深基坑双层土体空间效应分析

Analysis on Spatial Effect of Double-layer Soil in Deep Foundation Pit

摘要:

随着城市的不断发展，基坑开始由传统的二维模式向三维空间转变。该文借助于坑壁土体的三维破坏模式，推导出双层土体的破坏模型，在此模型基础上基于土体塑性上限理论及极限平衡分析理论，提出了考虑空间效应的土压力计算公式以及相应的空间效应影响系数。该计算公式可用于基坑土钉墙、护坡桩、地下连续墙等支护系统的设计。

Abstract:

Accompanying with continuous development of the city, foundation pit began to change from the traditional two-dimensional model to three-dimensional space model. Based on three dimensional failure mode of the pit wall soil, damage model of double-layer soil has been deduced. Based on this model, soil plasticity and limit equilibrium theory, calculation formula and relative spacial effect coefficient of earth pressure with considering of spatial effect have been put forward. This formula can be used for designing nailing wall, slope protection pile and underground continuous wall supporting system of foundation pit.