A method of layered mining of extremely thick coal seams

Abstract

The invention discloses a layered mining method of an ultra-thick coal seam and belongs to the field of safe and efficient mining of the ultra-thick coal seam. The layered mining method includes the steps of layering, layered mining, coal chute digging and reservation layer releasing. In the layering step, the thickness of every layer is required to meet the caving mining thickness in an existingmining technology condition, and the reservation layer above the layers is required to fill a goaf after falling and bulking; in the process of layered mining, the fell reservation layer is not recovered temporarily and is enabled to fill the goaf; coal chutes are dug behind a bottom layer working face by a certain distance and are dug in a coal layer bottom plate, lower portions of the coal chutes are connected with coal conveying roadways, and the quantity of the coal chutes meets the requirement on coal discharging in the later period; the reservation layer releasing is performed after bottom layer working face advance till the ultra-thick coal seam is mined completely. The layered mining method has the advantages that overlying strata is less disturbed, coal conveying roadways are avoided from being damaged and influenced by upper layer mining, safe and efficient mining of the ultra-thick coal seam can be realized, and high practicability and generalization performance are achieved.

Description

technical field [0001] The invention relates to the field of safe and efficient mining of extremely thick coal seams, in particular to a layered mining method of extremely thick coal seams. Background technique [0002] my country is rich in coal resources, and the thickness of the coal seam is large, especially in the coalfields in the northwest region, where there are many extremely thick coal seams, and there are even extremely thick coal seams with a single layer thickness of more than 200m. In recent years, with the large-scale mining of coal resources in the east, resource reserves have gradually decreased, and the country's large coal bases are shifting to the west. [0003] At present, the research on mining technology of thin, medium-thick and thick coal seams is developing rapidly. For the mining of thick coal seams, mining methods such as fully-mechanized top-coal caving mining, large mining height and single mining full-thickness mining, layered mining, and filli...

AI Technical Summary

Problems solved by technology

The roadway layout of the layered mining method is complex and difficult to maintain

The filling mining method has strong applicability and can effectively control the roof, but the filling process is complicated and costly

[0004] At present, the relatively mature thick coal seam mining technology in my country mainly mines coal seams with a thickness of no more than 20m. For the extremely thick coal seams in the western region, there is currently no safe and feasible mining method

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