渗流条件下基坑水-土压力不同计算方法的比较

Comparsion of earth pressure and water pressure between varied calculation methods with seepage

地下水渗流一直是基坑工程研究中的难点和热点。近年来,一些学者基于自己的研究成果分别提出了渗流条件下基坑水-土压力的计算方法(统称传统方法)。另外,岩土有限元软件PLAXIS则通过渗流-应变耦合来计算渗流条件下的水-土压力。结合工程算例,比较了当前基坑工程中传统水-土压力计算方法与PLAXIS程序的计算结果,发现由于部分计算假定与实际情况不符,导致传统水-土压力计算方法存在一定误差;提出了传统水-土压力计算方法的适用条件,并指出真实的水力条件下,PLAXIS程序考虑渗流-应变耦合得到的水-土压力计算结果是合理可信的。

Seepage is always a difficult point and a hot topic. In recent years,some scholars have put forward calculation methods of earth pressure and water pressure(called convention methods) on retaining structure with seepage based on their research findings. In addition,the finite element program PLAXIS can calculate earth pressure and water pressure on retaining structure through seepage flow-strain coupling. The article compares calculation results between convention methods and PLAXIS,then finds there are definite errors in calculation results because their assumptions differ from the fact. And the article analyses applied condition of invention methods and points out that earth pressure and water pressue with PLAXIS are appropriate and believable under true waterpower conditions.