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利用改进后的直径为50mm的分离式霍普金森压杆装置,采用5种冲击气压分别对灰岩和白云岩试件沿径向进行冲击加载,对比研究了2种岩石在高应变率下的动态拉伸力学特性。试验结果表明:岩石试件在动态劈裂拉伸试验中满足应力均匀性要求;2种岩石的动态拉伸强度都随着平均应变率的提高而增加,并呈较好的幂函数关系;灰岩的动态拉伸强度对应变率的相关性高于白云岩;白云岩的变形能力强于灰岩,表现出更显著的脆性。从能量的角度分析了不同应变率下2种岩石动态性能的共同特点,有助于合理解释岩石的不同破坏形态。
By using the improved split Hopkinson pressure bar with the diameter of 50mm, the impact load of limestone and dolomite specimens was impacted by using five kinds of impact pressures respectively. The effects of two kinds of rock under high strain rate Dynamic Tensile Mechanical Properties. The experimental results show that the rock specimen meets the requirements of stress homogeneity in the dynamic splitting tensile test. The dynamic tensile strengths of the two kinds of rock specimens increase with the increasing of the average strain rate, showing a good power function. The correlation between the dynamic tensile strength of rock and strain rate is higher than that of dolomite. The deformation ability of dolomite is stronger than that of limestone, which shows more remarkable brittleness. From the energy point of view, the common characteristics of dynamic behaviors of two kinds of rocks under different strain rates are analyzed, which helps to explain the different failure modes of rocks reasonably.