| 一种改进的岩石黏弹塑性加速蠕变力学模型 |
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| 引用本文： | 曹平,刘业科,蒲成志,陈锐,汪亦显.一种改进的岩石黏弹塑性加速蠕变力学模型[J].中南大学学报(自然科学版),2011,42(1). |
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| 作者姓名： | 曹平 刘业科 蒲成志 陈锐 汪亦显 |
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| 作者单位： | 中南大学,资源与安全工程学院,湖南,长沙,410083 |
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| 基金项目： | 国家自然科学基金资助项目(10972238); 教育部博士点基金资助项目(20090162110037); 中南大学研究生学位论文创新选题基金资助项目(134377237) |
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| 摘 要： | 为了全面描述岩石蠕变全过程,克服线性牛顿体不能准确描述加速蠕变的不足,在引入非线性蠕变体模型基础上,结合流变力学模型理论,定义应力与试件长期强度的比值为加速蠕变速率幂级数n,模型发生加速蠕变时的总蠕变量为蠕变特征长度εc,进而得到一种改进的能够描述岩石黏弹塑性加速蠕变的力学模型。结合东乡铜矿砂质页岩单轴压缩下分级增量循环加卸载蠕变试验,对模型参数的辨识进行解释,并将该模型的蠕变拟合曲线与实验的蠕变曲线进行对比。研究结果表明:该模型能很好地描述了岩石的加速蠕变特性。
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| 关 键 词： | 流变模型 加速蠕变 蠕变体模型 黏弹塑性模型 长期强度 特征长度 |
An improved accelerated creep mechanical model of viscoelasto-plastic rock |
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| CAO Ping,LIU Ye-ke,PU Cheng-zhi,CHEN Rui,WANG Yi-xian.An improved accelerated creep mechanical model of viscoelasto-plastic rock[J].Journal of Central South University:Science and Technology,2011,42(1). |
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| Authors: | CAO Ping LIU Ye-ke PU Cheng-zhi CHEN Rui WANG Yi-xian |
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| Institution: | CAO Ping,LIU Ye-ke,PU Cheng-zhi,CHEN Rui,WANG Yi-xian (School of Resources and Safety Engineering,Central South University,Changsha 410083,China) |
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| Abstract: | In order to depict the process of rock creep comprehensively,and overcome the deficiency of the linear Newton fluid which can not describe accelerated creep accurately,based on the mature rheological model,the nonlinear creep body model was introduced.In this model,the total creep strain before accelerated creep stage was defined as the characteristic length of creep,and the ratio of stress level and long-term strength of rock specimens was defined as accelerated creep rate.The improved rheological mechanic... |
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| Keywords: | rheological model accelerated creep creep body model viscoelasto-plastic model long-term strength characteristic length |
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