CN114278362A - Outburst prevention method for high gas mine area based on coal bed gas content classification analysis - Google Patents
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Abstract
The invention discloses a outburst prevention method for a high gas mine area based on coal bed gas content classification analysis, which relates to the technical field of coal mining and has the technical scheme that: establishing a plurality of standard critical values for carrying out partition grading outburst prevention treatment according to the gas content; acquiring coal seam gas content information, coal seam burial depth information and coal seam firmness coefficient of a target area; monitoring abnormal variable quantity of abnormal conditions of geological conditions in a target area, and comprehensively analyzing according to the abnormal variable quantity and the development degree of a corresponding geological structure to obtain a correction factor; correcting the standard critical value according to the correction factor to obtain an actual critical value; and matching the coal seam burial depth information, the coal seam firmness coefficient and the actual critical value from the database to obtain an outburst prevention strategy so as to perform outburst prevention processing on the target area by the outburst prevention strategy. The method can quickly match the outburst prevention strategy from the pre-constructed database, and is favorable for quickly developing outburst prevention treatment work in the high gas mine area.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a outburst prevention method for a high gas mine area based on coal bed gas content classification analysis.
Background
The coal mine excavation operation is full of gas, the safety production of the coal mine is directly threatened, and the gas control is not only a main task of the safety production of the coal mine, but also a main factor influencing the safety management of coal mine enterprises. Various high-strength mining equipment is continuously put into various coal mine enterprises at the present stage, so that the coal mine mining strength is increased, and the coal mine gas control is well performed to prevent coal mine gas outburst accidents, so that the problem that the enterprises at the present stage need to pay attention is solved.
At present, in the prior art, a geological structure zone is graded, different management measures are adopted for geological structures with different grades, and due to the complexity of the geological structure, various factors need to be considered when different management measures are adopted, such as coal seam gas content, coal seam depth, coal seam firmness and other factors, so that the measures possibly adopted are different according to different actual conditions. When the existing outburst prevention strategy in the high gas mine area is formed, the existing outburst prevention strategy generally depends on the experience of professionals and queries a large amount of standard documents, has the defects of large workload, poor timeliness of the outburst prevention strategy formation, higher requirement on professional skill knowledge and inconvenience for quickly developing outburst prevention treatment work in the high gas mine area.
Therefore, how to research and design a outburst prevention method based on coal bed gas content classification analysis for high gas mine areas, which can overcome the defects, is a problem which is urgently needed to be solved at present.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a outburst prevention method for a high gas mine area based on coal bed gas content grading analysis.
The technical purpose of the invention is realized by the following technical scheme: the outburst prevention method for the high gas mine area based on the coal bed gas content classification analysis comprises the following steps:
establishing a plurality of standard critical values for carrying out partition grading outburst prevention treatment according to the gas content;
acquiring coal seam gas content information, coal seam burial depth information and coal seam firmness coefficient of a target area;
monitoring abnormal variable quantity of abnormal conditions of geological conditions in a target area, and comprehensively analyzing according to the abnormal variable quantity and the development degree of a corresponding geological structure to obtain a correction factor;
correcting the standard critical value according to the correction factor to obtain an actual critical value;
and matching the coal seam burial depth information, the coal seam firmness coefficient and the actual critical value from the database to obtain an outburst prevention strategy so as to perform outburst prevention processing on the target area by the outburst prevention strategy.
Further, the standard critical value comprises a gas content of 16m3A first critical value of/t and a gas content of 8m3A second threshold value of/t.
Further, if the target area is a structural area, the standard critical value adopts the gas content of 6m3A third threshold value of/t.
Further, the abnormal condition comprises any combination of fault, wrinkle and soft layering thickness.
Further, the analysis and obtaining process of the correction factor specifically includes:
distributing a weight coefficient for each anomaly according to the type number of the anomaly conditions;
converting the abnormal variable quantity into a corresponding abnormal standard quantity according to the conversion coefficient;
and performing weight calculation according to the weight coefficient, the abnormal standard quantity and the degree coefficient representing the development degree to obtain the correction factor.
