节理走向角度对弹性纵波波速衰减的影响研究

Effect of Joint Angle of Strike on Wave Velocity Attenuation of Elastic P-wave

针对弹性波穿过节理时的衰减现象,研究节理走向角度对弹性纵波波速衰减的影响。充分考虑岩体自身的各向异性,设计更合理的试验方案来探究波速的衰减规律。结果表明,岩体的各向异性会导致纵波波速也存在各向异性,不同岩性下波速差异值有所不同,在探究节理走向角度对波速衰减的影响时应考虑此因素;当充分考虑到这一影响时,不论节理走向角度如何,其存在均对弹性纵波波速有着一定的衰减作用,且波速随节理走向角度的增大而线性递减。

In view of the attenuation phenomenon of elastic wave traveling through the rock joints,the influence of joint angles on the attenuation of elastic P-wave velocity was discussed.On the premise of fully considering and eliminating the influence of the anisotropy of rock mass on the existence of wave velocity,a more reasonable experiment is designed to analyze the attenuateon law of wave velocity.The results show:The anisotropy of rock mass leads to the anisotropy of elastic P-wave velocity,and the difference value of wave velocity under different lithologies is different.This factor should be considered when studying the influence of joint angles of strike on wave velocity attenuation.When the influence of anisotropy of rock mass on wave velocity is fully considered,its existence has a certain attenuation effect on the elastic P-wave velocity regardless of joint angles,and the wave velocity will decrease linearly with the increase of joint angles.