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为研究应力波在埋入式桩板路基饱和粗颗粒夹层结构界面的反射和透射效应,以平面P波为例,结合埋入式桩板路基的结构特点,基于Biot饱和多孔介质波动理论和弹性波动理论,建立了考虑饱和粗颗粒夹层反射波叠加影响的弹性介质-饱和粗颗粒夹层-弹性介质界面效应模型;采用引入势函数的方法推导了应力波在饱和粗颗粒夹层交界面上的反射和透射系数;通过数值算例研究了不同因素对反射和透射系数的影响规律.研究结果表明:夹层厚度、孔隙率、剪切模量改变了能量在交界面上的分配关系,且表现出周期性谐振特性,孔隙率由0.2变化到0.4时,反射系数增大了约25%;剪切波的传播引起反射系数在剪切波谐振频率处震荡且受阻尼作用,渗透率及透水条件对粗颗粒夹层的反射系数影响明显.
In order to study the reflection and transmission effects of stress waves on the interface of saturated coarse granular sandwich structures embedded in embankment pile, taking the plane P wave as an example, based on the structural characteristics of buried pile slab roadbed, based on Biot saturated porous medium wave theory and elastic The elastic medium - saturated coarse-grained interlayer-elastic-medium interface effect model considering the superposition of the saturated coarse-grained sandwich reflection wave was established. The reflection and the reflection of the stress wave on the interface of the saturated coarse-grained sandwich were derived by introducing the potential function The influence of different factors on the reflection and transmission coefficients was studied by numerical examples.The results show that the thickness, porosity and shear modulus change the distribution of energy at the interface and show the periodicity Resonance characteristics, the porosity changes from 0.2 to 0.4, the reflection coefficient increased by about 25%; shear wave propagation causes the reflection coefficient at the resonant frequency of shear wave oscillation and damping effect, permeability and permeability of coarse particles The reflection coefficient of the interlayer has a significant effect.