A method for closing a mine section

Abstract

The application discloses a mine middle section closing method, comprising the following steps: S1, calculating the circumference C, section area S and section air volume Q of each air inlet roadway of the middle section to be closed; S2, using the circumference C, section area S, section average air speed v and section air volume Q of each air inlet roadway of the middle section to be closed to perform ventilation network calculation on the ventilation model of the middle section to be closed to obtain the air leakage point of the middle section to be closed; and S3, performing filling treatment on the roadway with the air leakage point. Compared with the prior art, the application can improve the air leakage and air running conditions of the closed middle section, effectively improves the mine ventilation effect, and thus reduces the energy consumption of the mine ventilation system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine exploration, in particular to a method for closing a middle section of a mine. BACKGROUND

[0002] In the process of mining, when the ore body of a middle section has been fully explored and mined out, it is generally considered that the middle section has no further exploration value, and the middle section needs to be closed.

[0003] Currently, the closing measure for the middle section of the mine is only to stop mining. However, as the middle section increases during the mining process, the effective air volume rate of the mine ventilation system will become lower and lower, and if the closed middle section is not further processed, it will lead to poor mine ventilation effect, serious air leakage, and even no air in the deep middle section stope. SUMMARY

[0004] The present application provides a method for closing a middle section of a mine to solve the problem that the existing method for closing a middle section of a mine leads to poor mine ventilation effect, serious air leakage, and even no air in the deep middle section stope.

[0005] To achieve the above-mentioned purpose, the embodiments of the present application adopt the following technical solutions.

[0006] A method for closing a middle section of a mine is provided, comprising the following steps:

[0007] S1, the circumference C, the cross-sectional area S and the cross-sectional air volume Q of each air inlet roadway of the middle section to be closed are calculated according to the following formula respectively:

[0008] C 1 / 4三心拱 = 2.2213 x B + (H - B / 4) x 2;

[0009] C 1 / 3三心拱 = 2.3266 x B + (H - B / 3) x 2;

[0010] S 1 / 4三心拱 = B x (H - B / 4 + 0.1982 x B);

[0011] S 1 / 3三心拱 = B x (H - B / 3 + 0.2627 x B);

[0012] Q = (S - S0) x v;

[0013] wherein B is the roadway width, H is the roadway height, S0 is the body area of the measurer, and v is the average wind speed of the cross section;

[0014] S2, the ventilation network of the ventilation model of the middle section to be closed is solved by using the circumference C, the cross-sectional area S, the average wind speed v and the cross-sectional air volume Q of each air inlet roadway of the middle section to be closed, to obtain the air leakage point of the middle section to be closed.

[0015] S3, filling the roadway with the air leakage point.

[0016] By the above method, the air leakage and air running of the closed middle section can be improved, the mine ventilation effect can be effectively improved, and thus the energy consumption of the mine ventilation system is reduced.

[0017] In some embodiments, between S2 and S3, the following step is further included: carrying out masonry filling retaining wall treatment on the slope, chute, cable hole, measure well and filling drill hole in the middle section to be closed. Thus, the filling slurry can be prevented from infiltrating into other middle sections.

[0018] In some embodiments, after S3, the following step is further included: S4, calculating the effective air volume increase rate P of the middle section after being closed according to the following formula:

[0019] P = (P1-P0) / P0 x 100%;

[0020] P0 = Q / Q 回 x 100%;

[0021] P1 = (Q+Q0-Q1) / Q 回 x 100%;

[0022] In the formula, P is the effective air volume increase rate after the middle section is closed, P0 is the effective air volume rate before the middle section is closed, P1 is the effective air volume rate after the middle section is closed, Q is the known air volume of the mine before the middle section is closed, Q 回 is the known return air volume of the mine before the middle section is closed; Q0 is the total air leakage amount before the middle section is closed, i.e. the sum of the air volumes of each air leakage point before the middle section is closed; Q1 is the total air leakage amount after the middle section is closed, i.e. the sum of the air volumes of each air leakage point after the middle section is closed.

[0023] Thus, the power of the mine ventilation system can be adjusted according to the effective air volume increase rate after the middle section is closed, and energy waste is avoided.

[0024] Compared with the prior art, the present application has at least the following technical effects or advantages: the air leakage and air running of the closed middle section can be improved, the mine ventilation effect can be effectively improved, and thus the energy consumption of the mine ventilation system is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a structural schematic diagram of a middle section to be closed before being closed according to an embodiment of the present application;

[0026] Figure 2 FIG. 2 is a structural schematic diagram of the middle section to be closed after being closed according to an embodiment of the present application.

