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meso-damage cracking characteristics analysis for rock and soil aggregate with CT test

Science China(Technological Sciences) 2014年第7期57卷 1361-1371页

作者： WANG Yu LI Xiao ZHANG Bo WU YanFang Key Laboratory of Engineering Geomechanics Institute of Geology and Geophysics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

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.

关键词： rock and soil aggregate(RSA) CT test CT value meso-damage mechanism cracking mechanism

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Experimental study on meso-damage cracking characteristics of RSA by CT test

Experimental study on meso-damage cracking characteristics o...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Y.Wang X.Li Y.F.Wu C.Lin B.Zhang Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of Sciences

This paper investigates the meso-damage mechanism and the cracking characteristics of rock and soil aggregate(RSA)by X-ray computed tomography(CT)under uniaxial compressive *** RSA specimens(50 mm diameter and 100 mm height)with rock percentage 40%were produced to perform a series of uniaxial compressive strength *** damage cracking characteristic is identified by the mean CT value,and also the meso-damage propagation law is analyzed based on the damage factor defined by the CT *** the test results,the variation of CT value for region of interest is different at the same stress level,the mean CT value for the RSA specimen,and rock block inclusions,and their adjacent soil regions decrease with the increasing stress *** is more sensitive for block inclusions than soil ***,the meso-damage evolution equation and constitutive equation for RSA are *** estimated result is in agreement with the measured ***,based on the image threshold 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 confirm that the elastic mismatch of RSA is the primary reason resulting in cracking under loading,damage characteristics of RSA is progressive,cracking begins from rock-soil interfaces,and then propagate into soil matrix.

关键词： Rock and soil aggregate(RSA) X-ray tomography CT value meso-damage mechanism Cracking evolution

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meso-damage cracking characteristics analysis for rock and soil aggregate with CT test

Meso-damage cracking characteristics analysis for rock and s...

引用

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

作者： WANG Yu LI Xiao ZHANG Bo WU YanFang Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences

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.

关键词： rock and soil aggregate(RSA) CT test CT value meso-damage mechanism cracking mechanism

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