基于Visual MODFLOW的地下水流数值模拟——以四川垮梁子滑坡为例

摘要

In this paper,Kualiangzi Landslide in Fengdian Town,Zhongjiang County,Sichuan Province is taken as the study object. Based on the basic stratigraphic structure ascertained by engineering geological survey and the hydrogeological parameters and boundary conditions obtained by the combination of hydrogeological survey and field test (electrical resistivity tomography, DC charging method,Tracer test,water injection test,etc.),the hydrogeological conceptual model of the landslide area is estab-lished. Then the three-dimensional seepage model of groundwater anisotropy in Kualiangzi Rocky Landslide is established by u-sing Visual MODFLOW software. After identification and verification of the model,the sensitivity analysis of hydrogeological pa-rameters of the model is carried out. The results show that the permeability coefficient has a great influence on the accuracy of the model analysis,and the trailing edge water level plays a key role in the stability of the landslide. The simulation results can pro-vide scientific basis for predicting the stability of Kualiangzi landslide.%以四川省中江县冯店镇垮梁子滑坡为研究对象,通过工程地质勘察查明了研究区基本地层结构,结合水文地质调查与现场试验(电阻率成像法、直流充电法、示踪试验、注水试验等)获得的水文地质参数和边界条件,建立了滑坡区水文地质概念模型,并运用Visual MODFLOW软件构建了垮梁子岩质滑坡体中地下水各向异性三维渗流模型,经过模型的识别及验证,对模型的水文地质参数进行了敏感性分析.结果显示:渗透系数对模型的准确性影响较大,后缘水位对滑坡的稳定性起关键作用.模拟结果可以对垮梁子滑坡预警预报模型的建立提供科学依据.