基坑降水过程挡土墙上土压力变化分析

Analysis on the Earth Pressure Change ofRetaining Wall by Dewatering

深基坑开挖、降水与支护已成为目前深基坑的主要问题,在基坑降水过程中,会增加土体的有效应力并使土体渗流固结。本文主要通过具体的工程试验,对基坑降水过程分析,在不同固结度情况下得出土体的c、Φ值的动态变化,并根据这动态变化的c、Φ值对朗肯土压力及库仑土压力进行计算比较,得出土体在施工降水过程中墙后土体的土压力变化特性,及土压力的局限性说明。

Pit excavation, dewatering and supporting have been the main problem of the excavation engi-neering. Effective stress increase and soil generate infiltrating-concretion along with dewatering. The article analyzes the dewatering mainly through specific engineering experiment, obtaining the dynamic changes of the values of c, Φ, under the condition of different degrees of consolidation. According to the dynamic changes of c, Φ, calculation and comparison of the Rankine’s earth pres-sure and the coulomb’s earth pressure, the earth pressure’s properties of soil in the process of dewatering, and the limitations of earth pressure are obtained.