[0027] In the figure: 1, auxiliary shaft; 2, ramp ground exit; 3, ramp connecting passage to +50m middle section; 4, power transformation chamber; 5, ramp connecting passage to 0m middle section; 6, air wall; 7, fault; 8, surface air shaft; 9, water drainage hole; 10, air door; 11, chute; 12, measure well (raise); 13, roof fall; 14, stope; 15, filling borehole; 16, cable hole; 17, -50m middle section ramp; 18, 0m section ramp; 19, air window; 20, east air return shaft; 25, filling retaining wall; 26, filling body. DETAILED DESCRIPTION

[0028] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings of the specification and specific embodiments.

[0029] Embodiment one

[0030] Reference Figure 1 A mine middle section closing method, comprising the following steps:

[0031] S1, the circumference C, sectional area S and sectional air volume Q of each air inlet roadway of the middle section to be closed are calculated according to the following formula respectively:

[0032] C 1 / 4三心拱 = 2.2213 x B + (H - B / 4) x 2;

[0033] C 1 / 3三心拱 = 2.3266 x B + (H - B / 3) x 2;

[0034] S 1 / 4三心拱 = B x (H - B / 4 + 0.1982 x B);

[0035] S 1 / 3三心拱 = B x (H - B / 3 + 0.2627 x B);

[0036] Q = (S - S0) x v;

[0037] In the formula, B is the roadway width, H is the roadway height, S0 is the body sectional area of the surveyor, and v is the average sectional wind speed;

[0038] If the exploration work of the two wings and the lower disc of the middle section has been completed, the resource quantity of the middle section has been exhausted or has no mining value, the middle section can be determined as the middle section to be closed. After determining the middle section to be closed, the geological data of the middle section after mining is collected completely, including the positions of the explored and drawn stope, measure well, cable hole, filling borehole, ramp, air return passage and other engineering that can be used in later production. The structure schematic diagram of the middle section to be closed before closing is shown in Figure 1 .

[0039] S21, using the perimeter C, the cross-sectional area S, the cross-sectional average wind speed v and the cross-sectional air quantity Q of each air inlet roadway in the to-be-closed section to perform ventilation network calculation on the ventilation model of the to-be-closed section, to obtain the air leakage point of the to-be-closed section;

[0040] The perimeter C and the cross-sectional area S of each air inlet roadway can be measured and calculated by using the multi-point method (Ning Yawen. Derivation and application of simple calculation formula for cross section of arched roadway [C] / / 2012 National Coal Mine Safety Academic Conference Proceedings, 2012: 172-174.).

[0041] The cross-sectional average wind speed v can be measured by using the ventilation resistance detector and the sideways line method (Wang Hanqing, Ventilation Engineering [2nd Edition], [M]. Mechanical Engineering Press, 2019). Specifically, the measurement personnel stand with their backs against the roadway wall, hold the ventilation resistance detector with their arms straight in the vertical direction of the air flow, and move in a zigzag line. The ventilation resistance detector is about 0.6m-0.8m away from the human body, and the ventilation resistance detector must be perpendicular to the air flow direction and move uniformly when moving on the cross section. The number of times of measuring the same cross-sectional wind speed should not be less than three, and the error of each measurement should be within ±5%.

[0042] The ventilation model of the to-be-closed section can be modeled according to the position arrangement of the section roadway shaft engineering, air inlet, slope, chute, measure well and air return channel in the to-be-closed section. The modeling and ventilation network calculation software can use Ventsim.

[0043] S22, the slope, chute, cable hole, measure well and filling drill hole in the to-be-closed section are treated by masonry filling retaining wall. The thickness of the filling retaining wall can be determined by stability analysis using Flac3D software to ensure that the filling retaining wall has good stability and prevents the filling retaining wall from collapsing due to slurry leakage, ensuring the safety of the slope, chute, cable hole, measure well and filling drill hole.

[0044] S3, the roadway with air leakage point is treated by filling.

[0045] The specific steps of the filling treatment include:

[0046] 1) Drill a drainage hole on the filling retaining wall;

[0047] 2) Use the existing filling system (filling drill hole) in the mine to connect the filling pipe from the filling drill hole position to the to-be-closed area, and then fill the to-be-closed area;

[0048] 3) The filtered water in the filling slurry flows out to the section ditch through the drainage hole of the filling retaining wall, and the section gushing water is discharged to the surface through the water pump house or self-flow.

