Meso-damage cracking characteristics analysis for rock and soil aggregate with CT test
作者单位：Key Laboratory of Engineering GeomechanicsInstitute of Geology and GeophysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences
会议名称：《中国科学院地质与地球物理研究所2014年度（第14届）学术年会》
会议日期：2015年
学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）]
基 金：supported by the National Natural Science Foundation of China(Grants Nos.41227901,41027001,and 41027001) the Strategic Priority Research Program of the Chinese Academy of Sciences(Grants Nos.XDB10030000,XDB10030300 and XDB10050400)
关 键 词：rock and soil aggregate(RSA) CT test CT value meso-damage mechanism cracking mechanism
摘 要：The aim of this paper is to investigate the damage cracking characteristics of rock and soil aggregate(RSA) by X-ray computed tomography(CT) under uniaxial compressive *** mean CT value for the region of interest(ROI) is used to analyze the cracking ***,the mathematical morphology method based on the image threshold segmentation is used to obtain characteristic parameters of cracks to describe the cracking evolution of *** show that the elastic mismatch between rock blocks and soil matrix is the primary reason for RSA *** mean CT value for the RSA specimen,rock block inclusions,and their adjacent soil regions decreases with the increasing stress ***,it is more sensitive for block inclusions than soil *** the image segmentation method,length,area and mean width of cracks obey to power function *** statistical characteristics are closely related to the rock block’s distribution and *** results may be useful to reveal the mesoscopic cracking mechanism,establish meso-damage evolution equation,and constitutive relation for RSA.