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开展不同灰砂配比、质量分数的充填体三轴压缩试验,研究了不同围压加载阶段充填体的能量耗散与围压、应变以及应力的内在关系.结果表明,在低围压时,充填体的极限抗压强度低;随着围压的增加,充填体的峰值强度随之增大,峰前能耗占总能耗的比重越来越大,说明充填体屈服阶段吸收的能量占总能量的比重提高,围压的增大能够提高充填体的破坏能耗量;充填体的峰前能耗量、峰后能耗量、单位体积变形能以及总能耗与围压呈二次函数曲线关系.当围压一定时,充填体在弹性变形阶段的能量变化与轴向应力、偏应力均呈线性关系,与轴向应变呈指数函数曲线关系;随着轴向载荷增加,能量随轴向应力、偏应力变化的增长速率加大.
The three-axis compression tests of different proportion of sand and sand and the mass fraction of filling body were carried out to study the inherent relationship between energy dissipation and confining pressure, strain and stress of the filling body under different confining pressure.The results show that at low confining pressure, The ultimate compressive strength of the filling body is low; with the confining pressure increasing, the peak strength of the filling body increases, the proportion of the energy consumption before the peak becomes more and more important, which shows that the energy absorbed during the yielding phase of the filling body accounts for The proportion of the total energy increases, and the confining pressure increases the destruction energy consumption of the filling body. The peak energy consumption, post-peak energy consumption, unit volumetric deformation energy, total energy consumption and confining pressure of the filling body are secondary When the confining pressure is constant, the energy change of the filling body in the stage of elastic deformation has a linear relationship with the axial stress and the deviatoric stress, and has an exponential function curve with the axial strain. With the increase of axial load, Axial stress, partial stress increases the rate of increase.