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地质体中的软弱夹层对工程的安全运行具有潜在的不利影响。该文选取八盘峡水电站坝址夹层岩样在室内饱水状态下进行水-岩作用试验,试验时段内研究反应水溶液pH值和其中主要离子浓度的变化,结合夹层化学组分于试验前后的分析对比,探讨夹层组分的转化机制和液相组分随时间的动态演化规律。结果表明,夹层与水作用过程中,水溶液pH值短暂下降之后,又趋增大,并趋于相对稳定;同时水溶液中Mg2+、SO42-浓度变化呈指数缓慢增长趋势,Ca2+呈指数下降趋势,K+则呈线形增长趋势,这与控制它们参与水-岩作用的主导方式有关。
The weak interlayer in the geological body has the potential adverse effect on the safe operation of the project. In this paper, the water-rock interaction test was carried out under the saturated water in the laboratory at the site of the Bapanxia Hydropower Station dam. During the test period, the pH value of the reaction solution and the change of the main ion concentration were studied. Combined with the chemical composition of the interlayer before and after the test Analysis and comparison, to explore the sandwich component of the transformation mechanism and liquid components of the dynamic evolution of the law over time. The results showed that the pH value of aqueous solution tended to increase and tended to be relatively stable after the pH value of aqueous solution decreased briefly. At the same time, the concentration of Mg2 + and SO42- in aqueous solution showed an exponential slow-growing trend, the exponential declining trend of Ca2 + and K + There is a linear growth trend, which is related to the dominant way of controlling their participation in water-rock interaction.