Gob-side-entry-retaining flexible roadside support and rigid entry-in support combined supporting method

Abstract

The invention relates to a gob-side-entry-retaining supporting method, in particular to a gob-side-entry-retaining flexible roadside support and rigid entry-in support combined supporting method. The method comprises the steps that a row of point-anchor rope reinforced roadway top plates are arranged in a roadway in the tunneling period, a row of point-anchor rope reinforced roadway ribs are arranged in the side roadway rib of the non-working surface, and a row of constant-resistance anchor rope beam reinforced roadway top plates are arranged on the position a certain distance away from the side roadway rib of the working surface; and according to the data changing situation of the mine pressure in a retained roadway in the period of backstopping of the working surface and the showing situation of the roadway mine pressure, an entry-in supporting area in the retained roadway is divided into an advance supporting area, a lagging supporting area, a roadway-forming to-be-stable area and a roadway-forming stable area. According to the gob-side-entry-retaining flexible roadside support and rigid entry-in support combined supporting method, through the successful practice of cross heading under the 21702 working surface, an excessive coal safety pillar with the width of 5 m is recycled compared with tunneling of an original gob-side entry driving, the coal resource recovery rate is improved, a solid foundation is laid for popularization of the gob-side entry retaining technology in other mining-area working surfaces of the whole mine, and a brand-new thinking is provided for the excavation-replacement layout of the whole mine.

Description

technical field [0001] The invention relates to a support method for gob-side entry retaining, in particular to a design of a combined support structure of a gob-side entry retaining flexible support body and a rigid support body inside the entryway. Background technique [0002] Longwall mining generally needs to leave coal pillars, especially as the advancing length of the working face increases, the remaining coal pillars cause a large loss of resources. Therefore, many mining areas continue to implement gob-side entry retention technology to improve the resource recovery rate. Gobside retaining is a technology to maintain and retain the original mining roadway along the edge of the goaf behind the coal mining face. Due to its remarkable advantages, including the ability to increase the coal recovery rate, reduce the roadway excavation rate, and ease the tension of excavation replacement; it can realize coal and gas co-mining, etc., and meets the development requirements...

AI Technical Summary

Problems solved by technology

The successful implementation of joint support and roof cutting and pressure relief technology for gob-side entry retention on the 21701 working face has accumulated valuable experience for the gob-side entry retention work along the 21702 working face, but it is different from the 21701 working face. The most important thing is that the trough under the 21702 working face is a machine-rail roadway. Due to the limited space of the roadway, it brings difficulties to the roadway support during the roadway retention period. Therefore, it is necessary to choose a reasonable roadway support form to ensure the success of the roadway retention.

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