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| 砂岩断裂及其亚临界断裂的力学行为和细观机制 | |
| 引用本文： | 何满潮,胡江春,王红芳,段庆全.砂岩断裂及其亚临界断裂的力学行为和细观机制[J].岩土力学,2006,27(11):1959-1962. |
| 作者姓名： | 何满潮 胡江春 王红芳 段庆全 |
| 作者单位： | 1. 中国矿业大学(北京)力学与建筑工程学院,北京,100083 2. 中国矿业大学(北京)力学与建筑工程学院,北京,100083;中原工学院,土木建筑工程系,郑州,450007 3. 中原工学院,材料与化学工程系,郑州,450007 4. 中国石油大学(北京)机电工程学院,北京,102249 |
| 基金项目： | 国家自然科学基金;国家自然科学基金;教育部科学技术研究重点项目 |
| 摘 要： | 通过三点弯曲的SEM试验，详细研究了砂岩断裂的力学特征和细观机制。结果表明：砂岩断裂足一个复杂的过程，它不但与砂岩的物理成分、微缺陷等有关，还与砂岩中碎屑颗粒的分布密切相关，存在明显的亚临界断裂。亚临界断裂裂纹和断裂辛裂纹形态相似。亚临界断裂裂纹较多的样品呈现延性断裂破坏的特征，而弧临界断裂裂纹较少的样品则呈现脆性断裂破坏的现象。 |
| 关 键 词： | 砂岩 断裂力学 亚临界断裂裂纹 细观试验 力学行为 |
| 文章编号： | 1000-7598-（2006）11-1959-04 |
| 收稿时间： | 2005-02-23 |
| 修稿时间： | 2005-07-11 |
Mesomechanism of fracture process and subcritical fracture in sandstone |
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| HE Man-chao,HU Jiang-chun,WANG Hong-fang,DUAN Qing-quan.Mesomechanism of fracture process and subcritical fracture in sandstone[J].Rock and Soil Mechanics,2006,27(11):1959-1962. | |
| Authors: | HE Man-chao HU Jiang-chun WANG Hong-fang DUAN Qing-quan |
| Institution: | 1. School of Mechanics & Architecture Engineering, China University of Mining & Technology, Beijing 100083, China; 2. Department of Civil Engineering and Architecture, Zhongyuan University of Technology, Zhengzhou 450007, China; 3. Department of Materials and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; 4. Faculty of Mechanical and Electrical Engineering, China University of Petroleum, Beijing, 102249, China |
| Abstract: | The morphology of sandstone fracture main crack and subcritical fracture crack(that growth due to stress concentration but not turn into fracture main crack)in mesoscale level have been systematically investigated through the three-point bending fracture test with scanning electron microscope(SEM).It is shown that the fracture of sandstone behaved complicatedly,and correlated with not only the composition of sandstone binding material but also the distribution of sandstone fragmentary particle.Furthermore,there give birth to many subcritical fracture cracks in the fracture process.The morphology of fracture main crack and subcritical fracture crack is similar.Ductile fracture has been taken place if the specimen has many subcritical fracture cracks in the fracture process zone.Contrary that brittle fracture will be taken place. |
| Keywords: | sandstone fracture mechanics subcritical fracture crack three-point bending fracture test |
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