基于RTS-500岩石流变仪三轴强度和变形特性

Three axis strength of deformation characteristics of rock rheometer based on RTS-500

采用英国GDS公司生产的RTS-500型岩石三轴流变仪试验机,进行不同围岩条件下的三轴压缩实验,并对试验结果进行分析.确定三轴围压下的峰值应力以及其应变的变化规律,以及根据Mohr-Coulomb强度理论确定岩石的c、φ值的变化规律,研究绿泥石英片岩的强度和变形特性.结果表明:在低围压时,岩样内部非均匀化,岩石表现为脆性特性;在高围压时,岩样内部由低到高逐渐屈服,内部趋于均匀化,此时岩石出现由脆性向塑形特性转变的趋势.岩石的峰值应变与围压呈显著的线性关系,岩石残余强度对围压的敏感性明显高于峰值强度.RTS-500型岩石三轴流变仪系统实验精度较高,实验数据可靠.

Triaxial tests were performed under different wall rock conditions by applying RTS-500 triaxial rheometer. The peak stress and its changing rule under triaxial confining pressure were determined. The rock variation of c,φvalue were calculated in accordance with the Mohr-Coulomb strength theory. Furthermore, the strength and deformation characteristics of quartz schist were analyzed. The results show that the rock demon-strate brittle characteristics under low confining pressure with non-uniformed rock internal heterogeneity. The rock specimen is observed in a changing tendency from low to high yield at high confining pressure with uni-formed internal characteristics. The rock tends to transform from brittle to plastic features. The peak strain and confining pressure of rock show a significant linear relationship. The sensitivity of the residual strength of the rock is obviously higher than the peak strength. Moreover, the experiments of RTS-500 rock rheometer system is precise and reliable.