In this study, a linear poroviscoelastic model based on the Biot theory is proposed to analyze the dynamic response of partially saturated soil. Both the flow‐dependent and flow‐independent poroviscoelastic behaviors are described in the proposed model. The compressibilities of both the constituents, including the skeleton material and porefluid, are considered, and the effective skeleton stress is determined using the linear viscoelasticity law based on the generalized spring‐dashpot model. The soil surface is subjected to two types of harmonic loading, namely, vertical compressive loading and lateral shear loading. The influences of the relaxation time, saturation degree, and soil permeability on the surface and interior dynamic responses of the soil layer are investigated. It is revealed that the amplification factor, effective stress, and pore pressure decrease as the viscous damping increases, indicating that neglecting the viscoelastic property of solid skeleton could overestimate the induced dynamic responses. Furthermore, in comparison with the viscous damping of the solid skeleton, the viscous coupling involving the viscous resisting forces between the solid skeleton and pore fluid has limited effect on the dynamic behavior of the soil layer.

中文翻译：

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循环荷载作用下多孔黏弹性土层的频率相关动力特性

在这项研究中，基于Biot理论的线性多孔弹性模型被提出来分析部分饱和土的动力响应。所提出的模型都描述了与流动无关和与流动无关的孔隙弹性行为。考虑了包括骨架材料和孔隙流体在内的两种成分的可压缩性，并基于线性弹簧-弹性点模型，使用线性粘弹性定律确定了有效骨架应力。土壤表面承受两种类型的谐波载荷，即垂直压缩载荷和横向剪切载荷。研究了松弛时间，饱和度和土壤渗透率对土层表面和内部动力响应的影响。结果表明，放大因子，有效应力，孔隙压力随着粘性阻尼的增加而降低，表明忽略固体骨架的粘弹性可能会高估诱导的动力响应。此外，与固体骨架的粘性阻尼相比，涉及固体骨架和孔隙流体之间的粘性阻力的粘性耦合对土壤层的动力行为具有有限的影响。