CN115860314B - Method and system for preventing and controlling coal seam working face impact danger based on surface ditch - Google Patents
Method and system for preventing and controlling coal seam working face impact danger based on surface ditch Download PDFInfo
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Abstract
The invention discloses a method and a system for preventing and controlling coal seam working face impact danger based on a surface ditch, wherein the method comprises the following steps: counting data of earth surface gullies in the range of the target mine; acquiring the impact risk level of the drop of the coal seam according to the data of the earth surface ditch; then, calculating impact dangerous results of other factors of the earth surface gully at different mining stages of the coal face to obtain impact dangerous grades at different mining stages of the coal bed; the impact risk level of the drop of the ditch of the coal bed and the impact risk levels of different mining stages of the coal bed are coupled to obtain the impact risk level in the area where the surface ditch is located; and adopting an adaptive control means according to the impact danger level in the area of the surface ditch and the type of the working face of the coal bed. The control blank before rock burst is induced by the earth surface gully is made up. The method is high in efficiency, economical, safe and targeted, can solve the problem that the rock burst is influenced by the earth surface gully, and achieves the purpose of accurately preventing and controlling the rock burst.
Description
Technical Field
The invention relates to the field of coal mine rock burst, in particular to a method and a system for preventing and controlling coal seam working face impact danger based on a surface ditch.
Background
The rock burst of the coal mine is one of serious mine dynamic disasters, and the rock burst accident not only hinders the production of the coal mine, but also threatens the life and property safety of personnel in a mining area. The impact risk evaluation before working face exploitation is an important means for preventing and controlling coal mine rock burst, and is a requirement definitely specified in the rule for preventing and controlling coal mine rock burst, but the influence caused by surface ditches is not considered in the existing working face impact risk evaluation.
In addition, at present, the research of students at home and abroad on the surface gullies is mainly focused on the problem of the mine pressure of the shallow coal seam, and the research on the rock burst of the surface gullies on the coal seam is relatively less, but the rock burst easily occurs when the coal face passes through the gully areas, so that the safe and efficient production of mines is severely restricted.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method and a system for preventing and controlling the impact danger of a coal seam working face based on a surface ditch, which specifically comprise the following steps:
the invention provides a method for preventing and controlling coal seam working face impact danger based on a surface ditch, which comprises the following steps:
s1, counting data of earth surface gullies in a range of a target mine;
s2, acquiring the drop impact risk grade of the coal bed according to the data of the surface ditch, and determining the coal bed under the influence of the surface ditch to acquire a target coal bed;
s3, calculating data of other control factors of the working face of the target coal seam in different mining stages, and obtaining impact risk levels of the working face of the target coal seam in different mining stages according to the drop impact risk levels and the data of the other control factors;
s4, coupling the drop impact risk level of the target coal seam and the impact risk level of the target coal seam in different mining stages to obtain the impact risk level in the area where the surface gully is located;
and S5, adopting an adaptive control means according to the impact danger level in the area of the surface gully and the type of the working face of the target coal seam.
Preferably, the data of the surface gullies in the range of the statistical target mine in S1 includes:
s101, counting the number of earth surface ditches and the characteristics of the earth surface ditches in a target mine range;
s102, dividing the types of the surface ditches according to the number of the surface ditches and the characteristics of the surface ditches.
Preferably, in the statistical target mine range of S101, the number of surface ditches and the characteristics of the surface ditches include:
the number and characteristics of the surface gullies with the drop height of more than 100 m are counted, wherein the characteristics of the surface gullies with the drop height of more than 100 m comprise: the drop height and the angle of the earth surface gully;
the step S102 of dividing the types of the surface ditches according to the number of the surface ditches and the characteristics of the surface ditches comprises the following steps:
and classifying the earth surface gullies with the drop height more than 100 m according to the drop height and the angle of the earth surface gullies.
