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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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Real-in time ct test of the rock meso-damage propagation law

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Science China Technological Sciences 2001年第3期44卷 328-336页

作者：葛修润任建喜蒲毅彬马巍朱元林 1. State Key Laboratory of Frozen Soil Engineering LIGG Chinese Academy of Sciences 730000 Lanzhou China 2. Institute of Rock and Soil Mechanics Chinese Academy of Sciences 430071 Wuhan China 3. Institute of Rock & Soil Mechanics & Engineering Shanghai Jiaotong University 200030 Shanghai China 4. Xi' an University of Science & Technology 710054 Xi'an China

The real-in time computerized tomography (ct) test of the meso-damage propagation law of the whole rock failure process has been completed using the newest specified triaxial loading equipment corresponding to the ct machine. Through the ct scanning, the clear ct images which include the microholes (microcracks) compressed→growth→bifurcation→development→crack fracture →the rock sample failure→unloading in the different stress states were obtained. The ct values, ct images and other data have been analysed. The initial damage effect coefficient has been loaded, and a new damage variable based on ct value defined. The initial rock damage propagation law is given here.

关键词： rock ct test damage propagation meso-scale damage variable.

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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...

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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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Uniaxial compression ct and acoustic emission test on the coal crack propagation destruction process

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Journal of Coal Science & Engineering(China) 2013年第1期19卷 69-74页

作者： Jing-hong LIU Yao-dong JIANG Yi-xin ZHAO Jie ZHU College of Urban and Rural Construction Agricultural University of Hebei Baoding 071001 China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Beijing 100083China School of Mechanics & Civil Engineering China University of Mining & Technology Beijing 100083 China

Acoustic emission test and ct scanning are important techniques in the study of coal crack propagation. A uniaxial compression test was performed on coal samples by integrating ct and acoustic emission. The test comparison analyzes the acoustic emission load and ct images for an effective observation on the entire process, from crack propagation to the samples＇ destruction. The box dimension of the coal samples＇ acoustic emission series and the ct images were obtained through calculations by using the authors＇ own program. The results show that the fractal dimension of both the acoustic emission energy and ct image increase rapidly, indicating coal and rock mass has entered a dangerous condition. Hence, measures should be taken to unload the pressure of the coal and rock mass. The test results provide intuitive observation data for the coal meso-damage model. The test contributes to in-depth studies of coal or rock crack propagation mechanisms and provides a theoretical basis for rock burst mechanism.

关键词： acoustic emission test ct test fractal dimension destruction process

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