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为研究不同应力路径下岩石的能耗变化规律,采用MTS815岩石力学试验系统开展了砂岩的单轴压缩、常规三轴和卸荷三轴试验。结果表明:耗散能曲线变化是岩石内部损伤和破裂产生的表现,在弹塑性变形阶段,常规三轴耗散的能量占岩石吸收总能量的比例最大,卸荷三轴次之,单轴压缩最小;岩石的储能极限与围压具有明显的线性关系,单轴压缩试验中岩石的储能极限最低,卸荷三轴次之,常规三轴试验岩石的储能极限最高;岩石峰前和峰后的能量耗散速率与围压也具有良好的线性关系,峰后应力跌落阶段能量耗散速率明显较峰前能量耗散速率大数倍至数十倍,说明岩石峰前损伤速率较小,而峰后却快速损伤破裂,耗散能曲线的突然变陡表明岩石破坏发生。
In order to study the law of energy consumption of rock under different stress paths, uniaxial compression of sandstone, triaxial triaxial test and unloading triaxial test were carried out by MTS815 rock mechanics test system. The results show that the change of dissipation energy curve is the result of damage and rupture in the rock. During the elasto-plastic deformation stage, the energy dissipated by the conventional triaxial rock accounts for the largest proportion of the total energy absorbed by the rock, followed by the triaxial unloading and uniaxial compression Minimum; rock energy storage limit and confining pressure has a clear linear relationship, uniaxial compression test rock lowest energy storage, unloading triaxial second, the conventional triaxial test rock storage limit is the highest; rock peak before and After the peak energy dissipation rate and the confining pressure also has a good linear relationship, after the peak stress drop phase energy dissipation rate was significantly higher than the peak energy dissipation rate several times to dozens of times, indicating the rock before the peak damage rate is small , But the peak after the rapid damage rupture, dissipative energy curve suddenly steep rock damage that occurred.