Surrounding Rock Control of Upper Coal Seam Mining Roadway in Dianping Coal Mine
In order to study the surrounding rock control technology of upper coal seam up-mining roadway,taking 3-3032 roadway of Dianping Coal Mine as the engineering background,the spatial relationship of coal layer groups and the height detection of water-conducting fracture zone was investigated and tested,and the mechanical analysis of coal mining above hollow in upper coal group was further carried out to determine the reasonable location of roadway layout,and the targeted support scheme was put forward.The results show that the development height of the overlying rock fracture zone of 9#coal seam was detected by using the segmentation water(gas)detection method of underground drilling,and the height of the water-conducting fracture zone was 51.84 m;by comparing the layer spacing,the influence of the lower coal seam mining on upper coal seam was clearly defined,and the influence area of the coal mining strike boundary of the lower group coal was further obtained to be 78.3 m.The superimposed support form of high prestressed strong bolt+anchor cable was proposed,which can effectively improve the reliability of the surrounding rock during the service of the roadway and ensure the safe production of the working face.
up-miningupper coal seammining roadwaysurrounding rock controlsupport scheme
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