| 考虑各向异性的软黏土扰动状态本构模型 |
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| 引用本文： | 于小军,施建勇,徐杨斌.考虑各向异性的软黏土扰动状态本构模型[J].岩土力学,2009,30(11):3307-3312. |
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| 作者姓名： | 于小军 施建勇 徐杨斌 |
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| 作者单位： | 1. 河海大学 岩土力学与堤坝工程教育部重点实验室，南京 210098；2. 盐城工学院 土木学院，江苏 盐城 224003 |
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| 基金项目： | 江苏省自然科学基金项目 |
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| 摘 要： | 以大量试验结果为依据，运用物理意义明确、获取简便快捷、经济实用的土电阻率结构指标进行软黏土扰动变量的表征和测定。以三轴试验与电阻率测试结果为基础，进行了扰动函数的构建。在软黏土扰动状态描述中，引入旋转硬化因子，用以考虑应力诱发各向异性，进而构建了考虑各向异性的软黏土扰动状态概念本构模型。模型从一定程度上克服了传统扰动变量获取方法的弊端，克服了传统借用数学演绎手段建立扰动函数的不足，提高了模型应用的适用性。在模型构建中，融入初始应力各向异性的影响，从而使模型能更好地反映软土实际工程情况。三轴排水剪切试验验证结果表明，该模型可较好反映软黏土受荷下的结构变化情况和受力特性。
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| 关 键 词： | 软黏土 电阻率指标 各向异性 扰动状态概念 本构模型 |
| 收稿时间： | 2009-02-23 |
Modelling disturbed state and anisotropy of natural soft clays |
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| YU Xiao-jun,SHI Jian-yong,XU Yang-bin.Modelling disturbed state and anisotropy of natural soft clays[J].Rock and Soil Mechanics,2009,30(11):3307-3312. |
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| Authors: | YU Xiao-jun SHI Jian-yong XU Yang-bin |
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| Institution: | 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. School of Civil Engineering, Yancheng Institute of Technology, Yancheng 224003, China |
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| Abstract: | Based on tests, electrical resistivity indexes are taken to reflect the changes in soil structures and define the disturbed variable, which is convenient, continuous, economical and practicable. Meanwhile, disturbed function is built by the results of undrained triaxial shear tests and electrical resistivity tests. Additionally, rotational hardening parameter is taken to describe disturbed state of natural soft clays; accordingly, a disturbed state concept constitutive model taking into account stress-induced anisotropy for soft clays is presented. As a result, the traditional methods measuring disturbed variable and establishing disturbed function may be optimized, and the applicability and accuracy of model may be improved. Results from undrained triaxial shear tests show that the model can describe the stress-strain characteristics fairly well and could be applied to practice. |
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| Keywords: | soft clay electrical resistivity index anisotropy disturbed state concept constitutive model |
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