Study on manifestation law and control technology of mine pressure through empty roadway of fully-mechanized caving face of extra thick coal seams
To study the manifestation law and control technology of mine pressure through empty roadway of fully-mechanized caving face of extra thick coal seams,through empty roadways of the No.8202 working face of Xiaoyu Coal Mine was taken as the background.By es-tablishing a numerical calculation model for the oblique intersection through empty roadways in fully-mechanized caving face,according to the advancing position of the working face,it was divided into preparation stage,through empty roadway stage,and through empty roadway end stage.This approach was used to analyze the characteristics of mining induced rock pressure manifestation.Based on the original de-sign,the empty roadway reinforcement supporting technology was proposed,and it has been successfully verified through on-site practice.The results showed that as the working face gradually approached the empty roadway,the impact of mining disturbance on the empty road-way became increasingly significant.At a distance of 10 m from the empty roadway,significant deformation occured due to concentrated stress.When advancing to the empty roadway,the roof of the empty roadway collapsed directly,requiring rapid passage of the working face to avoid excessive hanging roof distances.Different reinforcement and supporting technologies were proposed,and production process opti-mization and metal mesh roof paving were carried out in special areas.The on-site application effect was analyzed,and this supporting method can quickly pass through double empty roadways in the working face.The findings of this study can provide a reference for similar coal seam conditions.
extra thick coal seamempty roadwaymine pressure manifestationreinforcement supporting
万方数据
维普
