Longitudinal Longwall Planing and Milling Trough Mining Method in Steeply Inclined Coal Seam

Abstract

The invention relates to a planing and grooving type mining method for a longitudinal long-wall of a steeply pitching seam, belonging to the technical field of steeply pitching seam mining. The invention aims to provide a steeply pitching seam mining method capable of reducing the labor intensity of the worker, improving the underground operating environment and improving the coal recovery rate. According to the technical scheme, the method comprises the following steps: S1, arranging mining lanes on the upper and lower portions of the seam separately; S2, constructing a plurality of mine slide holes at certain intervals and arranging a coal conveying system in the lower mining lane; S3, mining the upper mining lane by using mining machinery and mining coal, except coal out of a coal pillar, between the upper and lower mining lanes; S4, performing goaf filling; and S5, repeating the S1 to S4 so as to realize safe and efficient mining of the steeply pitching seam, low-cost backfilling of coal gangue, effective protection of the ecological environment and sustainable development and utilization of resources. The method provided by the invention is particular suitable for mining the steeply pitching seam the thickness of which is 2-20m.

Description

technical field [0001] The invention relates to a longitudinal longwall planing, milling and slotting type mining method for steeply inclined coal seams, which belongs to the technical field of steeply inclined coal seam mining, and in particular relates to an underground mining method for steeply inclined coal seams with a thickness of 2-20m. Background technique [0002] With the increase of mining intensity of coal resources, the mining conditions of coal seams are becoming more and more complex, and all provinces in our country are facing the problem of mining steeply inclined coal seams. There are more than 100 mines in steeply inclined coal seams in my country, mainly distributed in more than 20 mining areas such as Urumqi, Yaojie, Beijing, Huainan, Kailuan, Xuzhou, Changguang, Nantong, Zixing, and Datong. In terms of mining methods for steeply inclined coal seams, three main types have been formed, namely blast mining technology, fully mechanized mining technology and...

AI Technical Summary

Problems solved by technology

The fully mechanized mining technology is strictly restricted by the thickness and inclination of the coal seam. It mainly solves the mining problem of steeply inclined and extra-thick coal seams with an inclination greater than 60°, a thickness greater than 20m, and stable occurrence. The blast mining technology and water mining technology can be applied to thickness 2~ 20m steeply inclined coal seam mining, but blast mining technology adopts the method of blasting coal, which has major problems such as low coal recovery rate, high labor intensity of workers, and harsh underground working environment; water mining technology uses high-pressure water jets up to 20 MPa Drifting coal and using pipelines to transport some coal by hydraulic power, the production system loses a lot of energy during the high-pressure water circulation process, and there are major problems such as large water consumption, large power consumption, and high production costs.

On the other hand, in terms of the surrounding rock control of the working face, because the upper surrounding rock in the goaf collapses and then rolls (slides) along the inclined direction to fill the lower goaf during the mining of steeply inclined coal seams, the stability of the upper part of the surrounding rock in the stope is the highest. Poor, followed by the middle, and the best in the lower part. The appearance characteristics of rock pressure in the working face are asymmetrical along the direction of coal seam inclination. It is difficult to control the surrounding rock of the working face, which affects the production safety of the working face.

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