基于修正g-λ模型的应力P波在节理岩体中的传播衰减研究OA

The attenuation of stress waves caused by the reflection and transmission of stress waves in jointed rock masses under in-situ stress has not been well solved so far.Based on the coupled normal stress-closure constitutive model of joints,namely the modified g-λ model(0＜λ＜1),in which the pa-rameter λ reflects the joint weathering degree and the matching degree of joint walls.On the basis of the finite difference method,the particle velocity formulas of transmitted stress waves across single joint and multiple joints are derived by using the modified g-λ model.Through parameter analysis,the influence of various parameters on the attenuation law of transmitted waves is investigated.The results show that for half-sine incident waves,the amplitude of transmitted stress waves increases with the rise of λ value,cor-responding to weaker joint weathering.When the λ value remains constant,the transmitted wave amplitude rises with the increase of joint spacing and joint stiffness.When in-situ stress is taken into account,the transmitted waves increase with the growth of in-situ stress and λ value.The research conclusions further expand the application scope of the g-λ model.