Gas disaster risk emergency linkage comprehensive early warning method

Abstract

The invention relates to a gas disaster risk emergency linkage comprehensive early warning method, and belongs to the field of coal mine safety production disaster prevention and control. An existing assessment method depends on a single gas index to cause one-sided risk assessment inaccuracy. The scheme of the invention comprises the following steps: acquiring gas content or pressure, a coal firmness coefficient, a burial depth, a coal seam inclination angle and a coal seam thickness parameter of a to-be-assessed region; calculating a gas initial grade Y1, a coal body structure influence degree Y2, a burial depth influence degree Y3, a dip angle influence degree Y4 and a thickness influence degree Y5 based on a formula; averaging Y1 to Y5 to obtain an average value, and comprehensively rating Y; and dividing five risk levels according to the Y value. According to the method, the risk assessment accuracy and reliability are remarkably improved, clear and scientific grading guidance is provided, fine emergency management can be conveniently implemented on a coal mine site, and operability and popularization and application value are enhanced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of coal mine safety production, disaster prevention and emergency rescue, and particularly relates to a gas disaster risk comprehensive assessment and early warning method based on multiple geological and production factors. BACKGROUND

[0002] Gas disaster is one of the main disasters in coal production, and accurate assessment of its risk level is the core link of selecting effective prevention methods and identifying risk levels, which directly affects the decision of manpower, material and financial investment in gas disaster prevention of the mine. However, the gas disaster risk level assessment methods in the prior art mostly rely on a single gas content or gas pressure index for judgment. This single-dimensional assessment method has significant limitations and cannot comprehensively, truly and accurately reflect the actual gas disaster risk faced by the mine working face, so it cannot provide fine and graded effective guidance for the gas disaster prevention work of the coal mine. Therefore, a more scientific and comprehensive comprehensive assessment method is urgently needed to improve the accuracy and reliability of gas disaster risk assessment. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a gas disaster risk emergency linkage comprehensive early warning method which can comprehensively consider multiple influencing factors to more accurately and reliably assess the gas disaster risk level.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0005] A gas disaster risk emergency linkage comprehensive early warning method, comprising the following steps:

[0006] Obtaining the gas content W or gas pressure P, the coal firmness coefficient f, the burial depth h, the coal seam inclination angle a and the coal seam thickness H of the area to be evaluated;

[0007] Based on the gas content W or gas pressure P, the initial grade Y1 of the gas disaster is evaluated;

[0008] Based on the coal firmness coefficient f, the influence degree Y2 of the coal body structure on the gas disaster risk is analyzed;

[0009] Based on the burial depth h, the influence degree Y3 of the coal seam burial depth on the gas disaster risk is analyzed;

[0010] Based on the coal seam inclination angle a, the influence degree Y4 of the coal seam inclination angle on the gas disaster risk is analyzed;

[0011] Based on the coal seam thickness H, the influence degree Y5 of the coal seam thickness on the gas disaster risk is analyzed;

[0012] The Y1, Y2, Y3, Y4, Y5 are averaged to obtain a gas disaster risk comprehensive rating Y, and a comprehensive evaluation of the gas disaster risk grade is realized.

[0013] Further, the calculation formula of the gas disaster initial grade Y1 is:

[0014] Y1=max{a1·W,b1·P+c1}

[0015] Wherein, a1, b1, c1 are parameters for determining the initial grade of the gas disaster risk.

[0016] When the calculated Y1 is less than 1, Y1=1.

[0017] Further, the value of a1 is 0.25; the value of b1 is 2.5; and the value of c1 is 0.

[0018] Further, the calculation formula of the influence degree of the coal body structure on the gas disaster risk Y2 is:

[0019]

[0020] Wherein, a2, b2 are parameters for the influence degree of the coal body structure on the gas disaster risk.

[0021] When the calculated Y2 is less than 1, Y2=1.

[0022] Further, the value of a2 is 7.3; and the value of b2 is -2.5.

[0023] Further, the calculation formula of the influence degree of the coal seam depth on the gas disaster risk Y3 is:

[0024] Y3=a3·h+b3

[0025] Wherein, a3, b3 are parameters for the influence degree of the depth on the gas disaster risk.

[0026] When the calculated Y3 is less than 1, Y3=1.

[0027] Further, the calculation formula of the influence degree of the coal seam inclination on the gas disaster risk Y4 is:

[0028] Y4=a4·ln(α)+b4

[0029] Wherein, a4, b4 are parameters for the influence of the coal seam inclination on the gas disaster.

