渗流作用对基坑支护结构稳定性的影响分析

Analysis of the seepage flow effect to stability of supporting structure for foundation pit

分析了基坑开挖过程中产生渗流的重要条件及地下水渗流对作用在支护结构上水土压力的影响。结果表明:基坑支护结构上水土压力的大小是关系基坑稳定的重要因素,对在基坑周围存在稳定渗流时支护结构上水土压力的变化进行了分析与对比计算,得出支护结构的稳定渗流减小了主动侧的水压力,但总的水平压力变化不大;被动侧的水压力有所增加,但总的水平压力减小较多。结合算例讨论了渗流作用对基坑支护结构稳定性的影响。

This paper analyzes the impact of underground water especially on strong seepage soil,when one calculates the supporting structure using rankine＇s theory of earth pressure,separate calculation of water and soil theories. Concerning this question, in order to accommodate the need of the actual construction companson methods,this paper puts forward a calculation method of seepage impact on water-earth pressure under the situation that groundwater seeps steadily. An actual example shows that the calculation is better, and the article uses the example to calculate the statistics and the result is more reasonable and closer to actuality. It is better than the conventional one.