Further, the calculation formula of the correction factor is specifically as follows:
H＝α1Δn1k1 logm(mη1+p1)+…+αiΔniki logm(mηi+pi)
wherein H represents a correction factor; alpha is alpha1、αiWeighting coefficients respectively representing 1 st and i th abnormal conditions; Δ n1、ΔniThe abnormal variation respectively represents the 1 st and i th abnormal conditions; k is a radical of1、kiConversion coefficients respectively representing 1 st and i th abnormal conditions; m is constant and has a value range of [2,10 ]]；η1、ηiDegree coefficients respectively representing the 1 st and i th abnormal conditions are in the value ranges of (0, 1); p is a radical of1、piAre all constants, and the value range is [1, m ].
Further, if the value of the correction factor is greater than 1, the standard critical value is increased and corrected; and if the value of the correction factor is less than 1, reducing and correcting the standard critical value.
Furthermore, the outburst prevention strategy is matched according to a layered structure of the coal seam burial depth information, and the layered structure comprises a coal seam with the burial depth being more than 500m and a coal seam with the burial depth being less than 500 m.
Furthermore, the outburst prevention strategy is matched according to distribution intervals of the firmness coefficients of the coal seam, and the distribution intervals are divided according to three boundary values of 0.3, 0.5 and 0.8.
Furthermore, the outburst prevention strategy is further divided according to the coal roadway area and the mining face area.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the outburst prevention method for the high gas mine area based on coal bed gas content grading analysis, disclosed by the invention, gas content is monitored and analyzed in real time, and outburst prevention strategies can be matched from a pre-constructed database by combining various factors such as coal bed buried depth information, coal bed firmness coefficients, geological structure development degree and the like, so that the outburst prevention strategies are not required to be inquired by experience of professionals and standard documents, the timeliness of the outburst prevention strategies is high, the requirement on professional skill knowledge is low, and the outburst prevention treatment work of the high gas mine area can be rapidly developed;
2. according to the invention, the abnormal variable quantity is converted into the corresponding abnormal standard quantity through the conversion coefficient, the correction factors of the development degrees of different abnormal conditions on the standard critical value are dynamically simulated, the correction factors after the same standard quantity and through weight calculation are more in line with the actual influence condition, the dynamic adjustment of the standard critical value is realized, and the accurate matching of the outburst prevention strategy is facilitated.
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The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a flow chart in an embodiment of the invention;
FIG. 2 is a schematic diagram of gas control measures in different gas content areas according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example 1: the outburst prevention method for the high gas mine area based on coal bed gas content classification analysis is specifically realized by the following steps as shown in figure 1.
Step one, establishing a plurality of standard critical values for carrying out partition grading outburst prevention processing according to the gas content.
The standard critical value comprises a gas content of 16m3First critical value of/t and gas contentThe amount is 8m3A second threshold value of/t. If the target area is a structural area, the standard critical value adopts the gas content of 6m3A third threshold value of/t.
And step two, acquiring coal seam gas content information, coal seam burial depth information and coal seam firmness coefficient of the target area.
And step three, monitoring abnormal variable quantity of the geological condition abnormal condition in the target area, and comprehensively analyzing according to the abnormal variable quantity and the development degree of the corresponding geological structure to obtain a correction factor.
It should be noted that the abnormal condition includes, but is not limited to, fault, wrinkle, and soft delamination.
The analysis and acquisition process of the correction factor is specifically as follows: distributing a weight coefficient for each anomaly according to the type number of the anomaly conditions; converting the abnormal variable quantity into a corresponding abnormal standard quantity according to the conversion coefficient; and performing weight calculation according to the weight coefficient, the abnormal standard quantity and the degree coefficient representing the development degree to obtain the correction factor.
The calculation formula of the correction factor is specifically as follows:
H＝α1Δn1k1 logm(mη1+p1)+…+αiΔniki logm(mηi+pi)
wherein H represents a correction factor; alpha is alpha1、αiWeighting coefficients respectively representing 1 st and i th abnormal conditions; Δ n1、ΔniThe abnormal variation respectively represents the 1 st and i th abnormal conditions; k is a radical of1、kiConversion coefficients respectively representing 1 st and i th abnormal conditions; m is constant and has a value range of [2,10 ]]；η1、ηiDegree coefficients respectively representing the 1 st and i th abnormal conditions are in the value ranges of (0, 1); p is a radical of1、piAre all constants, and the value range is [1, m ].
