Building method of filled wall body for gob-side entry retaining of large-inclination coal seam

Abstract

The invention relates to a building method of a filled wall body for gob-side entry retaining of a large-inclination coal seam, which comprises the following steps: erecting dense individual props on the entry retaining side on the rear part of a heading stope to retain roadway space on the rear part of the heading stope, erecting anti-tilting side supports along the dense individual props, laying reinforcing fabric and high-strength fiber cloth on the side of the dense individual props close to the gob, and building a structure used for intercepting waste rocks in the gob; and when the dropped waste rocks in the gob automatically slide along the large-inclination footwall to the waste rock blocking structure formed by the reinforcing fabric and the high-strength fiber cloth under the effect of the dead weight and pile up to a certain degree, grouting and cementing part of the dropped waste rocks near the entry retaining side for consolidation, thereby forming the filled wall body, and repeating the steps in sequence along with the advancement of the heading stope until the whole filled wall body for gob-side entry retaining. The invention has the advantages of simple method and high working efficiency, the filled wall body built in the method is of high strength and is also economical and practical, and the method is suitable for the building of the filled wall body for gob-side entry retaining under the high-inclination condition.

Description

technical field [0001] The invention relates to a method for constructing a filling wall for gob-side entry retention, in particular to a method for constructing a filling wall for gob-side entry retention in a coal seam with a large dip angle under the condition that the inclination angle of the coal seam is α>20°. Background technique [0002] Gobside entry retention refers to a preparation method for the mining roadway that will be reserved for the roadway serving the current working face after the coal mining face has been mined to serve the next working face. As a relatively advanced coal mining method, it can not only rationally develop coal resources, improve the force of roadway surrounding rock, reduce the amount of roadway excavation, but also help mine safety production and improve mine economic and technical effects. [0003] The current technology of gob-side entry retention in high-inclination coal seams mainly uses filling brackets or other types of formwor...

AI Technical Summary

Problems solved by technology

[0003] The current technology of gob-side entry retention in high-inclination coal seams mainly uses filling brackets or other types of formwork to fill high-water quick-setting materials, which is not only complicated in process, but also requires a lot of manpower and material resources, high labor intensity, and slow construction speed; rigid formwork is not easy Changes with the fluctuation of the slope surface of the roof and floor, which may easily lead to poor airtightness and grout leakage during the pouring process; the strength of the filling material is low, and the strength after filling generally does not exceed 10MPa, and it is very easy to weather after being exposed, and the strength will change after weathering. very low

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