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首页> 外文学位 >TRANSIENT POREWATER PRESSURE RESPONSE AND LIQUEFACTION IN A SATURATED SAND (SOIL DYNAMICS, BLASTING, EXPLOSIVE LOADING, BLAST-INDUCED, SHOCK LOADING)
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TRANSIENT POREWATER PRESSURE RESPONSE AND LIQUEFACTION IN A SATURATED SAND (SOIL DYNAMICS, BLASTING, EXPLOSIVE LOADING, BLAST-INDUCED, SHOCK LOADING)

机译：饱和砂土中的瞬时水压力响应和液化（土壤动力学，爆破，爆炸荷载，爆炸诱发，冲击荷载）

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摘要

A new experimental apparatus has been developed to investigate the transient and long-term porewater pressure response of saturated soils. The facility is capable of generating compressive shock loadings on the order of 35000 KPa with millisecond rise times to peak stress. This experimental investigation represents an effort to examine and establish an understanding of compressionally-induced liquefaction.;Samples of water saturated Monterey No. 0/30 sand were examined at various relative densities and effective stresses. Boundary conditions used for the experiments were one-dimensional, confined, compressive loadings without drainage. Results indicate that it is possible to liquefy Monterey No. 0/30 sand under these conditions. Significant porewater pressure increases were possible even at high densities and high effective stresses. Liquefaction was generally observed at compressive strains greater than about 1 x 10('-1) percent. Threshold strain values, below which substantial porewater pressures increases generally did not occur, were about 1 x 10('-2) percent.;The data analysis has provided several empirical models that can be used to estimate liquefaction potential as a function of density, effective stress and applied compressive strain. One of the models uses an empirical scaling law for explosive loadings to predict the extent of porewater pressure increases in the field from buried, contained charges in saturated soils.;A finite difference analysis that considers the saturated soil as a two-phase medium has been performed. The analysis accounts for the nonlinear, inelastic behavior of the soil skeleton and has shown that liquefaction is dependent upon the unloading constrained modulus of the soil. Results agree with the experimental observations of peak and long-term porewater pressure responses.
机译：已经开发出一种新的实验设备来研究饱和土壤的瞬态和长期孔隙水压力响应。该设备能够产生35000 KPa左右的压缩冲击载荷，并且上升时间达到峰值应力的时间为毫秒。这项实验研究代表着努力检查和建立对压缩诱发的液化的理解。在不同的相对密度和有效应力下检查了饱和的蒙特雷0/30号水砂样品。实验所用的边界条件是一维，密闭且无排水的压缩载荷。结果表明在这些条件下可以将蒙特雷0/30号砂土液化。即使在高密度和高有效应力下，孔隙水压力也会显着增加。通常在大于约1×10（'-1）％的压缩应变下观察到液化。阈值应变值大约没有发生在其以下，该阈值应变不会使孔隙水的压力大幅度增加，而是大约为1 x 10（'-2）％。数据分析提供了一些经验模型，可以用来估计液化潜力随密度的变化，有效应力和施加的压缩应变。其中一个模型对爆炸载荷使用经验标度定律来预测饱和土中埋藏的含电电荷在田间孔隙水压力增加的程度;有限差分分析将饱和土视为两相介质。执行。该分析说明了土壤骨架的非线性，非弹性行为，并表明液化取决于土壤的卸荷约束模量。结果与峰值和长期孔隙水压力响应的实验观察结果一致。

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  • 作者

    VEYERA, GEORGE EDWARD, JR.;

  • 作者单位

    Colorado State University.;

  • 授予单位 Colorado State University.;
  • 学科 Civil engineering.
  • 学位 Ph.D.
  • 年度 1985
  • 页码 220 p.
  • 总页数 220
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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