Purpose

The purpose of this paper is to investigate propagation characteristics of seismic waves at the welded interface of an elastic solid and unsaturated poro-thermoelastic solid.

Design/methodology/approach

A theoretical formulation of partially saturated poro-thermoelastic solid is used in this study established by Zhou et al. (2019). The incidence of two primary waves (P and SV) is taken. The incident wave from the elastic solid induces two reflected waves and five refracted waves. Due to viscous pore fluids, partially saturated poro-thermoelastic solid behave dissipative, whereas elastic solid behaves non-dissipative. As a result, both reflected and incident waves are homogeneous. However, all the refracted waves are inhomogeneous. A non-singular system of linear equations is formed by the coefficients of reflection and refraction for a specified incident wave. The energy shares of various reflected and refracted waves are determined by using these reflection and refraction factors. Finally, a sensitivity analysis is performed, and the effect of critical variables on energy partitioning at the interface is observed. The numerical example shows that throughout the process of reflection/refraction, the energy of incidence is conserved at all angles of incidences.

Findings

This study demonstrated two refracted (homogeneous) and five refracted (inhomogeneous) waves due to the incident wave from elastic solid. The reflection and refraction coefficients and partitioning of incident energy are acquired as a part of diverse physical parameters of the partially saturated poro-thermoelastic media. The interference energies between unlike pairs of refracted waves have been discovered due to the dissipative behavior of unsaturated poro-thermoelastic solid.

Originality/value

The sensitivity of different energy shares to various aspects of the considered model is graphically analyzed for a specific numerical model. The energy balance is maintained by combining interaction energy and bulk wave energy shares.

中文翻译：

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弹性固体和不饱和多孔热弹性固体焊接界面处的波传播

目的

本文的目的是研究地震波在弹性固体和不饱和多孔热弹性固体焊接界面处的传播特性。

设计/方法/方法

Zhou等人在本研究中使用了部分饱和多孔热弹性固体的理论公式。（2019）。采用两个主波（P 和 SV）的入射。来自弹性固体的入射波产生两个反射波和五个折射波。由于粘性孔隙流体，部分饱和的孔隙热弹性固体表现为耗散，而弹性固体表现为非耗散。因此，反射波和入射波都是均匀的。然而，所有的折射波都是不均匀的。由指定入射波的反射系数和折射系数形成非奇异线性方程组。通过使用这些反射和折射因子来确定各种反射和折射波的能量份额。最后，进行了敏感性分析，并观察了关键变量对界面能量分配的影响。

发现

这项研究表明，由于来自弹性固体的入射波，产生了两个折射（均匀）波和五个折射（不均匀）波。作为部分饱和多孔热弹性介质的不同物理参数的一部分，获得了反射和折射系数以及入射能量的分配。由于不饱和多孔热弹性固体的耗散行为，已经发现了不同对折射波之间的干涉能。

原创性/价值

针对特定数值模型，以图形方式分析不同能量份额对所考虑模型的各个方面的敏感性。通过结合相互作用能量和体波能量份额来维持能量平衡。