|
|||||
|
|
| 岩石材料内部特征尺度对裂纹扩展机制的影响 | |
| 引用本文： | 刘彩平,鞠杨,段庆全.岩石材料内部特征尺度对裂纹扩展机制的影响[J].岩土力学,2010,31(Z1):91-95. |
| 作者姓名： | 刘彩平 鞠杨 段庆全 |
| 作者单位： | 1. 北京科技大学,土木与环境工程学院,北京,100083;中国矿业大学,煤炭资源与安全开采国家重点实验室,北京,100083 2. 中国矿业大学,煤炭资源与安全开采国家重点实验室,北京,100083 3. 中国石油大学(北京)机械与储运工程学院,北京,102249 |
| 基金项目： | 973国家重点基础研究发展计划，教育部博士点基金新教师课题，煤炭资源与安全开采国家重点实验室开放基金 |
| 摘 要： | 为考察岩石材料细观结构特征对于裂纹扩展机制的影响,首先借助偏光显微镜和SEM观测了3类岩石材料中材料内部组织结构,分析了各自非均质程度和晶粒大小关系。之后,对3类岩石的带I型初始裂纹的3点弯曲试样进行了落重冲击试验,同时采用高速摄影获得了不同裂纹速度下的裂纹扩展形态。将这些结果对照分析,研究了3类岩石中裂纹扩展过程与各自材料组织结构的非均质程度和晶粒大小的关系,得出初步结论:组织结构内部特征尺度越大,动态裂纹所能达到的终极速度就相对越小。反之亦然。 |
| 关 键 词： | 岩石 非均质性 裂纹扩展速度 微开裂过程区 内部特征尺度 |
| 收稿时间： | 2010-04-21 |
Influence of internal characteristic length scale on dynamic crack propagating mechanism in rock materials |
|
| LIU Cai-ping,JU Yang,DUAN Qing-quan.Influence of internal characteristic length scale on dynamic crack propagating mechanism in rock materials[J].Rock and Soil Mechanics,2010,31(Z1):91-95. | |
| Authors: | LIU Cai-ping JU Yang DUAN Qing-quan |
| Institution: | 1. School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing, 100083,China; 3. School of Mechanical and Transportation Engineering, China University of Petroleum, Beijing 102249, China |
| Abstract: | In order to find how the mesostructure character of rock influences the crack propagation, the heterogeneity degree, grain size in limestone, marble and granite gneiss samples were examined respectively by means of scanning electronic microscope(SEM) and polarizing microscope. Then, the three-point bending samples with an pre-existing mode I crack were impacted by drop-weight and the cracking modes of above-mentioned three types of rocks were captured by high speed photography. By contrast, there is largest microcracking area ahead the crack tip in the granite gneiss samples with the highest heterogeneity, so is the lowest dimensionless ultimate crack velocity during the dynamic fracture process. On the contrary, since the lowest heterogeneity of the limestone samples, the smallest microcracking zone and highest dimensionless crack velocity were obtained. In this regard, there should be an internal characteristic length scale that domains the ultimate crack speed in rocks: the larger length scale is, the lower crack velocity limit would be. |
| Keywords: | rock heterogeneity crack velocity microcracking propagation zone internal characteristic length scale |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |
| 点击此处可从《岩土力学》浏览原始摘要信息 | |
| 点击此处可从《岩土力学》下载免费的PDF全文 | |