止水帷幕作用下基坑渗流场特性分析

Analysis on the Seepage Field Characteristic of Excavation with Waterproof Structure

基坑开挖卸荷导致土体应力场和地下水渗流场发生改变。为了分析止水帷幕对地下水渗流的影响,选取典型的基坑计算模型,利用FLAC3D对止水帷幕作用下基坑开挖过程进行三维流固耦合计算。分析得出基坑开挖过程中孔隙水压力、渗流场的速度特征、地表沉降量、坑底隆起量等的变化规律。结果表明,加宽止水帷幕的宽度,加深插入深度可以有效地控制这些地下水的不利因素,降低基坑开挖对周围环境的影响。

The soil stress field and groundwater seepage field would change with excavation unloading.In order to analyze the impact of waterproof structure on underground seepage,a typical pit computational model is selected.With FLAC3D,the 3D fluid-solid interaction has been worked out to analyze the excavation with waterproof structure,which finds out the change laws of pore water pressure,the velocity characteristics of seepage field,the ground settlement and bottom heave,etc..Results show that widening and deepening of the waterproof structure can effectively control these unfavorable underground water factors,reducing the influence on the surrounding environment caused by excavation.