阅读说明：本技术 一种井下多中段采矿作业通风优化方法 (Ventilation optimization method for underground multi-middle-section mining operation ) 是由 于常先 刘再涛 侯成录 冯安安 吕英磊 赵洪凯 郭勋英 栾东朋 陈晓东 徐华鹏 于 2021-07-01 设计创作，主要内容包括：本发明公开了一种井下多中段采矿作业通风优化方法。首先在作业区域的中(分)段巷两翼系统回风井处安装调节风门,在采场回风天井上部风联内施工风墙,根据采场回采进度,控制中(分)段巷可调节风门的关闭及风墙的拆除,确保污风与上中段新鲜风流不发生污风串联,用以改善通风质量。本发明方法能够有效减少多中段作业区域污风串联、优化作业区域通风环境。(The invention discloses a ventilation optimization method for underground multi-middle-section mining operation. Firstly, installing an air damper at the return air shaft of a middle (sub) section roadway two-wing system in an operation area, constructing an air wall in an air connection at the upper part of a stope return air raise, and controlling the closing of the adjustable air damper and the dismantling of the air wall of the middle (sub) section roadway according to the stope recovery progress so as to ensure that dirty air and fresh air flow of the upper middle section do not generate dirty air series connection and improve the ventilation quality. The method can effectively reduce the series connection of the dirty wind in the multi-middle-section operation area and optimize the ventilation environment of the operation area.)

1. A ventilation optimization method for underground multi-middle-section mining operation is characterized by comprising the following steps:

the first step is as follows: in the multi-middle-section continuous mining operation, a middle-section transportation roadway (2) and an upper subsection roadway (10) are preferentially constructed, the formed middle-section transportation roadway (2) and the formed upper subsection roadway (10) are respectively communicated with a system return air shaft (7), and a regulating damper (6) is arranged near the system return air shaft (7);

the second step is that: dividing a stope, constructing a stope connecting channel (3) and a return air raise (5) respectively, constructing a return air raise upper connecting channel (11) communicated with the return air raise (5) from an upper middle section transportation lane (13), and constructing an air wall (12) in the return air raise upper connecting channel (11);

the third step: when stope ore bodies corresponding to the middle section transportation lane (2) and the lower section lane (9) are stoped, the air wall (12) constructed in the upper connection lane (11) of the return air patio is always closed; a damper (6) between the middle section haulage roadway (2) and the system return air shaft (7) is partially opened to allow a small amount of air leakage; the damper (6) between the upper section roadway (10) and the system return air shaft (7) is opened; constructing and installing a drainage well (4) in the layered extraction process;

when stope ore bodies corresponding to the upper subsection roadway (10) are stoped, the air wall (12) is dismantled, and the air damper (6) between the middle section transportation roadway (2) and the system return air shaft (7) and the air damper (6) between the upper subsection roadway (10) and the system return air shaft (7) are partially opened to allow a small amount of air leakage; and opening (fully opening) a damper (6) between the upper and middle section transportation lanes (13) and the system return air shaft (7).

2. The method of optimizing ventilation in a downhole multi-mid section mining operation of claim 1, wherein: when stope ore bodies corresponding to the middle-section transportation lane (2) are stoped, stope fresh air flow (1) sequentially flows through the middle-section transportation lane (2), a stope connecting channel (3) and a drainage well (4) at the lower part, a stope working face, a return air raise (5), a stope connecting channel (3) at the upper part, an upper part subsection lane (10) and a system return air well (7); when stope ore bodies corresponding to the lower subsection lane (9) are stoped, stope fresh air flow (1) sequentially flows through the lower subsection lane (9) and the middle section transportation lane (2), a stope connecting channel (3) and a drainage well (4) at the lower part, a stope working face, a return air raise (5), a stope connecting channel (3) at the upper part, an upper subsection lane (10) and a system return air well (7); when stope ore bodies corresponding to the upper subsection lane (10) are stoped, stope fresh air flow (1) sequentially flows through the upper subsection lane (10) and the middle section transportation lane (2), the stope connecting channel (3) and the water drainage well (4) on the upper portion, a stope working face, a return air raise (5), a return air raise upper portion connecting channel (11), an upper middle section transportation lane (13) and a system return air well (7).

3. The method of optimizing ventilation in a downhole multi-mid section mining operation of claim 1 or 2, wherein: the position of the drainage well (4) is close to the lower wall of the stope in the stope and is communicated with the bottom plate of the current mining face.

