既有落底式止水帷幕对区域地下水位的影响

Influence of Existing Drop Waterproof Curtain on Regional Groundwater Level

随着武汉市城市建设规模的扩大,在各种复杂含水系统中开挖的深基坑越来越多,开挖深度越来越大,降水工程越来越受到各方关注。特别是在地下水位较高、渗透系数较大的地区进行基坑开挖,联合应用降水+止水来控制基坑地下水的方法,目前已深受广大工程界的认可。既有落底式止水帷幕存在的情况下再修建地下构筑物,势必会对整个区域的地下水产生影响。本文采用有限差分法软件Visual Modflow,采用了六个模拟简化和六个代表区域对汉口主城区这一大区域进行了几个工况的模拟,研究表明:地下构筑物对地下水位有一定影响,其影响规律随区域的不同而不同。

With the expansion of the urban construction scale of Wuhan,more and more deep foundation pits are excavated in various complex aquifer systems,and the excavation depth is increasing,which has drawn more and more attention to dewatering engineering.Especially in Wuhan area where the groundwater level is higher and the permeability coefficient is larger,the method of controlling the groundwater in the foundation pit by the combination of precipitation and water stop has been widely accepted by the engineering community.The construction of underground structures is bound to affect the groundwater in the whole area when the existing drop waterproof curtain exists.In this paper,the software Visual Modflow with finite difference method is used to simulate several working conditions in the main urban area of Hankou with six simplified simulations and six representative regions.The study result shows that underground structures have certain influence on the groundwater level,and the influence rule varies with different regions.