Preferably, the step S2 of obtaining the drop impact risk level of the coal bed according to the data of the surface ditch, and determining the coal bed under the influence of the surface ditch, where obtaining the target coal bed includes:
calculating the drop of the working surface corresponding to the mining stage of the coal bed to obtain the drop impact dangerous grade of the coal bedKThe calculation rule of the drop impact risk level of the coal seam comprises the following steps:
when (when)3h≤HIn the time-course of which the first and second contact surfaces,K=W；
when (when)2h≤H＜3hIn the time-course of which the first and second contact surfaces,K=R；
when (when)0.5h≤H＜2hIn the time-course of which the first and second contact surfaces,K=Z；
when (when)0≤H＜0.5hIn the time-course of which the first and second contact surfaces,K=Q；
wherein ,Kin order to fall impact risk level,his the drop of the earth's surface gully,Hfor the depth of burial of the working surface,Win order to be of a no-impact risk class,Wthe value is 0;Rin order to be a weak impact hazard class,Rthe value is 0.25;Zin the middle impact risk level of the vehicle,Zthe value is 0.5;Qin order to be of a high impact risk level,Qthe value is 0.75;
screening the coal bed affected by the surface ditch according to the drop impact risk level of the coal bed to obtain a target coal bed, wherein the coal bed affected by the surface ditchKThe values satisfy:K≥0.25。
preferably, the calculating of the step S3, when the working surface of the target coal seam is in different mining stages, the calculating of the data of other control factors, and obtaining the impact risk level of the working surface of the target coal seam in different mining stages according to the drop impact risk level and the data of the other control factors includes:
calculating impact risk levels of other control factors of each surface ditch, wherein the other control factors of the surface ditches comprise ditch slope feet, ditch widths and ditch angles;
impact risk level of the gully toeLThe calculation rule of (1) includes:
when 0 is≤α＜20°In the time-course of which the first and second contact surfaces,L=W；
when (when)20°≤α＜40°In the time-course of which the first and second contact surfaces,L=R；
when (when)40°≤α＜60°In the time-course of which the first and second contact surfaces,L=Z；
when (when)60°≤αIn the time-course of which the first and second contact surfaces,L=Q；
wherein ,αis the gully toe;
impact hazard rating of the gully widthMThe calculation rule of (1) includes:
when 200m≤dIn the time-course of which the first and second contact surfaces,M=W；
when (when)100m≤d＜150mIn the time-course of which the first and second contact surfaces,M=R；
when (when)50m≤d＜100mIn the time-course of which the first and second contact surfaces,M=Z；
when (when)0m≤d＜50mIn the time-course of which the first and second contact surfaces,M=Q；
wherein ,dis the width of the gully;
impact risk level of the gully angleNThe calculation rule of (1) includes:
when 200 °≤θIn the time-course of which the first and second contact surfaces,N=W；
when (when)100°≤θ＜150In the case of a degree of the degree,N=R；
when (when)50°≤θ＜100In the case of a degree of the degree,N=Z；
when (when)0°≤θ＜50In the case of a degree of the degree,N=Q；
wherein ,θis the angle of the gully;
the level of risk of falling head impact is controlled according to the order of the numerical values from large to smallKIs the value of the impact risk level of the gully toeLImpact risk rating of number of gully widthMImpact risk rating of the number and gully angle of (2)NThe values of (2) are arranged;
determining a control factor corresponding to the maximum value as a main control factor of the working face of the target coal seam in the mining stage;
determining a control factor corresponding to the numerical value of the second position in the arrangement sequence as a secondary control factor of the working face of the target coal seam in the exploitation stage;
determining a control factor corresponding to the numerical value of the third position in the arrangement sequence as a third factor of the working face of the target coal seam in the exploitation stage;
and determining a control factor corresponding to the numerical value of the fourth bit of the arrangement sequence as a fourth factor of the working face of the target coal seam in the mining stage.
Preferably, the step of S4 coupling the drop impact risk level of the target coal seam and the impact risk level of the target coal seam at different mining stages, and obtaining the impact risk level in the area where the surface gully is located includes:
the calculation formula for coupling the drop impact risk level of the target coal seam and the mining stage impact risk level of the target coal seam is formula (1):
wherein ,λ 1 、λ 2 、λ 3 、λ 4 as a result of the coupling coefficient,λ 1 0.5 part,λ 2 Is 0.4 part,λ 3 Is 0.1 andλ 4 is 0, wherein,λ 1 the coupling coefficient representing the master factor,λ 2 representing the coupling coefficient of the secondary master factor,λ 3 the coupling coefficient representing the third factor is,λ 4 the coupling coefficient representing the fourth factor,Ois the coupling impact danger value;
impact risk level in the area of the earth's surface gullyPThe calculation rule of (1) includes:
when 0 is≤O＜0.25In the time-course of which the first and second contact surfaces,P=W；
when 0.25≤O＜0.5In the time-course of which the first and second contact surfaces,P=R；
when 0.5≤O＜0.75In the time-course of which the first and second contact surfaces,P=Z；
when (when)0.75≤OIn the time-course of which the first and second contact surfaces,P=Q。
preferably, according to the impact danger level in the area of the surface ditch and the type of the working face of the target coal seam, the adaptive control means comprise:
classifying the working surfaces of the target coal seam, wherein the working surfaces of the target coal seam comprise working surfaces in planning and designing and working surfaces in production;
regional control is carried out on the working surface in the planning and design according to the impact danger level in the region where the earth surface gully corresponding to the working surface in the planning and design is located;
and carrying out regional control on the working surface under production according to the impact danger level in the region of the earth surface gully corresponding to the working surface under production.
