荷载和水作用下结构性黄土破损规律的离散元分析

蒋明镜; 胡海军

doi:10.11779/CJGE201406001

荷载和水作用下结构性黄土破损规律的离散元分析 English Version

蒋明镜^{1, 2},
胡海军³

1. 同济大学地下建筑与工程系,上海 200092; 2. 同济大学岩土及地下工程教育部重点实验室,上海 200092; 3. 西北农林科技大学水利与建筑工程学院,陕西杨凌 712100

基金项目: 国家杰出青年科学基金项目（51025932）; 国家自然科学基金项目（51179128）; 教育部博士点基金项目（20100072110048）; 教育部长江学者和创新团队发展计划项目（IRT1029）

详细信息

作者简介:
蒋明镜(1965- ),男,教授,博士生导师,主要从事天然结构性黏土、砂土、非饱和土、太空土和深海能源土宏观微观试验、本构模型和数值分析研究。E-mail: mingjing.jiang@tongji.edu.cn。

中图分类号: TU444
计量
- 文章访问数: 346
- HTML全文浏览量: 4
- PDF下载量: 395
出版历程
- 收稿日期: 2013-03-27
- 发布日期: 2014-06-19

Numerical analysis of degradation evolution of structured loess under loading, unloading and wetting by discrete element method

JIANG Ming-jing^{1, 2},
HU Hai-jun³

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. College of Water Resources and Architecture Engineering, Northwest A & F University, Yangling 712100, China

摘要

摘要: 采用离散元法（DEM）分析了增减荷和增湿作用下结构性黄土的破损规律。首先,给出了定义在离散介质上的破损参数表达式并介绍了已有代表性结构性土本构模型中破损参数的函数形式；其次,根据离散元微观测试技术获得了加减荷和增湿数值试验中破损参数的变化规律,检验了已有代表结构性土本构模型中破损规律的函数形式,给出了其与宏观量如应力和应变的函数关系,最后建议了多种应力路径和增湿路径下破损参数的计算公式,这些公式中参数较少,并且能较好地反映荷载和水作用下结构性黄土破损参数的变化规律。
- 黄土 /
- 破损 /
- 本构模型 /
- 微观理论 /
- 离散元
Abstract: The breakage parameter evaluation is analyzed for structured loess under loading, unloading and wetting by distinct element method (DEM). First, the breakage parameter is defined based on the discrete medium, and the expressions for breakage parameter in representative models for structured soils are introduced. Then the evaluation of breakage parameter for structured loess under loading, unloading and wetting is measured by the micro measurement technique of discrete element method. The relation between the breakage parameter and the macroscopic parameter such as strain or stress is presented, and the forms of formulas for the breakage parameter in representative models for structured soils are examined. Finally the formulas for calculating the breakage parameter under different stress paths and wetting paths are proposed. The parameters in these formulas are few and the formulas can predict the evaluation of breakage parameter for structured loess under loading and wetting well.
- loess /
- breakage /
- constitutive model /
- microscopic theory /
- DEM

HTML全文

参考文献(18)

