Mining method for long wall working face of ultra thick seam

Abstract

The invention provides a mining method for a long wall working face of an ultra thick seam, and belongs to the technical field of coal resource mining. The method comprises the steps that firstly, the ultra thick seam is divided into a top layer, a middle layer and a bottom layer; then mining is carried out on the top layer by adopting a comprehensive mechanized coal mining method, and a top screen monitoring system, a displacement monitoring system and a pressure monitoring system are arranged on a goaf bottom plate of the top layer synchronously in a paved mode; after the mining carried out on the top layer is finished, the migration condition of a top plate of the ultra thick seam is analyzed, the mining is carried out on the bottom layer, and finally the mining is carried out on each layer from bottom to top gradually until complete mining is carried out on the ultra thick seam. According to the method, a laneway arrangement system is simple, the refuse rate of raw coal is low, the economic benefit is obvious, and it is achieved that safe, efficient and reliable mining can be carried out on the ultra thick seam with the thickness which reaches above 20 m.

Description

technical field [0001] The invention relates to the technical field of coal resource mining, in particular to a mining method for a long-wall working face of a huge thick coal seam. Background technique [0002] With the depletion of coal resources in eastern mining areas and the intensification of conflicts between resource and environmental constraints in central China, the focus of my country's coal resource development has rapidly shifted to the western region. Xinjiang is extremely rich in coal resources, and it is a very important energy base replacement area and strategic energy reserve area in the 21st century. One of the main characteristics of coal resources in Xinjiang is that thick coal seams are widely distributed and there are many extremely thick coal seams, such as Yili, Tuha, Kubai and other coal fields with estimated resources of more than 10 billion tons. Huge thick coal seam, the largest integrated coal field in China and even in the world—the Zhundong C...

AI Technical Summary

Problems solved by technology

Layer-laying and down-caving mining is to divide the thick coal seam into several layers parallel to the coal seam. When the thick coal seam is mined below, the problem of roof support and goaf treatment, the pressure of each layer below the roof layer appears to be eased, due to the artificial laying of false roofs, this method is safer, the recovery rate is high, and the technical and economic indicators are better; However, in the mining process, there are disadvantages such as complex roadway system layout, difficult roadway maintenance, and complicated production organization and management. Gently and moderately inclined thick coal seams

Layered constant bottom upward mining is to divide the thick coal seam into several layers equivalent to medium-thick coal seams, and the working faces of each layer are arranged along the coal seam floor in sequence. After the mining of the first layered working face, the overlying coal seam collapses and sinks. After water injection and compaction, re-cementation becomes a recycled coal body with certain stability and strength, and then the second and third layered working faces are re-arranged in the recycled coal body along the coal seam floor. This thick coal seam mining method roadway The system is simple, the process is simple, the impact of rock formation activities on the working face is small, it is beneficial to eliminate the threat of flooding and roof fall, and the technical and economic benefits are remarkable. Also increased the amount of coal washing, resulting in a significant increase in production costs

[0004] After years of research and practice, so far, it can be said that the development of coal resources in my country has formed a thick coal seam mining technology system with Chinese characteristics, but most of the research results are mainly concentrated on coal seams with a thickness of less than 20m. There is no safe, reliable and efficient mining method for the above-mentioned extremely thick coal seams. Therefore, there is an urgent need for a roadway layout system that is simple, reduces the raw coal content, improves economic benefits, and can ensure a thickness of more than 20m. Mining methods for safe and efficient mining of coal seams

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