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为了探索突出煤在冲击载荷作用下的破坏变形特征和动态本构关系,采用75mm分离式霍普金森压杆(SHPB)对淮南矿区B6煤层突出煤进行了不同冲击速度下的单轴冲击压缩实验,并结合现有的岩石类材料的本构模型,构建了反映突出煤动态力学特性的本构方程。研究结果表明:突出煤在冲击载荷作用下的破坏变形过程大体可概括为初始非线性阶段、屈服阶段、应变强化阶段和卸载破坏阶段4个阶段;所构建的包含损伤效应和应变率效应的动态本构方程能较好地反映突出煤在峰值应力前的动态应力应变关系。
In order to explore the failure characteristics and dynamic constitutive relations of coal under impact load, 75mm split Hopkinson pressure bar (SHPB) was used to compress the uniaxial impacting of outburst coal of B6 seam in Huainan mining area under different impact velocities Based on the experiment and the existing constitutive models of rock-like materials, a constitutive equation reflecting the dynamic mechanical properties of the outburst coal has been established. The results show that the failure process of the overheat coal under impact load can be generalized to four stages: the initial nonlinear stage, the yield stage, the strain strengthening stage and the unloading failure stage. The dynamics including damage effect and strain rate effect The constitutive equation can well reflect the dynamic stress-strain relationship of the protruding coal before the peak stress.