[0030] When the calculated Y4 is less than 1, Y4=1.

[0031] Further, the calculation formula of the influence degree of the coal seam thickness on the gas disaster risk Y5 is:

[0032] Y5 = max{a5·ln(H) + b5, 0.5H}

[0033] Where a5 and b5 are parameters on the impact of coal seam burial depth on gas disasters;

[0034] When the calculated Y5 is less than 1, set Y5 = 1.

[0035] Furthermore, the formula for calculating the comprehensive gas disaster risk rating Y is as follows:

[0036]

[0037] Furthermore, it also includes classifying gas disaster risk into five levels based on the comprehensive gas disaster risk rating Y:

[0038] When 1≤Y<2, it is level one;

[0039] When 2≤Y<3, it is level two;

[0040] When 3≤Y<4, it is level three;

[0041] When 4 ≤ Y < 5, it is level four;

[0042] When Y≥5, it is level 5.

[0043] The beneficial effects of this invention are as follows:

[0044] (1) By comprehensively considering five core factors, namely gas content / pressure, coal body firmness, burial depth, coal seam dip angle and coal seam thickness, this invention overcomes the one-sidedness of traditional methods that rely on only a single indicator, making the risk assessment results closer to the actual working conditions and greatly improving the accuracy and reliability of the assessment.

[0045] (2) This invention provides a complete quantitative calculation model that converts various influencing factors into comparable risk level values ​​and finally obtains a comprehensive rating, providing clear and scientific graded guidance for coal mine gas disaster prevention and control, and facilitating the implementation of differentiated and refined safety management measures.

[0046] (3) The evaluation indicators selected in this invention are all conventional geological parameters that are available or easy to measure in coal mine production. The calculation method is clear. It not only provides accurate formula calculation, but also provides a grade classification table that is easy to use in daily management. It has strong on-site operability and promotion application value.

[0047] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0048] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0049] Figure 1 The relationship between gas content and the initial level of gas disaster;

[0050] Figure 2 The f-value represents the degree of influence of gas disaster risk.

[0051] Figure 3 The degree of impact of burial depth on the risk of gas disasters;

[0052] Figure 4 The degree of influence of coal seam dip angle on gas disaster risk;

[0053] Figure 5 This refers to the degree of influence of coal seam thickness on the risk of gas disasters. Detailed Implementation

[0054] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0055] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0056] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0057] This invention is a comprehensive assessment method for gas hazard risk levels, belonging to the fields of coal mine safety production, disaster prevention and control, and emergency rescue. It includes the following steps:

[0058] S1: Obtain the gas content W / pressure P of the coal seam, region, or mining face, and assess the initial level Y1 of the corresponding gas hazard.

[0059] S2: Obtain the firmness coefficient f of coal seam, region or mining face, and analyze the degree of influence of coal structure on gas disaster risk from the perspective of coal body resistance to gas disaster risk Y2;

[0060] S3: Obtain the burial depth of the coal seam, region, or mining face floor, and analyze the degree of influence of coal seam burial depth on gas disaster risk. Y3:

[0061] S4: Obtain the dip angle of the coal seam, region, or mining face, and analyze the degree of influence of the coal seam dip angle on the risk of gas disasters. Y4;

[0062] S5: Obtain the thickness of coal seams, regions, or mining faces, and analyze the degree of influence of coal seam thickness on gas disaster risk. Y5:

[0063] S6: Calculate the average value of Y1, Y2, Y3, Y4, and Y5 to comprehensively rate the gas hazard risk level Y. This enables a comprehensive assessment of the gas hazard risk level of a coal seam, region, or mining face.

[0064] S1: Obtain the gas content W / pressure P of the coal seam, region, or mining face, and assess the initial level of the corresponding gas disaster risk; when Y1<1, let Y1=1.

[0065] Y1=max{a1·W,b1·P+c1} (1)

[0066] In the formula, Y1 represents the initial risk level of gas disaster in the coal seam, region, or mining face;

[0067] a1, b1, and c1 are parameters for determining the initial risk level of gas disasters. a1 is generally between 0.2 and 0.5, but in this invention, it is set to 0.25 for ease of classifying the five risk levels. b1 is generally between 2 and 5, but in this invention, it is set to 2.5 for ease of classifying the five risk levels. c1 is generally between 0 and 0.5, but in this invention, it is set to 0 for ease of classifying the five risk levels.

