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在喀斯特地区建设和管理水电站难度较大,不但要考虑水库蓄水、岩溶的发育、以及大坝的安全稳定等因素,还需要考虑水文水化学对大坝和机组安全运行的影响。通过对贵州普定水电站大坝的坝底廊道和左右坝肩廊道水的监测和取样,对水温、水位、电导率、Ca2+、Mg2+和HCO-3进行了对比初步分析。得出以下认识:从水温和水位上看,其对大坝安全运行产生风险的可能性不大;根据对Ca2+、Mg2+和HCO-3的分析结果,发现三个廊道内水对大坝都具有不同程度的侵蚀作用,对帷幕灌浆的砼结构有不同程度的破坏,对冲沙闸附近的混凝土的侵蚀程度比其他位置要大;同时发现所有水的Ca2+浓度都较高,很可能对发动机安全运行造成影响,需要定期维护消除。
It is more difficult to construct and manage hydropower stations in the karst area. It not only needs to consider reservoir storage, karst development, and the safety and stability of the dam, but also consider the impact of hydrochemistry on the safe operation of dams and units. The water temperature, water level, electrical conductivity, Ca2 +, Mg2 + and HCO-3 were compared and analyzed by monitoring and sampling the dam bottom gallery and the right and left dam gallery corridors of Puding Hydropower Station in Guizhou. The following conclusions can be drawn: From the view of water temperature and water level, it is unlikely that it will pose a risk to the safe operation of the dam. According to the analysis results of Ca2 +, Mg2 + and HCO-3, Different degrees of erosion, to the curtain grouting of concrete structures have varying degrees of damage, the erosion of the concrete near the flushing sand gate greater than other locations; also found that all water Ca2 + concentrations are high, it is possible for the safe operation of the engine Impact, need regular maintenance to eliminate.