CN115146971A - Rock burst mine distinguishing and grading method based on equivalent depth - Google Patents
Rock burst mine distinguishing and grading method based on equivalent depth Download PDFInfo
- Publication number
- CN115146971A CN115146971A CN202210792315.9A CN202210792315A CN115146971A CN 115146971 A CN115146971 A CN 115146971A CN 202210792315 A CN202210792315 A CN 202210792315A CN 115146971 A CN115146971 A CN 115146971A
- Authority
- CN
- China
- Prior art keywords
- factor
- mine
- rock burst
- value
- coal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011435 rock Substances 0.000 title claims abstract description 172
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000003245 coal Substances 0.000 claims abstract description 156
- 238000005065 mining Methods 0.000 claims abstract description 28
- 239000011159 matrix material Substances 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000035939 shock Effects 0.000 claims 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 1
- 230000002265 prevention Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012850 discrimination method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- RVRCFVVLDHTFFA-UHFFFAOYSA-N heptasodium;tungsten;nonatriacontahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[W].[W].[W].[W].[W].[W].[W].[W].[W].[W].[W] RVRCFVVLDHTFFA-UHFFFAOYSA-N 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
- G06Q10/06393—Score-carding, benchmarking or key performance indicator [KPI] analysis
-
- 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
- G06F17/16—Matrix or vector computation, e.g. matrix-matrix or matrix-vector multiplication, matrix factorization
-
- 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
- G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Forestry; Mining
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- General Physics & Mathematics (AREA)
- Human Resources & Organizations (AREA)
- Theoretical Computer Science (AREA)
- Data Mining & Analysis (AREA)
- Mathematical Physics (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Analysis (AREA)
- Computational Mathematics (AREA)
- Economics (AREA)
- Strategic Management (AREA)
- Entrepreneurship & Innovation (AREA)
- Tourism & Hospitality (AREA)
- Software Systems (AREA)
- Development Economics (AREA)
- Educational Administration (AREA)
- Databases & Information Systems (AREA)
- Algebra (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Marketing (AREA)
- Operations Research (AREA)
- General Business, Economics & Management (AREA)
- Game Theory and Decision Science (AREA)
- Agronomy & Crop Science (AREA)
- Computing Systems (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Bioinformatics & Computational Biology (AREA)
- Evolutionary Biology (AREA)
- Probability & Statistics with Applications (AREA)
- Quality & Reliability (AREA)
- Animal Husbandry (AREA)
- Marine Sciences & Fisheries (AREA)
- Mining & Mineral Resources (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Primary Health Care (AREA)
Abstract
The invention relates to a rock burst mine distinguishing and grading method based on equivalent depth, which belongs to the field of coal mining rock burst disaster prevention.
Description
Technical Field
The invention belongs to the field of coal mining rock burst disaster prevention, and particularly relates to a rock burst mine distinguishing and grading method based on equivalent depth.
Background
With the increase of the energy demand and the increase of the exploitation depth in China, most mines in China will enter a deep mining stage in the coming decades, the geological occurrence conditions of deep coal mining are complex, and more coal mining processes are accompanied with rock burst disaster display. The rock burst is sudden, instantaneous and great in destructiveness, and great property loss and casualties are caused to safe production of coal mines. Therefore, whether the mine is the rock burst mine or not is an important premise and basis for developing rock burst prevention and control in a coal mine, whether the mine is the rock burst mine or not is scientifically judged, and the classification of the rock burst mine grade becomes an important requirement for deep coal safety mining.
At present, the rock burst mine in China is determined according to the rock burst power phenomenon or coal seam impact tendency identification and impact risk evaluation result, wherein the rock burst power phenomenon is difficult to determine, and if the rock burst accident occurs and the mine is determined to be the rock burst mine, great property loss or casualties are caused; the method for identifying the coal bed impact tendency and evaluating the impact risk is difficult to adapt to the coal mining conditions under the new situation in China at present, the method is complex in process, numerous in influencing factors and greatly influenced by human factors, so that the rock burst mine distinguishing process is not scientific, the rock burst of a non-rock burst mine or the improper situation of the rock burst mine prevention is caused, and troubles and problems are brought to the mine rock burst prevention.
