带墩双排桩在基坑开挖中的工作性状分析

Working Performance Analysis for Double-row Piles with Pier in Deep Foundation Pit

对于平面面积较大的基坑,常规双排桩支护结构在基坑长边中部往往出现较大位移而可能导致失效,为改善其力学性能,本文提出一种带墩双排桩支护结构体系,并利用Midas GTS有限元软件建模分析佛山某工程实例基坑开挖中的工作性状,研究结果表明墩距及墩自身刚度的影响较大,墩距不宜大于60m,墩自身平面尺寸不宜小于8m×4m。

In the case of the deep foundation pit with large area,considerable displacement of conventional double-row piles retaining structure appears at the central section of the long direction of the pit,which possibly leads to working failure of the retaining structure. In order to improve its mechanical properties,a new double-row piles retaining structure with piers is proposed. Meanwhile,a finite element model made by Midas GTS software is applied to study the working performance for a deep foundation pit in Foshan. The results show that,the spacing and size of the pier have great influence on the working performance of the retaining structure,and the spacing of the pier should less than 60 m,while the size of the pier should larger than 8×4m.