| 考虑体积变化影响的岩石应变软硬化损伤本构模型及参数确定方法 |
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| 引用本文： | 曹文贵,赵衡,张永杰,张玲.考虑体积变化影响的岩石应变软硬化损伤本构模型及参数确定方法[J].岩土力学,2011,32(3):647-654. |
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| 作者姓名： | 曹文贵 赵衡 张永杰 张玲 |
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| 作者单位： | 湖南大学岩土工程研究所,长沙,410082 |
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| 基金项目： | 国家自然科学基金(No.51078137); 高等学校博士学科点专项科研基金(No.20090161110005)资助项目; 教育部博士研究生学术新人奖资助项目 |
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| 摘 要： | 针对现有岩石损伤模型的局限性与不足,将应力作用下的岩石抽象为空隙、损伤与未损伤材料三部分,以空隙率反映岩石体积或空隙的变化,以损伤变量或损伤因子反映岩石力学性态的改变程度,通过对各部分材料的微观受力及其与宏观应力和应变的关系进行分析,建立了可反映岩石变形过程中体积或空隙变化特性的新型岩石损伤模型;从岩石微元强度合理度量方法研究入手,引进统计损伤理论,建立了可考虑损伤阀值影响的岩石统计损伤演化模型,进而建立了能模拟应变软硬化全过程的岩石统计损伤本构模型,并提出了参数确定方法。该模型不仅能反映岩石应变软硬化特性,而且能反映岩石变形的初期压密和后期扩容的特性。通过实例分析与讨论,表明模型合理与可行。
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| 关 键 词： | 岩石力学 统计损伤 本构模型 初期压密 后期扩容 损伤阀值 |
| 收稿时间： | 2009-09-05 |
Strain softening and hardening damage constitutive model for rock considering effect of volume change and its parameters determination method |
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| CAO Wen-gui,ZHAO Heng,ZHANG Yong-jie,ZHANG Ling.Strain softening and hardening damage constitutive model for rock considering effect of volume change and its parameters determination method[J].Rock and Soil Mechanics,2011,32(3):647-654. |
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| Authors: | CAO Wen-gui ZHAO Heng ZHANG Yong-jie ZHANG Ling |
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| Institution: | Institute of Geotechnical Engineering, Hunan University, Changsha 410082, China |
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| Abstract: | Aiming at the limitations and deficiencies of the current rock damage models,firstly,the rock under stress is divided into three parts abstractly: voids,damaged and undamaged material.The voids ratio is employed to describe rock's change of the volume and the voids;and the damage variable or damage coefficient is used to reflect the conversion degree of mechanical property and state of rock.Then,a new damage model for rock is proposed according to analysis of microcosmic stress and discussion on the relatio... |
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| Keywords: | rock mechanics statistical damage constitutive model volume compression in initial volume expansion in later damage threshold value |
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