Researches find that the occurrence of rock burst is comprehensively influenced by geological factors such as mining depth, coal bed factors, geological structure factors, impact tendency factors and overburden factors, is a control quantity for influencing whether the mine generates the rock burst, is an objectively existing invariant factor, and is also an internal factor for the rock burst. Therefore, the rock burst mine distinguishing and grading method based on the mining depth is provided, so that the rock burst mine distinguishing and grading process is scientifically standardized, the important premise that whether rock burst prevention and control and prevention degree are carried out in the current mine is solved, the important research direction for carrying out rock burst source control is also carried out, and the rock burst mine distinguishing and grading method has great significance for avoiding property loss and casualties caused by rock burst disasters.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a rock burst mine distinguishing and grading method based on equivalent depth so as to achieve the aim of scientifically, simply and intuitively distinguishing whether a mine is a rock burst mine.
The purpose of the invention is realized by the following technical scheme: the rock burst mine distinguishing and grading method based on equivalent depth comprises the following steps:
the method comprises the following steps: and (5) collecting parameters. Collecting mine geological environment parameters, including coal seam thickness, inclination angle and variation coefficient in mine coal seam factors, mine geological structure complexity in geological structure factors, ratio of stress increment to normal stress value, coal seam and top and bottom plate impact tendency results in impact tendency factors, top roof rock thickness characteristic parameters above the coal seam in overburden factors, distance parameters between a hard thick rock layer and the coal seam in a fracture zone, uniaxial compressive strength of coal of each coal layer, overburden bulk density (average bulk density of rock can be used and can be respectively calculated according to an actual mine stratum comprehensive histogram), impact energy index of coal, mining depth of a mining working face in a mine planning period and the like;
step two: the critical depth at which rock burst occurs is calculated. Calculating the critical depth H of the rock burst of the mine according to the formula (1) cr ：
In the formula, σ c The uniaxial compressive strength of the coal body is MPa; gamma is the volume weight of the overlying rock stratum, can be calculated by the average volume weight of the rock or the comprehensive histogram of the mine stratum, and has the unit of MP/m; k E The impact energy index of the coal is obtained by measuring according to the impact tendency of the coal and is dimensionless; eta 1 To correct the coefficient, the coal body uniaxial compressive strength is related,
and (4) dimensionless. When multiple coal seams are mined, the critical depth of rock burst is respectively calculated, and the minimum critical depth is selected as the index of the discrimination method.
Step three: the equivalent depth is calculated. The method comprises the following steps of (1) obtaining an equivalent depth by taking the maximum mining depth H of a mining working face in a mine planning period as a basic index and considering coal bed factors, geological structure factors, impact tendency factors and overburden factors, wherein the equivalent depth H is calculated according to a formula (2):
H＝(1+q 1 L 1 +q 2 L 2 +q 3 L 3 +q 4 L 4 )×h (2)
in the formula, each parameter is determined according to the condition of a working face planned and mined in the next three years of a mine, wherein h is the maximum depth of the working face in the mine planning period and the unit is m; q. q.s 1 The weight of the coal bed factors is considered, and the method is dimensionless; l is 1 The value is taken by considering the coal bed factors, and the dimension is not large; q. q.s 2 The weight of geological structure factors is considered, and the method is dimensionless; l is 2 The value is taken by considering the geological structure factor, and the dimension is not needed; q. q.s 3 In order to consider the weight of the impact tendency factor, the method is dimensionless; l is 3 The values are taken in order to consider the impact tendency factor, and the dimensions are not large; q. q of 4 The method is dimensionless for considering overburden factor weight; l is 4 The values are taken for considering the factors of the overlying strata, and are dimensionless.
Wherein the weight q of the coal bed factor 1 Weight q of geologic structure factor 2 Weight q of impact tendency factor 3 To, onOverburden factor weight q 4 The calculation process of (c) is as follows:
(1) and constructing a rock burst influence factor judgment matrix. According to the mine rock burst situation, comparing every two of the four factors for judging the mine to obtain the importance degree of the mine rock burst, and constructing a factor judgment matrix P ij The following formula (3):
wherein, the right diagonal element P of the matrix 12 Representing the value of the important degree of the coal bed factor compared with the geological structure factor for judging the mine rock burst; p 13 Representing the value of the important degree of the coal bed factor to the mine rock burst judgment compared with the impact tendency factor; p 14 Representing the value of the important degree of the coal bed factor compared with the overburden factor for judging the mine rock burst; p is 23 Representing the value of the important degree of the geological structure factor to the judgment of the mine rock burst compared with the impact tendency factor; p 24 Representing the value of the important degree of the geological structure factor compared with the overburden stratum factor to the judgment of the mine rock burst; p 33 Representing the value of the important degree of the impact tendency factor to the mine rock burst judgment compared with the overburden factor; the left diagonal element definition of the matrix is opposite to the right diagonal element definition, and the value of the left diagonal element definition is the reciprocal of the right diagonal value.