[0068] W represents the gas content of the coal seam, region, or mining face; m 3 / t;

[0069] P represents the gas pressure in the coal seam, area, or mining face, in MPa;

[0070] Relationship between gas content and initial level of gas disaster Figure 1 As shown. The higher the gas content W / pressure P, the greater the gas disaster. In addition to using formula (1) to calculate the initial level of gas disaster in detail, the initial level of gas disaster can also be divided into five levels for convenient daily management and use. Therefore, the initial five levels of gas disaster risk can be divided according to the conditions in Table 1.

[0071] Table 1

[0072] Gas disaster initial level Gas content / m 3 / t]] Gas pressure / Mpa First level 4≤W＜8 0.4≤P＜0.8 Second level 8≤W＜12 0.8≤P＜1.2 Third level 12≤W＜16 1.2≤P＜1.6 Fourth level 16≤W＜20 1.6≤P＜2.0 Fifth level W≥20 P≥2.0

[0073] S2: Obtain the firmness coefficient f of coal seam, region or mining face, and analyze the degree of influence of coal structure on gas disaster risk Y2 from the perspective of coal body resistance to gas disaster risk; when Y2<1, let Y2=1.

[0074] The coal firmness coefficient f-value is an important standard for assessing the risk level of gas disasters. The smaller the coal firmness coefficient, the greater the risk of gas disasters. When encountering geological structures, the coal firmness coefficient will generally decrease.

[0075]

[0076] In the formula, Y2 represents the degree of influence of the coal seam, region, or coal body structure of the mining face on the risk of gas disasters;

[0077] a2 and b2 represent parameters indicating the degree of influence of coal body structure on gas disaster risk. a2 is generally between 7 and 8, but in this invention, it is set to 7.3 for ease of classifying the five risk levels. b2 is generally between -2 and -3, but in this invention, it is set to -2.5 for ease of classifying the five risk levels.

[0078] f represents the firmness coefficient f value of coal seam, region or mining face;

[0079] The degree of influence of f-value on gas disaster risk is as follows: Figure 2 As shown.

[0080] For ease of daily management and application, the impact of coal seam firmness on gas hazard risk can be classified into five levels according to the conditions in Table 2:

[0081] Table 2

[0082] Degree of influence of coal body structure on gas disaster risk Coal body firmness coefficient f value First level 0.8≤f＜0.5 Second level 0.5≤f＜0.35 Third level 0.35≤f＜0.25 Fourth level 0.25≤f＜0.15 Fifth level f≤0.15

[0083] S3: Obtain the burial depth of the coal seam, region, or mining face floor, and analyze the degree of influence of coal seam burial depth on gas disaster risk Y3; when Y3<1, let Y3=1.

[0084] The burial depth of the coal seam, region, or mining face floor (hereinafter referred to as burial depth) is an important indicator of ground stress. The deeper the burial depth, the greater the ground stress and the greater the gas disaster.

[0085] Y3=a3·h+b3 (3)

[0086] In the formula, Y3 represents the degree of impact of the coal seam, region, or mining face burial depth on the risk of gas disasters;

[0087] a3 and b3 are parameters representing the degree of influence of burial depth on gas disaster risk. a3 is generally between 0.002 and 0.01. In this invention, for the convenience of classifying the five risk levels, it is set to 0.005. b3 is generally between 0 and 1. In this invention, for the convenience of classifying the five risk levels, it is set to 0.

[0088] h represents the coal seam, region, or coal burial depth of the mining face, in meters;

[0089] The impact of burial depth on the risk of gas disasters, such as Figure 3 As shown.

[0090] For ease of daily management and application, the impact of burial depth on gas hazard risk can be classified into five levels according to the conditions in Table 3:

[0091] Table 3

[0092] Degree of influence of buried depth on gas disaster risk Buried depth h / m First level 200≤h＜400 Second level 400≤f＜600 Third level 600≤f＜800 Fourth level 800≤f＜1000 Fifth level f≥1000

[0093] S4: Obtain the dip angle of the coal seam, region, or mining face, and analyze the degree of influence of the coal seam dip angle on the gas disaster risk Y4; when Y4<1, let Y4=1.

[0094] The dip angle of a coal seam is key to the generation of self-weight stress in the coal body. The larger the dip angle, the greater the self-weight force and the worse the stability of the coal body.

[0095] Y4=a4·ln(α)+b4 (4)

[0096] Among them, Y4 represents the risk level of the impact of coal seam burial depth on gas disasters;

[0097] a4 and b4 are parameters on the influence of coal seam dip angle on gas disasters. a4 is generally between 2 and 5. In this invention, it is taken as 4 for the convenience of classifying the five risk levels. b4 is generally between -3 and -10. In this invention, it is taken as -8 for the convenience of classifying the five risk levels.