And step four, correcting the standard critical value according to the correction factor to obtain an actual critical value.
If the value of the correction factor is larger than 1, increasing the standard critical value and correcting; and if the value of the correction factor is less than 1, reducing and correcting the standard critical value.
And step five, obtaining an outburst prevention strategy from the database in a matching mode according to the coal seam burial depth information, the coal seam firmness coefficient and the actual critical value, and carrying out outburst prevention processing on the target area through the outburst prevention strategy.
The outburst prevention strategy is matched according to a layered structure of the coal seam burial depth information, and the layered structure comprises a coal seam with the burial depth larger than 500m and a coal seam with the burial depth smaller than 500 m.
The outburst prevention strategy is matched according to the distribution interval of the firmness coefficient of the coal seam, and the distribution interval is divided according to three boundary values of 0.3, 0.5 and 0.8.
In addition, the outburst prevention strategy is further divided according to the coal roadway area and the mining face area.
Taking the Lu ' an mining area as an example for explanation, according to the geographical and geological structure distribution conditions of a main mine of the Lu ' an mining area, the Lu ' an mining area is integrally divided into four geological units by four normal faults of Wenwang mountain, Wenwei, Yangzze and Shanbei from north to south, and the I geological unit, the II geological unit, the III geological unit and the IV geological unit are sequentially arranged from north to south.
1. The gas content W of the coal bed is more than or equal to 16m3Region of/t
As shown in FIG. 2, for example, in the areas where the burial depth of the coal seam of the first geological unit is more than 641.9m, the burial depth of the coal seam of the second geological unit is more than 595.8m, the burial depth of the coal seam of the third geological unit is more than 611.6m and the burial depth of the coal seam of the fourth geological unit is more than 574.1m, the gas content of the coal seam exceeds 16m3T is calculated. The firmness coefficient of the coal seam in the mining range is less than 0.3; or the firmness coefficient of the coal seam is 0.3-0.5, and the burial depth is more than 500 m; or the firmness coefficient of the coal seam is 0.5-0.8, and the burial depth is more than 600 m; or the coal seam burial depth is more than 700 m; or the coal roadway strips are positioned in the outburst coal seam of the mining stress concentration area, and gas of the pre-pumped coal roadway strips drilled along the coal seam in the roadway construction cannot be used as an area outburst prevention measure. The average value of the firmness coefficients of main mining coal beds of geological units in the Luan mining area is below 0.5 generally, and the gas content in the coal beds is more than 16m3The burial depth of the area per ton exceeds 500m, so that the bedding drilling hole can not be pre-pumpedAnd (4) roadway stripe coal seam gas is used as a regional outburst prevention measure.
The gas content W of the coal seam is more than or equal to 16m3The outburst prevention strategy for the area matching of the/t area is as follows: firstly constructing a well to extract gas on the ground, and after the gas content of the coal seam is reduced to 16m3And/t is less than or equal to. And then, arranging a bottom suction roadway in the coal seam floor rock stratum, constructing a layer-penetrating drill hole from the bottom suction roadway, pre-sucking coal seam roadway stripe gas, and eliminating the outburst danger of a coal roadway tunneling working face. And the stoping working face adopts bedding drilling to pre-pump the coal seam gas in the stoping area.
The surface well is pre-pumped in advance, and the surface well spacing is temporarily set to 300m multiplied by 300 m. According to the gas content of the coal bed, the ground well pre-pumping time is different from 2 to 6 years.
And pre-pumping coal seam gas in the coal roadway strip by drilling the floor rock roadway through layer. According to the tunneling and maintenance conditions of rock roadways in the mining area, the distance is 3#And a rock tunnel with the section of 5.2m multiplied by 4.2m is tunneled in a bottom plate rock stratum with the coal seam vertical distance of 12m, and the tunnel is easy to tunnel and has good stability. And arranging the bottom plate lane in a bottom plate rock stratum which is 12m away from the coal seam in a vertical direction, arranging the bottom plate lane in an inner staggered crossheading mode, wherein the horizontal distance from the crossheading is 20m, and drilling through the bottom plate lane to the coal seam construction of the coal lane stripe.
