Construction method of gob-side entry retaining wall of solid filling coal mining

Abstract

The invention discloses a construction method of a gob-site entry retaining wall of solid filling coal mining. The retaining wall is composed of a gangue-piled wall and a compact cementing filling body. The construction method comprises the following steps: cleaning float coal close to an end head after mining and removing frame at a working face; arranging a row of single supporting columns at inner side of a roadway, close to a gob; arranging a wooden backboard at the gob side, close to the single supporting columns; connecting the backboard with the top and bottom; fixing the backboard to the single supporting columns through iron wires; piling the gangue wall at the gob side, close to the backboard; filling the gangue and cement mixing filling material into the gob at the back of two brackets of the gangue-piled wall after the gangue wall is piled; compacting through a rammer compactor to form the compact cementing filling body. With the adoption of the method, the recovery ratio of coal resources can be raised; in addition, the operation at the filling working surface is simple and convenient to carry out, and is also safe and reliable, and high practicability is also brought.

Description

technical field [0001] The invention relates to a construction method for supporting a wall in gob-side entry retention in solid-fill coal mining, and is especially suitable for gob-side entry retention without coal pillars in solid-fill coal mining working faces. Background technique [0002] In recent years, the solid filling coal mining technology has gradually matured, and has been widely used in my country's "three down" coal mining, and has achieved remarkable economic, social and environmental benefits. The filling rate of the goaf can reach more than 85%. Since the goaf is filled with solid filling materials, the degree of movement and deformation of the overlying strata is significantly reduced, and there is basically no mine pressure. Usually, a coal pillar of about 20m is left between the two working faces in the upper and lower sections of the filling coal mining, resulting in a large loss of coal resources. In order to further improve the recovery rate, most mi...

AI Technical Summary

Problems solved by technology

Normally, a coal pillar of about 20m is left between the two working faces in the upper and lower sections of the backfill coal mining, resulting in a large loss of coal resources

In order to further improve the recovery rate, most mines have adopted the gob-side entry technology, but the gob-side entry method is based on the caving mining method, the construction is difficult, the cost is high, and the construction technology and the filling of the working face Interaction, inefficiency

Images