CN111608714A - Roof-cutting pressure-relief gob-side entry retaining ventilation mode optimization method - Google Patents
Roof-cutting pressure-relief gob-side entry retaining ventilation mode optimization method Download PDFInfo
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- CN111608714A CN111608714A CN202010471535.2A CN202010471535A CN111608714A CN 111608714 A CN111608714 A CN 111608714A CN 202010471535 A CN202010471535 A CN 202010471535A CN 111608714 A CN111608714 A CN 111608714A
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- ventilation
- side entry
- data column
- gob
- entry retaining
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/15—Correlation function computation including computation of convolution operations
Abstract
The invention belongs to the technical field of mine ventilation, and particularly relates to a top-cutting pressure-relief gob-side entry retaining ventilation mode optimization method. The method specifically comprises the following steps: s1; determining a comparison data column; determining the number n of ventilation schemes and the number m of influencing factors of a working face after gob-side entry retaining after roof cutting and pressure relief; preparing a comparison data column according to the value of the ith scheme at the Kth influencing factor; s2; determining a reference data column by adopting an expert analysis method; s3; and calculating the relevance number of the data columns of the influence factors of each scheme to the reference data column to obtain the relevance degree, wherein the preferred ventilation mode is the mode with the high relevance degree. The invention optimizes the ventilation system of the working face, so that the optimized ventilation system is adaptive to the production capacity, simultaneously matches the technical requirements of gas extraction and spontaneous combustion fire prevention, achieves the advanced, reasonable and reliable technical requirements, has stronger anti-disaster capability, and forms a ventilation system with sufficient air volume and stable air flow.
Description
Technical Field
The invention belongs to the technical field of mine ventilation, and particularly relates to a top-cutting pressure-relief gob-side entry retaining ventilation mode optimization method.
Background
Under the condition of roof cutting and roadway forming coal pillar-free mining technology, the ventilation mode of the working face can be generally Y-shaped ventilation and W-shaped ventilation. Because the main wall section of the entry retaining is the caving zone of the goaf, the goaf is completely exposed in the tunnel to form a completely open state, and compared with the situation of sealing and blocking the goaf in the traditional stoping process, the goaf cannot be completely closed. Different ventilation modes have important influence on air leakage, gas emission and natural ignition of the goaf. Therefore, the reasonable selection of the ventilation mode is crucial to safe production.
Disclosure of Invention
The invention provides a method for reasonably selecting a ventilation mode under complex underground environment and a plurality of influence factors, and the purpose that the preferred ventilation system is adaptive to the production capacity is achieved.
In order to achieve the aim, the invention provides a preferable method for a roof-cutting pressure-relief gob-side entry retaining ventilation mode, which comprises the following steps:
s1: determining a comparison data column; determining the number n of ventilation schemes and the number m of influencing factors of a working face after gob-side entry retaining after roof cutting and pressure relief; preparing a comparison data column according to the value of the ith scheme at the Kth influencing factor;
s2: determining a reference data column by adopting an expert analysis method;
s3: and calculating the relevance number of the data columns of the influence factors of each scheme to the reference data column to obtain the relevance degree, wherein the preferred ventilation mode is the mode with the high relevance degree.
Specifically, the value of the ith solution at the Kth influencing factor in step S1 constitutes the comparison data column { x }i(K)}＝{xi(1),xi(2),...,xi(m)}(i＝1,2,...,n)。
Specifically, the reference data column in step S2 is { x }0(K)}＝{x0(1),x0(2),...x0(m)}。
Specifically, the formula of the degree of association in step S3 is as follows:
the formula 1 is a correlation calculation formula, the formula 2 is a correlation calculation formula, and the optimal ventilation mode is the one with the highest correlation.
Compared with the prior art, the invention has the advantages that:
the invention provides a roof-cutting pressure-relief gob-side entry retaining ventilation mode optimization method, which optimizes a working face ventilation (roadway) system, so that the optimized ventilation system is adaptive to production capacity, matches the technical requirements of gas extraction (high-position drilling and pipe burying arrangement mode) and spontaneous combustion fire prevention and control, achieves the technical advantages of advancement, reasonability and reliability, has strong disaster resistance, and forms a ventilation system with sufficient air volume and stable air flow.
Drawings
FIG. 1 is a schematic view of a Y-shaped ventilation system in an embodiment of the present invention.
FIG. 2 is a schematic view of a W-shaped ventilation system in an embodiment of the present invention.
In fig. 1: 1-a first roadway, 2-a stope face, 3-a second roadway, 4-a gob-side entry, 5-a goaf and 6-a third roadway.
Detailed Description
The invention provides a preferable method for a roof cutting pressure relief gob-side entry retaining ventilation mode. Firstly, according to geological information parameters: and (3) making a detailed ventilation implementation scheme according to the coal seam thickness, the coal seam inclination angle alpha, the coal seam trend, the gas parameter, the hydrological condition and other parameters with requirements in construction. And (5) preparing before implementation, and considering the risk factors such as crack, fault, water and the like.
