湿载耦合作用下黄土结构性损伤演化及本构关系

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摘要针对增湿、加荷作用下黄土结构性损伤演化的变形问题，通过压缩变形特性和三轴剪切变形特性，分析黄土结构性损伤的宏观力学反映。分析结果表明，土的含水量增加、固结压力增大和剪切作用均会引起黄土的结构性损伤。随着含水量的增大，压缩作用损伤和剪切作用损伤更加突出；固结压力较大时，压剪作用对土原生结构破损更突出，其次生结构和剪缩性增强。将结构性损伤土视为原状结构体和完全损伤体的复合体，综合应用应力比损伤方程和应变损伤方程，在比较原状土与饱和重塑土应力比建立结构性参数的基础上，建立黄土的结构性损伤演化方程；在原状结构体服从弹性定律、完全损伤体服从修正剑桥模型的基础上，从结构性损伤土变形为原状结构体弹性变形和完全损伤体弹塑性变形叠加出发，建立结构性土的损伤弹塑性本构方程。同时，比较分析不同湿度黄土试验测试的应力–应变曲线和损伤弹塑性本构方程描述的理论曲线，两者比较一致，验证了该本构关系的合理性。

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关键词 ：土力学, 湿载耦合, 黄土, 结构性损伤

Abstract：In order to study the deformation of destructured loess induced by structural damage under coupling of stress and moisture，the macromechanics reflection of structured loess is analyzed，which is induced by structural damage development，by analyzing the deformation of structured loess under compression tests and triaxial tests. The analysis result shows that water content increasing，consolidation pressures increasing，and shearing would cause structural damage of loess. With the water content increasing，structural damage of loess is more prominent by compression and shearing. When consolidation pressures are much larger，structural damage of intact loess by compression and shearing is significant，and the secondary structure and shearing-compression are increasing. Based on structural parameter proposed by comparing with the stress ratios of intact loess and saturated remolded loess during triaxial experiments，and utilizing the stress ratio damage equation and strain damage equation，the structural damage evolution equation is proposed by regarding structural damage loess as complex materials composed of intact loess and destructured loess. Based on the intact loess following Hooke?s law and normal consolidation loess following modified Cambridge model，the elastoplastic damage constitutive equation is proposed by regarding deformation of destructured loess as elastic deformation of intact loess and elastoplastic deformation of normal consolidation loess. Meanwhile，the rationality of constitutive relationship is tested and verified by comparing and analyzing test curves under different moistures and theoretical curves described by the elastoplastic constitutive model proposed in this paper.

Key words： soil mechanics coupling of stress and moisture loess structural damage

收稿日期: 2011-10-31

引用本文:

罗爱忠1，2，邵生俊1. 湿载耦合作用下黄土结构性损伤演化及本构关系[J]. 岩石力学与工程学报, 2012, 31(4): 841-847.
LUO Aizhong1，2，SHAO Shengjun1. STRUCTURAL DAMAGE EVOLUTION AND CONSTITUTIVE RELATION OF LOESS UNDER COUPLING OF STRESS AND MOISTURE. , 2012, 31(4): 841-847.

链接本文:

http://www.rockmech.org/CN/Y2012/V31/I4/841

[1]	龚晓南，熊传祥，项可祥，等. 黏土结构性对其力学性质的影响及形成原因分析[J]，水利学报，2000，(10)：43-47.(GONG Xiaonan，XIONG Chuanxiang，XIANG Kexiang，et al. The formation of clay structure and its influence on mechanical characteristics of clay[J]. Journal of Hydraulic Engineering，2000，(10)：43-47.(in Chinese)) " target="_blank">
[4]	DOUGILL J W，LAU J C，BURTN J. Toward a theoretical model for progressive failure and softening in rock，concrete and similar materials[C]// Mechanics in Engineering. Virginian：American Society of Civil Engineers Press，1976：335-355. " target="_blank">
[6]	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，(3)：247-255.(SHEN Zhujiang. A nonlinear damage mechanical model for structured clay[J]. Hydro-science and Engineering，1993，(3)：247-255.(in Chinese)) " target="_blank">
[2]	胡瑞林. 黏性土微结构定量模型及其工程地质特征研究[M]. 北京：地质出版社，1995：41-44.(HU Ruilin. Research on quantitative microstructure models of natural clayed soils and its engineering geology characteristics[M]. Beijing：Geological Publishing House，1995：41-44.(in Chinese)) " target="_blank">
[3]	谢定义，姚仰平，党发宁. 高等土力学[M]. 北京：高等教育出版社，2008：22-23.(XIE Dingyi，YAO Yangping，DANG Faning，Advanced soil mechanics[M]. Beijing：Higher Education Press，2008：22-23.(in Chinese)) " target="_blank">
[5]	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 Zhujiang. An elastoplastic damage model for structured clays[J]. Chinese Journal of Geotechnical Engineering，1993，15(3)：21-28.(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 Zhujiang. A masonry model for structured clays[J]. Rock and Soil Mechanics，2000，21(1)：1-4.(in Chinese)) " target="_blank">
[12]	曹文贵，方祖烈，唐学军. 岩石损伤软化统计本构模型之研究[J]. 岩石力学与工程学报，1998，17(6)：628-633.(CAO Wengui，FANG Zulie，TANG Xuejun. A study of statistical constitutive model for soft and damage rocks[J]. Chinese Journal of Rock Mechanics and Engineering，1998，17(6)：628-633.(in Chinese))
[13]	SALARI M R，SAEB S，WILLAM K J，et al. A coupled elastoplastic damage model for geomaterials[J]. Computer Methods in Applied Mechanics Engineering，2004，193(27/28/29)：2 625-2 643. " target="_blank">
[16]	LEMAITRE J. Coupled elasto-plasticity and damage constitutive equations[J]. Computer Methods in Applied Mechanics Engineering，1985，51(1/2/3)：31-49. " target="_blank">
[17]	谢定义，齐吉琳. 土结构性及其定量化参数研究的新途径[J]. 岩土工程学报，1999，21(6)：651-656.(XIE Dingyi，QI Jilin. Soil structure characteristics and new approach in research on its quantitative parameter[J]. Chinese Journal of Geotechnical Engineering，1999，21(6)：651-656.(in Chinese))
[8]	LEMAITRE J，DUFAILLY J. Damage measurements[J]. Engineering Fracture Mechanics，1987，28(5/6)：643-661. " target="_blank">
[11]	KRAJCINOVIC D，FANELLA D. A micromechanical damage model for concrete[J]. Engineering Fracture Mechanics，1986，25(5/6)：585-596. " target="_blank">
[15]	CHIARELLI A S，SHAO J F，HOTEIT N. Modeling of elastoplastic damage behavior of a claystone[J]. International Journal of Plasticity，2003，19(1)：23-45.
[18]	邓国华. 真三轴条件下黄土的结构性参数及结构性本构关系研究[博士学位论文][D]. 西安：西安理工大学，2009.(DENG Guohua. Research on structural parameter of loess and structural constitutive relations under true triaxial condition[Ph. D. Thesis][D]. Xi?an：Xi?an University of Technology，2009.(in Chinese)) " target="_blank">
[9]	邵生俊，罗爱忠，于清高，等. 加荷增湿作用下Q3黏黄土的结构损伤特性[J]. 岩土工程学报，2006，28(12)：2 077-2 082.(SHAO Shengjun，LUO Aizhong，YU Qinggao，et al. Structural damage properties of Q3 loess under triaxial loading and moistening[J]. Chinese Journal of Geotechnical Engineering，2006，28(12)：2 077- 2 081.(in Chinese)) " target="_blank">
[10]	雷胜友，唐文栋，王晓谋，等. 原状黄土损伤破坏过程的CT扫描分析(II)[J]. 铁道科学与工程学报，2005，2(1)：51-56.(LEI Shengyou，TANG Wendong，WANG Xiaomou，et al. CT scanning analysis of undisturbed loess in the damage and failure processes(II)[J]. Journal of Railway Science and Engineering，2005，2(1)：51-56.(in Chinese)) " target="_blank">
[14]	LEMAITRE J，DESMORAT R，SAUZAY M. Anisotropic damage law of evolution[J]. European Journal of Mechanics-A/Solids，2000，19(2)：187-208. " target="_blank">