SHEAR STRAIN DEVELOPMENT IN LIQUEFIABLE SOIL UNDER BI-DIRECTIONAL LOADING CONDITIONS
SHEAR STRAIN DEVELOPMENT IN LIQUEFIABLE SOIL UNDER BI-DIRECTIONAL LOADING CONDITIONS
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发表时间：
2002
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通讯作者：
A. Kammerer;WU Jiaer;M. Riemer;J. Pestana;R. Seed
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作者：
A. Kammerer;WU Jiaer;M. Riemer;J. Pestana;R. Seed
最近开发了一个综合测试数据库，该数据库由对蒙特利 0/30 砂的中等到高相对密度、完全饱和样品进行建模质量多向循环简单剪切测试组成。该测试程序包含了各种多向应力路径，其中包括大量以前从未检查过的应力路径。事实证明，这些测试的结果有助于形成更完整的理论，从而增强当前对液化行为的理解。这种新的三维理论极大地扩展了当前对液化行为的理解，并阐明了当前理论（主要基于单向实验室测试）可能具有误导性或不保守的一些领域。特别令人感兴趣的是孔隙压力的产生和软化、孔隙压力和应变能力之间的关系，以及中密度砂中限制大的自由流动型变形的膨胀锁定。还深入了解了初始静态剪切应力引起的复杂影响，例如倾斜的地面条件或结构的存在所施加的影响。
A comprehensive testing database composed of modeling-quality multi-directional cyclic simple shear testing on medium to high relative density, fully-saturated samples of Monterey 0/30 sand has recently been developed. This testing program incorporated a variety of multi-directional stress paths, including a large number of stress paths never before examined. Results from these tests have proven useful for enhancing current understanding of liquefaction behavior by allowing for a more complete theory to emerge. This new 3-dimensional theory greatly expands current understanding of liquefaction behavior and elucidates some areas in which current theory—which has been based principally on uni-directional laboratory testing—can be misleading or unconservative. Of particular interest are the topics of pore pressure generation and softening, the relationship between pore pressure and strain capacity, and the dilational lock-up in medium density sands that acts to limit large free-flow type deformations. Insight has also been gained on the complex effects caused by an initial static shear stress such as would be imposed by sloping ground conditions or the presence of a structure.