某水电站坝址软弱夹层与水相互作用的试验研究  

Testing Study on Interaction between Weak Layer and Water of the Dam Site Zone of a Hydropower Station

作　　者：张国军[1] 宋汉周[1] 

机构地区：[1]河海大学土木工程学院,南京市210098

出　　处：《勘察科学技术》2007年第4期21-24,共4页Site Investigation Science and Technology

摘　　要：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。Weak layer in geological bodies has potential unfavorable effect on the safety operation of project. Based on the weak layer specimen taken from the dam site zone of Bapanxia hydropower station, the water-rock interaction tests axe carried out in the saturated condition. In the period of testing, the authors study the variation regularities of pH value and concentration of the main ions, combined with the comparative analyses for chemical constituent of weak interlayer before and after the test, and discuss transformation mechanism for interlayer constituent and dynamic evolution regularity of solution components with time changes. The results show that during the reaction process, the pH value of solution decreases, then increases and tends to stable relatively. Meanwhile, the concentration of Mg^2＋ , SO4^2- increases slowly and exponentially grow the concentration of Ca^2＋ decreases exponentially, and the concentration of K^＋ submits linear growth trend, all those axe related with the dominant function mode of water-rock interaction.

关 键 词：软弱夹层 水-岩作用 水溶液 离子浓度 

分 类 号：TV221.2[水利工程—水工结构工程]