Shallow coal seam narrow coal pillar gob-side entry protection method

Abstract

The invention relates to a shallow coal seam narrow coal pillar gob-side entry protection method which comprises the following steps: S1, extracting coal rock samples of a top plate and a bottom plate of a to-be-stoped working face to obtain physical and mechanical parameters of surrounding rock, and calculating the width of a narrow coal pillar according to a limit equilibrium theory; determining the bearing stress distribution of the to-be-stoped working face according to the physical and mechanical parameters of the surrounding rock and the width of the narrow coal pillar; s2, calculating the influence of different coal pillar widths on the stability of the surrounding rock according to the geological parameters and supporting stress distribution of the working face to be stoped, and determining the coal pillar width; and S3, stoping is conducted, the length, the distance, the pre-tightening force and the row pitch parameters of the anchor rods are calculated, and the roadway is supported according to the supporting parameters. According to the method, the basic parameters in the roadway are determined by combining data simulation, the width of the narrow coal pillar is determined, the reasonable supporting parameters are calculated for supporting, the supporting safety of the roadway is guaranteed when the narrow coal pillar is stoped, and meanwhile resource waste is reduced.

Description

technical field [0001] The invention relates to the technical field of mine roadway excavation, in particular to a gob-side roadway protection method for shallow buried coal seams and narrow coal pillars. Background technique [0002] As the country with the largest coal production and the largest consumption in the world, China has always been known as "rich in coal, poor in oil, and less in gas". It is undeniable that coal, as China's main energy and fuel, has an extremely high production structure. High, its basic status will not change in the short term. In our country, most coal mines are mined by underground mining, which requires a large number of excavation tunnels, of which more than 80% are mining tunnels. [0003] The existing mining roadway layout methods can be divided into three ways: wide coal pillar roadway protection, gob-side entry retention and gob-side excavation. low, the waste of coal resources is serious, and with the increase of the mining depth of t...

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Problems solved by technology

[0004] Therefore, the present invention provides a gob-side protection method for narrow coal pillars in shallow coal seams, which is used to overcome the problem of unreasonable size of narrow coal pillars in the prior art, which makes the roof prone to stress concentration

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