P ij The value range of each element in the matrix is an integer or the reciprocal of the integer between 1 and 9; 1 indicates that two elements have the same significance compared; 3 indicates that the former is slightly more important than the latter in comparison with the two elements; 5 indicates that the former is significantly more important than the latter in comparison with the two elements; 7 indicates that the former is more important than the latter in comparison with the two elements; 9 indicates that the former is extremely important than the latter in comparison with the two elements; other numerical values represent the degree of importance between adjacent levels of importance; similarly, the reciprocal of an integer between 1 and 9 indicates the degree of importance of the latter over the former.
(2) Calculating the weight q of each influence factor: calculating the weight occupied by the four factors according to the formula (4);
in the formula, i is 1-4 and is respectively corresponding to the weight value q of the coal bed factor 1 And a geological structure factor weight value q 2 Tendency to impact factor weight value q 3 And overburden factor weight value q 4 。
Coal bed factor value L 1 Value L of geological structure factor 2 The value of the impact tendency factor L 3 Value L of overburden factor 4 The value range of (1) is 0-1, and the value process is as follows:
(1) dividing the coal bed factor into three sub-factors of coal mine thickness factor, dip angle factor and coal bed thickness variation factor, dividing the value range of the index of the three sub-factors, and obtaining the coal bed factor L according to the actual condition of the mine 1 Value result, coal bed factor L 1 Factor L of coal seam thickness 11 + coal bed dip factor L 12 + factor of variation of coal thickness L 13 。
(2) Dividing the geological structure factor into two sub-factors of the complexity of the geological structure of the mine and the ratio of the stress increment caused by the structure to the normal stress value, dividing the value range of the index of the two sub-factors, and obtaining the geological structure factor L by contrasting with the actual condition of the mine 2 Value result, geological structure factor L 2 = mine geological structure complexity L 21 + structure induced stress increase to normal stress value ratio L 22 。
(3) Impact tendency factor L 3 Dividing three sub-factors of the impact tendency factor of coal, the impact tendency factor of a roof rock stratum and the impact tendency factor of a bottom rock stratum into three sub-factor index value ranges, obtaining the value result of the impact tendency factor according to the actual condition of a mine, and obtaining the impact tendency factor L 3 = coal impact tendency factor L 31 + roof strata impact propensity factor L 32 + floor rock formation impact tendency factor L 33 。
(4) Overburden factor L 4 Divided into the thickness of the roof rock layer above the coal seamDividing two sub-factors of a degree characteristic parameter factor and a distance factor between a hard thick rock layer in an overlying fracture zone and a coal bed, dividing the value range of two sub-factor indexes, obtaining an overlying rock layer factor value result according to the actual condition of a mine, and obtaining an overlying rock layer factor L 4 = characteristic parameter factor L of roof rock thickness above coal seam 41 + distance factor L between internal hard thick rock layer and coal seam of overlying fissure zone 42 。
Step four: and judging whether the mine is a rock burst mine or not. Critical depth for equivalent depth H and rock burst to occur cr Comparing, when the equivalent depth H of the mine is more than or equal to H cr Judging the mine to be a rock burst mine; when equivalent depth H of mine<H cr And judging the mine to be a non-rock burst mine.
Step five: and judging the rock burst mine grade. And when the mine is judged to be the rock burst mine, dividing the rock burst mine into three levels, namely a weak rock burst mine, a medium rock burst mine and a strong rock burst mine.
When H is present cr ≤H＜1.5H cr Judging the mine to be a weak rock burst mine;
when 1.5H cr ≤H＜2H cr Judging the mine to be a medium rock burst mine;
when H is more than or equal to 2H cr And judging the mine to be a mine with strong rock burst.