Most of the area in the mining area is a nearly horizontal coal seam, and outline lines on two sides of the coal roadway are controlled to be not less than 15m by floor rock roadway crossing drilling. And arranging a group of cross-layer drill holes every 10m in the bottom suction lane, wherein the number of the drill holes in the group is 9. 2 rows of drilled holes are formed in the direction vertical to the trend of the roadway, the row spacing is 5m, the height of the drilled holes is 1.2m, and the spacing of the drilled positions is 1.6 m; the final holes are divided into 2 rows, and the positions of the final holes of each row of the drill holes are 5m away in the direction of the roadway and 5m away in the direction perpendicular to the direction of the roadway.
And the stoping working face adopts bedding drilling to pre-pump the coal seam gas in the stoping area. The coal seam bedding drill hole is constructed for pre-pumping, coal seam gas is pumped while mining in the stoping period after the coal seam gas is reduced to the target gas content (generally, the gas content meeting the extraction standard is adopted), the coal seam gas content is further reduced, and the gas emission quantity of a working face is reduced. Bidirectional bedding drill holes are respectively constructed from the gateway at two sides of the stope face to the direction of the face, two types of drill holes in different directions are overlapped for 10m in the middle of the face, the stope face length is generally between 200 and 300m according to the length condition of the stope face of the main mine at present, and the drill hole length is designed to be 105 to 155 m. The bedding drill holes are divided into two rows, the three-dimensional cross arrangement is adopted, namely the upper row of holes and the bedding groove are arranged in an included angle of 85 degrees, the lower row of holes and the bedding groove are arranged in an included angle of 75 degrees, the row spacing is 0.4m, and the upper row of drill holes and the lower row of drill holes are alternately arranged in the horizontal direction. The borehole spacing was tentatively 2.5 m.
2. Coal bed gas content (structural area 6 m)3/t)8m3/t≤W＜16m3Region of/t
As shown in figure 2, for example, in the areas with the burial depths of 451.4-641.9 m of the coal seam of the first geological unit, 462.5-595.8 m of the coal seam of the second geological unit, 211.6-611.6 m of the coal seam of the third geological unit and 277.9-574.1 m of the coal seam of the fourth geological unit, the content of coal seam gas is 8-16 m3Between/t. The average value of the firmness coefficient of main mining coal beds of geological units in the Lu' an mining area is generally below 0.5, the burial depth exceeds 500m or the firmness coefficient of the coal beds is less than 0.3, and gas of pre-pumping coal roadway strips along the coal bed in the roadway construction cannot be used as a regional outburst prevention measure.
Coal bed gas content (structural area 6 m)3/t)8m3/t≤W＜16m3The regional outburst prevention strategy of the/t region is as follows: when the burial depth is more than 500m or the firmness coefficient of the coal seam is less than 0.3, if an adjacent excavated roadway exists on the coal roadway excavation working face, pre-pumping sections by constructing bedding drill holes from the adjacent roadway to the excavation working face side, wherein the drill holes cover coal bodies in the range of not less than 15m on two sides of the roadway contour line so as to shield the roadway to perform safe excavation. If the excavated adjacent roadway does not exist, the gas control measure of the coal roadway excavation working face is the same as the coal seam gas content W which is more than or equal to 16m3And (4) arranging a bottom suction roadway in the rock stratum of the coal seam floor in the same way in the area of/t, constructing a cross-layer drilling hole from the bottom suction roadway, and pre-pumping coal seam coal roadway strip gas to eliminate outburst danger. The outburst prevention measure of the stope face area is the same as the coal seam gas content W is more than or equal to 16m3And (5) as same as the area per ton, adopting bedding drilling to pre-pump coal bed gas in the recovery area. When the burial depth is less than 500m, the coal roadway driving face adopts the coal seam drilling to pre-pump strips, the length of the head-on drilling is temporarily 150 or 160m according to the construction condition of the common drilling machine of