岩溶发育地段地铁车站深基坑工程渗流参数数值模拟研究

Numerical simulation of seepage in foundation pit of subway station in karst area

以岩溶发育强烈的地铁车站基坑工程为例,系统阐述了基于等效多孔介质理论概化基坑场区岩溶地层水文地质条件,建立基坑场区岩溶地下水渗流数值模型的方法。通过将模型运用于抽水试验模拟,使得抽水试验模拟结果与实测误差在合理区间上,反演出基坑岩溶水文地质参数。最后从岩溶地层结构特征和抽水试验两方面对模拟误差进行分析,为基坑岩溶地层水文地质参数数值反演提出建议,可为今后岩溶基坑工程地下水渗流模拟提供参考,具有重要工程意义。

Taking the foundation pit engineering of subway station with strong karst development as an example,this paper systematically expounds the method of generalizing the hydrogeological conditions of karst stratum and establishing the numerical model of karst groundwater seepage in foundation pit field based on the theory of equivalent porous media.By applying the model to the simulation of pumping test,the error between the simulation results of pumping test and the measured results is within a reasonable range,and the karst hydrogeological parameters of foundation pit are inverted.Finally,the simulation errors are analyzed from the structural characteristics of karst stratum and pumping test,and some suggestions are put forward for numerical inversion of hydrogeological parameters of karst stratum in foundation pit.This paper can provide reference for groundwater seepage simulation of karst foundation pit engineering in the future and has important engineering significance.