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Numerical modeling of earthquake site response including dilation and liquefaction.

机译：地震现场响应的数值模拟，包括膨胀和液化。

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摘要

Soil-skeleton dilation effects (cyclic mobility) is of paramount importance in dictating the extent of shear (lateral) deformations under seismic loading conditions. The main objective of this thesis is to develop a mixed stress/strain-space constitutive model capable of modeling this phenomenon during dynamic earthquake excitation. This constitutive model is based on the original Prevost (Princeton University) stress-space plasticity theory for frictional cohesionless soils. Mainly, the following two new distinct phases of soil response were added: (i) A perfectly-plastic slip strain phase (without contraction or dilation) represented by a robust strain-space formulation, followed by (ii) a strongly dilative/contractive phase beneath the failure envelope. Applicability of numerical optimization procedures for systematic calibration of model parameters is also investigated.;The developed constitutive model is incorporated in a two dimensional finite element program CYCLIC, which implements a Biot-type soil-fluid coupled formulation. CYCLIC is employed to analyze the effect of spatial permeability variation on site liquefaction potential and the corresponding deformation patterns. A port dike retaining structure is also studied and the results are compared to other available liquefaction analysis programs. Currently, an Internet-based computational program CYCLIC 1D (http://casagrande.ucsd.edu), a one dimensional version of CYCLIC, is already available to remote users for conducting on-line seismic analysis.
机译：在指示地震荷载条件下的剪切（横向）变形程度时，土壤骨架的膨胀效应（循环迁移率）至关重要。本文的主要目的是建立一种能够模拟动态地震激发过程中这种现象的混合应力/应变空间本构模型。本构模型基于原始的Prevost（普林斯顿大学）关于无粘性土的应力-空间可塑性理论。主要增加了以下两个新的不同的土壤响应阶段：（i）以稳健的应变空间公式表示的完全塑性滑移应变阶段（无收缩或膨胀），其次是（ii）强烈的扩张/收缩阶段在故障包壳下方。还研究了数值优化程序对模型参数的系统校准的适用性。所开发的本构模型被纳入二维有限元程序CYCLIC中，该程序实现了Biot型土壤-流体耦合配方。 CYCLIC用于分析空间渗透率变化对场地液化势和相应变形模式的影响。还研究了堤坝的挡土结构，并将结果与​​其他可用的液化分析程序进行了比较。当前，基于CYCLIC的一维版本的基于Internet的计算程序CYCLIC 1D（http://casagrande.ucsd.edu）已可供远程用户用于进行在线地震分析。

著录项

  • 作者

    Yang, Zhaohui.;

  • 作者单位

    Columbia University.;

  • 授予单位 Columbia University.;
  • 学科 Geotechnology.;Engineering Civil.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 255 p.
  • 总页数 255
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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