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采用相似材料模型对节理岩石进行分离式Hopkinson压杆试验.通过设置不同的节理厚度和加载速度,研究了冲击荷载作用下岩石动态抗压强度变化规律及相应的破坏形式,分析了节理厚度对应力波穿越节理时波动性质及能量耗散的影响,并从能量角度表征了岩石损伤变化规律.结果表明:随着充填物厚度的增加,节理岩石动态抗压强度逐渐降低,其破裂形式以张拉破坏为主,但节理介质的存在会影响岩石破坏程度,节理厚度的变化会导致相应的单侧破坏;相同入射能条件下,充填节理的厚度越大,岩石反射能力越强,透射波衰减幅度越大,能量耗散也越多;节理岩石的入射能和反射能随冲击速度的增大呈增长趋势,透射能则是先增大后减小,通过能量表征的损伤变量d随冲击速度呈弱幂函数增加关系d=-0.11v~2+1.31v-3.01,损伤变量值越大,节理岩石破坏程度越高.
A similar Hopkinson pressure bar test was applied to jointed jointed rock with similar material model. By setting different joint thicknesses and loading velocities, the change law of dynamic compressive strength of rock and corresponding failure modes under impact loading were studied. The effect of joint thickness on stress And the influence of energy dissipation on the wave propagation through the joint, the law of rock damage is characterized from the energy point of view. The results show that the dynamic compressive strength of jointed rock decreases gradually with the increase of the thickness of filled rock, However, the existence of joint medium will affect the degree of rock failure, and the change of joint thickness will lead to the corresponding unilateral damage. Under the same incident energy condition, the larger the thickness of filling joint, the stronger the rock’s reflection ability, the attenuation amplitude of transmitted wave The larger the energy dissipation, the more the energy and the energy dissipation. The incident energy and the reflection energy of the jointed rock increase with the increase of the impact velocity, and the transmission energy first increases and then decreases. The damage variable d Weak power function increases the relationship d = -0.11v ~ 2 +1.31v-3.01, the greater the damage variable value, the higher the degree of rock destruction.