The invention has the beneficial effects that: the method comprises the steps of taking the mine mining depth as a basic index, considering four types of factors including coal bed factors, geological structure factors, impact tendency factors and overlying strata factors to obtain the equivalent depth of the mine, comparing the equivalent depth with the critical depth by calculating the critical depth of the occurrence of the rock burst of the mine, and judging the mine as the rock burst mine when the equivalent depth of the mine is greater than or equal to the critical depth of the occurrence of the rock burst; and when the equivalent depth of the mine is less than the critical depth of the rock burst, judging the mine is a non-rock burst mine. And determining the grade of the mine rock burst by the equivalent depth in the critical depth range for the rock burst mine. The method realizes the discrimination and grade division of the rock burst mine, adopts the grading management measures aiming at different grades to achieve the aim of grading management of the rock burst mine, has the characteristics of science, simplicity, intuition and strong operability, can be used as a rock burst mine discrimination and grade division method of a rock burst mine authentication unit, can be used as an important basis for guiding the coal mine safety production and supervising, checking and developing the rock burst prevention and control of the coal mine safety production, and has great significance for avoiding the coal mine rock burst accident and ensuring the coal mine safety production.
Drawings
Fig. 1 is a flow chart of rock burst mine discrimination and grading based on equivalent depth.
Detailed Description
Step S1: and collecting certain coal mine basic parameters. The coal mine is a single coal seam mining, through analysis of the rock burst of the coal mine, the condition of a mining working face in the planning period of the coal mine in the last three years is collected, the average thickness of the coal seam is 6.5m, the average dip angle of the coal seam is 3 degrees, the variation coefficient of the thickness of the coal seam is 0.22, and the complexity of the geological structure of the coal mine is medium by looking up a geological specification of the coal mine; consulting a mine ground stress test report to obtain the maximum main stress of 31.2MPa of the mine; looking up a coal bed impact tendency identification report to obtain that the impact tendency of the coal is strong impact tendency, the impact tendency of the top plate rock stratum is weak impact tendency, and the bottom plate rock stratum has no impact tendency; looking up a mine comprehensive histogram and combining the geological drilling histogram to obtain a characteristic parameter of the thickness of a roof rock layer above a coal seam, wherein the characteristic parameter is 62m, and the distance between a hard thick layer rock layer in an overlying fracture zone and the coal seam is 40m; and uniaxial compressive strength σ of coal c The coal impact energy index is 29.23MPa, the coal impact energy index is 19.97, the average value of the volume weight of the overlying strata is 0.025MP/m, and the maximum mining depth of a planned mining working face is 750m.
Step S2: according to the formula
Calculating to obtain the critical depth H of rock burst cr ＝1.262×29.23×(1+1/19.97)/2/0.025＝775m。
And step S3: the method comprises the following steps of constructing a judgment matrix of the mine rock burst influence factors:
(1) And (3) synthesizing the conditions of the mine rock burst, comparing the four factors pairwise to obtain the importance degree of the mine rock burst, and constructing a judgment matrix of each factor, wherein the judgment matrix is shown in table 1.
TABLE 1 determination matrix for rock burst influencing factors
| Factor of rock burst | Coal bed factor 1 | Geologic structure factor 2 | Impact tendency factor 3 | Overburden factor 4 |
| Coal bed factor 1 | 1 | 1/5 | 1/7 | 4 |
| Geologic structure factor 2 | 5 | 1 | 1/3 | 2 |
| Impact propensity factor 3 | 7 | 3 | 1 | 1/5 |
| Overburden factor 4 | 1/4 | 1/2 | 5 | 1 |
(2) And calculating the weight q of the mine rock burst influencing factor. According to
Formula, calculating to obtain coal bed factor weighted value q 1 =0.014, geologic structure factor weighted value q 2 =0.404, impact propensity factor weight q 3 =0.508, overburden factor weight value q 4 ＝0.076。
(3) And determining the value L of each influencing factor of the mine, wherein the value range of each factor is 0-1.
