Gob-side entry retaining flexible infilled wall body structure and filling method thereof

Abstract

The invention discloses a gob-side entry retaining flexible infilled wall body structure which comprises an infilled wall body, as well as bagged gangue and threaded anchor rods. The laying height of the bagged gangue is the height of a roadway, the threaded anchor rods are in contact with the bagged gangue close to one side of a transportation roadway and is vertically buried in a roadway baseplate, and the exposed part is in the length of 800-1200 mm; the adjacent two threaded anchor rods are 450 mm away from each other; on the transportation roadway side 500-750 mm away from the bagged gangue, an infilled wall body template is erected. As a paste material is wholly filled outside the gangue bags, the flexible infilling body is reinforced into an inclosed solid and deformed with the internal bagged gangue collaboratively, and accordingly, communication between a goaf and harmful gases in the roadway is prevented.

Description

technical field [0001] The invention relates to a gob-side entry retaining flexible filling wall structure and a filling method thereof. The flexible filling wall structure is especially suitable for gob-side entry retaining in medium-thick coal seams under a hard roof. Background technique [0002] After the coal mining face has been mined, the roadway in the section (or lower section) on the original working face is reserved and used when the adjacent working face is mined. The remaining roadway is called gob-side entry retention. After the working face of the upper section of the mining area is mined, the roadway left along the goaf can be used as a return airway when the working face of the lower section is mined. [0003] In the past, there were mainly two modes of entry retention on hard roofs: the first mode used filling rigid materials (σ c ≥4MPa), the roadway is mainly "supported", and its disadvantage is that the rigid material cannot adapt to the dynamic load cau...

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Problems solved by technology

[0003] In the past, there were mainly two modes of entry retention on hard roofs: the first mode used filling rigid materials (σ c ≥4MPa), the roadway is mainly "supported", and its disadvantage is that the rigid material cannot adapt to the dynamic load caused by the movement of the roof, so that the support body is easily fractured, causing gas leakage or even ignition, or roadway instability leads to roadway retention Failed; the second mode of filling flexible materials (generally filling crushed gangue) is mainly "protection", and its disadvantage is that the stress-strain relationship of the gangue bearing pressure and the coordination relationship between the filling body and the movement of the overburden rock have not been grasped. Quantitative support design cannot be carried out, which may easily cause large deformation of the surrounding rock and excessive roof sinking, resulting in roof fall in the roadway. In order to effectively avoid the above problems, the method of blasting and breaking the roof was usually used in the past, but the process is complicated and the construction is difficult. Large, which limits the popularization and application of gob-side entry retention

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