| 考虑含水率影响的结构性黄土临界状态模型 |
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| 引用本文： | 侯乐乐,翁效林,李林,周容名.考虑含水率影响的结构性黄土临界状态模型[J].岩土力学,2022,43(3):737-748. |
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| 作者姓名： | 侯乐乐 翁效林 李林 周容名 |
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| 作者单位： | 1. 长安大学 公路学院，陕西 西安 710064；2. 长安大学 特殊地区公路工程教育部重点实验室，陕西 西安 710064 |
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| 基金项目： | 中国博士后面上基金项目（No.2021M692742）；;国家自然科学基金（No.U1934213）~~； |
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| 摘 要： | 根据不同初始含水率原状黄土结构性演化规律，基于临界状态土力学理论，以应力、初始含水率和应变为基本变量，提出了一个可以反映原状黄土结构性演化规律及软化特性的临界状态本构模型。模型通过对比不同初始含水率下重塑与原状黄土等向压缩曲线，建立了不同含水率下原状黄土的结构性参数及其演化方程。此外，模型采用非相关联流动法则，以剪胀方程的形式来求解塑性偏应变。模型共计9个材料参数，均可由压缩试验和常规三轴剪切试验求得。通过与已有试验数据的对比发现，本模型不仅可以较好地体现初始含水率对原状黄土结构强度、变形特性以及结构破坏规律的影响，而且能较为合理地预测原状黄土的硬化及软化特性。所建立的结构性黄土临界状态模型为深化黄土力学特性研究提供了可能，同时为有效计算黄土地基湿陷变形提供了一定的理论依据。
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| 关 键 词： | 原状黄土 临界状态理论 初始含水率 结构性 软化特性 |
| 收稿时间： | 2021-07-05 |
| 修稿时间： | 2021-12-17 |
A critical state model for structural loess considering water content |
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| HOU Le-le,WENG Xiao-lin,LI Lin,ZHOU Rong-ming.A critical state model for structural loess considering water content[J].Rock and Soil Mechanics,2022,43(3):737-748. |
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| Authors: | HOU Le-le WENG Xiao-lin LI Lin ZHOU Rong-ming |
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| Institution: | 1. School of Highway, Chang’an University, Xi’an, Shaanxi 710064, China; 2. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an, Shaanxi 710064, China |
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| Abstract: | According to the structural evolution behaviors of undisturbed loess with different initial water contents, and based on the theory of critical-state soil mechanics, a critical-state constitutive model is proposed to describe the structural evolution and softening characteristics of undisturbed loess. The model involves stress, initial water content and strain as basic variables. By comparing the isotropic compression curves of remolded and undisturbed loess with different initial water content, the structural parameters and evolution equations of undisturbed loess with different initial water contents have been established. The model adopts the uncorrelated flow rule for plastic strain solver in terms of dilatancy equation. Nine parameters are introduced in the model, which can be calibrated from compression test and conventional triaxial shear test. Compared against the existing experimental data, it is found that this model can not only describe the influence of initial water content on the strength, deformation characteristics and failure mechanism of undisturbed loess structure, but also reasonably predict the hardening and softening characteristics of undisturbed loess. The critical state model of structural loess established in this paper provides a solution for further study of mechanical properties of loess and a theoretical basis for adequate calculation of the collapsibility and deformation of loess foundation. |
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| Keywords: | undisturbed loess critical state theory initial water content structure softening property |
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