each mine at present, and the drilling is divided into an upper drilling and a lower drillingThe drilling holes are arranged in 4 rows and 5 rows, the height between the opening positions of the two rows of drilling holes and the bottom plate is 1.4m and 2.2m respectively, the included angles between the 1 st drilling hole and the 2 nd drilling hole on the left side and the right side and the center line of the roadway are 2 degrees and 1 degree respectively, the rest middle drilling holes are constructed perpendicular to the section of the roadway, the elevation angles of all the drilling holes are 'coal seam inclination angle + 1-2 degrees', and the diameters of the drilling holes are phi 94 mm; arranging drill sites on two sides of the roadway in a stepping mode, wherein the distance between the drill sites on one side is 100m, the distance between the drill sites on two sides is 50m, and the section size of each drill site is as follows: the width of the drill site is 6.0m, the depth of the drill site is 4.3m, the drill site is equal to the height of the roadway, after the construction of the drill site is finished, drilling is immediately carried out, 6 drill holes are distributed in each drill site, namely, the drill holes are arranged in the drill site in a double-row three-cloth mode in the tunneling direction of the roadway, the opening positions of the two rows of drill holes are 1.4m and 2.2m away from a bottom plate, the drilling elevation angle is 'the coal seam inclination angle + 1-2 degrees', the drill holes are drilled in the same head-on direction in length, and the range of 15m outside two sides of the roadway is controlled. Pre-pumping coal bed gas after drilling construction is finished until the coal bed gas content is less than 8m3And when the time is/t, tunneling is allowed to be 100m, namely, a drilling advance distance of 50-60 m is reserved. In the area with good coal seam drilling hole forming, directional long drilling holes are constructed by adopting a directional drilling process to pre-pump coal roadway strip gas, the front length of the coal seam of the coal roadway strip is controlled to be not less than 300m by drilling, and the range outside the outline lines of two sides of the coal roadway is controlled to be 15m by drilling, so that outburst danger is eliminated, and the tunneling efficiency is improved. The outburst prevention measures of the stope face area are still the same as the coal seam gas content W which is more than or equal to 16m3And (5) as same as the area per ton, adopting bedding drilling to pre-pump coal bed gas in the recovery area. Directional long drilling hole pre-pumping coal seam gas in the coal roadway strip and bedding drilling hole pre-pumping coal seam gas in the stope area.
3. The gas content W of the coal bed is less than 8m3T (structural region 6 m)3Area of/t)
As shown in FIG. 2, the gas content of the coal bed is less than 8m3T (gas content of coal bed in structure influence area is less than 6m3Area of/t), not belonging to a prominent danger zone. In order to reduce the gas emission amount of the working face, the tunneling working face can adopt drilling holes along the coal seam to pre-pump the coal seam gas in the coal roadway strip, and the stoping working face can adopt drilling holes along the coal seam to pre-pump the coal seam gas in the stoping area.
The gas content of the coal bed is less than 8m3T (structural region 6 m)3The measures in the area/t) are: drilling along coal seam on tunneling working facePre-pumping coal roadway stripe gas, arranging drill sites on two sides of a roadway in a stepping manner, arranging a distance between one side drill sites and a distance between two side drill sites of 50m, immediately constructing drill holes after the construction of the drill sites is finished, arranging 6 drill holes on each drill site, namely, forming double rows of three-cloth arranged drill holes in the drill sites towards the tunneling direction of the roadway, wherein the heights of openings of the two rows of drill holes from a bottom plate are respectively 1.4m and 2.2m, the elevation angle of the drill holes is 'the coal seam inclination angle + 1-2 degrees', the length of the drill holes is 150 or 160m, controlling the range of 15m outside the two sides of the roadway, and simultaneously digging and pumping gas in the process of drilling and pumping gas. And adopting the same bedding drilling hole to pre-pump the coal bed gas in the stope area for outburst prevention measures in the stope face area.
