| 考虑黄土结构性和各向异性的修正剑桥模型 |
| |
| 引用本文： | 张玉伟,翁效林,宋战平,谢永利.考虑黄土结构性和各向异性的修正剑桥模型[J].岩土力学,2019,40(3):1030-1038. |
| |
| 作者姓名： | 张玉伟 翁效林 宋战平 谢永利 |
| |
| 作者单位： | 1. 西安建筑科技大学 土木工程学院，陕西 西安 710055；2. 长安大学 公路学院，陕西 西安 710064 |
| |
| 基金项目： | 国家自然科学基金（No.51378004，No.51008032）；中央高校基本科研业务费专项资金项目（No.CHD2012JC001）；西安建筑科技大学人才基金（No.RC1803）；中国博士后基金资助项目（No.2018M643809XB）。 |
| |
| 摘 要： | 天然原状黄土具有结构性和各向异性，如何在本构模型中合理反映两者的影响成为模型模拟效果优劣的关键。基于修正剑桥模型，在 平面内引入结构性参数 反映天然黄土结构性，通过屈服面旋转的方法引入各向异性参数 反映天然黄土各向异性，模型硬化规律考虑了各向异性的影响，采用相关联流动法则，结合一致性条件推导了增量型应力?应变关系，建立了考虑黄土结构性和各向异性影响的修正剑桥模型。当不考虑结构性和各向异性时，模型退化为修正剑桥模型。模型共有8个参数，均可通过常规室内试验获得。选取天然原状黄土开展了三轴试验，试验结果与模型计算结果对比表明，考虑结构性和各向异性影响的修正剑桥模型模拟天然原状黄土的应力?应变特性效果优于修正剑桥模型。
|
| 关 键 词： | 原状黄土 结构性 各向异性 修正剑桥模型 三轴试验 |
| 收稿时间： | 2017-09-18 |
A modified Cam-clay model for structural and anisotropic loess |
| |
| ZHANG Yu-wei,WENG Xiao-lin,SONG Zhan-ping,XIE Yong-li.A modified Cam-clay model for structural and anisotropic loess[J].Rock and Soil Mechanics,2019,40(3):1030-1038. |
| |
| Authors: | ZHANG Yu-wei WENG Xiao-lin SONG Zhan-ping XIE Yong-li |
| |
| Institution: | 1. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China;
2. School of Highway, Chang’an University, Xi’an, Shaanxi 710064, China |
| |
| Abstract: | As known, natural geotechnical materials always have the characteristics of structure and anisotropy. How to express their effects rationally in the constitutive model is the key point for evaluating the advantages and disadvantages of the constitutive model. On the basis of the modified Cam-clay model, a structural parameter was used to express structural characteristic of natural original soil in plain. An anisotropic parameter was used by rotating yield surface to express anisotropy effect. The anisotropic parameter also be used in the process of deducting the hardening rule. A modified Cam-clay model considering structural and anisotropic properties was established. Combined with the associated flow rule and consistency condition, the incremental stress-strain relationship from the constitutive model was derived. The model consisted of 8 parameters which can all be obtained by the conventional laboratory tests. At the last, the triaxial shear tests was carried out using natural original loess, the comparison of experimental results and model calculation shows that the modified Cam-clay model considering soil structure and anisotropy could simulate the mechanical characteristic of natural original loess correctly. |
| |
| Keywords: | undisturbed loess structural character anisotropic character modified cam-clay model triaxial test |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
