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Numerical simulation of liquefaction-induced deformation of embankments on non-homogeneous foundation

机译:非均质地基上液化引起路堤变形的数值模拟

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摘要

In this study, numerical analyses have been performed for a sandy embankment lying on lique-fiable non-homogeneous soil using finite element code based on extended subloading surface model (Takahashi 2002). Non-homogeneous soil deposit comprises of Toyoura sand and periodically distributed patches of less permeable layer of silty sand. Analyses were also conducted for embankments on uniform sand comprising of only Toyoura sand. It was found that excess pore water pressure (EPWP) ratio values were higher below the embankment and free field region at shallow depths in non-homogeneous foundation during shaking, manifesting large amount of crest settlement and lateral deformation of embankment. In addition, dissipation of pore water took a longer period of time, which might be incorporated by migration of pore water from underlying foundation soil toward the free field, causing an additional larger settlement of embankment and larger heave at the free field ground surface and post-liquefaction delayed failures in non-homogeneous foundation.
机译:在这项研究中,使用基于扩展分载面模型的有限元代码对液化非均质土上的砂质路堤进行了数值分析(Takahashi 2002)。非均质的土壤沉积物包括丰谷沙和周期性分布的低渗透性粉沙层的斑块。还对仅由丰谷沙组成的均匀沙进行了路堤分析。结果表明,非均质地基中,在晃动过程中,过大的孔隙水压力(EPWP)比值较高,在路堤和自由场区域以下,表现出大量的波峰沉降和路堤的侧向变形。此外,孔隙水的消散花费了较长的时间,这可能是由于孔隙水从基础地层土壤向自由田间迁移而引起的,从而导致更大的路堤沉降,并在自由田地表和桩后产生较大的沉沉-液化延迟了非均质基础中的破坏。

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  • 来源
  • 会议地点 Delft(NL)
  • 作者

    M. Maharjan; A. Takahashi;

  • 作者单位

    Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Tokyo, Japan;

    Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Tokyo, Japan;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
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