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作 者:陈鹏 CHEN Peng(China Railway 19th Bureau Group Mining Investment Co.,Ltd.,Beijing 100071,China)
机构地区:[1]中铁十九局集团矿业投资有限公司,北京100071
出 处:《资源信息与工程》2025年第1期67-72,共6页Resource Information and Engineering
摘 要:为研究动态扰动及高水压作用下矿山巷道围岩的变形破坏机制,利用改进的霍普金森压杆试验系统,对该矿山巷道砂岩进行相同冲击荷载下不同轴向静应力和不同水压的冲击试验,分析不同试验条件下砂岩的动态破坏特性。结果表明:随着水压力逐渐增大,反射波表现为先升再降而后逐渐稳定,透射波表现为先升而后逐渐稳定,能量反射率表现为先降而后趋于平缓,能量透射率逐渐增大;随着水压力不断增大,岩石波阻抗有所增强,但增势减缓;随着轴向静应力逐渐增大,反射波幅值逐渐增大,透射波幅值逐渐减小,波阻抗逐渐减小,能量透射率逐渐减小,能量耗散率逐渐递增。In order to study the deformation and failure mechanism of mining tunnel surrounding rock under the action of dynamic disturbance and high water pressure,the improved Hopkinson pressure bar test system was used to carry out impact tests on the tunnel sandstone under the same impact load with different axial static stress and different water pressure,and analyzed the dynamic failure characteristics of sandstone under different test conditions.The results show that with the gradual increase of water pressure,the reflected wave rises first and then falls and then becomes stable,the transmitted wave rises first and then becomes stable,the energy reflectivity decreases first and then flattens,and the energy transmittance increases gradually.With the increasing of water pressure,the wave impedance of rock increases,but the momentum of the increase is slowed down.With the axial static stress increasing gradually,the amplitude of the reflected wave increases gradually,the amplitude of the transmitted wave decreases gradually,the wave impedance decreases gradually,the energy transmittance decreases gradually,and the energy dissipation rate increases gradually.
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