弹性半空间-理想流体层中Stoneley波的动力特性

Dynamic Properties of Stoneley Wave in Elastic Half-Space-Ideal Fluid Layer

为了解弹性半空-理想流体层中Stoneley波的动力特性,并为进一步开发利用海洋资源提供调查方法,根据弹性固体与理想流体动力学方程,推导了弹性半空间-理想流体层中Stoneley波的特征方程.基于该特征方程,分析了固液两介质的物理特性对流体动压力的影响,以及固体和流体介质的位移分布情况.结果表明,该体系中Stoneley波在固体中的位移分布类似于半空间Rayleigh波,而在流体中的位移分布有明显的规律性;弹性半空-理想流体层中Stoneley波具有频散性,且其波速小于弹性半空间中Rayleigh波的波速.

In order to reveal the dynamic properties of the Stoneley wave in elastic half-space-ideal fluid layer and further to provide a surveying method for exploring oceanic resources, a characteristic equation expressing the Stoneley wave in half-infinite solid-ideal fluid layer is derived based on the dynamic equations of elastic solid and ideal fluid. According to the proposed characteristic equation, the influences of the physical characteristics of the solid and the fluid on the dynamic pressure of the fluid are analyzed, and the displacement distribution in the solid and the fluid are described. The results show that （ 1 ） the displacement distribution of the Stoneley wave in the solid is similar to that of the Rayleigh wave in half-space, while that in the fluid is obviously regular; and （2） the Stoneley wave in elastic half-infinite solid-ideal fluid layer is dispersive, with a velocity less than that of the Rayleigh wave in elastic half-space.