Abst'/> A simplified quasi-static analysis of wave-induced residual liquefaction of seabed around an immersed tunnel
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A simplified quasi-static analysis of wave-induced residual liquefaction of seabed around an immersed tunnel

机译：波浪作用下沉管隧道周围海床残余液化的简化准静态分析

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摘要

AbstractEvaluation of wave-induced soil response is particularly important for coastal geotechnical engineers involved in the foundation design for marine structures such as immersed tunnels, breakwaters, platforms etc. In this study, a finite element model for the wave-induced soil response around an immersed tunnel is developed, in which the seabed is treated as a porous medium and characterized by Biot's consolidation equations, while the tunnel is considered as a single-phase medium and behaves under a linear elastic law. A new conceptual pore-pressure buildup model is developed to investigate the wave-induced residual liquefaction around the tunnel due to the accumulation of pore pressures under cyclic shearing. The consolidation analysis of seabed foundation under the gravitational forces including the body forces of the structure is pre-assessed and incorporated. It is demonstrated from numerical results that the development of residual pore pressure is asymmetric in nature around the tunnel, which may result in the uneven liquefaction depth and deformation in the seabed near the bottom of the tunnel, thus compromising the stability of the structure. Parametric studies show that wave-induced residual liquefaction is more likely to occur in the shallow seabed with lower relative density and permeability under the wave loading with higher wave height and longer period.Highlights•The wave-induced residual mechanism in the vicinity of immersed tunnel is investigated numerically.•The initial consolidation of seabed after the construction of tunnel is considered in the evaluation of the residual liquefaction.•Asymmetric liquefaction occurs in the seabed near the two sides of tunnel due to progressive waves.•The liquefaction distribution around tunnel is related to the characteristics of both ocean waves and backfilling soils.
机译： 摘要 评估波浪引起的土壤响应对于参与海洋结构（如沉管隧道，防波堤）基础设计的沿海岩土工程师尤其重要。在这项研究中，建立了一个关于沉管隧道周围波浪引起的土体响应的有限元模型，其中将海床视为多孔介质，并用比奥固结方程进行了表征，而隧道则被视为单相介质，其行为遵循线性弹性定律。建立了一种新的概念性孔隙压力建立模型，以研究由于循环剪切作用下孔隙压力的累积而引起的隧道周围波浪引起的残余液化。预先评估并合并了在重力作用下的海床基础固结分析，包括结构的主体力。从数值结果可以看出，隧道周围的残余孔隙压力的发展在本质上是不对称的，这可能导致液化深度不均匀以及隧道底部附近海床的变形，从而损害了结构的稳定性。参数研究表明，在波浪载荷较高，周期较长的情况下，相对密度和渗透率较低的浅海床中，波浪引起的残余液化的可能性更大。 突出显示 • 通过沉浸式隧道vicinity附近的波浪引起的残余机理进行了数值研究。 • 隧道施工后考虑海床的初步固结。剩余液化。 • 由于渐进波，隧道两侧附近的海床发生不对称液化。 • 隧道周围的液化分布与海浪和回填土的特征有关。

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  • 来源
    《Ocean Engineering》 |2018年第15期|574-587|共14页
  • 作者

    Weiyun Chen; Di Fang; Guoxing Chen; Dongsheng Jeng; JianFeng Zhu; Hongyi Zhao;

  • 作者单位

    Institute of Geotechnical Engineering, Nanjing Tech University,Griffith School of Engineering, Griffith University Gold Coast Campus;

    Institute of Geotechnical Engineering, Nanjing Tech University;

    Institute of Geotechnical Engineering, Nanjing Tech University;

    Griffith School of Engineering, Griffith University Gold Coast Campus;

    Faculty of Architectural Civil Engineering and Environment, Ningbo University;

    State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University,College of Harbor, Coastal and Offshore Engineering, Hohai University;

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  • 正文语种 eng
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  • 关键词

    Residual liquefaction; Immersed tunnel; Biot's theory; Porous seabed; Pore-pressure accumulation;

    机译：剩余液化浸没式隧道比奥理论多孔海底孔隙压力堆积;

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