Gentle dip coal seam roadway design and adjacent layer and goaf gas extraction method

Abstract

The invention provides a gentle dip coal seam roadway design and adjacent layer and goaf gas extraction method. The method comprises the following steps that a gentle dip coal seam is designed; all coal faces are arranged from bottom to top in the direction of a mining area rail transportation rise, a rubber belt transportation rise and a return air rise (called as three mining area rises for short); the mining sequence is performed from bottom to top; two stoping faces are arranged on the same wing of the same mining area of the coal seam at the same time, wherein a coal face is arranged in the lower part position of the rise, a working face close to the upper part of the rise is a to-be-mined working face; a to-be-mined working face headentry is used as a coal face extraction roadway; and high-position drill holes, low-position drill holes and big-diameter drill holes are formed in the extraction roadway, wherein the high-position drill holes are used for draining goaf fissure zone gas, the low-position drill holes are used for draining caving zone gas, and the big-diameter drill holes are used for draining goaf gas. The retreating type coal mining is performed on the coal faces;and after the work on the coal faces is finished, an extraction roadway of the to-be-mined working face is renamed as a headentry of a next to-be-mined working face. When being used, the method has the advantages of high gas extraction rate, good drainage effect, safety, reliability and low cost.

Description

technical field [0001] The invention relates to the field of gas control in coal mine mining working faces, in particular to a mining working face design, a goaf drainage method, and an overlying coal and rock formation fissure drainage method. Background technique [0002] During the mining process, as the mining face advances and the area of ​​the goaf increases continuously, the original stress of the adjacent coal strata will be destroyed, and the overlying coal strata will appear "three zones", namely the collapse zone, the fissure zone and the curved zone. In the subsidence zone, the gas in the roof and floor coal strata is released to the space of the coal mining face. The gas disaster is an important factor restricting the safe production of the mine. It is the first of the five natural disasters in coal mines. At the same time, gas is also an important clean energy. It is very important to choose a reasonable gas extraction method. [0003] The main methods used at...

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Problems solved by technology

[0003] The main methods used at home and abroad for the gas drainage technology of adjacent layers are high-level drainage roadway, drilling field, horizontal drilling, outburst coal seam protection layer mining, and ground drilling gas drainage methods. The above methods have poor drainage effects, complicated processes, A series of problems such as long period and high cost, aiming at the current method of gas drainage in the adjacent layer, in order to reduce the cost and improve the extraction effect, after 5 years of back mining 6 coal mining faces, a total of more than 5 million tons of coal were extracted, and the research was successful. A New Approach to Layer Drainage

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