Preferably, the rule for regional control of the working surface in the planning and design includes:
when no impact danger level exists, regional control is not performed;
in the case of a weak impact risk level or a medium impact risk level, the method for regional control comprises: changing the arrangement mode of the working surface, reducing the frequency of the ascending stage and increasing the length of the trench bottom stage;
in the case of a strong impact hazard class, the method for regional control comprises: changing the arrangement mode of the working face, reducing the number of ascending stages, increasing the length of the trench bottom stage and filling and mining the working face.
Preferably, the impact risk level of the working surface being produced in the area where the working surface is jointed with the corresponding earth surface gully, and the regional control of the working surface being produced comprises:
when no impact danger level exists, regional control is not performed;
in the case of a weak impact risk level or a medium impact risk level, the method for regional control comprises: weakening the top plate, changing the mining speed and releasing pressure of coal seam drilling;
in the case of a strong impact hazard class, the method for regional control comprises: weakening the roof, changing the mining speed, drilling and releasing the pressure of the coal seam and filling and mining the working face.
A system for controlling risk of coal seam face impact based on a surface ditch, comprising:
the statistics module is used for counting data of the earth surface gullies in the range of the target mine;
the screening module is used for obtaining the drop impact dangerous grade of the coal bed according to the data of the surface ditch, determining the coal bed under the influence of the surface ditch and obtaining a target coal bed;
the calculation module is used for calculating data of other control factors when the working face of the target coal seam is in different mining stages, and obtaining impact danger levels of the working face of the target coal seam in different mining stages according to the data of the other control factors;
the coupling module is used for coupling the drop impact dangerous grade of the target coal seam and impact dangerous grades of different mining stages of the target coal seam to obtain the impact dangerous grade in the area where the surface gully is located;
and the control module is used for adopting an adaptive control means according to the impact danger level in the area where the surface ditch is located and the type of the working face of the target coal seam.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention makes up for the blank of prevention and control before rock burst is induced by the earth surface gully. The invention takes earth surface gullies and coal mine rock burst disasters as research objects, and aims to solve the influence of the earth surface gullies on rock burst. Firstly, counting the number and characteristics of earth surface gullies in the whole mine range according to an earth surface topography of a mining area, and dividing the types of the earth surface gullies; secondly, judging whether the coal bed is in the influence range of the gully; if the main control factors are within the influence range of the gully, identifying main control factors of the gully area on the earth surface, including fall, slope toe, width and included angle between the gully and the working surface; after determining the main control factors of the gullies, dividing the impact dangers of the working face; finally, according to the area division result of the impact risk, regional-local control measures are adopted, and after effect evaluation, the working surface passes through the surface valley area. The method is high in efficiency, economical, safe and targeted, can solve the problem that the rock burst is influenced by the earth surface gully, can complement the traditional evaluation method of the impact risk of the working surface, and achieves the aim of accurately preventing and controlling the rock burst.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for preventing and controlling risk of coal seam working face impact provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of the correspondence between a surface gully and a working surface according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the impact hazard zone division result of the coupled and overlapped I010206 working surface according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of a system for controlling risk of coal seam face impact according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
