冲击荷载及不同应力状态下炭质泥岩能量耗散影响程度及破坏形态研究

Research on Influence Degree of Energy Dissipation and Failure Modes of Carbonaceous Mudstone under Impact Load and Different Stress States

为研究岩石受冲击荷载及岩石所处不同应力状态条件下其各能量变化特性,对炭质泥岩进行SHPB、一维及三维动静组合试验,研究冲击荷载下岩石处于不同应力状态时破坏形态与吸收能大小之间的关系,分析不同应力状态与其所对应岩石的破坏程度规律,研究相同应力状态下,冲击荷载与各能量及吸收能表征值关系,分析相同冲击荷载下,轴压、围压与各能量及吸收能表征值的影响规律,轴围压比值、差值与各能量及吸收能表征值关系,并定义敏感因子Q为轴压、围压与各吸收能表征值拟合函数一阶导函数为其对岩石吸收能的影响程度,探究轴压与围压对吸收能的影响程度规律。

In order to study the effects of the axial pressure and confining pressure on the energy of rock under impact loads,the tests on carbonaceous mudstone were conducted with a modified threedimensional split Hopkinson pressure bar(SHPB).The main research contents include the relationship between the failure mode and the absorbed energy when the rock is in different stress states under impact load,the law of rock failure degree under different stress states and same impact load,the distribution law of incident energy,axial pressure,confining pressure and the characteristic value of each absorbed energy.The relationship between shaft confining pressure ratio,difference and characteristic values of absorption energy,and define the sensitivity factor Q as the first-order derivative function of the fitting function of the axial pressure,confining pressure and the characteristic values of the absorption energy as its degree of influence on the rock absorption energy to research the influence of the axial pressure and the confining pressure on the absorption energy.