REFLECTION AND TRANSMISSION OF ELASTIC WAVE AT THE INTERFACE OF NEARLY SATURATED SOIL AND ELASTIC SOIL
弹性波在准饱和土和弹性土界面的反射与透射

The calculation formulas for the wave velocities of P1 wave (fast compressional wave), P2 wave (slow compressional wave) and S wave were derived from continuity of deformation and equilibrium conditions and considering the compression of soil grains and pore fluid. According to Snell theorem, the reflection and transmission of incident plane P1 wave from the nearly saturated soil at the interface of elastic soil was studied, and curves of reflection coefficients, transmission coefficients, stresses and displacements of the interface were numerically obtained. The results show that the saturated degree is an important factor that affects the reflection and transmission. The reflection coefficients, transmission coefficients, stresses and displacements change little when the saturated degree increases by 4% from 95% to 99%, but they change obviously when the saturated degree increases by only 1% from 99% to 100%.