Solid-filling coal mining method with two pre-excavated tunnels for advancing

摘要

A solid-filling coal mining method with two pre-excavated tunnels for advancing. A mining roadway adopts an arrangement mode that the pre-excavated tunnels are taken as air return and inlet roadways and a gob-side entry retaining roadway is taken as a roadway for transporting filling materials and coal; coal extraction and gob backfilling are carried out by a comprehensive mechanical solid-filling coal mining process; and a coal mining method that a mining sequence is propelled by making a filling coal mining working face be back to the direction of transporting the coal to a mountain in a mining area is used. The pre-excavated tunnels are formed, by tunneling, before the extraction of the working face, and the gob-side entry retaining roadway is formed by optimally designed filling bodies beside the roadway along with the implementation of advancing filling coal mining operation along the working face. The coal mining method is simple in process, technically and completely realizes coal milling without pillars, and achieves high coal resource extraction rate. The coal mining method can not only solve the technical problems that a draw-back-type down-mining and up-filling working face cannot ensure a filling effect during a filling milling process of a mine with shortage of resources, but also materialize the comprehensive mechanical solid-filling coal mining of mines with limited geological conditions by virtue of an advancing up-milling and down-filling working face.