动荷载下峰后破裂砂岩能量耗散特征研究

采用霍普金森压杆(SHPB)实验装置对经静态压缩制备的峰后破裂砂岩进行单轴冲击试验。基于SHPB试验能量理论,研究峰后破裂砂岩在动态破坏过程中的能量耗散特征,并与完整砂岩进行对比分析。研究结果表明:动荷载作用下峰后破裂砂岩单位体积吸收能与入射能呈线性关系,且峰后破裂砂岩单位体积吸收能对入射能的敏感性低于完整砂岩;峰后破裂砂岩的破坏形态与试样吸收能量的大小相关,且存在一个吸收能量值使得峰后破裂砂岩和完整砂岩破坏程度的相对性发生改变。

Research on energy dissipation property of post-peak cracked sandstone under dynamic loading

The uniaxial impact compression experiments on post-peak cracked sandstone samples by using of split Hopkinson pressure bar (SHPB) apparatus. On the basis of energy theory in split Hopkinson pressure bar(SHPB) test, the energy dissipation characteristics of post-peak cracked sandstone were studied and compared with intact sandstone samples during the dynamic failure process. The test results show that energy absorption per unit volume of post-peak cracked sandstone has a linear relationship with incident energy, and the sensitivity of energy absorption per unit volume of post-peak cracked sandstone to incident energy is lower than that of intact sandstone under dynamic loading. The failure pattern of post-peak cracked sandstone samples were related to the energy absorbed of sample, and there exists an energy absorption value that changes the relativity between the damage degree of post-peak cracked sandstone and intact sandstone.