【摘要】 为获得不同含水条件下花岗岩力学特性和能量演化特征，开展三轴压缩试验，研究了干燥、饱水花岗岩试样力学特性及耗散能比的演化规律，并预测了其损伤应力。研究结果表明，随着围压提高，花岗岩试样的峰值偏应力、弹性模量、特征应力及能量密度(总能量、弹性能、耗散能)均逐渐增大，破坏模式逐渐从张拉-劈裂型转变为剪切-张拉复合型。对比干燥与饱水试样力学特性测试结果表明，饱水作用将导致花岗岩强度和刚度明显劣化。三轴压缩过程中花岗岩能量密度演化可分为压密、线弹性变形、裂纹稳定发展、裂纹不稳定扩展及峰后破坏5个阶段。通过耗散能与总能量之比确定耗散能比，并基于耗散能比最小值预测了花岗岩的损伤应力，预测值与试验值符合较好。更多还原

【Abstract】 In order to obtain the mechanical properties and energy evolution characteristics of granite under different moisture conditions, triaxial compression tests were conducted to analyze the mechanical properties and the evolution of the dissipated energy ratio of both dry and saturated specimen, and to predict its damage stress. The results show that as the confining pressure increases, the peak deviatoric stress, elastic modulus, characteristic stress, and energy density(total energy, elastic energy, and dissipated energy) of the granite gradually increase, and the failure mode converts from tensile splitting to a shear-tensile composite. Comparing the mechanical properties of dry and saturated specimen, it is shown that saturation will lead to obvious deterioration of granite. The energy density evolution curve of granite can be divided into compaction, linear elastic deformation, stable crack propagation, unstable crack propagation, and post-peak failure stages. The ratio of dissipated energy to total energy is defined as the dissipated energy ratio, and the damage stress is predicted based on the minimum of the dissipated energy ratio. The predicted values agree well with experiment data.更多还原