三维数值模拟(modflow)在基坑抽水试验中的应用

Application of Numerical Modeling to Pumping Test for Foundation Pit

为进行基坑降水设计,需要在前期进行抽水试验,通过试验求取水文地质参数。在此基础上对基坑围护与降水一体化设计。本文通过抽水试验采用modflow通过非稳定流计算水文地质参数,在分析水文地质条件的基础上,建立水文地质概念模型、数字模型,对截水帷幕三种方案模拟计算,对基坑周边地面沉降进行预测,结合工程降水实际,推荐截水帷幕的设计方案。

For the design of foundation pit dewatering,it is necessary to conduct pumping tests in the early stage and obtain hydrogeological parameters through the tests.On this basis,the integrated design of foundation pit support and dewatering is carried out.This article uses Modflow to calculate hydrogeological parameters through unstable flow through pumping tests.Based on the analysis of hydrogeological conditions,a hydrogeological conceptual model and digital model are established to simulate and calculate the three schemes of the curtain for cutting off drains.The ground subsidence around the foundation pit is predicted,and the design scheme of the curtain for cutting off drains is recommended based on the actual engineering precipitation.