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利用MTS815岩石力学试验系统完成了不同温度下的20个花岗岩试样的三轴压缩试验。分析了温度对花岗岩试样的强度特性、变形特性以及破坏特征的影响,能够在实际工程中起到一定的指导作用。试验结果表明:在20℃到40℃的范围,弹性模量随温度升高而降低,泊松比随温度升高而升高,且变化幅度都较大,但当温度超过40℃以后,随温度升高的变化幅度明显降低;随着温度的升高,峰值强度逐渐降低,而且温度对峰值强度的影响随着围压的增加而减弱;内聚力c值随温度升高而降低,内摩擦角φ值随温度升高有升高的趋势,抗剪强度τf大致呈线性减小的关系,且随着正应力的升高,温度对花岗岩抗剪强度的影响有减弱的趋势;花岗岩的变形破坏特征在一般条件下表现为典型的弹脆性体特征,但是在较高围压和较高的温度耦合作用下表现为弹塑性变形-累进性破裂-脆性破坏的特征。
Triaxial compression tests of 20 granite samples at different temperatures were completed using the MTS815 Rock Mechanics Test System. The effect of temperature on the strength, deformation and failure characteristics of granite samples is analyzed, which can play a guiding role in practical engineering. The experimental results show that at 20 ℃ to 40 ℃, the elastic modulus decreases with the increase of temperature, and the Poisson’s ratio increases with the increase of temperature, and the variation range is larger. However, when the temperature exceeds 40 ℃, With the increase of temperature, the peak intensity gradually decreases, and the effect of temperature on peak intensity decreases with the increase of confining pressure. The cohesion c value decreases with the increase of temperature, and the internal friction angle The φ value tends to increase with temperature, and the shear strength τf decreases linearly. With the increase of normal stress, the effect of temperature on the shear strength of granite tends to be weakened. The deformation and failure of granite Under typical conditions, the characteristics show the typical characteristics of elastic body and brittle body, but they are characterized by elastic-plastic deformation-progressive rupture-brittle failure under the action of higher confining pressure and higher temperature.