充分考虑水溶液中络合物的影响,计算坝址库区水环境中方解石、白云石、石膏的饱和指数;结合化学热力学、化学动力学、水文地球化学、水文地质学和矿物溶解动力学理论基础,采用据此推导出的由水化学指标表示的达西定律解析式,计算水电站复合坝基帷幕地质体的渗透系数。将计算结果与现场压水试验和灌浆帷幕防渗控制值、幕后渗排水量、水压、析出现象等指标进行对比,分析该计算方法在帷幕地质体上的适用性及合理性,并据此分析评价水电站防渗帷幕的运行现状。结果表明,用水质指标计算的渗透系数能很好地说明灌浆帷幕地质体的渗透现状,对评价帷幕防渗性能有指示作用,可为其他类似工程的帷幕性能评价提供参考。

By employing the Darcy’s law analytic expression expressed by hydrochemical indicators proposed by previous researchers for calculating hydrogeological parameters on theoretical basis of chemical thermodynamics, chemical kinetics, hydrogeochemistry, hydrogeology, and mineral dissolution kinetics, we calculated the permeability coefficient of seepage curtain in a compound dam foundation, and also the saturation index of calcite, dolomite, and gypsum in the water environment of dam site in full consideration of the impacts of complex compound in water. We analyzed the suitability and rationality of applying this method to seepage curtain by comparing the calculation results with in-situ permeability test results together with seepage control value, seepage amount, water pressure, and precipitation behind the curtain, and on this basis further evaluated the status of seepage curtain. Results demonstrate that permeability coefficient calculated by water quality indicators could well reflect the seepage status of grouting curtain. This paper is of referential value for evaluating the anti-seepage performance of grouting curtain in similar projects.