| 超固结土模型平面应变分叉理论解与数值模拟 |
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| 引用本文： | 孙德安,段博,甄文战. 超固结土模型平面应变分叉理论解与数值模拟[J]. 上海大学学报(自然科学版), 2011, 17(3): 307-313. DOI: 10.3969/j.issn.1007-2861.2011.03.019 |
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| 作者姓名： | 孙德安 段博 甄文战 |
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| 作者单位： | 上海大学 土木工程系，上海 200072 |
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| 基金项目： | 教育部博士点基金资助项目(20093108110017) |
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| 摘 要： | 应变局部化理论最基本的问题在于局部化分叉产生的条件.针对基于伏斯列夫面超固结黏土三维弹塑性本构模型，推导平面应变条件下局部化分叉理论解及因局部化分叉而产生的剪切带倾角的表达式，并分析不同超固结比对局部化分叉理论解和剪切带倾角的影响.理论分析表明，在平面应变条件下，土体局部化分叉出现在应力应变硬化阶段，剪切带倾角在分叉前随着应变局部化的扩张发生显著变化，在分叉后趋于稳定.最后，利用非线性有限元软件ABAQUS，在平面应变应力路径下对均匀各向同性多单元立方体局部化分叉现象进行数值分析，得出的局部化分叉数值解与理论解较为一致，验证了理论解的可靠性.
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| 关 键 词： | 本构模型 分叉 理论解 平面应变 数值模拟 |
| 收稿时间： | 2010-01-08 |
Analytical Solution and Numerical Simulation for Plane Strain Bifurcation in Constitutive Model for Over-Consolidated Clays |
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| SUN De-an,DUAN Bo,ZHEN Wen-zhan. Analytical Solution and Numerical Simulation for Plane Strain Bifurcation in Constitutive Model for Over-Consolidated Clays[J]. Journal of Shanghai University(Natural Science), 2011, 17(3): 307-313. DOI: 10.3969/j.issn.1007-2861.2011.03.019 |
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| Authors: | SUN De-an DUAN Bo ZHEN Wen-zhan |
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| Affiliation: | Department of Civil Engineering, Shanghai University, Shanghai 200072, China |
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| Abstract: | A fundamental problem concerning the theory of strain localization is the condition of the occurrence of localization bifurcation.Based on the Hvorslev envelope-based three-dimensional elastoplastic constitutive model for over-consolidated clay,an analytical solution of bifurcation and the expression of inclination angle for shear band caused by localization bifurcation are derived for strain localization in plane strain stress states.Meanwhile,influences of over-consolidation ratio(OCR) on the analytical s... |
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| Keywords: | over-consolidated clay constitutive model plane strain bifurcation analytical solution numerical simulation |
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