trend towards the displacement - time curve was substantially similar, under the condition of the prestress unchanged, the pile displace- ment on the top was decreasing with increased anchor angle, but the displacement was relatively small. Therefore,displacement of the anchor angle was relatively small within a certain variation range, but the impact of prestress was more obvious. Finite element method is valid and feasible to employ numerical simulation analysis on pile anchor retaining structure.