饱和度对波在土层交界面的反射、透射系数的影响

INFLUENCE OF WATER SATURATION ON SEISMIC REFLECTION AND TRANSMISSION COEFFICIENTS AT A MAINLY WATER-SATURATED POROUS SOIL INTERFACE

摘要:

把均匀流体概念引入Biot两相多孔介质动力理论中,用Biot的两相多孔介质模型模拟不完全饱和土层,给出SV波、P波从不完全饱和土层入射到弹性土层时,在土层交界面上反射、透射系数的表达式.结果表明与完全饱和相比,饱和度发生很小的变化就会对交界面上反射、透射系数产生很大的影响.今后应该重视饱和度变化对地震动力响应的影响.

Abstract:

Based on the concept of homogeneous pore fluid and Biot's theory of two-phase media, and using the model of Biot's theory to imitate imperfect saturated porous soil, the theoretical formulation of reflection and transmission coefficients at an interface between imperfect saturated porous soil and ordinary elastic soil for propagation of P wave and SV wave is developed. Numerical results show that only small difference in degrees of saturation may produce substantial influence on the coefficients at interface. The study suggests that we may carefully pay attention to the influence of water saturation on the dynamic analysis of seismic wave.