多孔隙流固耦合砂岩的冲击损伤效应

Impact damage effect of porous sandstone coupling with fluid

采用分离式霍普金森压杆冲击实验系统,对流固耦合的多孔隙红砂岩试样进行了不同冲击速率下的损伤效应对比实验,得到反复冲击作用下多孔隙砂岩试件的损伤演化本构关系曲线。通过检测不同冲击速率作用前后流固耦合砂岩试样的声波速度变化和冲击损伤破坏结果,探讨多孔隙流固耦合砂岩的冲击损伤演化的主要影响因素,得出冲击损伤强度随声波速度和孔隙率的变化曲线;提出不同耦合介质和孔隙率对多孔隙砂岩冲击损伤效应的影响关系。

By using a split Hopkinson pressure bar system,the damage effects of porous sandstone specimens were experimentally investigated by considering fluid-solid coupling.The dynamic stress-strain curves of the porous sandstone specimens were obtained under the repeated impact loadings with different speeds and their acoustic wave speeds were measured before and after impact.The damage results of the sandstone specimens were analyzed and the main influencing factors were explored.The varying curves of the breaking strengths of the sandstone were obtained with acoustic wave speeds and porous ratio,respectively.And the influences of porosity and coupling media were proposed on the impact damage effects of porous sandstone.