三峡库区高陡危岩软弱基座力学特性研究——以望霞危岩炭质页岩基座为例

发布时间：2019-06-17 20:44

【摘要】：对三峡库区巫峡望霞危岩软弱基座炭质页岩样品进行X射线衍射与SEM扫描电镜分析,结果表明矿物成分中蒙脱石、云母、绿泥石含量较高,这些层状结构硅酸盐矿物具有高吸水性与易滑性特点;岩溶区地表碱性环境下蒙脱石和云母向绿泥石转化,岩石抗剪强度低,易发生滑动导致危岩体失稳。使用RMT-150C岩石力学试验系统进行不同围压下炭质页岩三轴压缩试验,通过一元线性回归分析方法获取了炭质页岩强度参数粘结力c=200 k Pa、内摩擦角φ=29.9°;对岩石屈服强度、峰值强度、残余强度与围压数据进行回归分析获得线性控制方程,建立了炭质页岩应力-应变全过程曲线,结果表现出压密、弹性变形、应变软化、塑性流动4个阶段。
[Abstract]:The results show that the content of smectite, mica and chlorite in the mineral composition is high, and the silicate minerals of these layered structures have the characteristics of high water-absorption and easy-to-slip, and the results show that the content of the smectite, mica and chlorite in the mineral composition is high. In the karst area, the conversion of the smectite and the mica to the chlorite in the alkaline environment, the shear strength of the rock is low, and the slip can lead to the instability of the dangerous rock mass. The triaxial compression test of the carbon shale under different confining pressure is carried out by using the RMT-150C rock mechanics test system. The strength parameters of the carbon shale are obtained by a single linear regression analysis method c = 200k Pa, and the internal friction angle is 29.9 掳; and the yield strength and the peak strength of the rock are obtained. The linear control equation is obtained by the regression analysis of the residual strength and the confining pressure data, and the whole process curve of the stress-strain of the carbon shale is established. The results show that the pressure density, the elastic deformation, the strain softening and the plastic flow are four stages.
【作者单位】：重庆市地质矿产勘查开发局208水文地质工程地质队重庆市地质灾害防治工程勘查设计院;西南大学地理科学学院;重庆市第八中学校;
【基金】：重庆市国土资源和房屋管理局科技计划项目(CQGT-KJ-2014042) 中央高校基本业务费专项资金资助(XDJK2015C069,XDJK2012B004,XDJK2012C032)~~
【分类号】：TU45

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