石英-绿帘石化的蚀变特征及工程特性研究
发布时间：2019-06-01 11:33
【摘要】：针对大岗山水电站坝区石英-绿帘石化蚀变问题,在系统调研和室内试验基础上探讨了石英-绿帘石化蚀变带的地质特征、矿物学特征及物理力学性质。研究表明,花岗岩体中SN/E∠17°~26°缓倾角错动带常发育由动力变质作用形成的石英-绿帘石相蚀变,错动面常发育擦痕、阶步。蚀变产生了绢云母、绿泥石、绿帘石和方解石等软弱矿物,含量在18%左右,化学分析显示其成分变化不大。物理力学试验显示:蚀变岩石物理水理和强度特性有一定程度的弱化,天然和饱和抗压强度损失率为8.3%和5.9%。蚀变产生的石英和绿帘石对结构面的抗剪强度产生一定影响,现场直剪试验表明结构面抗剪(断)强度明显降低。研究成果具有一定创新性,对石英-绿帘石化蚀变的工程影响和处理提供参考。
[Abstract]:Aiming at the problem of quartz-green curtain alteration in dam area of Dagangshan Hydropower Station, the geological characteristics, mineralogical characteristics and physical and mechanical properties of quartz-green curtain alteration zone are discussed on the basis of systematic investigation and laboratory test. The results show that the quartz-chlorite phase alteration formed by dynamic metamorphism is often developed in the SN/E 鈮，
本文编号：2490240
[Abstract]:Aiming at the problem of quartz-green curtain alteration in dam area of Dagangshan Hydropower Station, the geological characteristics, mineralogical characteristics and physical and mechanical properties of quartz-green curtain alteration zone are discussed on the basis of systematic investigation and laboratory test. The results show that the quartz-chlorite phase alteration formed by dynamic metamorphism is often developed in the SN/E 鈮，
本文编号：2490240
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