阅读说明：本技术 利用采空区闭墙抽采数据测定采空区瓦斯浓度场的方法 (Method for measuring gas concentration field of goaf by utilizing goaf closed wall extraction data ) 是由 文光才 邹云龙 赵旭生 孙东玲 隆清明 张庆华 蒲阳 车禹恒 刘延保 邓敢博 牟 于 2020-10-29 设计创作，主要内容包括：本发明公开了一种利用采空区闭墙抽采数据测定采空区瓦斯浓度场的方法,包括步骤：S1.采集工作面采空区闭墙的瓦斯抽采浓度；S2.采集工作面的下隅角瓦斯浓度；S3.判断第i个闭墙的瓦斯抽采浓度是否小于第i-1个闭墙的瓦斯抽采浓度,若是,则进入步骤S4；若否,则结束；S4.判断第i个闭墙的瓦斯抽采浓度是否趋近于零或第i个闭墙的瓦斯抽采浓度是否小于所述工作面的下隅角瓦斯浓度,若是,则确定瓦斯浓度场,若否,则结束。本发明的利用采空区闭墙抽采数据测定采空区瓦斯浓度场的方法,能够有效地测定采空区瓦斯浓度场,计算精确、过程简易,提高了采空区瓦斯灾害的分析效率,保障了煤矿的安全生产。(The invention discloses a method for measuring a gas concentration field of a goaf by utilizing goaf closed wall extraction data, which comprises the following steps: s1, collecting the gas extraction concentration of a closed wall of a working face goaf; s2, collecting the gas concentration of the lower corner of the working face; s3, judging whether the gas extraction concentration of the ith closed wall is smaller than that of the (i-1) th closed wall, and if so, entering the step S4; if not, ending; and S4, judging whether the gas extraction concentration of the ith closed wall approaches to zero or not or whether the gas extraction concentration of the ith closed wall is smaller than the gas concentration of the lower corner of the working face or not, if so, determining a gas concentration field, and if not, ending. The method for measuring the gas concentration field of the goaf by using the closed-wall extraction data of the goaf can effectively measure the gas concentration field of the goaf, has accurate calculation and simple process, improves the analysis efficiency of gas disasters of the goaf, and ensures the safety production of a coal mine.)

1. A method for measuring a gas concentration field of a goaf by utilizing goaf closed-wall extraction data is characterized by comprising the following steps: the method comprises the following steps:

s1, collecting the gas extraction concentration of the closed wall of the working face goaf to obtain a gas extraction concentration sequence (X)₁,X₂,…,X_i,…,X_n) (ii) a Wherein, X_iThe gas extraction concentration corresponding to the ith closed wall; n is the total number of the closed walls of the goaf on the working face; i is a serial number for sequencing the closed walls of the working face goaf in the reverse direction of the return air direction, and i is 1,2, …, n;

s2, collecting the gas concentration x of the lower corner of the working face₂；

S3, judging the gas extraction concentration X of the ith closed wall_iWhether the gas extraction concentration is less than the gas extraction concentration X of the (i-1) th closed wall_i-1If yes, go to step S4; if not, ending;

s4, judging the gas extraction concentration X of the ith closed wall_iWhether the gas extraction concentration X approaches zero or the ith closed wall_iWhether or not less than lower corner gas concentration x of the working face₂If so, taking the intersection point of the symmetrical middle line of the ith closed wall and the (i-1) th closed wall and the upper edge of the working face as the first endpoint position, taking the position of the lower corner of the working face as the second endpoint position, and taking a curve l formed by connecting the first endpoint position and the second endpoint position_iThe concentration contour lines of the extraction affected area between the ith closure wall and the (i-1) th closure wall are taken as concentration contour lines, and different concentration contour lines are concentration fields of the gas in the goaf; if not, the process is ended.

2. The method for determining the gas concentration field of the goaf by using the goaf close-wall extraction data as claimed in claim 1, wherein: step S1 further includes: gas extraction concentration X corresponding to the ith closed wall_iThe concentration of the concentration contour line of the extraction influence position of the ith closed wall is taken as the concentration of the concentration contour line of the extraction influence position of the ith closed wall; and the concentration contour line of the extraction influence position of the ith closed wall is a connecting curve of the position of the ith closed wall and the position of the lower corner of the working face.

