Coal and gas coordination mining method

Abstract

A coal and gas coordination mining method relates to the coal mine mining and gas extraction field; a plurality of parallel bedding pores are arranged in the present section and the lower adjacent section along the coal seam direction in a haulage way, and are connected with extraction pipelines so as to extract gas from the coal seam area in the upper and lower sections; the method also comprises the following steps: tunneling back to a tailgate of the present section when the gas extraction is over, and tunneling to the haulage way of the lower section in the same time; finishing the present working face extraction when the tunneling is completed; repeating said steps until extractions of all section coal seams are finished. The advantages are that the coal and gas coordination mining method can save gas total extraction time, can accelerate coal road tunneling speed, thus realizing extraction, tunneling and drawing balance, and improving production efficiency.

Description

technical field [0001] The invention relates to the fields of coal mining and gas drainage. In particular, it is a coal and gas coordinated mining method suitable for unprotected layer mining. Background technique [0002] In recent years, with the increase of mining depth, the gas pressure of coal seams has gradually increased, the gas content has gradually increased, and the ground stress has also increased at the same time, and the danger of coal and gas outburst has become increasingly serious. Coal mine gas control must be based on the principle of regional outburst prevention measures first, that is, mining protective layers and pre-pumping coal seam gas. However, for coal seams without protective seams, only the measures of pre-exhausting coal seam gas can be taken. [0003] For outburst coal seams with low air permeability and no protective layer, surface well drainage and through-bed drilling should be one of the preferred methods, but the amount of engineering is...

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Problems solved by technology

However, for coal seams without protective seams, only the measures of pre-exhausting coal seam gas can be taken

[0003] For outburst coal seams with low air permeability and no protective layer, surface well drainage and through-bed drilling should be one of the preferred methods, but the amount of engineering is large, the cost is high, and the construction time is long. It is not easy to choose the rock layer of the through-bed drilling, and sometimes it is necessary to use the bedding drilling for supplementary drainage after the bedding drainage; in the tunneling of the outburst coal seam, the method of pre-extracting coal seam gas along the bedding strips , although it is also an effective method, it seriously affects the tunneling speed

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