岩土力学2011，Vol.32Issue(10)：2922-2928,7.
不同应力路径下水土耦合超固结黏土分叉分析
Bifurcation analysis of overconsolidated clays with soil-water coupling along different stress paths
摘要
Abstract
Based on a three-dimensional elastoplastic constitutive model, for overconsolidated clays, an acoustic tensor and discriminator of bifurcation for strain localization under partially drained conditions are given. The analytical and numerical solutions to the model along different stress paths are resolved. The theoretical analysis shows that, there is no bifurcation occurring at the Lode anglesθσ of -30°, 15°and 30° for both single-phase and soil-water coupling two-phase materials. At the Lode angle of 0°, the bifurcation occurs for the single-phase and doesn't occur for the soil-water coupling under undrained condition; while whether bifurcation occurs is related to the parameter under partially drained condition. There is bifurcation occurring at the Lode angle of-15 ° for both the single-phase and soil-water coupling. Numerical simulations on a cubic specimen for the bifurcation for the single-phase and soil-water coupling are carried out by use of a nonlinear finite element analysis software ABAQUS with the model being implemented. The numerical analysis shows that, there is no bifurcation occurring at the Lode angles of ± 30° for both single-phase and soil-water coupling. At the Lode angle of 15°, bifurcation occurs for the single-phase and doesn't occur for the soil-water coupling under undrained condition; while the time when bifurcation occurs is related to the permeability under partially drained condition. There is bifurcation occurring at the Lode angles of -15° and 0° for both the single-phase and soil-water coupling. Bifurcation of numerical solutions is more likely to occur than that of analytical solutions along the same stress paths.关键词
超固结土/本构模型/部分排水/分叉/数值模拟Key words
overconsolidated clay/ constitutive model/ partially drained condition/ bifurcation/ numerical simulation分类
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陈立文,孙德安..不同应力路径下水土耦合超固结黏土分叉分析[J].岩土力学,2011,32(10):2922-2928,7.
