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《Journal of China Coal Society》 2006-02
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Test study of coal's strength and deformation characteristics under triaxial compression

YANG Yong-jie,SONG Yang,CHEN Shao-jie (College of Resource and Environment Engineering,Shandong University of Science and Technology,Qingdao 266510,China)  
The conventional triaxial compression test of No.3 coal seam of Baodian Colliery was carried out with MTS815 servo-controlled rock mechanical test system and the strength and deformation characteristics were analyzed.The experimental results indicate that under the confining compression,fissures close due to the large quantity of micro fissures,and the modulus increase with it,but presents nonlinear relation.Under general triaxial compression,and triaxial compression strength of coal specimens and confining compression have good linear relation(the case of uniaxial compression excluded),when the confining compression is less than maximum experimental compression,the destroy of coal mine fits the Coulomb criterion,but because of the obvious heterogenity of coal specimens,there are large quantity of flaws such as random fissures,and the cohesion is low,it is most possible for the random fissures of coal specimens deviate from θ=45°+/2.
【Fund】: 国家自然科学基金资助项目(50474029)
【CateGory Index】: TD315
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