Yolk coal rock formation downward hole pumping and mining pressure relief mash gas construction method

A construction method and soft coal technology, applied in gas discharge, earthwork drilling, mining equipment, etc., can solve problems such as wind flow gas exceeding the limit, and achieve the effects of ensuring safe mining, increasing construction speed, and high hole formation rate

Active Publication Date: 2008-10-01
HUAINAN MINING IND GRP
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Problems solved by technology

[0004] In order to avoid the shortcomings of the above-mentioned prior art, the present invention provides a construction method for extracting pressure-relieving gas from downward boreholes in soft coal rock strata, so as to solve the problem of excessive gas flow in the return air lane of the coal mining face, and realize...

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  • Yolk coal rock formation downward hole pumping and mining pressure relief mash gas construction method
  • Yolk coal rock formation downward hole pumping and mining pressure relief mash gas construction method
  • Yolk coal rock formation downward hole pumping and mining pressure relief mash gas construction method

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Embodiment Construction

[0027] Referring to Figure 1, after the working face is put into production, the air tunnel will be filled with filling material to retain the tunnel for the second time during the mining period, as the return air tunnel of the face, and the air intake from the two lanes in the mining direction of the working face will be used to realize "two inlets and one air inlet". "Y" type ventilation

[0028] The main composition of the filling material in the roadway section is concrete paste, and the filling width x height is 3.0m x 1.8m. From the top to the bottom, the German BSM1002E new filling pump is used for filling. At the same time, for post-mining deformed roadways, supplementary shed support and undercover methods are adopted to ensure the section of the roadway retained along the gob.

[0029] As shown in Fig. 1 and Fig. 2, gob-side retaining 1 is the roadway reserved along the goaf during the working mining process; the drilling construction angle of the downward-penetratio...

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Abstract

The invention relates to a method for drainaging pressure relief gas construction by a downward borehole in soft coal seam and strata, characterized in that a downward cross-seam borehole is arranged on the roadway segment retained for next sublevel on the mining face of a protecting layer, and the lower covered protecting coal seam is gas pre-drainaged through the downward cross-seam borehole. The construction of the downward cross-seam borehole comprises the following steps: a borehole enlarging segment is formed downwards from the bottom plate of the coal seam of the roadway segment retained for next sublevel, the borehole protection is finished in the inner sleeve in the middle lower part of the borehole enlarging segment, slurry is injected between the outer wall of the inner sleeve and a rock to from a borehole sealing segment, and the further construction of the downward cross-seam borehole is carried out in the inner sleeve. According to the invention, the pressure relief gas of the protecting layer namely the lower covered coal seam is maximally drainaged when the protecting layer is mined, the mining effect of the protecting layer is improved, and the safe stoping of the mining face is ensured.

Description

technical field [0001] The invention relates to a construction method for gas drainage and pressure relief in the mining process of coal seam groups, more specifically to a construction method for gas drainage and pressure relief in the mining process of low air permeability, high gas, outburst and soft coal seams. Background technique [0002] The control of gas disasters is a major problem in the process of coal mining. Most of the mines mining coal seam groups at home and abroad adopt mining protective layers. When exploiting the protective layer, it is necessary to carry out gas pre-extraction on the protected layer. The gas pre-extraction is mainly to drill through the layer, and for the lower protective layer without or without the construction floor roadway, it is necessary to construct the drilled hole through the layer. Pre-draw. Otherwise, on the one hand, the protected layer will not be fully relieved after the protective layer is mined; Ventilation will still c...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 袁亮方良才郑群张士环周汝洪苏利军李勇
Owner HUAINAN MINING IND GRP
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