|
|||||
|
|
| 基于X射线CT的岩石内部裂纹宽度测量 | |
| 引用本文： | 丁卫华,仵彦卿,蒲毅彬,曹广祝,崔中兴.基于X射线CT的岩石内部裂纹宽度测量[J].岩石力学与工程学报,2003,22(9):1421-1425. |
| 作者姓名： | 丁卫华 仵彦卿 蒲毅彬 曹广祝 崔中兴 |
| 作者单位： | 1. 西安理工大学水利水电学院,西安,710048 2. 西安理工大学水利水电学院,西安,710048;中国科学院寒区旱区环境与工程研究所国家冻土工程重点实验室,兰州,730000 3. 中国科学院寒区旱区环境与工程研究所国家冻土工程重点实验室,兰州,730000 |
| 基金项目： | 国家自然科学基金(10172071)，陕西省教育厅专项科研计划(No.00JK218，No.01JK146)资助项目。 |
| 摘 要： | 岩石内部裂纹变形、扩展和扩张是试样在裂纹演化阶段的主要过程。研究基于X射线CT的岩石内部裂纹宽度测量问题，根据岩石变形破坏的细观机制，分析了岩石密度损伤与体应变的关系。对脆性岩石来说，岩石的体积变形与其密度损伤有一一对应关系。基于X射线密度损伤增量公式，推导出岩石体应变公式，得到岩石内部裂纹宽度的普适性计算公式。据此测得岩石中两条CT尺度裂纹在不同应力阶段的宽度，并与有关公式进行了比较，相互得到验证。说明在动态条件下岩石内部裂纹宽度测量问题在理论上可以得到解决。 |
| 关 键 词： | 断裂力学 CT尺度裂纹 X射线 裂纹宽度 测量 裂纹变形 |
| 文章编号： | 1000-6915(2003)09-1421-05 |
| 收稿时间： | 2002-9-17 |
| 修稿时间： | 2002年9月17日 |
MEASUREMENT OF CRACK WIDTH IN ROCK INTERIOR BASED ON X-RAY CT |
|
| Ding Weihua,Wu Yanqing,Pu Yibin,Cao Guangzhu,Cui Zhongxing.MEASUREMENT OF CRACK WIDTH IN ROCK INTERIOR BASED ON X-RAY CT[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(9):1421-1425. | |
| Authors: | Ding Weihua Wu Yanqing Pu Yibin Cao Guangzhu Cui Zhongxing |
| Affiliation: | Ding Weihua1,Wu Yanqing1,2,Pu Yibin2,Cao Guangzhu1,Cui Zhongxing1 |
| Abstract: | The deformation,propagation and expansion of crack in rock interior are the main mechanical process when the rock sample comes to its crack evolution stage. It is the subject of this paper how to detect the crack width through X-ray method. The relation between rock density damage and its volumetric strain is analyzed based on the meso-mechanism of rock deformation and rupture. For brittle rock,its volumetric strain has a unique quantitative relation with its density damage. Based on the increment formula of density damage,the volumetric strain formula is derived for rock. The universal calculation formula of crack width in rock interior is derived based on the volumetric strain formula. The formula is tested and compared with relative formula. The same results are obtained from the two different formulas. Two crack widths in rock interior under different stresses are calculated. As a result the problem how to measure a real-time crack width in rock interior is solved theoretically. The crack width of sandstone is no more than the order of magnitude of 10-1mm. It is verified that the actual crack width is not the same as the crack width in its CT image. Before the maximum strength,the crack width of sandstone has a stable expansion process. When the longitudinal and lateral deformation of rock sample are considered,this result can be verified indirectly. |
| Keywords: | fracture mechanics crack in X-ray CT scale density damage increment volumetric strain formula crack width crack deformation |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |
| 点击此处可从《岩石力学与工程学报》浏览原始摘要信息 | |
| 点击此处可从《岩石力学与工程学报》下载全文 | |
