Experimental and numerical study of coal-rock bimaterial composite bodies under triaxial compression
Yulong Chen1
Jianping Zuo2
Dejun Liu3
Yingjie Li3
Zhenbo Wang3
1.State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Beijing 100083,China;School of Energy and Mining Engineering,China University of Mining and Technology,Beijing 100083,China2.State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China3.School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China
摘要：To accurately predict coal burst hazards and estimate the failure of coal pillars in underground coal mining systems,it is of great significance to understand the mechanical behavior of coal-rock bimaterial composite structures.This paper presents experimental and numerical investigations on the response of rock-coal,coal-rock,and rock-coal-rock bimaterial composite structures under triaxial compression.The triaxial compression experiments are conducted under confining pressures in the range of 0-20 MPa.The resulting inside fracture networks are detected using X-ray-based computed tomography (CT).The experimentally observed data indicate that the mechanical parameters of the rock-coal-rock composites are superior to those of the rock-coal and coal-rock combinations.After compression failure,the coal-rock combination specimens are analyzed via X-ray CT.The results display that the failure of the coal-rock composite bodies primarily takes place within the coal.Further,the bursting proneness is reduced by increasing confining pressure.Sub-sequently,the corresponding numerical simulations of the experiments are carried out by using the particle flow code.The numerical results reveal that coal is vulnerable with regard to energy storage and accumulation.
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论文发表日期：2021-10-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：17( 908-924 )
英文信息