1) As shown in table 2, the coal seam factors are divided into four-level indexes, namely a coal seam thickness factor, a coal seam inclination angle factor and a coal seam thickness variation factor, wherein the coal seam thickness factor indexes are divided according to a thin coal seam, a thick coal seam, a medium-thick coal seam and an extra-thick coal seam; dividing the coal seam dip factor indexes according to a nearly horizontal coal seam, a slowly inclined coal seam, an inclined coal seam and a steeply inclined coal seam; the coal seam variation factor indexes are divided according to the variation range of the coal seam thickness, and compared with the average coal seam thickness of 6.5m, the average coal seam inclination angle of 3 degrees and the variation coefficient of the coal seam thickness of 0.22 basic parameters in the step S1, the coal seam factor = the coal seam thickness factor value of 0.22+ the coal seam inclination angle factor value of 0.00+ the coal thickness variation factor value of 0.11, the coal seam factor value result L is obtained 1 ＝0.33。
TABLE 2 coal bed factor indices and values
Description of the drawings: the mining condition of multiple coal seams is respectively calculated, the value of each coal layer is calculated, and the maximum value is selected as L 1 (ii) a Coefficient of variation of coal thickness
Wherein n is the total number of coal points, x i In order to see the actual measurement of the coal thickness at the coal points,
is the average coal thickness.
2) As shown in table 3, the geological structure factor is divided into four-level indexes of two sub-factors, i.e., the complexity of the geological structure of the mine and the ratio of the stress increment caused by the structure to the normal stress value, wherein the complexity index of the geological structure is divided into simple, medium, complex and extremely complex indexes, and values are taken according to the conclusion of the geological specification of the mine; dividing the ratio index of the stress increment and the normal stress value into four levels, taking the average value of the volume weight of the overlying strata to be 0.025MP/m according to the conclusion of the mine ground stress test report and the volume weight value of the overlying strata in the comparison step S1, wherein the complexity of the mine geological structure is medium, the maximum main stress of the mine in the ground stress test is 31.2MPa, the average value of the volume weight of the overlying strata is 0.025MP/m, the maximum mining depth of the planned mining working face is 750m basic parameters, and the ratio of the stress increment and the normal stress value caused by the geological structure factor = the value of the complexity of the mine geological structure of 0.17+ structure is 0.17 to obtain the value L of the geological structure factor value result L 2 ＝0.34。
TABLE 3 indices of geologic structure factors and values
Description of the drawings: geological complexity L of mine 21 Selecting according to the mine geological specification; p = (σ) max - σ)/σ = (31.2-0.025 × 750)/(0.025 × 750) =0.64, where σ max σ is the maximum principal stress, σ is the vertical stress, σ = γ H, and γ is the overburden bulk weight.
3) As shown in Table 4, the impact tendency factor L 3 The three-level indexes of three sub-factors of impact tendency factor of coal, impact tendency factor of roof rock stratum and impact tendency factor of floor rock stratum are divided, wherein the impact tendency of coal, the impact tendency of roof rock stratum and the impact tendency of floor rock stratum areThe layer impact tendency is determined according to the national standard of rock burst monitoring and control method — part 1: determination methods for roof rock formation impact tendency classification and index (GB/T25217.1) and methods for determining, monitoring and preventing rock burst pressure-part 2: the classification of coal seam impact tendency and the determination method of indexes (GB/T25217.2) are obtained by carrying out experiments. And comparing the impact tendency of the coal in the step S1 with strong impact tendency, the impact tendency of the roof strata with weak impact tendency, the floor strata with no impact tendency basic parameters, the impact tendency factor = 0.33 of the impact tendency factor of the coal + 0.17 of the impact tendency factor of the roof strata + 0.00 of the impact tendency factor of the floor strata, and the value of the impact tendency factor is 0.50.
TABLE 4 impact tendentiousness factor indices and values
Description of the drawings: the mining condition of multiple coal seams is respectively calculated, the impact tendency factor score of each layer is respectively calculated, and the maximum value is selected as L 3 。
4) As shown in Table 5, overburden factor L 4 Dividing the characteristic parameter factor of the thickness of the roof rock layer above the coal seam and the distance factor of the hard thick rock layer in the overlying fissure zone from the coal seam into two sub-factor four-level indexes, wherein the characteristic parameter factor of the thickness of the roof rock layer above the coal seam and the distance index of the hard thick rock layer in the overlying fissure zone from the coal seam are divided according to the thickness of the hard rock layer and are obtained according to a mine comprehensive histogram and a geological drilling histogram; and comparing the characteristic parameter of the thickness of the roof rock layer above the coal seam in the step S1 to be 62m, the distance between the hard thick rock layer in the overlying fissure zone and the coal seam is 40m basic parameter, and the overlying rock factor = 0.17 of the characteristic parameter factor of the thickness of the roof rock layer above the coal seam + 0.33 of the distance between the hard thick rock layer in the overlying fissure zone and the coal seam, so as to obtain the value of the overlying rock factor to be 0.50.