Technical Field

The invention belongs to the technical field of mining, and relates to a mining operation ventilation optimization method. The method is mainly suitable for ventilation optimization of multi-middle-section continuous mining of the underground mine.

Background

In underground mining, multiple-mid-section continuous mining is often employed to improve productivity. When mining in multiple middle sections, because there is no special return airway, the dirty wind is often caused to be connected in series, which affects the ventilation quality and produces great harm to the operators. In order to improve the ventilation quality of multi-middle-section continuous stoping, the ventilation mode of multi-middle-section mining operation needs to be optimized.

Disclosure of Invention

The invention aims to solve the technical problem of providing a ventilation optimization method for underground multi-middle-section mining operation, which is used for controlling dirty air and fresh air flow of an upper middle section not to generate dirty air series connection so as to improve the ventilation quality of a mining operation environment.

The technical scheme of the invention is as follows:

a ventilation optimization method for underground multi-middle-section mining operation is characterized by comprising the following steps:

the first step is as follows: in the multi-middle-section continuous mining operation, a middle-section transportation roadway and an upper subsection roadway are preferentially constructed and formed, the formed middle-section transportation roadway and the formed upper subsection roadway are respectively communicated with a system return air shaft, and a regulating damper is arranged near the system return air shaft;

the second step is that: dividing a stope, constructing a stope connecting channel and a return air raise respectively, constructing the upper connecting channel of the return air raise from an upper middle section transportation lane to be communicated with the return air raise, and constructing an air wall in the upper connecting channel of the return air raise;

the third step: when stoping the stope ore bodies corresponding to the middle section transportation lane and the lower section lane, the air wall constructed in the upper connecting lane of the return air raise is always closed; a damper between the middle section transportation lane and the system return air shaft is partially opened to allow a small amount of air leakage; the damper between the upper section roadway and the return air shaft of the system is opened; constructing and installing a drainage well in the layered extraction process;

when stope ore bodies corresponding to the upper section lane are stoped, the air wall is dismantled, and the air doors between the middle section transportation lane and the system return air shaft and the air doors between the upper section lane and the system return air shaft are both partially opened to allow a small amount of air leakage; and opening (fully opening) a damper between the upper and middle section transportation lanes and the return air shaft of the system.

When stope ore bodies corresponding to the middle-section transportation lane are stoped, stope fresh air flows sequentially flow through the middle-section transportation lane, the lower stope connecting channel, the drain well, the stope working face, the return air raise, the upper stope connecting channel, the upper subsection lane and the system return air well; when stope ore bodies corresponding to the lower subsection lane are stoped, stope fresh air flows sequentially flow through the lower subsection lane and the middle section transportation lane, the stope connecting channel and the drainage well at the lower part, the stope working face, the return air raise, the stope connecting channel at the upper part, the upper subsection lane and the system return air well; when stope ore bodies corresponding to the upper subsection lane are stoped, stope fresh air flows sequentially flow through the upper subsection lane and the middle section transportation lane, the stope connecting channel and the drainage well on the upper portion, the stope working face, the return air raise upper connecting channel, the upper middle section transportation lane and the system return air well.

The position of the drainage well is close to the lower wall of the stope in the stope and is communicated with the bottom plate of the current mining face.

The invention has the positive effects that:

the first, upper and lower two middle sections form independent ventilation system respectively, have improved the ventilation quality.

Temporarily using the upper subsection tunnel as a special ventilation tunnel, and enabling foul air generated in the middle-section mining operation to enter the upper subsection tunnel; the wind wall is constructed in the wind connection at the upper part of the stope return air raise, and the passage of dirty wind entering the upper middle section is cut off, so that the independent ventilation system of the middle section and the upper middle section is formed, and the ventilation quality is improved.

Secondly, according to the extraction progress, the upper and lower two middle sections form a unified ventilation system, and the ventilation quality is further improved.

When the whole stoping of the upper section ore body is finished, when the middle section is stoped to the upper section roadway, the air wall constructed in the wind connection at the upper part of the stope return air raise is removed, and the dirty wind generated in the middle section mining operation enters the upper section transportation roadway through the return air raise and then enters the system return air well.

Thirdly, the operation efficiency is high, and the occupational hazards of operators are effectively reduced.

In multi-middle-section mining operation, due to the fact that the method avoids series connection of dirty air, ventilation quality is good, operation efficiency can be effectively improved, and occupational hazards of operators are greatly reduced.

