论文部分内容阅读
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。
X-ray diffraction and SEM scanning electron microscopy analysis of carbonaceous shale samples of Weixiawangyan weak base in the Three Gorges reservoir area show that the content of montmorillonite, mica and chlorite in the mineral composition is high, and these layered structures Silicate minerals are highly absorbent and slippery; montmorillonites and micas transform into chlorites under the alkaline surface conditions in the karst area, and the shear strength of rocks is low, which leads to the instability of the rock mass. The triaxial compression tests of carbonaceous shale under different confining pressures were carried out by using the RMT-150C rock mechanics test system. The strength parameters of carbonaceous shale were obtained as follows: c = 200 kPa, internal friction angle φ = 29.9 °. The linear control equations were obtained by regression analysis of yield strength, peak strength, residual strength and confining pressure of rock. The stress-strain curve of carbonaceous shale was established by regression analysis. The results showed that compaction, elastic deformation, strain softening, Plastic flow of four stages.