[0098] α represents the dip angle of the coal seam, region, or mining face, in degrees;

[0099] The degree of influence of coal seam dip angle on gas disaster risk is as follows: Figure 4 As shown.

[0100] For ease of daily management and application, the impact of coal seam dip angle on gas hazard risk can be classified into five levels according to the conditions in Table 4:

[0101] Table 4

[0102]

[0103]

[0104] S5: Obtain the thickness of the coal seam, region, or mining face, and analyze the degree of influence of coal seam thickness on gas disaster risk Y5; when Y5<1, let Y5=1.

[0105] Y5=max{a5·ln(H)+b5,0.5H} (5)

[0106] In the formula, Y5 represents the risk level of the impact of coal seam thickness on gas disasters;

[0107] a5 and b5 are parameters on the impact of coal seam burial depth on gas disasters. a5 is generally between 1 and 5. In this invention, it is set to 3 for the convenience of classifying the five risk levels. b5 is generally between -1 and -5. In this invention, it is set to -3 for the convenience of classifying the five risk levels.

[0108] H represents the thickness of the coal seam, region, or mining face, in meters;

[0109] The impact of coal seam thickness on gas disaster risk is as follows: Figure 5 As shown.

[0110] For ease of daily management and application, the impact of coal seam thickness on gas hazard risk can be classified into five levels according to the conditions in Table 5:

[0111] Table 5

[0112] Degree of influence of coal seam thickness on gas disaster risk Coal seam inclination H / m First level 4≤H＜5 Second level 5≤H＜8 Third level 8≤H＜10 Fourth level 10≤H＜15 Fifth level H≥15

[0113] S6: Calculate the average value of Y1, Y2, Y3, Y4, and Y5 to comprehensively rate the gas hazard risk level Y. This enables a comprehensive assessment of the gas hazard level of a coal seam, region, or mining face.

[0114]

[0115] For ease of daily management and application, the comprehensive assessment of gas hazard risk levels can be divided into five levels according to the conditions in Table 6:

[0116] Table 6

[0117] Comprehensive rating of gas disaster risk Y First level 1≤Y＜2 Second level 2≤Y＜3 Third level 3≤Y＜4 Fourth level 4≤Y＜5 Fifth level Y≥5

[0118] The calculation, judgment and parameters of various degrees and levels of influence in this invention can be varied. The key is that the risk level of gas disaster needs to be comprehensively judged in conjunction with five major factors: gas content / pressure, coal body firmness coefficient, burial depth, coal seam dip angle and coal seam thickness.

[0119] Assume the geological and production parameters of a coal mine working face are as follows:

[0120] 1. Obtain the parameters of the area to be evaluated:

[0121] Gas content W = 10m 3 / t (or gas pressure P = 1.0 MPa)

[0122] The coal's soundness coefficient f = 0.4

[0123] Burial depth h = 400m

[0124] Coal seam dip angle α = 30°

[0125] Coal seam thickness H = 3m

[0126] 2. Assess the initial gas hazard level Y1:

[0127] Using the formula Y1=max{a1*W,b1*P+c1}, where a1=0.25,b1=2.5,c1=0, we can calculate: Y1=max{0.25*10,2.5*1.0+0}=max{2.5,2.5}=2.5. If Y1<1, then let Y1=1; in this example, Y1=2.5, which meets the requirements.

[0128] 3. Analysis of the impact of coal seam structure on gas hazard risk Y2:

[0129] Use formula Where a² = 7.3, b² = -2.5

[0130] Calculate: Y² = 7.3e -2.5×0.4 ≈2.68

[0131] If Y2 < 1, then let Y2 = 1; in this example, Y2 ≈ 2.68, which meets the requirements.

[0132] 4. Analysis of the impact of coal seam depth on gas hazard risk (Y3):

[0133] Use the formula Y3 = a3·h + b3, where a3 = 0.005 and b3 = 0.

[0134] Calculate: Y3 = 0.005 * 400 + 0 = 2.0

[0135] If Y3 < 1, then let Y3 = 1; in this example, Y3 = 2.0, which meets the requirements.

[0136] 5. Analysis of the impact of coal seam dip angle on gas hazard risk (Y4):

[0137] Use the formula Y4 = a4·ln(α) + b4, where a4 = 4 and b4 = -8.

[0138] Calculate: Y4=4×ln(30)-8≈5.60

[0139] If Y4 < 1, then let Y4 = 1; in this example, Y4 ≈ 5.60, which meets the requirements.

