| 含双裂隙岩石裂纹演化机理的离散元数值分析 |
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| 引用本文： | 蒋明镜,陈贺,张宁,房锐.含双裂隙岩石裂纹演化机理的离散元数值分析[J].岩土力学,2014,35(11):3259-3268. |
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| 作者姓名： | 蒋明镜 陈贺 张宁 房锐 |
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| 作者单位： | 1.同济大学 土木工程学院地下建筑与工程系，上海 200092；2.同济大学 土木工程防灾国家重点实验室，上海 200092；
3.同济大学 岩土及地下工程教育部重点实验室，上海 200092；4.陆地交通气象灾害防治技术国家工程试验室，昆明 650011 |
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| 基金项目： | 国家973研究计划（No. 2011CB013504，No. 2014CB046901）；国家杰出青年科学基金（No. 51025932）。 |
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| 摘 要： | 采用离散单元法探讨了预制双裂隙岩石的裂纹演化机理。用近期从试验资料提取的无胶结厚度含抗转动能力的岩石微观力学模型和相应的离散单元法商业软件,模拟了含不同预制倾角的双裂隙岩石试样在单轴压缩作用下裂纹的扩展与贯通规律,揭示了裂纹演化的宏微观机理。同时,将离散元法DEM岩石试样的裂纹的扩展和贯通规律以及强度特性与室内试验结果进行了比较分析。结果表明,预制裂隙之间以及端点处的拉应力集中是导致裂隙岩石破坏的主要原因,且DEM数值试验得到裂纹的演化规律与室内试验结果较为一致。含30°的预制裂隙的岩石试样最容易起裂,含75°的预制裂隙的岩石试样最困难起裂,造成此种现象的原因可能是裂纹在垂直于主应力方向上的长度不同导致试样受拉区域大小不同。
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| 关 键 词： | 离散单元法(DEM) 胶结模型 预制裂隙 裂纹演化机理 |
| 收稿时间： | 2013-07-24 |
Distinct element numerical analysis of crack evolution
in rocks containing pre-existing double flaw |
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| JIANG Ming-jing,CHEN He,ZHANG Ning,FANG Rui.Distinct element numerical analysis of crack evolution
in rocks containing pre-existing double flaw[J].Rock and Soil Mechanics,2014,35(11):3259-3268. |
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| Authors: | JIANG Ming-jing CHEN He ZHANG Ning FANG Rui |
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| Institution: | 1.Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
2. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;
3. Key Laboratory of Geotechnical & Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;
4. National Engineering Laboratory for Surface Transportation Weather Impact, Kunming 650011, China |
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| Abstract: | This paper presents an investigation into crack evolution in rocks containing pre-existing double flaw by distinct element method. Based on experimental data, a zero-thickness microscopic bond contact model containing rolling resistance is proposed and implemented into distinct element method commercial software. Crack propagation and coalescence in double-flawed rock samples under uniaxial compressive conditions are modeled. The mechanisms of crack propagation and coalescence are illustrated from the macroscopic and microscopic viewpoints. Simultaneously, the crack propagation and coalescence as well as strength properties measured in the Discrete Element Method (DEM) simulations are compared with the experimental observations. The results demonstrate that tensile stress concentrations between the pre-existing flaws and in their endpoints cause the instability and failure of rock samples containing pre-existing double flaw. The crack evolutions obtained from experiments and our DEM simulations are in good agreement. Rock samples containing flaw of an inclined ? =30°to the horizontal is most easily to initiate, while rock samples containing flaw of an inclined ? =75°to the horizontal is most difficult to initiate. |
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| Keywords: | discrete element method (DEM) bond model pre-existing flaw crack evolution mechanism |
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