3. The method for determining the gas concentration field of the goaf by using the goaf close-wall extraction data as claimed in claim 1, wherein: step S2 further includes: collecting gas concentration x at upper corner of working face₁And the gas concentration x at the upper corner is measured₁The concentration of the concentration contour line of the extraction influence position as the upper corner; and the concentration contour line of the extraction influence position of the upper corner is a connecting curve of the position of the upper corner and the position of the lower corner of the working surface.

4. The method for determining the gas concentration field of the goaf by using the goaf close-wall extraction data as claimed in claim 1, wherein: in step S4, the concentration of the deviation position in the extraction influence region between the ith bulkhead and the (i-1) th bulkhead is determined by an interpolation method.

Technical Field

The invention relates to the field of gas, in particular to a method for measuring a gas concentration field of a goaf by utilizing goaf closed wall extraction data.

Background

The gas control in the goaf is a difficult problem of gas control in a coal mine, and most of the goaf belongs to a compacted space, so that the gas in the goaf cannot be effectively monitored, and great gas hazards in the goaf, such as gas explosion in the goaf, re-mining gas hazards in the goaf and the like, are possibly caused.

In order to safely extract the gas in the goaf, a reliable support can be provided for the safe extraction of the gas in the goaf by a mode of measuring a gas concentration field in the goaf. At present, the existing method for the gas concentration field of the goaf has large deviation of a calculation result or complex operation process.

Disclosure of Invention

In view of the above, the invention aims to overcome the defects in the prior art, and provides a method for determining a gas concentration field of a goaf by using goaf closed-wall extraction data, which can effectively determine the gas concentration field of the goaf, is accurate in calculation and simple in process, improves the analysis efficiency of gas disasters of the goaf, and ensures the safe production of a coal mine.

The method for measuring the gas concentration field of the goaf by utilizing the goaf closed-wall extraction data comprises the following steps:

s1, collecting the gas extraction concentration of the closed wall of the working face goaf to obtain a gas extraction concentration sequence (X)₁,X₂,…,X_i,…,X_n) (ii) a Wherein, X_iThe gas extraction concentration corresponding to the ith closed wall; n is the total number of the closed walls of the goaf on the working face; i is the reverse of the closed wall of the working face gob in the air return directionOrdinal numbers for direction ordering, i ═ 1,2, …, n;

s2, collecting the gas concentration x of the lower corner of the working face₂；

S3, judging the gas extraction concentration X of the ith closed wall_iWhether the gas extraction concentration is less than the gas extraction concentration X of the (i-1) th closed wall_i-1If yes, go to step S4; if not, ending;

s4, judging the gas extraction concentration X of the ith closed wall_iWhether the gas extraction concentration X approaches zero or the ith closed wall_iWhether or not less than lower corner gas concentration x of the working face₂If so, taking the intersection point of the symmetrical middle line of the ith closed wall and the (i-1) th closed wall and the upper edge of the working face as the first endpoint position, taking the position of the lower corner of the working face as the second endpoint position, and taking a curve l formed by connecting the first endpoint position and the second endpoint position_iThe concentration contour lines of the extraction affected area between the ith closure wall and the (i-1) th closure wall are taken as concentration contour lines, and different concentration contour lines are concentration fields of the gas in the goaf; if not, the process is ended.

Further, step S1 further includes: gas extraction concentration X corresponding to the ith closed wall_iThe concentration of the concentration contour line of the extraction influence position of the ith closed wall is taken as the concentration of the concentration contour line of the extraction influence position of the ith closed wall; and the concentration contour line of the extraction influence position of the ith closed wall is a connecting curve of the position of the ith closed wall and the position of the lower corner of the working face.

Further, step S2 further includes: collecting gas concentration x at upper corner of working face₁And the gas concentration x at the upper corner is measured₁The concentration of the concentration contour line of the extraction influence position as the upper corner; and the concentration contour line of the extraction influence position of the upper corner is a connecting curve of the position of the upper corner and the position of the lower corner of the working surface.

