School of Mechanics and Engineering, Liaoning Technical University
Liaoning Key Laboratory of Mining Environment andDisaster Mechanics, Liaoning Technical University
Institute of Disaster Rock Mechanics, Liaoning University
China Coal Technology & Engineering Group Corp., Shenyang Research Institute
State Key Laboratory ofCoal Mine Safety Technology

The uniaxial compression test of coal and rock combination was carried out in order to clarify the influencemechanism of the contact surface mechanical properties on the rock-burst tendency of the coal rock combination, and thecontact surfaces with four different mechanical properties were considered. The variation laws of strength, elastic modulus,strain softening phenomenon, acoustic emission characteristic signal, energy accumulation and dissipation characteristics, and impact tendency of coal rock combination were analyzed. The influence mechanism of end face effect causedby the bonding properties and failure of contact surface on local deformation characteristics and strength of coal and rockwas studied. The results show that the mechanical properties of the contact surface have a certain influence on the mechanicalproperties of the coal rock combination. The complete contact surface enhances the strength and elastic modulus of thecoal rock combination, improves the elastic energy accumulation ability, inhibits the sample fracture in the pre-peak stage,and weakens the strain softening stage after the peak. The failure of the contact surface reduces the influence of the endfaceeffect, improves the failure degree of the coal rock combination, prolongs the post-peak strain softening process, andthe strain energy density in the pre-peak stage is mainly plastic dissipation. The mechanical indexes of unbonded coal rockcombination samples are lower than that of others. The constitutive relationship of coal rock combination is established,and the strength estimation method considering the contact surface failure, and the determination method of contact surfacefracture are proposed. The theoretical calculation results are consistent with the experimental results. With the improvementof mechanical properties of rock coal interface, the proportion of elastic energy of combined coal increases, andthe proportion of plastic property decreases. The influence law of the mechanical properties of rock coal contact surface onthe rock burst tendency of coal rock combination is clarified. It is considered that the relative mechanical propertiesbetween the contact surface and coal is an important factor which causes the conflict of various indexes of coal rock combinationrock burst tendency.

国家自然科学基金资助项目(51974186, 51974147)；辽宁工程技术大学学科创新团队资助项目(LNTU20TD-17)

樊玉峰，肖晓春，丁鑫，等. 岩煤接触面力学性质对组合煤岩力学行为影响机制[J]. 煤炭学报，2023，48(4)：1487−1501

FAN Yufeng，XIAO Xiaochun，DING Xin，et al. Influence mechanism of contact surface mechanical properties on mechanical behavior of coal rock combination[J]. Journal of China Coal Society，2023，48(4)：1487−1501