基于GMS的场地基坑降水数值模拟研究

Study on numerical simulation of the dewatering of foundation pit based on GMS

本文基于上海某项目场地抽水试验,通过分析场地水文地质和工程地质条件,采用GMS数值模拟软件建立该场地地下水三维渗流与地面沉降耦合模型,通过拟合水位和沉降观测孔数据对模型进行识别验证,获取了修正后的水文地质参数。用此模型预测了基坑降水方案实施一周后场内地下水稳定水位以及抽水三个月后引起的周围土体沉降空间分布,并通过分析比较计算出了该基坑降水方案下防渗墙的最优设计深度,为降水方案的可行性评估和优化设计提供了科学依据。

A coupled model for dewatering and ground subsidence in a pumping test in Shanghai is established by using GMS through analyzing the hydrogeological and engineering geological conditions. The model is validated by groundwater level and settlement data from the observation data and the parameters in the model are back calculated. The model is used to predict the stable groundwater level after one week of pumping and the settlement of surrounding soil caused by pumping for three months. The best depth of waterproof curtains is calculated by analysis and comparison finally,and a scientific basis and feasibility assessment of the dewatering scheme is provided.