TABLE 5 overburden factor index and value
Description of the drawings: and (4) calculating the overburden factor T, respectively calculating the overburden factor score of each layer of coal according to the mine comprehensive histogram and the multi-coal-bed mining condition, and selecting the maximum value as the value T. Characteristic parameter T = Σ h of roof strata thickness above coal seam i r i ，h i Thickness of the ith rock layer above the roof, r i And selecting the mining influence range above the coal bed in the T calculation process as the weak face decreasing coefficient of the rock stratum, wherein the mining influence range is not less than 100m.
(4) The ore equivalent depth is calculated. The equivalent depth of the mine is calculated according to the following data: h = (1 q) 1 L 1 +q 2 L 2 +q 3 L 3 +q 4 L 4 )×h＝(1+0.014×0.33+0.404×0.34+0.508×0.50+0.076×0.50)×750＝1075m
And step S4: and judging whether the mine is a rock burst mine or not. The equivalent depth H =1075m is obtained by calculation, the critical depth of rock burst is 775m, and the equivalent depth H of the mine is more than or equal to H cr Therefore, the mine is judged to be impacted.
Step S5: and judging the grade of the mine rock burst. The rock burst mine is divided into three levels, namely a weak rock burst mine, a medium rock burst mine and a strong rock burst mine, wherein 775m is smaller than equivalent depth H =1075m and is smaller than 775 multiplied by 1.5m, and the rock burst mine is judged to be the weak rock burst mine.
Aiming at the mine result judged as the weak rock burst level, the mine is managed according to the weak rock burst mine in the mine supervision, inspection and field rock burst prevention, the coal mine is mainly monitored and early-warned on the basis of rock burst risk evaluation and anti-scour design, when the monitoring is dangerous, danger relieving measures are taken, and meanwhile, the supervision and inspection frequency is properly increased by the upper-level department of the coal mine, so that the coal mine is ensured not to have rock burst accidents.
In the embodiment of the invention, all sub-factors, grading indexes of the sub-factors and grading division of the rock burst mine are only used for reference. The actual use of the method is not limited to the above parameters, and any modifications, equivalents, and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The rock burst mine distinguishing and grading method based on equivalent depth is characterized by comprising the following steps of:
the method comprises the following steps: collecting parameters: collecting mine geological environment parameters;
step two: calculating the critical depth of occurrence of rock burst: calculating the critical depth H of the rock burst of the mine according to the formula (1) cr ：
In the formula, σ c The uniaxial compressive strength of the coal body is MPa; gamma is the volume weight of the overburden stratum and the unit is MP/m; k E Is the impact energy index of the coal; eta 1 In order to correct the coefficients of the coefficients,
step three: calculating equivalent depth H: the equivalent depth H is calculated according to equation (2):
H＝(1+q 1 L 1 +q 2 L 2 +q 3 L 3 +q 4 L 4 )×h (2)
in the formula, h is the maximum depth in a mining working face in a mine planning period and the unit is m; q. q.s 1 Considering the weight of coal bed factors; l is 1 Taking values for considering coal bed factors; q. q.s 2 Weighting for considering geological structure factors; l is 2 Taking values for considering geological structure factors; q. q of 3 To take impact propensity factor weight into account; l is a radical of an alcohol 3 Taking values for considering impact tendency factors; q. q.s 4 To account for overburden factor weights; l is 4 Taking values for considering overburden factors;
step four: judging whether the mine is a rock burst mine: by taking place of the equivalent depth H obtained in step three and the rock burst obtained in step twoCritical depth H cr Comparing, when the equivalent depth H of the mine is more than or equal to H cr Judging the mine to be a rock burst mine; when equivalent depth H of mine<H cr Judging the mine to be a non-rock burst mine;
step five: and (3) judging the mine grade of rock burst: when the mine is judged to be a rock burst mine, dividing the rock burst mine into three levels, namely a weak rock burst mine, a medium rock burst mine and a strong rock burst mine;
when H is present cr ≤H＜1.5H cr Judging the mine to be a weak rock burst mine;
when the temperature is higher than the set temperature 1.5H cr ≤H＜2H cr Judging the mine to be a medium rock burst mine;
when H is more than or equal to 2H cr And judging the mine to be a mine with strong rock burst.