[0049] The filling material is mainly 1:15 lime-sand ratio filling slurry (water + cement or glue solid material + full tailings or classified tailings) with 70% concentration. The structure diagram after the middle section is closed is shown in Figure 2 .

[0050] S4, the effective air volume rate P after the middle section is closed is calculated according to the following formula:

[0051] P=(P1-P0) / P0x100%;

[0052] P0=Q / Q 回 x100%;

[0053] P1=(Q+Q0-Q1) / Q 回 x100%;

[0054] In the formula, P is the effective air volume rate after the middle section is closed, P0 is the effective air volume rate before the middle section is closed, P1 is the effective air volume rate after the middle section is closed, Q is the known air volume of the mine before the middle section is closed, Q 回 is the known return air volume of the mine before the middle section is closed; Q0 is the total air leakage before the middle section is closed, that is, the sum of the air volumes of each air leakage point before the middle section is closed; Q1 is the total air leakage after the middle section is closed, that is, the sum of the air volumes of each air leakage point after the middle section is closed. After the middle section is closed, the displacement monitoring system can also be used to monitor the stability after the middle section is closed.

[0055] The power of the mine ventilation system can be adjusted according to the effective air volume rate after the middle section is closed to avoid energy waste. Taking a lead-zinc mine as an example, the total return air volume of the whole mine is 630.55m 3 / s, the measured effective air volume of the system is 419m 3 / s, before the 80m middle section area is closed, the effective air volume rate of the measured system of the mine is 419÷630.55=66.45%. After the middle section is closed, the air intake of the middle section area is 4.72m3 / s, and the reduced air intake enters the deep middle section stope air demand point. Since the total air volume of the mine system has not changed, the effective air volume rate of the system after the middle section is closed increases by 4.72m 3 / s, the effective air volume rate of the system after the middle section is closed is (419+4.72)÷630.55=67.20%, so the effective air volume rate improvement rate after the middle section is closed is (67.20%-66.45%) / 66.45%=1.13%. The effective air volume rate of the mine is increased by 1.13%, and according to the above formula, the effective air volume of the deep mining working face of the mine is increased by 4.72m 3 / s, that is, the mine at least reduces 1 working face of 5.5Kw+11Kw local fan (two working at the same time can increase 5m 3According to the mine working system, 330 days x 3 shifts x 8 hours, the annual working time of the local fan is considered as 330 x 3 x 6 hours, and the mine can save 98010 degrees of electricity per year.

[0056] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for closing a mine section, comprising the steps of: S1, calculating the perimeter C, the sectional area S and the sectional air volume Q of each air inlet roadway of the section to be closed according to the following formulae respectively: C 1 / 4三心拱 = 2.2213 x B + (H - B / 4) x 2; C 1 / 3三心拱 = 2.3266 x B + (H - B / 3) x 2; S 1 / 4三心拱 = B x (H - B / 4 + 0.1982 x B); S 1 / 3三心拱 = B x (H - B / 3 + 0.2627 x B); Q = (S-S0) x v; wherein B is the roadway width, H is the roadway height, S0 is the measured body sectional area, and v is the sectional average air speed; S2, performing ventilation network calculation on the ventilation model of the section to be closed by using the perimeter C, the sectional area S, the sectional average air speed v and the sectional air volume Q of each air inlet roadway of the section to be closed, to obtain the air leakage points of the section to be closed; S3, performing filling treatment on the roadway with the air leakage points; S4, calculating the effective air volume increase rate P of the section to be closed after being closed according to the following formula: P = (P1-P0) / P0 x 100%; P0 = Q / Q 回 x 100%; P1 = (Q + Q0 - Q1) / Q 回 x 100%; In the formula, P is the effective air volume increase rate after the middle section is closed, P0 is the effective air volume rate before the middle section is closed, P1 is the effective air volume rate after the middle section is closed, Q is the known air volume of the mine before the middle section is closed, Q 回 is the known return air volume of the mine before the middle section is closed; Q0 is the total air leakage before the middle section is closed, that is, the sum of the air volumes of various air leakage points before the middle section is closed; Q1 is the total air leakage after the middle section is closed, that is, the sum of the air volumes of various air leakage points after the middle section is closed; S5, adjusting the power of the mine ventilation system according to the effective air volume increase rate of the section after being closed, to avoid energy waste.

2. The mine mid-section closure method of claim 1, characterized in that The steps between S2 and S3 further comprise the step of performing masonry filling retaining wall treatment on the slope, the chute, the cable hole, the measure well and the filling drill hole in the section to be closed.

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