Abstract To investigate the consolidation responses of coastal rheological aquitards to tide-induced groundwater fluctuations, this study adopts a nonlinear 1-D consolidation model considering the rheological properties of the aquitard and non-Darcian flow. In this model, the depth-dependent property of the initial permeability and compressibility of the aquitard are considered using the continuous exponential functions of the vertical coordinate z. Moreover, the stress-dependent property of the permeability and compressibility during consolidation are described using the correlations of the void ratio with effective stress and permeability coefficient. The rheological nature of the aquitard is characterized with the e-log t curve for the secondary consolidation, while the flow in the aquitard is assumed to follow the exponential non-Darcian law. The numerical solutions for the model are obtained using finite volume method and Newton-Raphson iteration method. A comprehensive parametric study is conducted with regard to the mechanical and hydraulic parameters of the aquitard and its burial conditions. The analysis results reveal the generation, accumulation and oscillation mechanisms of pore pressure change and soil skeleton deformation in the aquitard. The proposed model can provide a theoretical foundation for predicting and controlling the deformation of engineering structures in coastal aquitards.

中文翻译：

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流变隔水层对沿海软沉积物中潮汐引起的地下水波动的固结响应

摘要 为了研究沿海流变隔水层对潮汐引起的地下水波动的固结响应，本研究采用了考虑隔水层和非达西流的流变特性的非线性一维固结模型。在该模型中，使用垂直坐标 z 的连续指数函数来考虑透水层的初始渗透率和可压缩性的深度相关特性。此外，利用孔隙比与有效应力和渗透系数的相关性描述了固结过程中渗透率和压缩率的应力相关特性。透水层的流变性质以二次固结的 e-log t 曲线为特征，而透水层中的流动假设遵循指数非达西定律。模型的数值解是使用有限体积法和牛顿-拉夫森迭代法获得的。对透水层的机械和水力参数及其埋藏条件进行了全面的参数研究。分析结果揭示了透水层孔隙压力变化和土壤骨架变形的产生、积累和振荡机制。该模型可为沿海隔水层工程结构变形的预测和控制提供理论依据。分析结果揭示了透水层孔隙压力变化和土壤骨架变形的产生、积累和振荡机制。该模型可为沿海隔水层工程结构变形的预测和控制提供理论依据。分析结果揭示了透水层孔隙压力变化和土壤骨架变形的产生、积累和振荡机制。该模型可为沿海隔水层工程结构变形的预测和控制提供理论依据。