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 coalcaving 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 solve the serious imbalance of mining and caving ratios existing in ultra-thick coal seam mining , working face gas exceeding the limit, working face pressure frame and other technical problems, to further improve the technical level of fully mechanized caving mining in this type of coal seam in my country