复合土钉支护基坑位移和稳定性的有限元分析

Finite element analysis of the displacement and stability of composite soil nailed foundation pits

复合土钉支护作为一种基坑支护型式,由于变形较小、工程造价低廉,近年来在工程实践中得到了广泛应用。本文讨论了上海地区松软地层中基坑工程采用复合型土钉支护的变形和破坏机理和整体稳定性计算方法,采用有限元方法计算复合土钉支护位移和整体稳定性。通过上海某软土复合土钉支护的实例分析,验证了有限元方法在该领域应用的可行性,并建议将整体稳定系数和位移联系起来分析复合土钉支护。

The composite soil nailing wall is a kind of support for foundation pits.This method has been widely used in the project practice in recent years because of its excellent behaviors and low cost.The deformation and failure mechanism of composite soil nailing wall and the method to calculate its overall stability of foundation pits in Shanghai soft clay are discussed.The FEM is introduced to analyze the displacement and overall safety of the composite soil nailing wall.A case of composite soil nailing wall is employed to validate the proposed FEM.It is suggested that the displacement and overall safety factor should be considered together.