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岩石的细观结构影响其受载过程中的能量行为。从岩石基元平均强度、均质度和细观特征尺度等3种细观特征入手,研究了其对特征能量参数和能量特征指数的影响规律。结果表明:(1)基元平均强度越大,相同应力比下的输入能量密度和积聚弹性能密度呈非线性增长;峰后所需耗散能密度变化不大,约为500~2000J/m3;弹性能转化率变小;岩样能量特征指数呈指数型增长。(2)随着均质度的升高,峰前输入能量密度和积聚弹性能密度都呈线性增长;峰后破坏所需耗散能降低;越来越多的能量转化为弹性能积聚在岩石内;能量特征指数线性增大。(3)细观特征尺度越大,外界输入能量和积聚弹性能都增大,但幅度不同;峰后破坏所需耗散能越大;弹性能转化比例越低;当细观特征尺度小于1mm时,能量特征指数大幅减小,而当其大于1mm时,变化不大。
The meso-structure of the rock affects the energy behavior of the rock during its loading. Based on three kinds of mesoscopic features, such as average strength, homogeneity and mesoscale features of rock primitives, the influence laws of characteristic parameters on energy and energy index were studied. The results show that: (1) The greater the average strength of the element is, the higher the input energy density and the energy density of accumulative elastic energy increase nonlinearly at the same stress ratio; the required dissipation energy density after the peak does not change much, about 500 ~ 2000J / m3 ; The elastic energy conversion rate becomes smaller; the energy characteristic index of rock samples increases exponentially. (2) As the homogeneity increases, the input energy density and accumulated elastic energy density increase linearly; the dissipative energy required for post-peak damage decreases; more and more energy is converted into elastic energy that accumulates in the rock Within; the energy characteristic index increases linearly. (3) The larger the meso-scale, the larger the input energy and the accumulative elastic energy of the external environment, but with different amplitudes; the larger the dissipative energy required for the post-peak damage; the lower the elastic energy conversion ratio; , The energy signature index decreased significantly, but when it was more than 1mm, the change was insignificant.