基于图像检索技术的岩石单轴压缩破坏过程CT描述  

CT description of rock failure process under uniaxial compression loading based on image retrieval technology

作　　者：王彦琪[1] 冯增朝[1] 郭红强[1] 赵东[1] 

机构地区：[1]太原理工大学采矿工艺研究所,太原030024

出　　处：《岩土力学》2013年第9期2534-2540,共7页Rock and Soil Mechanics

基　　金：山西省自然科学基金项目(No.2009011027-1);山西省研究生优秀创新项目(No.20093040);山西省高校优秀青年学术带头人支持计划资助(2008)

摘　　要：基于X射线的CT扫描技术,因其具有多层位、对同一岩石试件可连续、无损扫描等优点,在岩石力学与工程研究中得到了广泛应用。对岩石单轴压缩破坏过程进行实时CT扫描,也是岩石力学研究的重要内容之一。针对三维显微CT试验系统实时监测煤岩单轴压缩破坏过程中,因位移误差会引起扫描层定位不准确,进而影响试验结果这一基本问题,提出了基于图像检索技术的CT扫描图像处理方法。通过对煤岩试样在单轴载荷作用下破坏过程的CT实时监测,并引入基于Manhattan距离的相似性计算方法,检索出岩石试件同一层位在不同应力状态下的相似扫描层。结果表明,采用图像检索的方法,可以有效地减小煤岩在加载破坏过程中位移误差的影响,更好地通过CT图像来描述煤岩在不同应力状态下的微裂纹分布状况和演化规律,从而在细观层次上揭示岩石在单轴压缩条件下破坏的基本规律。The CT scanning technology based on the X-Ray, which can scan a rock specimen through multilayer continuously and nondestructively, has been introduced into the study of the rock mechanics and engineering widely. It is one of the important content of rock mechanics research, to monitor the failure processing of rock sample under uniaxial compression loading by CT technology. During the 3D microscope CT real-time monitoring of rock condition under uniaxial compression loading, there will be some error caused by the imprecise positioning of the CT scanner device. Aiming at this imperfection, a new CT slice image processing method based on image retrieval （IR） technology, is proposed. Coal and rock sample under uniaxial compression loading, is monitored during its failure process, and with the similarity computing method based on the Manhattan distance measure introduced, the rock sample＇s CT image and its similar-slices of different stress stages are retrieved. The results show that： The IR technology may effectively reduce the error due to the displacement during the coal and rock failure process; with the help of CT slice image, microcrack distribution and evolution rule of the coal and rock samples in different stress stages, can be preferably described; moreover, at mesoscopic level, the basic law of coal and rock failure process under the uniaxial compression loading, get further revealed.

关 键 词：岩石力学 单轴压缩 图像检索技术 小试件 显微CT 细观层次 

分 类 号：TU452[建筑科学—岩土工程]