Method for recovery of room-type coal pillar through loess filling

Abstract

The invention discloses a method for recovery of a room-type coal pillar through loess filling. Along the vertical section laneway direction, formed channels in mined coal rooms are taken as an arrangement form of coal transport lanes and material transport lanes; two adjacent coal pillars are arranged to be a stope face, a row of coal pillars are retained between adjacent stope faces as a partition wall; The recovery of coal pillars employs a blasting technology, loess of ground is taken as a filling material of mined-out area, the backfill of the mined-out area is carried out through a way of cooperation operation of high-speed power throwing machines and bulldozers, A room-type remaining coal pillar is replaced by a compact loess filling body for supporting the mined-out area roof. The method recovers precious coal resource, lowers great resource waste caused by room-type mining, and provides a new technical approach for mines with similar conditions in our country.

Description

technical field [0001] The invention relates to a method for recovering a room-type coal pillar, in particular to a method suitable for filling and recovering a room-type coal pillar with loess with a width of 8-12 m left over from coal mining in a coal mine. Background technique [0002] Many mining areas such as the Ordos Coal Basin and the Shenfu Coalfield in my country have been using the room-type coal mining method for a long time. The biggest disadvantage of this method is that only the coal mining room is used, and no coal pillars are used. According to incomplete statistics, the resource recovery rate only accounts for 36-40% of the 11 billion tons of recoverable reserves in the Ordos area, and about 6.6-7 billion tons of coal resources are discarded underground, resulting in sluggish coal volume, resulting in an extreme shortage of precious resources in the country. Big waste. On the other hand, with the high-intensity mining of coal resources, many mines are faci...

AI Technical Summary

Problems solved by technology

[0003] At present, a number of recovery methods for coal pillars left by room mining have been formed at home and abroad, but they have the disadvantages of low recovery rate and degree of mechanization. In addition, after the recovery of coal pillars, the supporting area of ​​the roof will be reduced, and the coal The stress concentration factor of the column will increase, which may cause the instability of the coal column, the collapse of the roof in a large area, and even endanger the safety of personnel.

Images