Further, in step S4, the concentration of the deviation position in the extraction influence region between the ith bulkhead and the (i-1) th bulkhead is determined by an interpolation method.

The invention has the beneficial effects that: according to the method for determining the gas concentration field of the goaf by using the closed-wall gas extraction data of the goaf, disclosed by the invention, the concentration of the gas in the goaf is determined by adopting a closed-wall gas extraction mode, so that the gas distribution of the goaf can be effectively analyzed, the gas concentration field of the goaf is calculated, the analysis efficiency of gas disasters of the goaf is improved, and the safe production of a coal mine is ensured.

Drawings

The invention is further described below with reference to the following figures and examples:

FIG. 1 is a schematic flow chart of the method of the present invention.

Detailed Description

The invention is further described with reference to the accompanying drawings, in which:

the method for measuring the gas concentration field of the goaf by utilizing the goaf closed-wall extraction data, disclosed by the invention, comprises the following steps as shown in figure 1:

s1, collecting the gas extraction concentration of the closed wall of the working face goaf to obtain a gas extraction concentration sequence (X)₁,X₂,…,X_i,…,X_n) (ii) a Wherein, X_iThe gas extraction concentration corresponding to the ith closed wall; n is the total number of the closed walls of the goaf on the working face; i is a serial number for sequencing the closed walls of the working face goaf in the reverse direction of the return air direction, and i is 1,2, …, n; in this embodiment, the working surface includes an air intake lane and an air return lane; the gas in the goaf flows out to a return airway along a buried pipe arranged at the edge of the goaf under the action of wind power, and the closed wall is arranged at a gas outlet of the buried pipe;

s2, collecting the gas concentration x of the lower corner of the working face₂(ii) a The lower corner of the working face is an included angle between the working face air inlet lane and the working face;

s3, judging the gas extraction concentration X of the ith closed wall_iWhether the gas extraction concentration is less than the gas extraction concentration X of the (i-1) th closed wall_i-1If yes, go to step S4; if not, ending;

s4, judging the gas extraction concentration X of the ith closed wall_iWhether the gas extraction concentration X approaches zero or the ith closed wall_iWhether or not less than lower corner gas concentration x of the working face₂If yes, the ith closing wall is connected withThe intersection point of the symmetrical middle line of the (i-1) th closed wall and the upper edge of the working face is taken as a first endpoint position, the position of the lower corner of the working face is taken as a second endpoint position, and a curve l formed by connecting the first endpoint position and the second endpoint position_iThe concentration contour lines of the extraction affected area between the ith closure wall and the (i-1) th closure wall are taken as concentration contour lines, and different concentration contour lines are concentration fields of the gas in the goaf; if not, the process is ended.

It should be noted that the gas extraction concentration or the gas concentration can be measured by using an extraction measuring instrument, and the extraction measuring instrument adopts the prior art, and is not described herein again. The concentration contour line in the invention is a curve formed by connecting a plurality of points with the same or similar gas concentrations.

According to the requirements of coal mine safety production, the wind direction and the wind power in the working face goaf are generally stable, and the concentration contour line is generally a curve protruding outwards under the action of the wind power, namely, the connecting curve in the invention is a curve protruding outwards.

In this embodiment, step S1 further includes: gas extraction concentration X corresponding to the ith closed wall_iThe concentration of the concentration contour line of the extraction influence position of the ith closed wall is taken as the concentration of the concentration contour line of the extraction influence position of the ith closed wall; and the concentration contour line of the extraction influence position of the ith closed wall is a connecting curve of the position of the ith closed wall and the position of the lower corner of the working face.

In this embodiment, step S2 further includes: collecting gas concentration x at upper corner of working face₁And the gas concentration x at the upper corner is measured₁The concentration of the concentration contour line of the extraction influence position as the upper corner; and the concentration contour line of the extraction influence position of the upper corner is a connecting curve of the position of the upper corner and the position of the lower corner of the working surface. And the upper corner of the working face is an included angle between the working face air return roadway and the working face.

In this embodiment, in step S4, the concentration of the deviation position in the extraction influence region between the ith closed wall and the (i-1) th closed wall is determined by an interpolation method. The interpolation method adopts the prior art and is not described in detail herein.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.