Gob-side entry retaining method using high-water material filling columns

Abstract

A gob-side entry retaining method using high-water material filling columns belongs to the field of mine supports. With advancing of actual mining working faces, filling column structures are produced near end hydraulic supports at designed intervals, and two to three single hydraulic supports are fixed on the periphery of each filling column structure to assist forming of filling columns; and evenly-mixed high-water material slurry is filled into constructed filling column structures, and the single hydraulic supports are removed 4 hours after the filled slurry solidifies to finish construction of the filling columns. Road-side supports are formed by the filling columns in a row, the roadway is retained, and gob-side entry retaining is achieved. By the method, a huge amount of filling materials is saved, downhole auxiliary transport amount is low, and cost is low. The constructed filling columns are simple in construction and high in bearing capacity. An operator can operate below a top plate supported by bolt-mesh-cable in the roadway without entering a gob, and accordingly safety and reliability are high.

Description

technical field [0001] The invention relates to the technical field of mine roadway support, in particular to the field of coal mine mechanized roadside filling and gob-side roadway retaining support. Background technique [0002] Gob-side entry retention technology is a major breakthrough in my country's coal mine safety mining technology. The traditional gob-side entry retention of high-water material entry is to build a continuous filling wall behind the working face along the edge of the goaf to preserve the entryway and realize gob entry retention. With this method, the constructed filling wall has a large bearing capacity and a good maintenance effect. However, during construction, personnel need to go to the unsupported area of ​​the side roof of the gob for construction, which is very dangerous. The filling wall body of construction uses many materials, and cost is high. [0003] On August 6, 2010, the China Invention Patent Bulletin announced the invention applic...

AI Technical Summary

Problems solved by technology

The disadvantage is: use a spraying machine to fill sand and stone into the steel cylinder formwork together, and then install a vibrating device on the steel cylinder formwork to compact the sand and stone. The top is difficult, and the initial support strength is low, and the quality of pier columns is affected by many factors during construction

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