SU1550136A1 - Method of determining the width of reference pressure zone - Google Patents

Abstract

The invention relates to mining. The goal is to increase the safety of work on outburst formations. From the advanced clearing face of the preparatory mine 1, the wells (C) 2 pass parallel to the clearing face 3 in a plane parallel to the coal seam. The wells 2 are located in the host rocks in the roof or soil of the formation. As the bottom 3 approaches C 2, the substances released in C 2 are continuously monitored. The distances from the bottom 3 to C 2 are measured at the time of the occurrence of methane in them, the release of water, and the increase in methane pressure relative to atmospheric pressure. The width of the reference pressure zone is determined by the difference between the first and third measurements, and the position of the maximum of this zone is determined by the second measurement. 2 Il.

Description

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iff and d. 2

The invention relates to mining and is intended to control the stress-strain state of an array in coal mines,

The purpose of the invention is to improve the safety of work on outburst formations.

FIG. 1 shows a scheme for implementing the method; in fig. 2 is a layout of wells.

The scheme contains the advance processing 1, wells 2, the working face 3, the mine pressure plot 4.

The method is carried out as follows.

Out of advance advancement of the preparatory development 1, boreholes 2 pass in the bedding plane. The boreholes 2 are located parallel to the clearing face 3. The distance from the clearing bottom to the wells in the bedding plane is chosen so that initially the wells 2 are located outside the zone of influence of the clearing face 3. For better preservation of the wells 2, they are held in the surrounding soil at a distance of m, where m is the reservoir output. As the clearing hole 3 approaches the wells 2, the substances released from the well are continuously monitored. When methane appears in the well, a distance of 11 between it and the cleaning face 3, corresponding to the far boundary of the reference pressure zone, is measured. A further approach of the bottom 3 to the well 2 is accompanied by the release of water into it. In this moment

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determine distance 1

ten

15

20

25

thirty

35

40

Ј equal to the distance to the maximum of the reference pressure zone. At the moment of increase in methane pressure relative to atmospheric gas, accompanied by gas outflow from the well, the distance 1- is measured, corresponding to the near boundary of the reference pressure zone. From the difference 1 (-13, the width of this zone is determined.

The method makes it possible to increase the safety of work on outburst formations by measuring outside the coal seam.

Claims (1)

Invention Formula A method for determining the width of the reference pressure zone, which includes conducting wells in the bedding plane from the advanced mining downhole, monitoring substances released from the wells, and determining the distance from the wells being monitored to the refining face as it approaches, and the wells are located parallel to the bottomhole outside its zone influence, characterized in that, in order to increase the accuracy of the determination, the wells are conducted in the host rocks and measure the distance from the refining development to the well in s of occurrence therein of methane, separating water and pressurizing the methane relative to atmospheric, the difference of the first and third measurements determined width of the reference pressure zone and the second measurement - the maximum position of this zone. , tfZ) figure 1