Meso Mechanical Mechanism Study of Coals Strength Characteristics
Coal is a kind of rocky minerals which deposited and evolved from ancient corrupted plants in surface, and it was influenced by the ancient climate and deposition environment. All these resulted in the coals complexity and variety in meso structure and constitution in coal seam. There are a large number of grain cements and weak structure faces such as micro holes, micro cracks, stratifications and joints, and so on. Coal is a kind of typical microscopic non-homogeneousness, and its macroscopic mechanical parameters are closely related to original microscopic structures. Study of the correlation between the microscopic structure and the strength and deformation of coal contributes to a profound understanding of coals strength and deformation characteristics in the meso level. Area rate of micro holes and micro cracks in coal can be expressed by damage variable. Tests on mechanical property and scanning electron microscope tests of coal samples indicate that the original damage variable is quite different with coal types. Original damage variable influences the macroscopic mechanical parameters of coal deeply. Tests results indicate that coals damage variable Ω increases by 38.4％, its uniaxial compressive strength decreases by 33.3％, and elastic modulus decreases by 30.8％.
coal strength pores and cracks meso mechanical mechanism damage variable
YANG Yong-jie CHU Jun WANG De-qing ZHAO Guangxin
Key Laboratory of Disaster Prevention and Control, Shandong University of Science and Technology, Qi Shandong Dalian mining Project Ltd., Taian 271019, Shandong, China
国际会议
The 2007 International Symposium on Safety Science and Technology(2007采矿科学与安全技术国际学术会议)
河南焦作
英文
564-570
2007-04-17（万方平台首次上网日期，不代表论文的发表时间）