考虑残余应力的基坑回弹变形分析

Rebound deformation of foundation pits considering residual stress

基坑的回弹对基坑的稳定和变形具有重要的影响,基坑的回弹受基坑大小、挖深、宽度、地基土性质、暴露时间等因素影响,在应力路径原理的基础上,基于"残余应力方法建立的基坑隆起变形计算模型",通过两个实际工程案例就基坑的挖深、宽度、地基土性质、应力路径等方面考虑,对其进行计算并与实测数据对比分析,二者具有较好的一致性,可以较准确的预测基坑土体的最终变形,对今后的基坑结构设计、变形预测有较大意义。

The rebound deformation of foundation pits has significant influence on their stability and deformation.The rebound deformation is influenced by their area,depth,width,soil property,exposure time and etc.Based on the model of rebound deformation of foundation pits considering residual stress by the stress path theory,the model can consider the depth,width,soil property and unloading stress path of the foundation pits,a comparison between the model calculation and observation data demonstrates that the proposed model can accurately predict the rebound deformation of foundation pits.The model can predict the final deformation.It is significant for the design of foundation pits and prediction of their deformation in the future.