【摘要】 土坡和挡土墙的应变局部化和渐进破坏分析的一个关键问题是如何合理描述土体分叉后的力学性状,而从试验得到的峰后应力应变关系实际上并不是土体本身的一种真实本构反应。为此,提出了一种描述含剪切带土体宏观力学特性的改进后的复合体理论(或均匀化理论)。结合干密砂以及饱和松砂、中密砂、密砂的平面应变试验结果,验证了该理论框架的合理性。更多还原

【Abstract】 One of the key issues encountered in the strain localization and progressive failure analyses of slopes and retaining structures is how to describe properly the post-bifurcation response of soils. It has been found that the soil response measured globally in biaxial and triaxial tests may not be a unique material property of soils. It is therefore imperative to understand the post-bifurcation behavior of soils and to correctly simulate this behavior within a suitable mathematic framework. In this paper, the mechanical behavior of saturated soils in the localized mode is estimated through a homogenization technique and the average mechanical properties of a medium are intercepted by a shear band. Numerical predictions of plane strain compression of drained loose sand, untrained loose, medium dense and dense sands are in good agreement with the available biaxial test results.更多还原