| 考虑围压影响的盐岩弹塑性损伤本构模型研究 |
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| 引用本文： | 贾善坡,罗金泽,杨建平,高 敏,龚 俊. 考虑围压影响的盐岩弹塑性损伤本构模型研究[J]. 岩土力学, 2015, 36(6): 1549-1556. DOI: 10.16285/j.rsm.2015.06.004 |
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| 作者姓名： | 贾善坡 罗金泽 杨建平 高 敏 龚 俊 |
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| 作者单位： | 1. 长江大学 岩土力学与工程研究中心，湖北 荆州 434023；2.中石油华北油田分公司勘探开发研究院，河北 任丘 062552； 3. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071 |
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| 基金项目： | 中国石油科技创新基金（No.2011D-5006-0603）；国家自然科学基金资助项目（No.41102182）；中国博士后科学基金资助（No.2014M551055）；湖北省自然科学基金（No.2015CFB194）。 |
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| 摘 要： | 深入研究盐岩受力变形、破坏机制及力学模型，对于保证油气地下储库的安全和稳定具有十分重要的意义。以盐岩在多组围压下的三轴试验为基础，由热力学定律出发，将损伤引入到改进的摩尔-库仑(Mohr-Coulomb)准则中，提出了与围压相关的损伤准则和塑性硬化函数，建立了一种能够描述盐岩力学特性的弹塑性损伤模型，该模型能够反映盐岩的塑性与损伤耦合、应变硬化-软化和围压影响。将研究成果与ABAQUS软件相结合，通过二次开发，编制了相应的计算程序。通过模拟盐岩室内三轴压缩试验表明，数值模拟曲线与试验曲线吻合较好，所建立的力学模型可以较好地描述盐岩在不同围压状态下的力学损伤发展、应变硬化-软化以及脆-塑性转换的力学特征。
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| 关 键 词： | 盐岩 围压 力学模型 损伤准则 改进摩尔-库仑准则 |
| 收稿时间： | 2013-11-18 |
An elastoplastic damage constitutive model for salt rock considering confining pressure effect |
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| JIA Shan-po,LUO Jin-ze,YANG Jian-ping,GAO Min,GONG Jun. An elastoplastic damage constitutive model for salt rock considering confining pressure effect[J]. Rock and Soil Mechanics, 2015, 36(6): 1549-1556. DOI: 10.16285/j.rsm.2015.06.004 |
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| Authors: | JIA Shan-po LUO Jin-ze YANG Jian-ping GAO Min GONG Jun |
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| Affiliation: | 1. Research Center of Geomechanics and Geotechnical Engineering, Yangtze University, Jingzhou, Hubei 434023, China; 2. Exploration and Development Research Institute of Huabei Oilfield, CNPC, Renqiu, Hebei 062552, China; 3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China |
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| Abstract: | Further study of the mechanism and law of salt rock deformation and breakage has great significance for the safety and stability of the gas storage. Based on the triaxial compression test under different confining pressures, a new elastoplastic damage model with improved Mohr-Coulomb criterion is presented in the framework of the irreversible thermodynamics and nonlinear continuum mechanics, which can depict the confining pressure effect, hardening and softening behaviours of salt rock. In this model, the mechanical damage criterion and hardening function highly depend on the stress state. The solution process for the coupled model is studied using finite element method and the corresponding computer code is developed on the ABAQUS solver. The numerical simulation under various stress states shows that the numerical simulations perfectly agree with the experimental data; and the proposed model is able to effectively depict the main features of mechanical behaviors of salt rock. |
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| Keywords: | salt rock confining pressure mechanical model damage criterion improved Mohr-Coulomb criterion |
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