三轴压缩下水影响绿泥石片岩力学性质试验研究

EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES OF CHLORITE SCHIST WITH WATER UNDER TRIAXIAL COMPRESSION

为了解西安黑河水利工程坝肩绿泥石片岩的力学特性,利用RMT–150C岩石力学多功能试验机,分别对干燥和饱水状态的绿泥石片岩进行三轴压缩试验。基于试验结果,比较试样在不同围压作用下的力学性质,详细讨论水对试样强度和变形特性的影响规律,重点研究峰值强度、残余强度、软化系数、峰残差、峰残强降率、弹性模量及变形模量等强度变形指标的围压效应,最后分析三轴压缩状态下岩石的破坏类型及机制。结果表明,绿泥石片岩属于水敏型岩石,水对各个强度和变形特性的影响是显著的,并随着围压呈一定规律的变化。

In order to understand the mechanical properties of chlorite schist in Heihe Hydraulic Project, triaxial compression experiment is carried out to investigate dry and saturated chlorite schist specimens by rock mechanics test equipment RMT - 150C. Based on the experimental results, the mechanical properties of dry and saturated specimens of chlorides chist are compared under different confining pressures; and the law of water effect on strength and deformation characteristics of the rock is discussed. Confining pressure effects on strength and deformation parameters, including peak strength, residual strength, softening coefficient, peak-residual strength error, peak-residual strength drop rate, elastic modulus and deformation modulus, are mainly studied. In addition, the failure type and mechanism of rock under triaxial compression are analyzed. The results show that the chlorite schist is a type of water-sensitive rock; and the effects of water on strengths and deformation characteristics of rock are obvious and vary with different confining pressures.