黄土基坑双排桩支护结构的有限元分析

运用有限元软件ABAQUS建立双排桩支护结构的有限元模型,分析了黄土基坑双排桩支护结构中排距和桩身强度(包括桩的截面尺寸及桩身混凝土强度)对桩位移和弯矩的影响,并且在基坑和桩身情况相同的条件下,比较了单排桩和双排桩。研究结果表明,黄土基坑使用双排桩支护体系比单排桩支护体系在安全性能方面更具有优越性。计算给出了双排桩排距和桩截面尺寸的最佳取值范围,以及桩身所用混凝土的最佳强度等级。本文为黄土基坑双排桩支护结构的设计和施工提供了一定的参考依据。

The Finite Element Analysis on the Retaining Structure for Loess Foundation Pit with Double-Row Piles

The finite element software ABAQUS is used to establish the finite element model of retaining structure with double-row piles,and to analyze the effect of row spacing and the pile strength (includes the sectionandstrength of concretepile)of the retaining structure for loess foundation pit on the pile displacement and bending moment. As a contrast, the retaining structure with single-row pile is compared with the double-row piles under the same foundation condition.The results show that the double-row piles have more advantages than the single-row pile in aspect of safety performance in loess foundation pit.This paper provides the optimum value range of the row spacing, pile section size and optimum strength grade of concrete of the double-row piles, which offers reference and guidance to the construction and design of the double-row piles in loess foundation pit.