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利用MTS815.02电液伺服材料试验系统完成了不同温度作用后(25℃~1000℃),不同围压下的30块花岗岩岩样的三轴压缩试验,分析了温度、围压对岩样的变形以及强度特性的影响。试验结果表明:1岩样质量随着温度的升高小幅下降,1000℃时仅比25℃时下降了0.364%;温度低于600℃时,岩样体积、密度变化不明显,温度高于600℃时,体积加速膨胀,密度减小幅度增大,1000℃时体积比25℃时膨胀了5.027%,密度降低了5.132%。2高温作用后,岩样三轴压缩应力–应变曲线大致经历了压密、弹性、屈服、破坏、软化、残余等几个阶段,岩样的刚度、峰值强度、抗剪强度、残余强度、塑性变形均随着围压的增大而增大。3岩样黏聚力随着温度的升高呈线性下降,内摩擦角随着温度的升高先增大后减小,抗剪强度随着温度的升高呈二次多项式减小关系,围压的增大削弱了温度对抗剪强度的影响。
Triaxial compression tests of 30 granite samples under different confining pressure were carried out with MTS815.02 electro-hydraulic servo test system at different temperatures (25 ℃ ~ 1000 ℃) Deformation and the impact of strength characteristics. The results show that the quality of rock samples decreases slightly with the increase of temperature, and decreases by only 0.364% at 1000 ℃ than that at 25 ℃. When the temperature is lower than 600 ℃, the volume and density of rock samples do not change obviously and the temperature is higher than 600 ℃, the volume accelerates and the density decreases more. At 1000 ℃, the volume expands by 5.027% at 25 ℃ and the density decreases by 5.132%. After the high temperature effect, the triaxial compression stress-strain curve of the rock specimen undergoes several stages of compaction, elasticity, yielding, failure, softening, and residual. The stiffness, peak strength, shear strength, residual strength, Deformation increases with the confining pressure. 3 The cohesion of rock samples decreases linearly with the increase of temperature, the internal friction angle first increases and then decreases with the increase of temperature, and the second-order polynomial decreases with the increase of temperature. The confining pressure Increasing the effect of temperature on the shear strength is weakened.