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选用三参数标准线性固体作为岩石本构,提出了一种考虑岩体黏弹性的位移不连续模型;根据一维黏弹性波的特征线法,推导了节理处质点速度、应力和应变递推公式。首先,基于分离式霍普金森压杆(SHPB)对砂层进行试验,得到其应力-应变关系,并换算出砂层节理的法向刚度;接着,通过一维强间断黏弹性波的波速公式、高频波衰减系数以及任一频率下的衰减系数,确定出数值算法中的三参数。最后,基于自制的摆锤装置,探讨了一维应力波在节理岩体中的传播规律,试验中以两根长1 000 mm、直径为68.50 m的岩杆作为入射和透射杆,以3 mm砂层模拟节理。试验和数值结果吻合度良好,进一步验证了该方法的可靠性。
A three-parameter linear solid is selected as the rock constitutive model. A discontinuous discontinuity model considering the viscoelasticity of rock mass is proposed. According to the one-dimensional viscoelastic wave characteristic line method, the mass velocity, stress and strain recursion formulas . First, the sand layer is tested based on the split Hopkinson pressure bar (SHPB), and the stress-strain relationship is obtained and the normal stiffness of the sand layer joint is converted. Then, by the wave velocity formula of strong discontinuous viscoelastic wave , The high-frequency wave attenuation coefficient and the attenuation coefficient at any frequency to determine the three parameters in the numerical algorithm. Finally, based on the self-made pendulum device, the propagation of one-dimensional stress wave in jointed rock mass was discussed. Two rock rods with a length of 1000 mm and a diameter of 68.50 m were used as the incident and transmission rods, Sand simulation joint. The good agreement between the experimental and numerical results verifies the reliability of this method.