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Transient mechanical wave propagation in semi-infinite porous media using a finite element approach

机译:使用有限元方法在半无限多孔介质中进行瞬态机械波传播

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摘要

In this study, we propose a numerical investigation in the time domain of the mechanical wave propagation of an impulsional load on semi-infinite soil. The ground is modelled as a porous saturated viscoelastic medium involving complete Biot theory. All the couplings and a hysteretic Rayleigh damping are taken into consideration. An accurate and efficient finite element method using a matrix-freer technique and an expert multigrid system are applied. Our results present the displacements of the fluid and solid particles over the surface and in depth. The arrival times of body and surface waves are studied. Particularly, the compressional wave of the second kind is highlighted. The influence of the different couplings and more specifically, the influence of the permeability on the response of the soil are analyzed.
机译:在这项研究中,我们建议在半无限土壤上施加脉冲载荷的机械波传播的时域进行数值研究。将地面建模为涉及完整毕奥理论的多孔饱和粘弹性介质。考虑了所有的联轴器和滞回瑞利阻尼。应用了一种精确有效的利用无矩阵技术的有限元方法和专家级多重网格系统。我们的结果显示了流体和固体颗粒在表面和深度上的位移。研究了体波和面波的到达时间。特别地,突出了第二种压缩波。分析了不同耦合的影响,更具体地说,渗透率对土壤响应的影响。

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