2. The method for discriminating and grading a rock burst mine based on equivalent depth according to claim 1, wherein the mine geological environment parameters of step one comprise: the method comprises the following steps of determining the thickness, the inclination angle and the coefficient of variation of a coal bed in mine coal bed factors, the ratio of the complexity of the mine geological structure, the stress increment and a normal stress value in the geological structure factors, the impact tendency results of the coal bed and a top floor in the impact tendency factors, the characteristic parameter of the thickness of a top roof rock layer above the coal bed, the distance parameter of a hard thick rock layer in a fracture zone from the coal bed, the uniaxial compressive strength of coal of each coal bed, the volume weight of the upper rock layer, the impact energy index of the coal and the mining depth of a mining working face in a mine planning period.
3. The method for judging and grading rock burst mines according to the equivalent depth as claimed in claim 1, wherein the coal bed factor weight q in step three 1 Weight q of geologic structure factor 2 Weight of shock tendency factor q 3 Overburden factor weight q 4 The calculation process of (2) is as follows:
(1) constructing a rock burst influence factor judgment matrix: according to the rock burst condition of the mine, four main types of the mine are judgedThe control factors are compared pairwise to obtain the importance degree of the occurrence of the mine rock burst, and a judgment matrix P of each factor is constructed ij Formula (3):
wherein the right diagonal element P of the matrix 12 Representing the value of the important degree of the coal bed factor compared with the geological structure factor for judging the mine rock burst; p 13 Representing the value of the important degree of the coal bed factor to the mine rock burst judgment compared with the impact tendency factor; p 14 Representing the value of the importance degree of the coal bed factors to the judgment of the mine rock burst compared with the overburden factors; p 23 Representing the value of the important degree of the geological structure factor to the judgment of the mine rock burst compared with the impact tendency factor; p is 24 Representing the value of the important degree of the geological structure factor compared with the overburden stratum factor to the judgment of the mine rock burst; p 33 Representing the value of the important degree of the impact tendency factor to the mine rock burst judgment compared with the overburden factor; the left diagonal element definition of the matrix is opposite to the right diagonal element definition, and the value of the left diagonal element definition is the reciprocal of the right diagonal value.
P ij Each element in the matrix takes the value range of an integer between 1 and 9 or the reciprocal thereof; 1 indicates that two elements have the same significance compared; 3 indicates that the former is slightly more important than the latter in comparison with the two elements; 5 indicates that the former is significantly more important than the latter in comparison with the two elements; 7 indicates that the former is more important than the latter in comparison with the two elements; 9 indicates that the former is extremely important than the latter in comparison with the two elements; other numerical values represent the degree of importance between adjacent levels of importance; similarly, the reciprocal of an integer between 1 and 9 indicates the degree of importance of the latter to the former.
(2) Calculating the weight q of each influence factor: calculating the weight occupied by the four factors according to the formula (4);
in the formula, i is 1-4 and is respectively corresponding to the weight value q of the coal bed factor 1 And a geological structure factor weight value q 2 Weight of shock tendency factor q 3 And overburden factor weight value q 4 。
4. The method for distinguishing and grading rock burst mines according to claim 1, wherein the coal bed factor value L in step three is 1 Value L of geological structure factor 2 The value of the impact tendency factor L 3 Value L of overburden factor 4 The value range of (2) is 0-1, and the value process is as follows:
(1) dividing the coal bed factor into three sub-factors of the coal bed thickness factor, the dip angle factor and the coal bed thickness variation factor, dividing the value range of the index of the three sub-factors, and obtaining the coal bed factor L according to the actual situation of the mine m Value result, coal bed factor L 1 Factor L of coal seam thickness 11 + coal bed dip factor L 12 + factor of variation of coal thickness L 13 ；
(2) Dividing the geological structure factor into two sub-factors of the complexity of the geological structure of the mine and the ratio of the stress increment caused by the structure to the normal stress value, dividing the value range of the index of the two sub-factors, and obtaining the geological structure factor L by contrasting with the actual condition of the mine 2 Value result, geological structure factor L 2 = mine geological structure complexity L 21 + structure induced stress increase to normal stress value ratio L 22 ；