[1]	沈珠江, 章为民. 损伤力学在土力学中的应用[C]// 第三届全国岩土力学数值分析与解析方法讨论会论文集. 珠海, 1988: 47-51. (SHEN Zhu-jiang, ZHANG Wei-min. Application of damage mechanics in the soil mechanics[C]// Proceeding of the 3th conference on the numerical analysis and analytic method of soil mechanics. Zhuhai, 1988: 595-610. (in Chinese))
[2]	沈珠江. 结构性黏土的弹塑性损伤模型[J]. 岩土工程学报, 1993, 15(3): 21-28. (SHEN Zhu-jiang. An elasto-plastic damage model for cemented clays[J]. Chinese Journal of Geotechnical Engineering, 1993, 15(3): 21-28. (in Chinese))
[3]	沈珠江. 结构性黏土的非线性损伤力学模型[J].水利水运科学研究, 1993, 15(3): 247-255. (SHEN Zhu-jiang.A nonlinear damage model for structured clay[J]. Journal of Nanjing Hydraulic Research Institute, 1993, 15(4): 247-255. (in Chinese))
[4]	沈珠江. 土体变形特性的损伤力学模型[C]// 第五届全国岩土力学数值分析与解析方法讨论会. 重庆, 1994. (SHEN Zhu-jiang. Deformation characteristics of damage mechanics model[C]// The 5th symposium of numerical analysis and analytical method in rock and soil mechanics. Chongqing, 1994. (in Chinese))
[5]	沈珠江. 黄土的损伤力学模型探索[C]// 第七届土力学及基础工程学术会议论文集. 西安, 1994: 145-149. (SHEN Zhu-jiang. Approach to damage mechanic model of loess[C]// Conference of 7th Soil Mechanics and Geotechnical Engineering. Xi'an, 1994. (in Chinese))
[6]	沈珠江. 广义吸力和非饱和土的统一变形理论[J]. 岩土工程学报, 1996, 18(2): 1-9. (SHEN Zhu-jiang. Generalized suction and unified deformation theory for unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 1996, 18(2): 1-9. (in Chinese))
[7]	沈珠江. 结构性黏土的堆砌体模型[J]. 岩土力学, 2000, 21(1): 1-4. (SHEN Zhu-jiang. A masonry model for structured clays[J]. Rock and Soil Mechanics, 2000, 21(1): 1-4. (in Chinese))
[8]	沈珠江, 陈铁林. 岩土破损力学: 基本概念、目标和任务[C]// 中国岩石力学与工程学会第七次学术大会. 西安, 2002: 9-12. (Breakage mechanics for geological materials basic concepts, goal and task[C]// Proceedings of 7th conference on rock mechanics and project. Xi'an, 2002: 9-12. (in Chinese))
[9]	沈珠江. 岩土破损力学: 理想脆弹塑性模型[J]. 岩土工程学报, 2003, 25(3): 253-257. (SHEN Zhu-jiang. Breakage mechanics for geological materials: an ideal brittle-elasto- plastic model[J]. Chinese Journal of Geotechnical Engineering, 2003, 25(3): 253-257. (in Chinese))
[10]	沈珠江, 胡再强. 黄土的二元介质模型[J]. 水利学报, 2003, 34(7): 1-6. (SHEN Zhu-jiang, HU Zai-qiang. Binary medium model for loess[J]. Journal of Hydraulic Engineering, 2003, 34(7): 1-6. (in Chinese))
[11]	沈珠江. 二元介质模型在黄土增湿变形分析中的应用[J].水利学报, 2005, 36(2): 129-134. (SHEN Zhu-jiang, Application of binary medium model in deformation analysis of loess during wetting[J]. Journal of Hydraulic Engineering,2005, 36(2): 129-134. (in Chinese))
[12]	沈珠江, 刘恩龙, 陈铁林. 岩土二元介质模型的一般应力应变关系[J]. 岩土工程学报, 2005, 27(5): 489-494. (SHEN Zhu-jiang, LIU En-long, CHEN Tie-lin. Generalized stress-strain relationship of binary medium model for geological materials[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(5): 489-495. (in Chinese))
[13]	孙渝刚. 结构性砂土宏微观力学特性的试验研究与数值模拟[D]. 上海: 同济大学, 2012. (SUN Yu-gang. Experimental and numerical investigation on macro- and micro- mechanical behaviors of structural sands[D]. Shanghai: Tongji University, 2012. (in Chinese))
[14]	蒋明镜, 胡海军, 彭建兵. 结构性黄土一维湿陷特性的离散元数值模拟[J]. 岩土力学, 2013, 34(3): 1121-1130. (JIANG Ming-jing, HU Hai-jun, PENG Jian-bing. Simulation of collapsible behavior of structural loess under one-dimensional condition by discrete element method (DEM)[J]. Rock and Soil Mechanics, 2013, 34(3): 1121-1130. (in Chinese))
[15]	李建红. 基于细观破损机理的胶结结构性土本构模型研究[D]. 北京: 清华大学, 2008. (LI Jian-hong. A Constitutive model of bonded soil based on the micro-mechanism of bonding-breakage[D]. Beijing: Tsinghua University, 2012.(in Chinese))
[16]	CUNDALL P A, Strack O D L. The distinct element method as a tool for research in granular media, Part Ⅰ[R]. Minnesota: University of Minnesota, 1978: 1-97.
[17]	BAGI K. Stress and strain in granular assemblies[J]. Mechanics of Materials, 1996, 22(3): 165-177.
[18]	熊传祥, 龚晓南. 一种改进的软土结构性弹塑性损伤模型[J]. 岩土力学, 2006, 27(3): 395-397, 403. (XIONG Chuan-xiang, GONG Xiao-nan. An updated elastoplastic damage model for structural soft-clays[J]. Rock and Soil Mechanics, 2006, 27(3): 395-397, 403. (in Chinese))