Drawings

Fig. 1 is a longitudinal projection view after construction according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view taken along line B-B of fig. 1.

Fig. 3 is a cross-sectional view taken along line C-C of fig. 1.

Fig. 4 is a cross-sectional view taken along line D-D of fig. 1.

In the figure: 1-fresh air flow; 2-middle section transportation lane; 3-stope junction road; 4, a drainage well; 5-return air raise; 6-damper adjustment; 7, a system return air shaft; 8-dirty wind current; 9-lower section lane; 10-upper section lane; 11-upper connecting channel of return air raise; 12-wind wall; 13-upper middle section transportation lane.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

An embodiment of the invention comprises the following steps:

the first step is as follows: in the multi-middle-section continuous mining operation, the middle-section transportation lane 2 and the upper subsection lane 10 are preferentially constructed, the formed middle-section transportation lane 2 and the formed upper subsection lane 10 are respectively communicated with the system return air shaft 7, and the damper 6 is installed near the system return air shaft 7, as shown in fig. 2, 3 and 4. The function of the damper 6 is to control the fresh air flow 1 or the dirty air flow 8 to enter the return air shaft of the system, so as to control the air quantity.

The second step is that: dividing the stope according to the occurrence condition of the middle-section ore body, constructing a stope connecting channel 3 and a return air raise 5, constructing a return air raise upper connecting channel 11 communicated with the return air raise 5 from an upper middle-section transportation lane 13, and constructing an air wall 12 in the return air raise upper connecting channel 11, referring to fig. 1 and 2. When the stope ore body corresponding to the upper and middle section transportation lanes 13 is not completely stoped, the air wall 12 is used for preventing the dirty air 8 from returning to the upper and middle section transportation lanes 13 and preventing the fresh air flow 1 and the dirty air flow 8 from being connected in series.

The third step: when stope ore bodies corresponding to the middle section transportation lane 2 and the lower section transportation lane 9 are stoped, the air wall 12 constructed in the upper connection lane 11 of the return air raise is always sealed. A damper 6 between the middle-section transportation lane 2 and the system return air shaft 7 is partially opened to allow a small amount of air leakage, so that fresh air flow 1 is ensured in the middle-section transportation lane 2, and the purposes of ensuring the ventilation safety of inspectors and facilitating subsequent engineering construction are achieved; the damper 6 between the upper section lane 10 and the system return shaft 7 is open (fully open). And a drainage well 4 is constructed and installed in the layered extraction process. The position of the drainage well 4 is close to the lower wall of the stope in the stope and is communicated with the bottom plate of the current stope face.

When stope ore bodies corresponding to the middle section transportation lane 2 are stoped, stope ventilation lines are as follows: fresh air flow 1-middle section transportation lane 2-stope connecting channel 3 and drainage well 4-stope working face-return air raise 5-stope connecting channel 3 on the upper portion-upper section lane 10-system return air well 7. See fig. 1, 2, 3, 4.

When stope ore bodies corresponding to the lower subsection lane 9 are stoped, stope ventilation lines are as follows: fresh airflow 1-lower section lane 9 and middle section transportation lane 2-lower stope connecting lane 3 and sluice well 4-stope working face-return air raise 5-upper stope connecting lane 3-upper section lane 10-system return air well 7. See fig. 1, 2, 3, 4.

When stope ore bodies corresponding to the upper section lane 10 are mined, the air wall 12 is dismantled, and the air damper 6 between the middle section transportation lane 2 and the system air return shaft 7 and the air damper 6 between the upper section lane 10 and the system air return shaft 7 are partially opened to allow a small amount of air leakage, so that the ventilation safety of inspectors is ensured. And opening (fully opening) the damper 6 between the upper and middle section transportation lanes 13 and the system return air shaft 7.

When stope ore bodies corresponding to the upper subsection roadway 10 are stoped, stope ventilation lines are as follows: fresh airflow 1-upper section lane 10 and middle section transport lane 2-upper stope connecting lane 3 and sluice well 4-stope working face-return air raise 5-return air raise upper connecting lane 11-upper middle section transport lane 13-system return air well 7.

The invention improves the ventilation environment and avoids the series connection of the dirty wind and the wind flow by optimizing the ventilation mode for the underground multi-middle-section continuous mining.

The series connection of the invention refers to: the fresh air flow and the dirty air flow are mixed.