CAJ | 학술논문

从流变力学角度建立的离散介质本构关系同时考虑了介质的弹性、粘性与弱化性,与损伤力学建立的本构关系比较表明弱化因子具有损伤因子的力学意义.本文采用交错网格伪谱法正演模拟了离散介质中波的传播,并以平面波解分析了体波的频散和介质的吸收系数.高频和低频情况下波场数值模拟的结果是:饱和多孔介质中体波速度随弱化因子的增加而降低,介质吸收系数随弱化因子的增加而增加,弱化性对不同体波频散的影响程度不同.
종류변역학각도건립적리산개질본구관계동시고필료개질적탄성、점성여약화성,여손상역학건립적본구관계비교표명약화인자구유손상인자적역학의의.본문채용교착망격위보법정연모의료리산개질중파적전파,병이평면파해분석료체파적빈산화개질적흡수계수.고빈화저빈정황하파장수치모의적결과시:포화다공개질중체파속도수약화인자적증가이강저,개질흡수계수수약화인자적증가이증가,약화성대불동체파빈산적영향정도불동.
The elasticity, viscosity, and weakness properties are taken into account in the relationships derived from rheology mechanics. Comparing with the corresponding relationships derived from damage mechanics, we find the weakness factor has the same significance as the damage factor. We simulate the wave field using a staggered-grid pseudospectral method to show the influence of the weakness factor qualitatively. Applying the analytical solution of plane waves, we give the velocity and attenuation coefficient of three body waves, which are affected by the wave frequency and the weakness factor of saturated discrete media. Our results show that velocity decreases with increasing weakness factor,the attenuation coefficient increases with an increase in the weakness factor, and that the influence of weakness depends on the mode of the body waves.