At present, the influence of the earth surface gully on the rock burst of the coal bed is relatively less, so that the evaluation and control before the earth surface gully induces the rock burst are relatively blank. The invention takes earth surface gullies and coal mine rock burst disasters as research objects, provides a coal seam working face impact risk prevention and control method and system based on the earth surface gullies, and aims to solve the problem that the earth surface gullies affect rock burst, firstly, the quantity and characteristics of the earth surface gullies in the whole mine range are counted according to an earth surface topography of a mining area, and the types of the earth surface gullies are divided; secondly, judging whether the coal bed is in the influence range of the gully; if the main control factors are within the influence range of the gully, identifying main control factors of the gully area on the earth surface, including fall, slope toe, width and included angle between the gully and the working surface; after determining the main control factors of the gullies, dividing the impact dangers of the working face; finally, according to the area division result of the impact risk, regional-local control measures are adopted, and after effect evaluation, the working surface passes through the surface valley area. The method is high in efficiency, economical, safe and targeted, can solve the problem that the rock burst is influenced by the earth surface gully, can complement the traditional evaluation method of the impact risk of the working surface, and achieves the aim of accurately preventing and controlling the rock burst. The method specifically comprises the following steps:
as shown in fig. 1 to 3, a method for preventing and controlling the risk of coal seam working face impact based on a surface ditch comprises the following steps:
s1, counting data of earth surface gullies in a range of a target mine; the method comprises the following steps of firstly, counting the number and characteristics of earth surface ditches in the whole mine range, dividing the types of the earth surface ditches, and specifically, the method comprises the following steps of:
s101, counting the number of surface ditches and the characteristics of the surface ditches in a target mine range, wherein the method specifically comprises the following steps:
the number and characteristics of the surface gutters with the drop height of more than 100 m are counted, wherein the characteristics of the surface gutters with the drop height of more than 100 m comprise: the drop height and the angle of the earth surface gully;
s102, dividing the types of the earth surface gullies according to the characteristics of the earth surface gullies, and specifically comprising the following steps: and classifying the earth surface gullies with the drop height more than 100 m according to the drop height and the angle of the earth surface gullies.
In one embodiment provided by the invention, as shown in fig. 2 and 3, three valley areas of the surface required to pass through in the mining process of the working face I010206 are counted, the fall of the valleys is 141 m, 157m and 281m in sequence, and the angles are 28 degrees, 26 degrees and 20 degrees in sequence.
S2, acquiring the drop impact dangerous grade of the coal bed according to the data of the earth surface ditch, and determining the coal bed under the influence of the earth surface ditch to acquire a target coal bed; the main purpose is to judge whether the coal seam is in the influence range of the gully, find the coal seam affected, regard the coal seam affected as the goal coal seam, if not affected, do not need to prevent and treat. The specific operation comprises the following steps:
calculating the drop of the working surface corresponding to the surface in the mining stage of the coal bed to obtain the drop impact dangerous grade of the coal bedKThe calculation rules of the drop impact risk level of the coal layer comprise:
when (when)3h≤HIn the time-course of which the first and second contact surfaces,K=W；
when (when)2h≤H＜3hIn the time-course of which the first and second contact surfaces,K=R；
when (when)0.5h≤H＜2hIn the time-course of which the first and second contact surfaces,K=Z；
when (when)0≤H＜0.5hIn the time-course of which the first and second contact surfaces,K=Q；
wherein ,Kin order to fall impact risk level,his the drop of the earth's surface gully,Hfor the depth of burial of the working surface,Win order to be of a no-impact risk class,Wthe value is 0;Rin order to be a weak impact hazard class,Rthe value is 0.25;Zin the middle impact risk level of the vehicle,Zthe value is 0.5;Qin order to be of a high impact risk level,Qthe value is 0.75;
screening the coal bed under the influence of the surface ditch according to the drop impact dangerous grade of the coal bed to obtain a target coal bed, wherein the coal bed under the influence of the surface ditchKThe values satisfy:K≥0.25。
that is, when the coal seam is at a drop impact hazard levelKAnd when the temperature is more than or equal to 0.25, calculating is needed, judging whether prevention and control are needed or not, and determining the affected coal bed as a target coal bed.
As shown in fig. 2 and 3, the maximum value of the valley drop is 281m, and the calculation rule of the drop impact risk level of the coal seam is obtained by substituting 281mKSince the B2 coal seam is a medium impact zone coal seam, the drop of the surface ditch is known to have an impact on the risk of B2 coal seam, which is 0.5.
