Reinforcement and control technology of surrounding rock in gob-side entry retaining with coal gangue concrete
Based on the engineering background of gob-side entry retaining in Shendong mining area,the ratio of coal gangue concrete was optimized by means of theoretical analysis,laboratory test and numerical simulation,and the characteristics of surrounding rock deformation and reinforcement stress distribution in the mining process were analyzed.The results show that the surrounding rock deformation can be controlled and stability of the retained entry can be maintained using the coal gangue concrete reinforcement for roadway sides,and the combined support of high prestress strong bolt and cable.According to the results of the laboratory test and numerical simulation,ratio of coal gangue concrete,and the connection among supports inside and beside roadways,the optimal supporting plan was obtained.The design principle for supports in gob-side entry retaining was proposed,thus to provide a scientific basis for non-pillar mining in Shendong mine area.The support technology was optimized for gob-side entry retaining,and a reference was provided for similar engineering geological conditions.
gob-side entry retainingcoal gangue concretemix ratiosurrounding rock supportnumerical simulation
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