NON-PILLAR AUTOMATICALLY FORMED ROADWAY-BASED MINING METHOD APPLICABLE TO FULLY MECHANIZED TOP-COAL CAVING OF THICK COAL SEAM

摘要

A non-pillar automatically formed roadway-based mining method applicable to fully mechanized top-coal caving of a thick coal seam, comprising: reinforcing and supporting a roof and two sides of a roadway; slotting and blasting a construction roof to form pre-split cracks; erecting a temporary supporting device and a block gangue device in the roadway along a retained entry; not performing coal caving within a preset distance near a working face end of an entry retaining side; after the roadway formed is stabilized, removing the temporary supporting device in the roadway, and closing a goaf, so that entry retaining is completed. The roof slotting and blasting facilitate the caving of a rock stratum in the goaf, so that a stoping space can be well filled after the rock stratum in the slot is caved, a short arm beam structure is formed in the lateral direction of the entry-retaining roof, the formation of a long suspended roof in the goaf is avoided, and the surrounding rock stress of the gob-side retained entry is improved. Coal caving is not performed within a certain range of the working face end of the entry retaining side, the filling effect of the empty area of the entry retaining side is further ensured, rotary sinking of basic roof block bodies is effectively restricted, and the impact on the entry retaining stability is reduced.