冻融岩石CT图像处理及细观特征分析  

CT image processing and mesoscopic characteristics analysis of freeze-thaw rock

作　　者：张慧梅[1] 袁超[2] 慕娜娜 张婵 路亚妮 ZHANG Huimei;YUAN Chao;MU Nana;ZHANG Chan;LU Yani(College of Sciences,Xi’an University of Science and Technology,Xi’an 710054,China;College of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;School of Civil Engineering,Hubei Engineering University,Xiaogan 432000,China)

机构地区：[1]西安科技大学理学院,陕西西安710054 [2]西安科技大学建筑与土木工程学院,陕西西安710054 [3]湖北工程学院土木工程学院,湖北孝感432000

出　　处：《西安科技大学学报》2022年第2期219-226,共8页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金项目(12172280,42177144,42077274,41907259,12072259);陕西省自然科学基金重点资助项目(2020JZ-53)。

摘　　要：针对寒区煤矿巷道工程出现的冻融灾害问题,以冻融煤矿砂岩CT图像为研究对象,采用中值滤波和直方图均衡化等技术对图像进行处理。结合分形理论,研究分形维数随冻融次数的变化规律,分析冻融作用下煤矿砂岩的细观损伤演化规律。结果表明:通过对CT图像进行中值滤波和均衡化等预处理,可以有效降低图像噪声,提高图像分辨率;随着冻融次数的增加,不同截面的CT图像分形维数均呈现降低趋势,且不同冻融次数下的分形维数曲线具有相同的波动形式;冻融损伤可分为孔隙率增加导致的有效面积损伤和孔隙空间分布变化引起的结构性损伤,两者的耦合作用共同导致岩石性能的劣化。从细观角度出发,研究冻融作用下煤矿砂岩的损伤演化规律,为分形理论在岩石损伤方面的应用提供思路。In order to cope with the freezing and thawing disasters in coal mine roadway engineering in cold areas,CT images of freeze-thaw coal mine sandstones are taken as the research object,and the image processing techniques are adopted to process images such as median filtering and histogram equalization.With fractal theory in view,the changing law of fractal dimension with the freeze-thaw cycles is discussed,and the meso-damage evolution law of coal mine sandstone under freeze-thaw action is analyzed.The results show that by preprocessing the CT images such as median filtering and equalization,the image noise can be effectively reduced and the image resolution can be improved;with the increasing of freeze-thaw cycles,the fractal dimension of CT images of different cross-sections all show a decreasing trend,and the fractal dimension curves under different freeze-thaw cycles have the same wave form;freeze-thaw damage can be divided into effective area damage caused by increased porosity and structural damage caused by changes in pore space distribution,and the coupling of the two leads to the deterioration of rocks.This article,from a mesoscopic perspective,analyzed the damage evolution law of coal mine sandstone under freezing and thawing,which provides ideas for the application of fractal theory in rock damage.

关 键 词：冻融循环 CT图像 图像处理 分形维数 损伤演化 

分 类 号：TU452[建筑科学—岩土工程]