Fully-mechanized caving mining process technology with large mining height in super-high seam (14-20m)

Abstract

The invention provides a coal mining method of fully-mechanized caving mining with large mining height in a super-high seam, a coal caving process, reasonable type of a support, production capacity of equipment, comprehensive control measures of coal wall spalling of working face, a technical route for improving the recovery rate of the fully-mechanized caving face with the large mining height, and feasibility evaluation indexes (thickness of the seam, top coal cavability, coal wall stability and roof pressure strength) of the fully-mechanized caving mining with the large mining height, and further forms a whole set of fully-mechanized caving mining process technology with the large mining height. The coal mining method is that the coal cutting height is 4.2-4.8m; the length of the working face is 200-280m; and the web of a coal mining machine is 0.8-1m. The process technology can increase the coal cutting quantity by 43%, shorten the coal caving time by 9%, relatively reduce the coal caving quantity by 9%, improve the resource recovery rate by 5% and reduce the mining-caving ratio to below 1:3 by increasing the coal cutting height, and can further realize the relatively balanced production of mining and caving of the working face.

Description

technical field [0001] The invention belongs to coal mining technology. Background technique [0002] The recoverable reserves of thick coal seams in my country account for about 43% of the country's recoverable reserves, and the coal output of thick coal seams mined underground accounts for about 40% to 50% of the country's coal production every year. The development of my country's coal industry has an important impact. Since the 1980s, my country has conducted a large number of experimental studies on mechanized coal mining methods for thick coal seams, and gradually formed a Chinese thick coal seam mining technology system. mining. [0003] 1. Layer-by-layer fully mechanized mining is to divide the thick coal seam into several medium-thickness (2.0-3.0m) layers, and carry out longwall fully mechanized mining on each layer in turn. Layered mining is a mature technology, but the production process is complicated, the roadway excavation has a large amount of engineering, a...

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Problems solved by technology

[0007] The purpose of this invention is to learn from the characteristics of the large mining height fully mechanized mining technology and fully mechanized caving mining technology, and propose a coal mining method for large mining height fully mechanized caving mining in extra-thick coal seams, so as to