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为了研究岩石在加载和卸围压试验条件下的岩石力学特性,采用TAW-2000微机控制岩石伺服压力试验机,通过三轴加载和固定轴向应变卸围压的试验方法对辉绿岩进行了试验研究,分析了岩石在加载和卸围压条件下的岩石力学特性。并引入由Hoek-Brown屈服准则定义的主应力包络线切线,计算岩石峰值强度和残余强度时的粘聚力c和内摩擦角,获得了岩石在加载和卸围压条件下的岩石力学参数的变化特征。结果表明:在卸围压试验条件下,岩石在屈服破坏后,同样具有应变软化特性和破裂膨胀特性,但由于在卸围压条件下应变能的释放,岩石力学特性受围压的影响表现得更为突出。通过对加载和卸围压试验条件下的岩石力学参数进行比较分析,得到了岩石力学参数c、随围压的变化的规律。研究成果可为地下工程开挖过程中围岩受力变形特性研究提供参考。
In order to study the rock mechanics characteristics under the conditions of loading and unloading confining pressure test, using the TAW-2000 microcomputer-controlled rock servo pressure testing machine, the diabase was tested by triaxial loading and fixed axial unloading confining pressure test The rock mechanics characteristics of rock under loading and unloading confining pressure were analyzed. The tangent of the principal stress envelope defined by the Hoek-Brown yield criterion is introduced to calculate the cohesion c and the internal friction angle 岩 when the rock peak strength and residual strength are obtained. The rock mechanics under loading and unloading confining pressures Variation of parameters. The results show that under the conditions of unconfining confining pressure, the rock also has the characteristics of strain softening and rupture after yield failure. However, due to the release of strain energy under unloading confining pressure, the rock mechanics characteristics are affected by confining pressure More prominent. Comparing the rock mechanics parameters under loading and unloading confining pressure test conditions, the laws of rock mechanical parameters c and with the confining pressure are obtained. The research results can provide a reference for the study of mechanical deformation of surrounding rock during excavation of underground engineering.