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饱和土动力问题中,渗透系数决定了流-固耦合作用的强弱,是影响饱和土中体波传播特性的重要参数.针对渗透系数为有限值、零及无穷大3种情况,基于Zienkiewicz提出的u-w-p模型,推导获得了P1,P2和S波的波动方程及相应的名义波速.在此基础上,得到势函数表示的三类体波的波动方程的解,并结合解中各项的物理意义,给出了饱和土中波的实际传播波速及衰减系数.最后,逐一讨论了渗透系数、荷载频率、孔隙率和固相可压缩性系数对波速及其衰减特性的影响.
Saturated soil dynamic problems, the permeability coefficient determines the strength of flow-solid coupling, is an important parameter affecting the body wave propagation characteristics in saturated soils.For the three kinds of permeability coefficient is finite, zero and infinity, based on Zienkiewicz proposed uwp model, the wave equation of P1, P2 and S wave and the corresponding nominal wave velocity are deduced.On this basis, we obtain the solution of the wave equation of the three types of body wave represented by the potential function, and combine the physical meaning , The actual propagation velocity and attenuation coefficient of the waves in the saturated soil are given.Finally, the influence of the permeability coefficient, the loading frequency, the porosity and the compressibility coefficient of solid phase on the wave velocity and its attenuation characteristics are discussed one by one.