Roof Cutting and Pressure Relief Technology of Thin Seam Coal Face in Xinhongfa Coal Mine
Taking the mining of thin coal seam and high gas coal face in Guizhou as the engineering background,in order to improve the recovery rate of coal resources at the mining face,relieve the tension of mining replacement and reduce the cost of roadway excavation,the technology of roof cutting and pressure is proposed to be applied to roadway retention.According to the geological condition and layout of 1k302 transportation lane in Xinhongfa Coal Mine,the construction technology of top cutting and unloading pres-sure relief retaining roadway on the working face of thin coal seam are introduced,and the effect top cutting and pressive relief is analyzed by monitoring the subsidence of roof.The engineering application shows that the roadway retention technology scheme adopted in 1k302 transport lane has remarkable effect,and the maximum subsidence of the roof in the roadway retention section is controlled within 146.4 mm,and the roadway retention effect is remarkable,which creates good conditions for safe and efficient coal mining in the mine.
thin coal seamsemi-coal rock roadwaytop cutting pressure reliefgob-side entry retain-ing
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