深基坑斜直交替钢管桩复合土钉墙数值模拟分析

Numerical Simulation Analysis of Composite Soil Nailing Wall in Deep Foundation Pit with Inclined and Straight Steel Pipe Piles

依托福建某医院的基坑工程实例,采用数值模拟方法,研究斜直交替钢管桩复合土钉墙支护结构的变形特征及其稳定性。结果表明:坡面水平位移最大变形出现在基坑“腰部”,设计时应适当加强此位置的变形控制;斜直交替钢管桩复合土钉墙支护体系安全可行,其较双排直立钢管桩复合土钉墙及单一土钉墙有更好的变形控制能力和更高的稳定性。

Based on a foundation pit project in a hospital in Fuzhou,the numerical simulation method was adopted to study the deformation characteristics and stability of composite soil nailing wall with inclined and straight steel pipe piles.The result shows that the maximum deformation of horizontal displacement of the slope surface occurs at the"waist"position of the foundation pit,the deformation control of this position should be properly strengthened during designing.The supporting system of composite soil nailing wall with inclined and straight steel pipe piles is safe and feasible,and has better ability of deformation control and higher stability compared to composite soil nailing wall with double rows of vertical steel pipe piles or single form of soil nailing wall.