预留土基坑开挖简化计算方法的有限元研究

FINITE ELEMENT ANALYSIS OF SIMPLIFIED CALCULATION METHODS FOR RESERVED SOIL FOUNDATION PIT EXCAVATION

为研究预留土基坑开挖简化计算方法的适用范围,用PLAXIS 2D有限元软件对天津翔宇广场基坑开挖过程进行数值模拟,在此基础上,对FRWS 9.X法、颜敬法、陈红庆法进行研究对比。结果表明,天津翔宇广场基坑开挖时的支护结构内力变形宜采用颜敬法进行有限元计算。基坑预留土尺寸对各简化方法有限元结果的精度有影响。可见预留土基坑开挖简化计算方法适用范围不同。

In order to study the application range of simplified calculation methods for reserved soil foundation pit,PLAXIS 2D is used to calculate the excavation process of the Tianjin Xiangyu square foundation pit.On this basis,FRWS 9.x method,Yanjing method,Chen Hongqing method were compared and studied.The analysis shows that the internal force and deformation of the support structure in the Tianjin Xiangyu square excavation process should be calculated by the Yanjing method.The precision of simplified methods are effected by the size of earth berm.So the application range of simplified calculation methods for reserved soil foundation pit is different.