Technique of coal mining and gas extraction withou

Authors: Liang Yuan

Publish Date: 2009/04/26

Volume: 15, Issue: 2, Pages: 120-128

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Abstract

Aimed at the low mining efficiency in deep multiseams because of high crustal stress high gas content low permeability the compound “three soft” roof and the troublesome safety situation encountered in deep level coal exploitation proposed a new idea of gobside retaining without a coalpillar and Ystyle ventilation in the firstmined key pressurerelieved coal seam and a new method of coal mining and gas extraction The following were discovered the dynamic evolution law of the crannies in the roof is influenced by mining the formative rule of “the vertical crannyabundant area” along the gobside the distribution of air pressure field in the gob and the flowing rule of pressurerelieved gas in a Ystyle ventilation system The study also established a theoretic basis for a new mining method of coal mining and gas extraction which is used to extract the pressurerelieved gas by roadway retaining boreholes instead of roadway boreholes Studied and resolved many difficult key problems such as fast roadway retaining at the gobside without a coalpillar Ystyle ventilation and extraction of pressurerelieved gas by roadway retaining boreholes and so on The study innovated and integrated a whole set of technical systems for coal and pressure relief gas extraction The method of the pressurerelieved gas extraction by roadway retaining had been successfully applied in 6 typical working faces in the Huainan and Huaibei mining areas The research can provide a scientific and reliable technical support and a demonstration for coal mining and gas extraction in gaseous deep multiseams with low permeability

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