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| 单轴压缩下岩石蠕变失稳破坏过程数值模拟 | |
| 引用本文： | 李连崇,徐涛,唐春安,朱立凯.单轴压缩下岩石蠕变失稳破坏过程数值模拟[J].岩土力学,2007,28(9):1978-1982. |
| 作者姓名： | 李连崇 徐涛 唐春安 朱立凯 |
| 作者单位： | 1. 大连理工大学,土木水利工程学院,大连,116024 2. 大连理工大学,土木水利工程学院,大连,116024;大连大学,材料破坏力学数值试验研究中心,大连,116622;中国科学院岩土力学重点实验室,武汉,430071 3. 煤炭科学研究总院抚顺分院,抚顺,113001 |
| 基金项目： | 国家自然科学基金;中国博士后科学基金;中国科学院重点实验室基金;国家重点实验室基金 |
| 摘 要： | 在岩石破裂过程分析（RFPA^2D）系统的基础上,考虑岩石损伤过程的时间因素影响,引入岩石细观单元蠕变本构方程,建立了考虑流变效应的岩石破裂过程RFPA^2D数值模型。应用该模型模拟了恒定荷载作用下岩石的蠕变破坏过程,得到了岩石蠕变破裂的3个典型阶段：初始蠕变阶段、稳定蠕变阶段和加速蠕变阶段,模拟结果同实验室试验所观察到的现象十分吻合。这表明考虑流变效应的RFPA^2D数值模型适用于模拟岩石的蠕变破坏这一复杂的、非线性演化问题。此外,数值模拟还揭示了岩石的宏观蠕变破坏实质上是细观层次上单元损伤累计的结果,这些结论对岩石工程的长期稳定性研究具有重要的理论指导和实践意义。 |
| 关 键 词： | 岩石 破裂过程 蠕变 单轴压缩 数值模拟 |
| 文章编号： | 1000-7598-（2007）09-1978-06 |
| 收稿时间： | 2005-09-26 |
| 修稿时间： | 2005-09-262006-02-08 |
Numerical simulation of creep induced progressive failure process of rock under uniaxial compression |
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| LI Lian-chong,XU Tao,TANG Chun-an,ZHU Li-kai.Numerical simulation of creep induced progressive failure process of rock under uniaxial compression[J].Rock and Soil Mechanics,2007,28(9):1978-1982. | |
| Authors: | LI Lian-chong XU Tao TANG Chun-an ZHU Li-kai |
| Institution: | 1. School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China; 2. Center for Material Failure Modelling Research, Dalian University, Dalian 116622, China; 3. Key Laboratory of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 4. Fushun Branch of China Coal Research Institute, Fushun 113001, China |
| Abstract: | On the basis of rock failure process analysis(RFPA)code,together with the time-dependence of the rock progressive damage and the creep constitutive relation of the characteristic elements at a mesoscopic scale,the rheological model of rock in the failure process under loading is further developed.Using the further developed RFPA code,the progressive creep failure of rock specimens under constant loading was numerically simulated and the typical time-dependent deformations: the transient creep,the steady-state creep and the accelerating creep were also represented.The fact that the simulations are well tallied with the observations in laboratory shows that the rheological model is appropriate to investigate the nonlinear complicated creep failure of rocks.The numerical simulations indicate that the macroscopic creep failure is induced by clusters of microfracturing at a meso scale.The above numerical results offer us some important theoretical indications and practical instructions to further investigate the instability failure mechanisms of engineering rockmass and take some precautions to prevent their occurrences of rock hazards in rock engineering. |
| Keywords: | rock failure process creep uniaxial compression numerical simulation |
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