| 基于动态CT识别的冻土单轴压缩损伤本构模型 |
| |
| 引用本文： | 刘增利,张小鹏,李洪升.基于动态CT识别的冻土单轴压缩损伤本构模型[J].岩土力学,2005,26(4):542-546. |
| |
| 作者姓名： | 刘增利 张小鹏 李洪升 |
| |
| 作者单位： | 大连理工大学,工程力学系工业装备结构分析试验室,大连,116023;中科院兰州寒区旱区环境与工程研究所,冻土工程国家重点试验室,兰州,730000 |
| |
| 基金项目： | 中科院兰州寒区旱区环境与工程研究所冻土工程国家重点实验室资助项目(No.SKLFSE200301)，国家自然科学基金资助项目(No.50278010) |
| |
| 摘 要： | 采用连续介质力学与热力学方法，建立了冻土单轴压缩损伤本构模型。以兰州冻结黄土为例，基于冻土单轴压缩动态CT试验，对冻土附加损伤的2个阶段，即塑性损伤和微裂纹扩展损伤分别采用硬化曲线法和动态CT识别方法进行了损伤计算，在此基础上给出了冻土附加损伤与弹性应变的对应关系，建立了基于试验的冻土损伤演化方程，并进行了有效应力的计算。
|
| 关 键 词： | 冻土 单轴压缩 CT动态测试 损伤本构模型 |
| 文章编号： | 1000-7598-(2005)04-0542-05 |
| 收稿时间： | 2003-12-29 |
| 修稿时间： | 2003年12月29 |
A damage constitutive model for frozen soils under uniaxial compression based on CT dynamic distinguishing |
| |
| LIU Zeng-li,ZHANG Xiao-peng,LI Hong-sheng.A damage constitutive model for frozen soils under uniaxial compression based on CT dynamic distinguishing[J].Rock and Soil Mechanics,2005,26(4):542-546. |
| |
| Authors: | LIU Zeng-li ZHANG Xiao-peng LI Hong-sheng |
| |
| Institution: | 1. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116023, China; 2. State Key Laboratory of Frozen Soil, LIGG, CAS, Lanzhou, 730000, China |
| |
| Abstract: | A damage constitutive model for frozen soil under uniaxial compression is set up according to continuous damage mechanics theory. Based on CT timely investigation, the damage values of Lanzhou loess under uniaxial compression are calculated by hardening curve method and CT distinguishing method for plastic and micro-crack damage processes respectively. Furthermore, a linear relationship between damage value and elastic strain is presented to express evolution model for damage;and effective stress is calculated. |
| |
| Keywords: | frozen soil uniaxial compression CT timely investigation damage constitutive model |
| 本文献已被 CNKI 维普 万方数据 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 |
