摘要
外荷作用下岩石中裂纹扩展过程与不同矿物成分形状变化具有一定关系.本文以花岗岩为例,根据室内单轴压缩试验视频,使用灰度阈值分割方法和形状判别方法,探讨裂隙位置不同矿物形状参数变化与裂隙扩展的关系.结果 表明,长石是主要受力成分,裂隙位置长石区域在受力过程中形状参数变化较大;裂隙附近长石在裂隙出现前后形状参数变化较大,承担了很大的应力;远离裂隙长石在加载过程中形状参数变化较小,承受了轴向力的主要部分.研究成果对分析岩石中裂隙的扩展特点具有重要参考价值.
The propagation of cracks of a rock is related to the changes in shape of various mineral compositions in the rock under external load.In this study,based on the indoor uniaxial compression test video with the methods of the grayscale threshold segmentation and shape discriminants,the relationships between the crack extension and variations of the shape parameters for the minerals apart of granite from the crack locations were then explored.It showed that the shape changes of the feldspar areas were much depended on the actual locations.The shape parameter of the feldspar areas in the crack locations varied greatly in the loading process.The shape changes of the feldspar areas near the crack locations varied greatly with the emergence of new crack due to the greater stress concenterated in the feldspar regions.The feldspar areas far from the crack locations changed a little in the loading process for suffering the main axial force.The results in the current study may be referable in analyzing the propagation features of the cracks in a rock.
作者
涂齐亮
董福云
Tu Qiliang;Dong Fuyun(China Railway 17^th Bureau Group Co.Ltd.,Taiyuan Shanxi 030006,China)
出处
《铁道建筑技术》
2019年第11期1-5,共5页
Railway Construction Technology
基金
中国铁路总公司科技研究开发计划项目(2017G006-B)
中国铁建股份有限公司科技研究开发计划项目(17-C13)
关键词
花岗岩
形状变化
裂纹扩展
关系
试验
granite
shape change
crack propagation
relation
test
