Abstract
The failure of layered rock in underground mining face may be influenced by the slipping among the layers. The shear failure around the excavation circular roadway is the main failure type in layered rock. To Study the rock failure in layered rock, the condition of bedding slipping in rock is analyzed, and the stresses distribution around circular roadway is calculated. Based on the analysis results, the Flac 3D software is used to analyze the failure of layered rock in roadway floor. Discontinuous interfaces are created to study the effect of bedding planes. The failure of floor is described at two phases: roadway stability phase and mining-face recovery influencing phase. The results indicate that a shear failure surface occurs at the side of coal pillar during the first phase; a shear arched plane occurs at the side of mining-face during the second phase. The results of numerical model are in good agreement with monitoring data. Finally, bolts reinforcement design is proposed to eliminate the development of failure zone in layered rock.
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