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岩石材料的变形和破坏与能量的变化密切相关。利用刚性伺服系统对大理岩岩样进行了系列三轴压缩试验,基于试验结果,对大理岩在加载过程中各阶段能量变化的具体数值进行了计算和整理,研究了能量变化在加载破坏各阶段分别与围压、应力、应变的内在联系。结果表明,初始围压的增大能够相当程度上提高岩样的破坏应变能。在既定围压下,岩样在弹性变形阶段的能量变化与偏应力和应变均成正线性关系。随着初始围压的增大,岩样所吸收的能量随偏应力变化的增长速率降低,随应变变化的增长速率加快。在三轴压缩过程中,岩样在弹性变形阶段所吸收的能量占总能量的比重较小,绝大部分能量耗散于岩样的屈服变形阶段;并且随着初始围压的增大,屈服变形阶段所吸收的能量占总能量的比重提高。
Deformation and destruction of rock materials and energy changes are closely related. A series of triaxial compression tests were carried out on marble samples using a rigid servo system. Based on the test results, specific values of the energy changes of the marble during the loading process were calculated and sorted. Respectively confining pressure, stress, strain of the internal relations. The results show that the initial confining pressure can increase the damage strain energy of rock samples considerably. Under the given confining pressure, the energy change of rock specimen in the stage of elastic deformation has a positive linear relationship with the deviatoric stress and strain. With the increase of initial confining pressure, the rate of energy absorption of rock samples decreases with the increase of deviatoric stress, and the rate of increase with strain changes accelerates. During the triaxial compression, the energy absorbed by the rock specimen in the elastic deformation phase accounts for a relatively small proportion of the total energy, and the vast majority of energy dissipates during the yield deformation of the rock specimen. As the initial confining pressure increases, The energy absorbed in the deformation phase increases the proportion of the total energy.