Study On The Gob-side Entry Driving Technology Under The Complicated Geological Condition In Linxi Mine Of Kailuan

Parameter optimization of gob-side entry driving to preparation roadway of coal mine is a core technical problem of deformation effective control roadway supporting,especially for complicated geological conditions, including large mining depth, high stress, fault joint fracture development of roof, superposition of mining dynamic pressure and so on. It is with great significance to make gob-side entry driving of regional seam roadway come true to greatly decrease drivage rate, resolve linking up digging, and achieve safe and efficient mine production.With the background of 1773 working face in kailuan linxi mine-850 m 11 level7 crosscut regional, on the basis of investigation of regional seam hosting and mining condition. FLAC3 D simulation, in accordance with ground pressure and control key stratum theory, was used to research the key rock structural characteristics and force condition, as well as the stability condition of the key rock under different stage, the force condition and destruction causes of the surrounding rock, so that the design of rectangular section was determined, with the reasonable size of coal pillars is 8m, the time of excavation construction stoping is 6 to 8 months. The mechanical property of coal pillar was strengthened by slip casting and anchor net, steel strip and slip casting were used jointly to support the roadway of Lin Xi.This supporting technology was applied to the development drifts of 1773 working face. The construction management, roadway deformation monitoring, date analyzing and processing and molding effect were analyzed with the statistical method. It is indicated that the application of this technique controls the deformation of the underground roadway under the complicated geological condition effectively; the excavation rate is reduced; coal recovery rate is improved and contradiction between the mining and digging is released..