| 岩石损伤软化的修正本构模型 |
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| 引用本文： | 李博,吴润江,高为超.岩石损伤软化的修正本构模型[J].西北地震学报,2016,38(5):783-786. |
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| 作者姓名： | 李博 吴润江 高为超 |
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| 作者单位： | 西北核技术研究所, 陕西 西安 710024,西北核技术研究所, 陕西 西安 710024,西北核技术研究所, 陕西 西安 710024 |
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| 摘 要： | 利用服从Weibull分布的岩石微元强度表示方法,基于Drucker-Prager破坏准则,通过引入损伤变量的修正系数,利用应力-应变关系曲线峰值点处的应力、应变确定Weibull分布参数的关系式,建立不同围压下的损伤软化本构模型。该模型参数较少且易于确定,其参数的确定方法揭示了模型参数的物理意义。与前人的研究成果进行对比分析,结果表明该模型比未修正前有着明显的优越性,且与实测结果吻合较好,分析结果显示出该模型的合理性。
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| 关 键 词： | 岩石 损伤 软化 修正 本构模型 |
| 收稿时间： | 2015/5/31 0:00:00 |
A Modified Damage Softening Constitutive Model for Rock |
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| LI Bo,WU Run-jiang and GAO Wei-chao.A Modified Damage Softening Constitutive Model for Rock[J].Northwestern Seismological Journal,2016,38(5):783-786. |
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| Authors: | LI Bo WU Run-jiang and GAO Wei-chao |
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| Institution: | Northwest Institute of Nuclear Technology, Xi''an 710024, Shaanxi, China,Northwest Institute of Nuclear Technology, Xi''an 710024, Shaanxi, China and Northwest Institute of Nuclear Technology, Xi''an 710024, Shaanxi, China |
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| Abstract: | Using a rock micro-unit strength,which satisfies the Weibull random distribution and is based on the Drucker-Prager failure criterion,a correction coefficient for damage variables is introduced,which reflects the full stress-strain process and residual strength of rock.The relationship between Weibull distribution parameters under different confining pressures is established using the stress and strain at peak points on the stress-strain curve.A damage softening constitutive model of rock is then established,accounting for the rock triaxial stress-strain test curve.The model has few parameters,and the way of determining the parameters indicates the physical meaning of the model parameters.Compared with previous studies,this model,after modification,has obvious advantages.The rationality of the model proposed here is demonstrated using comparative analysis between the theoretical and experimental results. |
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| Keywords: | rock damage softening modified constitutive model |
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