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为进一步揭示深部岩体受到开挖爆破等动力作用时的破坏机理,利用基于SHPB装置的动静组合加载试验系统,首次对中高应变率下矽卡岩在高静应力和频繁动力扰动共同作用时的变形特性、能量规律、破坏模式等进行了研究.随着冲击次数的增加,岩石的弹性模量先增大后减小,而每次冲击时的最大应变整体表现出先减小后增大的趋势,最后一次冲击时弹性模量骤降,最大应变突增,岩石试样发生破坏.单位体积岩石能耗为负值,说明在冲击动载的作用下岩石试样表现出释放能量的特性,这是由于高静应力作用产生的弹性应变能受动力冲击作用诱导而释放;随着冲击次数的增加,单位体积岩石释放的能量先增大后减小.结构致密、强度较高的矽卡岩试样随冲击次数的增加表现出劈裂破坏模式.
In order to further reveal the failure mechanism of deep rock mass subjected to dynamic action such as excavation blasting and so on, the static and dynamic loading test system based on SHPB device is applied. For the first time, when the high static stress and frequent dynamic disturbances of skarn at medium and high strain rates Deformation characteristics, energy laws, failure modes, etc. With the increase of impact times, the elastic modulus of rock first increases and then decreases, while the maximum strain per impact decreases first and then increases , The elastic modulus suddenly dropped at the time of the last impact, the maximum strain suddenly increased, the rock sample was damaged, and the energy consumption per unit volume of rock was negative, indicating that the rock specimen showed the property of releasing energy under impact load The elastic strain generated by the high static stress can be released by the impact of the dynamic impact, and the energy released per unit volume of rock first increases and then decreases with the increase of the number of impacts. The compact and high strength skarn test With the increase in the number of impact shows the splitting failure mode.