A preferable method for a roof cutting pressure relief gob-side entry retaining ventilation mode comprises the following steps:
the method comprises the following steps: determining a comparison data column; determining the number n of ventilation schemes for the working face after gob-side entry retaining after topping and pressure relief, influencing factorsThe number m; the comparison data column { x ] is prepared by the value of the ith scheme at the Kth influencing factori(K)}＝{xi(1),xi(2),...,xi(m) } (i ═ 1, 2.., n). Factors considered by the invention include preparation cost before mining, tunneling cost, roadway maintenance cost, outburst danger, coal bed explosion danger, spontaneous combustion danger, climate conditions and the like (specific influence factors are determined according to actual conditions). And for { xi(K) The numerical value of the method is evaluated by adopting an expert analysis method.
Step two: determining reference data sequence, setting the reference data sequence as { x0(K)}＝{x0(1),x0(2),...x0(m)}。
Step three: and calculating the relevance number of the influence factor data columns of each scheme to the reference data column to obtain the relevance, wherein the calculation formula of the relevance is as follows:
the formula 1 is a correlation number, the formula 2 is a correlation degree, and the preferred ventilation mode is that the final correlation degree is large.
The invention provides a preferable method for the roof cutting pressure relief gob-side entry retaining ventilation mode, and the ventilation mode of the working face behind the gob-side entry retaining after roof cutting pressure relief is comprehensively considered in combination with numerical simulation. After a model is established by using fluent numerical simulation software, three zones of gas source items and porosity (wherein the porosity is explained by using UDF), boundary conditions and the like are set to simulate the gas migration rule under different working face ventilation modes and finally obtain the change of the air leakage rate along with the air distribution rate. The preferred ventilation scheme is derived by combining the simulated air leakage with the air leakage monitored on site using the trace gas SF 6.
Calculating the optimal ventilation mode according to the relevance degree, comparing the optimal ventilation mode with the optimal ventilation mode obtained through numerical simulation, and if the optimal ventilation mode is consistent, obtaining the optimal ventilation mode scheme of the roof-cutting pressure-relief gob-side entry retaining stope working face finally; and if the preferred ventilation modes are not consistent, calculating by using the correlation degree to finally obtain a preferred ventilation mode scheme of the roof cutting pressure relief gob-side entry retaining stope working face.
An implementation case;
fig. 1 and 2 are schematic diagrams of roof cutting, pressure relief and gob-side entry retaining of a certain mine; the stoping face 2 is pushed along the trend, and the side wall of a gob-side entry retaining 4 formed after roof cutting and pressure relief is filled with a plugging air material in the top rock layer of the gob 5 along the trend of the face; when a Y-shaped ventilation system is adopted, the secondary air inlet roadway is a first roadway 1, a second roadway 3 and the return air roadway is a third roadway 6; when the W-shaped ventilation system is adopted, the air inlet roadway is a first roadway 1 and a third roadway 6, and the air return roadway is a second roadway 3. FIG. 1 is a schematic view of a Y-type ventilation system;
figure 2 is a schematic view of a W-shaped ventilation system.
The influencing factors considered are: the reference number series of preparation cost before mining, tunneling cost, roadway maintenance cost, outburst risk, coal bed explosion risk, spontaneous combustion risk and climate condition is {0.8, 0.75, 0.90, 0.50, 0.60, 1.00, 1.00}
Absolute difference | x0(k)-xi(k) The calculation results of |, the correlation coefficient and the correlation degree are respectively listed in the following table:
table 1; each scheme satisfies good frequency at different influence factors
Table 2; | x0(k)-xi(k) Calculation result of |
Table 3; correlation coefficient calculation result
Table 4; calculation result of degree of association
| Scheme(s) | W | Y |
| Degree of association | 0.531 | 0.589 |
The finally determined 110-method ventilation mode is determined according to the degree of correlation, namely Y is the preferred ventilation mode.
Claims (4)
1. A roof cutting pressure relief gob-side entry retaining ventilation mode optimization method is characterized by comprising the following steps:
s1: determining a comparison data column; determining the number n of ventilation schemes and the number m of influencing factors of a working face after gob-side entry retaining after roof cutting and pressure relief; preparing a comparison data column according to the value of the ith scheme at the Kth influencing factor;
s2: determining a reference data column by adopting an expert analysis method;
s3: and calculating the relevance number of the data columns of the influence factors of each scheme to the reference data column to obtain the relevance degree, wherein the preferred ventilation mode is the mode with the high relevance degree.
2. The preferable method for the roof-cutting pressure-relief gob-side entry retaining ventilation mode according to claim 1 is characterized in that: the value of the ith solution at the Kth influencing factor in step S1 constitutes the comparison data column { x }i(K)}＝{xi(1),xi(2),...,xi(m)}(i＝1,2,...,n)。
3. The preferable method for the roof-cutting pressure-relief gob-side entry retaining ventilation mode according to claim 1 is characterized in that: the reference data column in step S2 is { x }0(K)}＝{x0(1),x0(2),...x0(m)}。
4. The preferable method for the roof-cutting pressure-relief gob-side entry retaining ventilation mode according to claim 1 is characterized in that: the calculation formula of the degree of association described in step S3 is as follows:
equation 1 is a correlation calculation equation, and equation 2 is a correlation calculation equation.
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Cited By (1)
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|---|---|---|---|---|
| CN112362248A (en) * | 2020-10-19 | 2021-02-12 | 太原理工大学 | System and method for detecting goaf air leakage rate under gob-side entry retaining mining in real time |
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