液化
岩土工程
剪切(物理)
膨胀的
可塑性
本构方程
孔隙水压力
单调函数
临界状态土力学
刚度
地质学
剪应力
屈服面
三轴剪切试验
覆岩压力
剪切(地质)
材料科学
结构工程
工程类
有限元法
数学
复合材料
数学分析
作者
Ming Yang,Mahdi Taiebat,Yannis F. Dafalias
出处
期刊:Geotechnique
[Thomas Telford Ltd.]
日期:2022-03-01
卷期号:72 (3): 227-246
被引量:60
标识
DOI:10.1680/jgeot.19.p.363
摘要
A new constitutive model for sand is formulated by incorporating two new constitutive ingredients into the platform of a reference critical state compatible bounding surface plasticity model with kinematic hardening, in order to address primarily the undrained cyclic response. The first ingredient is a memory surface for more precisely controlling stiffness affecting the plastic deviatoric and volumetric strains and ensuing excess pore pressure development in the pre-liquefaction stage. The second ingredient is the concept of a semifluidised state and the related formulation of stiffness and dilatancy degradation, aiming at modelling large shear strain development in the post-liquefaction stage. In parallel, a modified flow rule aimed at providing a better description of non-proportional monotonic and cyclic loading is introduced. With a single set of constants, for which a detailed calibration procedure is provided, this new model successfully simulates undrained cyclic torsional and triaxial tests with different cyclic stress ratios, separately for the pre- and post-liquefaction stages, as well as liquefaction strength curves based on [Formula: see text] and shear strain criteria for initial liquefaction. The successful reproduction of the sand element response under undrained cyclic shearing contributes to future applications in realistic and thorough seismic site response analysis.
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