煤样力学特性与内部裂隙演化关系CT实验研究  

Experimental study on relationship between coal mechanical characteristics and interior crack evolution using CT technique

作　　者：毛灵涛[1] 安里千[1] 王志刚 石鹏[1] 商雅楠[1] 

机构地区：[1]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]保定华翼风电叶片研究开发有限公司技术部,河北保定071051

出　　处：《辽宁工程技术大学学报（自然科学版）》2010年第3期408-411,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：国家"973"计划基金资助项目(2005cb221502);教育部博士点新教师基金资助项目(20070290010);北京市优秀博士论文指导教师基金资助项目(YB20081141301)

摘　　要：为了观测煤样内部结构变化和裂隙演化过程,应用X射线工业CT对煤样在单轴加载不同阶段进行了扫描,获取了不同应力状态下CT图像。通过CT图像及其差值图像的统计特征值,分析了煤岩内部裂隙演化与宏观变形间的关系。分析表明:煤样CT图像灰度统计特征值的变化反映试件内部的密度变化,间接反映了试样中裂隙的发育发展过程;将CT图像中每个体素作为研究对象,CT的差值图像表征了试件内部裂隙缺陷体积的演化;CT差值图像的均值与方差更能体现宏观变形不同阶段内部裂隙的相应变化。In order to observe interior structure variation and crack evolution,coal samples under different axial load were scanned using X-ray industrial CT,and the CT images under different stresses were obtained.Based on the statistical analysis on the characteristic values of the CT images and the differences among images,the relationship between rock interior crack evolution and macro-deformation was investigated.The results show that the grey statistical characteristic value variations of CT images indicate the density alteration,which indirectly reflect the crack development.The differences among images characterize the volume evolution of interior crack deflects according to each voxel.The mean and variance of the image differences better describe the relationship between interior crack variation and macro deformation under different stresses.

关 键 词：煤样力学特征 单轴加载 裂隙演化 工业CT 

分 类 号：TU452[建筑科学—岩土工程]