扬中金源时代购物中心基坑降水数值模拟分析

Numerical simulation analysis of foundation pit dewatering at Yangzhong Jinyuan Times Shopping Center

摘要:

基坑降水的成功与否，将对基坑开挖和周边环境产生重要影响，因此有必要对基坑降水方案进行评估。针对扬中金源时代购物中心基坑降水问题，采用MIDAS/GTS对基坑降水效果进行研究。首先，依据地勘报告中提供的土体渗透系数，结合单井、双井抽水试验结果，反演出MIDAS/GTS中需要的土层渗流系数和边界函数；然后利用反演得到的参数，建立了考虑回灌井补水效应的三维基坑降水效果分析模型，模拟基坑内水位降深与时间的变化关系，并对基坑降水效果进行分析和评估，以期指导土方开挖工程的施工。

关键词:基坑降水、水文地质参数、MIDAS-GTS、数值分析法、反演计算

Abstract:

Proper foundation pit dewatering will have an important impact on the foundation pit excavation and the surrounding environment, so it is necessary to evaluate the foundation pit dewatering plan. In view of the problem of foundation pit dewatering at Yangzhong Jinyuan Times Shopping Center, MIDAS/GTS was utilized to study the effect of foundation pit dewatering. Firstly, according to the soil permeability coefficient provided in the geological survey report, in combination with the single well and double well pumping test results, the soil permeability coefficient and boundary functions required in the MIDAS/GTS were inverted. Then, with the parameters obtained from the inversion, a 3D analytical model of the foundation pit dewatering effect was established with consideration of the recharge effect of the backfilling well for simulation of the relationship between the water level drawdown and the time in the foundation pit any analysis and evaluation of the foundation pit dewatering effect, providing guide for earthwork excavation.

Key words:foundation pit dewatering; hydrogeological parameters; permeability coefficient; MIDAS/GTS; numerical analysis method; inversion calculation