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首页> 外文会议>U.S. Rock Mechanics/Geomechanics Symposium >Bonded particle-finite element simulation of rock in Split Hopkinson Pressure Bar test
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Bonded particle-finite element simulation of rock in Split Hopkinson Pressure Bar test

机译：拆分升降杆试验中岩石的粘结粒子有限元模拟

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Dynamic uniaxial compressive strength of Pennsylvania blue sandstone was investigated using split Hopkinson pressure bar both physically and numerically. A hybrid finite-discrete element code called CA3 was employed to simulate the physical tests. The incident and transmitted bars were modeled using finite elements while the rock specimen was represented by a bonded particle discrete system. The incident stress pulse measured in the physical test was utilized as the input for the numerical simulation and was applied to the free end of the incident bar. Analysis of the numerical results suggests an underestimation of the dynamic rock strength; the effect of axial and circumferential inertia of the specimen didn’t manifest the strength value consistent with the physical observation. Therefore, a parameter called rock strength enhancement coefficient was introduced which increases the bond strength between the particles as a function of the relative velocity of particles at the contact points. A much better match between the physical and numerical results is observed if this coefficient is applied in the numerical simulation.
机译：使用分裂的Hopkinson压力棒在物理上和数值上研究了宾夕法尼亚蓝砂岩的动态单轴抗压强度。使用称为CA3的混合有限离散元件代码来模拟物理测试。使用有限元素建模的入射和传输的条，而岩石样本由粘合颗粒离散系统表示。在物理测试中测量的入射应力脉冲用作数值模拟的输入，并应用于入射杆的自由端。分析数值结果表明，低估了动态岩体强度;标本轴向和周向惯性的影响并不表现出与物理观察一致的强度值。因此，引入了称为岩体强度增强系数的参数，其随着颗粒之间的函数在接触点处的相对速度的函数增加。如果在数值模拟中应用该系数，则观察到物理和数值结果之间的更好匹配。

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