Large mining height gob-side entry retaining roadside filling structure and filling body construction method

Abstract

The invention discloses a large-mining-height gob-side entry retaining roadside filling structure and a filling body construction method. According to the structure, two rows of single hydraulic props are arranged on the outer side of a to-be-filled area in a supported mode; the multiple reinforcing meshes are arranged around a to-be-filled area in a surrounding mode; the top and the bottom of the filling bag abut against the top plate and the bottom plate respectively, an anti-shear supporting mechanism is arranged in the filling bag, and the part outside the anti-shear supporting mechanism is filled with a high-water-content quick-setting material. The anti-shearing supporting mechanism is composed of a steel pipe, a round hole sleeve and an opposite-pulling anchor rod, and the steel pipe is filled with gangue concrete; a plurality of round hole sleeves are fixedly connected to pipe bodies on the two sides of the steel pipe; the opposite-pulling anchor rods are correspondingly inserted into the circular hole sleeves and connected with the ladder beams, the trays and the nuts on the outer side of the reinforcing mesh. The method comprises the steps of arranging single hydraulic props and reinforcing meshes; filling bags and steel pipes are placed; the opposite-pulling anchor rods are inserted; filling gangue concrete; injecting a high-water quick-setting material; and a filling wall is formed. According to the structure and the method, the supporting effect is ideal, and the bearing strength and the deformation resistance of the filling body can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of surrounding rock control of gob-side roadways in coal mines, and in particular relates to a filling structure next to gob-side roadway retention with large mining height and a filling body construction method. Background technique [0002] The technology of gob-side entry retention has been developed for a long time in the field of coal mining. Through the method of gob-side entry retention, coal pillar-free mining is realized, which is conducive to a more reasonable development of coal resources; the realization of gob-side entry retention is also The essence of continuous development is to adopt a certain form of roadside support behind the mining face, such as using wooden piles, concrete pillars, masonry gangue belts, concrete filling walls, etc., to effectively maintain the roadway, so as to be able to Better serve the next section. [0003] With the development of roadside support technology, the f...

AI Technical Summary

Problems solved by technology

For the filling wall, during the advancement of the mining face, it will bear the self-weight load of the broken direct roof and the old roof, and at the same time bear the pressure of the old roof; as the mining face continues to advance, the old roof will break , forming a hinged rock beam structure, the filling wall needs to bear the pressure transmission during the rotation process of the hinged rock beam roof, under the vertical pressure, the filling wall will undergo obvious deformation, and may even cause excessive deformation and lead to the failure of the roadway retention

[0004] For the traditional roadside support methods such as wood pile support, dense pillar support and gangue belt support, the main disadvantages are slow resistance increase speed, low support capacity, poor sealing performance, high wood consumption and low degree of mechanization; for The support method of concrete blocks has low efficiency, and the speed of roadway retention cannot keep up with the progress of mechanized rapid coal cutting. At the same time, it requires a large amount of labor load; materials, etc.) technology has the advantages of fast resistance increase speed, large bearing capacity, good sealing performance and high degree of mechanization, and has become the main way of roadside support for gob-side retaining at this stage

However, the roadside supports constructed with these filling materials usually have low bearing strength and weak deformation resistance. At the same time, they cannot achieve effective roof connection, which reduces the support effect.

In addition, with the increase of mining depth, the roadside support constructed by these filling materials will become wider and wider, resulting in a large amount of filling materials, high cost of long-distance auxiliary transportation, and difficulty in controlling deformation of surrounding rock. unavoidable salient issues

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