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大宁河中梁水电站库区汇水面积不大,河流径流量小,因此采取工程措施控制库区及坝区渗漏就显得格外重要。该文在分析坝区地质、水文地质条件的基础上,对坝区岩体渗透性进行了评价。考虑到坝基灌浆帷幕、坝体混凝土面板、坝体堆石料及坝基岩体渗透的非均质性,建立了计算区域内地下水流数学模型。采用解析和数值方法对坝区渗漏进行了计算与评价。结果表明,坝基帷幕和坝体混凝土面板具有很好的防渗效果,而坝区岸坡岩体的风化程度对坝肩绕坝渗漏量的影响较为明显,应予以重视。
Therefore, taking engineering measures to control seepage in the reservoir area and dam area is especially important. Based on the analysis of geological and hydrogeological conditions in dam area, the permeability of rock mass in dam area is evaluated. Taking into account the grouting curtain of dam foundation, dam concrete slab, rockfill dam material and the rock mass infiltration heterogeneity, a mathematical model of groundwater flow in the calculation area is established. The analytic and numerical methods were used to calculate and evaluate the seepage in the dam area. The results show that dam foundation curtain wall and dam concrete face plate have good anti-seepage effect, and the weathering degree of bank rock mass dam has obvious influence on leakage around dam abutment, which should be paid attention to.