非贯通节理岩体单轴压缩动态损伤本构模型

刘红岩; 王新生; 张力民; 张力国

doi:10.11779/CJGE201603005

非贯通节理岩体单轴压缩动态损伤本构模型 English Version

刘红岩^{1, 2},
王新生³,
张力民^{4, 5},
张力国⁵

1. 中国地质大学(北京)工程技术学院,北京 100083;
2. 西藏大学工学院,西藏拉萨 850000;
3. 河南理工大学土木工程学院,河南焦作 454000;
4. 北京科技大学土木与环境工程学院,北京 100083;
5. 河北钢铁集团矿业有限公司,河北唐山 063000

基金项目: 国家自然科学基金项目(41002113,41162009); 中央高校基本科研业务费专项资金项目(2-9-2014-019,2-9-2015-263)

详细信息

作者简介:
刘红岩(1975- ),男,博士,教授,注册岩土工程师,高级爆破工程师,主要从事岩土工程方面的教学和科研.E-mail: lhy1204@cugb.edu.cn.

中图分类号: TU43
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出版历程
- 收稿日期: 2014-11-03
- 发布日期: 2016-03-24

A dynamic damage constitutive model for rock mass with non-persistent joints under uniaxial compression

1. College of Engineering & Technology, China University of Geosciences (Beijing), Beijing 100083, China;
2. School of Engineering, Tibet University, Lhasa 850000, China;
3. College of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China;
4. Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China;
5. Hebei Iron and Steel Group Mining Co., Ltd., Tangshan 063000, China

摘要

摘要: 非贯通节理岩体是同时含有节理,裂隙等宏观缺陷及微裂隙,微孔洞等细观缺陷的复合损伤地质材料,基于此提出了在非贯通节理岩体动态损伤本构模型中应同时考虑宏,细观缺陷的观点.首先对基于细观动态断裂机理的经典动态损伤本构模型----TCK模型进行了阐述,其次针对目前节理岩体损伤变量定义中仅考虑节理几何参数而未考虑其强度参数的不足,基于能量原理和断裂力学理论推导得出了同时考虑节理几何及强度参数的宏观损伤变量(张量)的计算公式;第三,基于Lemaitre等效应变假设推导了综合考虑宏,细观缺陷的复合损伤变量(张量);第四,借鉴前人基于复合材料力学的观点,考虑了节理法向及切向刚度等变形参数对岩体动态力学特性的影响,进而建立了基于TCK模型的非贯通节理岩体单轴压缩动态损伤本构模型.并利用该模型讨论了载荷应变率,节理内摩擦角,节理厚度,节理法向及切向刚度和节理倾角等对岩体动态力学特性的影响规律.计算结果与目前的理论及试验研究结果比较吻合,从而说明了该模型的合理性.
- 岩体 /
- 非贯通节理 /
- 动态损伤本构模型 /
- 宏 /
- 细观缺陷 /
- 损伤耦合 /
- 应力强度因子 /
- 等效弹性模型
Abstract: The rock mass with non-persistent joints is a kind of compound damage geological material which contains both the macroscopic flaws such as the joint and crack and the mesoscopic ones such as the microcrack and microhole. Therefore, the viewpoint that the above two kinds of flaws should be simultaneously considered in the dynamic damage constitutive model for jointed rock mass is proposed. Firstly, the classic rock dynamic damage constitutive model, based on mesoscopic dynamic fracture mechanism namely TCK model, is discussed. Secondly, aiming at the shortcoming that the geometrical parameters are only considered but the strength ones are not in the current damage variable definition, the computational formula for the macroscopic damage variable (tensor) of the jointed rock mass which can consider the geometrical and strength parameters at the same time is obtained based on the energy principle and fracture mechanics theory. Thirdly, the compound damage variable (tensor) comprehensively considering macroscopic and mesoscopic flaws based on the Lemaitre equivalent strain hypothesis is deduced. Fourthly, based on the viewpoint of the compound material mechanics proposed by others, the effect of the joint deformation parameters such as the normal and shear stiffness on the dynamic mechanical behavior of rock mass is considered. Finally, the corresponding dynamic damage constitutive model for the jointed rock mass under uniaxial compression based on TCK model is established. The effects of the strain ratio of loads, internal friction angle of joints, joint depth, shear and normal stiffnesses of joints and dip angles of joints on the dynamic mechanical behavior of rock mass are discussed using the proposed model. The calculated results fit very well the current experimental and theoretical ones, indicating the rationality of the proposed model.
- rock mas /
- non-persistent joint /
- dynamic damage constitutive model /
- macro-mesoscopic flaw /
- damage coupling /
- stress intensity factor /
- equivalent elastic model /
- undefined

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参考文献(28)

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