[0140] 6. Analysis of the impact of coal seam thickness on the risk of gas disasters (Y5):

[0141] Using the formula Y5=max{a5·ln(H)+b5,0.5H}, where a5=3, b5=-3

[0142] Calculate: Y5=max{3×ln(3)+(-3),0.5×3}≈max{0.2958,1.5}=1.5. If Y5<1, then set Y5=1; in this example, Y5=1.5, which meets the requirements.

[0143] 7. Calculate the comprehensive risk rating Y for gas disasters:

[0144] Use formula

[0145] Calculate: Y = (2.5 + 2.68 + 2.0 + 5.60 + 1.5) / 5 ≈ 13.28 / 5 ≈ 2.656

[0146] 8. Classify gas hazard risk levels:

[0147] Based on Y = 2.656, it falls under level two risk: 2 ≤ Y < 3.

[0148] Corresponding emergency measures: Strengthen monitoring and local protection.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A comprehensive early warning method for emergency response to gas disaster risks, characterized in that: Includes the following steps: Obtain the gas content W or gas pressure P, coal firmness coefficient f, burial depth h, coal seam dip angle α, and coal seam thickness H of the area to be evaluated; Based on the gas content W or gas pressure P, assess the initial gas hazard level Y1; Based on the coal's firmness coefficient f, the influence of coal structure on gas disaster risk Y2 is analyzed; Based on the burial depth h, the influence of coal seam burial depth on gas disaster risk Y3 is analyzed; Based on the coal seam dip angle α, analyze the degree of influence of the coal seam dip angle on the gas disaster risk Y4; Based on the coal seam thickness H, analyze the degree of influence Y5 of coal seam thickness on gas disaster risk; The average value of Y1, Y2, Y3, Y4, and Y5 is calculated to obtain the comprehensive gas disaster risk rating Y, thus achieving a comprehensive assessment of the gas disaster risk level.

2. The integrated early warning method for emergency response to gas disaster risks according to claim 1, characterized in that: The formula for calculating the initial gas hazard level Y1 is as follows: Y1 = max{a1·W, b1·P + c1} Where a1, b1, and c1 are the parameters for determining the initial level of gas disaster risk; When the calculated Y1 is less than 1, let Y1 = 1.

3. The integrated early warning method for emergency response to gas disaster risks according to claim 2, characterized in that: The value of a1 is 0.25; the value of b1 is 2.5; and the value of c1 is 0.

4. The integrated early warning method for emergency response to gas disaster risks according to claim 1, characterized in that: The formula for calculating the degree of influence of the coal body structure on the gas disaster risk Y2 is as follows: Where a2 and b2 represent parameters indicating the degree of influence of coal body structure on gas disaster risk; When the calculated Y2 is less than 1, let Y2 = 1.

5. The integrated early warning method for emergency response to gas disaster risks according to claim 4, characterized in that: The value of a2 is 7.3; the value of b2 is -2.

5.

6. The integrated early warning method for emergency response to gas disaster risks according to claim 1, characterized in that: The formula for calculating the impact of coal seam burial depth on gas disaster risk Y3 is as follows: Y3=a3·h+b3 Wherein, a3 and b3 are parameters representing the degree of influence of burial depth on gas disaster risk; When the calculated Y3 is less than 1, let Y3 = 1.

7. The integrated early warning method for emergency response to gas disaster risks according to claim 1, characterized in that: The formula for calculating the impact of the coal seam dip angle on the gas disaster risk Y4 is as follows: Y4=a4·ln(α)+b4 Where a4 and b4 are parameters related to the influence of coal seam dip angle on gas hazards; When the calculated Y4 is less than 1, let Y4 = 1.

8. The integrated early warning method for emergency response to gas disaster risks according to claim 1, characterized in that: The formula for calculating the impact of coal seam thickness on the gas disaster risk Y5 is as follows: Y5 = max{a5·ln(H) + b5, 0.5H} Where a5 and b5 are parameters on the impact of coal seam burial depth on gas disasters; When the calculated Y5 is less than 1, set Y5 = 1.

9. The integrated early warning method for emergency response to gas disaster risks according to claim 1, characterized in that: The formula for calculating the comprehensive risk rating Y of gas disasters is as follows: This also includes classifying gas disaster risk into five levels based on the comprehensive gas disaster risk rating Y value: When 1≤Y<2, it is level one; When 2≤Y<3, it is level two; When 3≤Y<4, it is level three; When 4 ≤ Y < 5, it is level four; When Y≥5, it is level 5.

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