The working principle is as follows: according to the outburst prevention strategy matching method, real-time monitoring and analysis are carried out on the gas content, the outburst prevention strategy can be matched from a pre-constructed database by combining various factors such as coal seam burial depth information, coal seam firmness coefficient, geological structure development degree and the like, the experience of professionals and standard document query are not relied on, the timeliness of the outburst prevention strategy formation is strong, the requirement on professional skill knowledge is low, and the outburst prevention treatment work of a high-gas mine area is facilitated to be rapidly expanded. In addition, the abnormal variable quantity is converted into the corresponding abnormal standard quantity through the conversion coefficient, the correction factors of the development degrees of different abnormal conditions to the standard critical value are dynamically simulated, the correction factors after the same standard quantity and after weight calculation better accord with the actual influence conditions, the dynamic adjustment of the standard critical value is realized, and the accurate matching of the outburst prevention strategy is facilitated.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The outburst prevention method for the high gas mine area based on coal bed gas content classification analysis is characterized by comprising the following steps:
establishing a plurality of standard critical values for carrying out partition grading outburst prevention treatment according to the gas content;
acquiring coal seam gas content information, coal seam burial depth information and coal seam firmness coefficient of a target area;
monitoring abnormal variable quantity of abnormal conditions of geological conditions in a target area, and comprehensively analyzing according to the abnormal variable quantity and the development degree of a corresponding geological structure to obtain a correction factor;
correcting the standard critical value according to the correction factor to obtain an actual critical value;
and matching the coal seam burial depth information, the coal seam firmness coefficient and the actual critical value from the database to obtain an outburst prevention strategy so as to perform outburst prevention processing on the target area by the outburst prevention strategy.
2. The method of claim 1, wherein the standard threshold value comprises a gas content of 16m3A first critical value of/t and a gas content of 8m3A second threshold value of/t.
3. The method of claim 2, wherein if the target area is a formation area, the standard threshold value is 6m gas content3A third threshold value of/t.
4. The method of claim 1, wherein the abnormal condition comprises any combination of fault, fold and soft layer thickness.
5. The high gas mine area outburst prevention method based on coal bed gas content classification analysis according to claim 1, wherein the analysis and obtaining process of the correction factor is specifically as follows:
distributing a weight coefficient for each anomaly according to the type number of the anomaly conditions;
converting the abnormal variable quantity into a corresponding abnormal standard quantity according to the conversion coefficient;
and performing weight calculation according to the weight coefficient, the abnormal standard quantity and the degree coefficient representing the development degree to obtain the correction factor.
6. The high gas mine area outburst prevention method based on coal bed gas content classification analysis according to claim 5, wherein the calculation formula of the correction factor is specifically as follows:
H＝α1Δn1k1logm(mη1+p1)+…+αiΔnikilogm(mηi+pi)
wherein H represents a correction factor; alpha is alpha1、αiWeighting coefficients respectively representing 1 st and i th abnormal conditions; Δ n1、ΔniThe abnormal variation respectively represents the 1 st and i th abnormal conditions; k is a radical of1、kiConversion coefficients respectively representing 1 st and i th abnormal conditions; m is constant and has a value range of [2,10 ]]；η1、ηiDegree coefficients respectively representing the 1 st and i th abnormal conditions are in the value ranges of (0, 1); p is a radical of1、piAre all constants, and the value range is [1, m ].
7. The outburst prevention method for the high gas mine area based on the coal bed gas content classification analysis according to claim 1, wherein if the value of the correction factor is greater than 1, the standard critical value is adjusted to be high and corrected; and if the value of the correction factor is less than 1, reducing and correcting the standard critical value.
8. The high gas mine area outburst prevention method based on coal seam gas content classification analysis according to claim 1, wherein the outburst prevention strategy is matched according to a layered structure of coal seam burial depth information, and the layered structure comprises a coal seam with a burial depth of more than 500m and a coal seam with a burial depth of less than 500 m.
9. The method for preventing outburst in the high gas mine area based on coal bed gas content classification analysis according to claim 1, wherein the outburst prevention strategy is matched according to distribution intervals of coal bed firmness coefficients, and the distribution intervals are divided according to three boundary values of 0.3, 0.5 and 0.8.
10. The method for preventing outburst of the high gas mine area based on the coal bed gas content classification analysis according to claim 1, wherein the outburst prevention strategy is further divided according to coal roadway areas and mining face areas.
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| CN115861588A (en) * | 2022-12-26 | 2023-03-28 | 贵州大学 | Coal mine fault identification method and system |
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