(3) Impact propensity factor L 3 Dividing three sub-factors of coal impact tendency factor, roof rock stratum impact tendency factor and floor rock stratum impact tendency factor, dividing three sub-factor index value ranges, obtaining impact tendency factor value results according to mine actual conditions, and obtaining impact tendency factor L 3 = impact propensity factor of coal L 31 + roof strata impact propensity factor L 32 + floor rock formation impact tendency factor L 33 ；
(4) Overburden factor L 4 Is the thickness of the top plate rock stratum above the coal bedTwo sub-factors of parameter factors and the distance between the hard thick-layer rock stratum in the overburden fissure zone and the coal seam are characterized, the value range of the two sub-factor indexes is divided, the value result of the overburden factor is obtained by contrasting the actual condition of the mine, and the value result of the overburden factor L is obtained 4 Characteristic parameter factor L of roof rock thickness above coal bed 41 + distance factor L between internal hard thick rock layer and coal seam of overlying fissure zone 42 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210792315.9A CN115146971A (en) | 2022-07-07 | 2022-07-07 | Rock burst mine distinguishing and grading method based on equivalent depth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210792315.9A CN115146971A (en) | 2022-07-07 | 2022-07-07 | Rock burst mine distinguishing and grading method based on equivalent depth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115146971A true CN115146971A (en) | 2022-10-04 |
Family
ID=83411872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210792315.9A Pending CN115146971A (en) | 2022-07-07 | 2022-07-07 | Rock burst mine distinguishing and grading method based on equivalent depth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115146971A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116843228A (en) * | 2023-07-21 | 2023-10-03 | 昆明理工大学 | Coal seam impact tendency evaluation method based on fuzzy set theory and combined weighting |
-
2022
- 2022-07-07 CN CN202210792315.9A patent/CN115146971A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116843228A (en) * | 2023-07-21 | 2023-10-03 | 昆明理工大学 | Coal seam impact tendency evaluation method based on fuzzy set theory and combined weighting |
| CN116843228B (en) * | 2023-07-21 | 2024-05-14 | 昆明理工大学 | Coal seam impact tendency evaluation method based on fuzzy set theory and combined weighting |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105785471B (en) | A kind of shock hazard evaluation method of the pre- working seam of mine | |
| CN111859288A (en) | Method for predicting spontaneous combustion risk of goaf | |
| Qu et al. | Multi-model fusion for assessing risk of inrush of limestone karst water through the mine floor | |
| CN115146971A (en) | Rock burst mine distinguishing and grading method based on equivalent depth | |
| CN114169789A (en) | Coal mine rock burst prediction method based on hierarchical analysis and fuzzy comprehensive judgment | |
| CN109707453A (en) | A kind of permanent chamber impact Safety Argumentation method of coal mine | |
| CN111784136A (en) | Impact risk dynamic early warning method based on hierarchical analysis and fuzzy mathematics | |
| CN111127234A (en) | Method and device for determining first mining layer of outburst coal seam group mining | |
| CN112100851A (en) | Method for evaluating tunnel water inrush disaster risk based on set pair analysis | |
| CN115994398A (en) | Method for evaluating collapse risk of deep-buried granite tunnel | |
| CN114294062B (en) | Time-space dynamic comprehensive early warning method for rock burst | |
| CN114371509A (en) | Well leakage evaluation method based on comprehensive index method | |
| CN107784437B (en) | Stress concentration-based coal roadway driving face outburst danger identification method | |
| CN109558976A (en) | Method for identifying dangerousness of rock burst based on multi-dimensional information | |
| Latrach et al. | Identification and quantification of the effect of fracture-driven interactions on production from parent and child wells in Williston Basin | |
| CN114063152A (en) | Rock burst main control factor determination method based on mine earthquake statistical characteristics | |
| CN111046595A (en) | Typical and atypical rock burst mine type dividing method | |
| CN116070907A (en) | Karst collapse susceptibility assessment method and system based on analytic hierarchy process | |
| CN114692410A (en) | Mine dynamic disaster estimation method based on geostress field inversion numerical range analysis | |
| CN114320268A (en) | Large-diameter drilling pressure relief effect evaluation method based on drilling stress monitoring | |
| CN115310748A (en) | Soft soil settlement risk fuzzy evaluation method based on combined empowerment | |
| CN113027439A (en) | Intelligent coal mining geological exploration method and device | |
| CN116843228B (en) | Coal seam impact tendency evaluation method based on fuzzy set theory and combined weighting | |
| CN112241835A (en) | Deep shaft project water inrush disaster multi-source information evaluation method | |
| CN115526389A (en) | Coal mine dynamic disaster geological risk prediction method based on sedimentary facies |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |