岩溶富水区地下工程施工期地下水位变化规律分析

Analysis on the Changes of Underground Water Level of Underground Engineering during Construction in Karst Area with Rich Water

由于当前的计算水平有限和工程实用中存在的问题,在一个工程的渗流分析中同时采用几种不同的模型有些困难。为此,提出采用改进的等效连续介质渗流模型,即在实体建模过程中对岩溶发育区采用挖孔管道的形式按照自由出流进行模拟,裂隙发育区首先采用等效连续介质模型得到该区域的渗透张量然后在实际分析模型中仍采用均质连续模型,对工程区流场开展计算分析。结合我国西南某工程施工期地下水变化开展研究,得到了施工全过程地下水的动态变化情况,为工程设计和建设提供了依据。

Due to scant calculation level and practical application problems in engineering at present, it is difficult to simultaneously use several models to analyze seepage in a project. The improved equivalent continuous medium seepage model is presented herein, in which, the developed karst zone is regarded as pipes and simulated according to free outflow in modeling process, and the developed fracture zone is firstly studied by using equivalent continuous medium model to obtain the permeability tensor and then the homogeneous continuum model is still used to calculate the flow field in actual model analysis. Taking a project in southwestern China as study case, the dynamic changes of groundwater during construction period are understood by using above models and ca/culation methods. The results provide a basis for project design and construction.