S3, calculating data of other control factors when the working face of the target coal seam is in different mining stages, and obtaining impact risk levels of the working face of the target coal seam in different mining stages according to the drop impact risk levels and the data of other control factors, wherein the method specifically comprises the following steps:
calculating impact risk levels of other control factors of each surface ditch, wherein the other control factors of the surface ditches comprise ditch slope feet, ditch widths and ditch angles;
impact risk grade of gully toeLThe calculation rule of (1) includes:
when 0 is≤α＜20°In the time-course of which the first and second contact surfaces,L=W；
when (when)20°≤α＜40°In the time-course of which the first and second contact surfaces,L=R；
when (when)40°≤α＜60°In the time-course of which the first and second contact surfaces,L=Z；
when (when)40°≤αIn the time-course of which the first and second contact surfaces,L=Q；
wherein ,αis the gully toe;
impact risk rating of gully widthMThe calculation rule of (1) includes:
when 200≤dIn the time-course of which the first and second contact surfaces,M=W；
when (when)100≤d＜150In the time-course of which the first and second contact surfaces,M=R；
when (when)50≤d＜100In the time-course of which the first and second contact surfaces,M=Z；
when (when)0≤d＜50In the time-course of which the first and second contact surfaces,M=Q；
wherein ,dis the gully toe;
impact risk rating of gully angleNThe calculation rule of (1) includes:
when 200≤θIn the time-course of which the first and second contact surfaces,N=W；
when (when)100≤θ＜150In the time-course of which the first and second contact surfaces,N=R；
when (when)50≤θ＜100In the time-course of which the first and second contact surfaces,N=Z；
when (when)0≤θ＜50In the time-course of which the first and second contact surfaces,N=Q；
wherein ,θis the angle of the gully;
the level of risk of falling head impact is controlled according to the order of the numerical values from large to smallKIs the value of the impact risk level of the gully toeLImpact risk rating of number of gully widthMImpact risk rating of the number and gully angle of (2)NThe values of (2) are arranged;
determining a control factor corresponding to the maximum value as a main control factor of the working face of the target coal seam in the mining stage;
determining a control factor corresponding to the numerical value of the second position in the arrangement sequence as a secondary control factor of the working face of the target coal seam in the exploitation stage;
determining a control factor corresponding to the numerical value of the third position in the arrangement sequence as a third factor of the working face of the target coal seam in the exploitation stage;
determining a control factor corresponding to the numerical value of the fourth bit in the arrangement sequence as a fourth factor of the working face of the target coal seam in the mining stage;
and taking the impact risk level of the main control factor as the impact risk level of the working face of the target coal seam in the mining stage.
As shown in fig. 2 and 3, on the basis of determining that the B2 coal seam is influenced by the surface ditch, three parameters of the ditches are substituted into the impact danger level of the ditch slope toe in sequenceLIs a calculated rule of the impact risk level of the gully widthMIs used for calculating the impact risk level of rules and gully anglesNThe calculation rules of (1) include data for each of valleys 1, 2, and 3, K, L, M, N, wherein:
valley 1: k=0.25, l=0.25, m=0.25, n=0.5,
valley 2: k=0.25, l=0.25, m=0.25, n=0.25,
valley 3: k=0.75, l=0.25, m=0.25, n=0.25.
And respectively arranging the data to obtain a main control factor.
S4, coupling the drop impact risk level of the target coal seam and the impact risk level of the target coal seam in different mining stages to obtain the impact risk level in the area where the surface gully is located; the method specifically comprises the following steps:
the calculation formula for coupling the drop impact risk level of the target coal seam and the mining stage impact risk level of the target coal seam is shown as formula (1):
wherein ,λ 1 、λ 2 、λ 3 、λ 4 as a result of the coupling coefficient,λ 1 0.5 part,λ 2 Is 0.4 part,λ 3 Is 0.1 andλ 4 is 0, wherein,λ 1 the coupling coefficient representing the master factor,λ 2 representing the coupling coefficient of the secondary master factor,λ 3 the coupling coefficient representing the third factor is,λ 4 the coupling coefficient representing the fourth factor,Ois the coupling impact danger value;
impact risk level in the area of earth's surface gullyPThe calculation rule of (1) includes:
when 0 is≤O＜0.25In the time-course of which the first and second contact surfaces,P=W；
when 0.25≤O＜0.5In the time-course of which the first and second contact surfaces,P=R；
when 0.5≤O＜0.75In the time-course of which the first and second contact surfaces,P=Z；
when (when)0.75≤OIn the time-course of which the first and second contact surfaces,P=Q。
preferably, according to the impact danger level in the area of the surface ditch, the method adopts the adaptive control means according to the type of the working face of the target coal seam, and comprises the following steps:
classifying working surfaces of the target coal seam, wherein the working surfaces of the target coal seam comprise working surfaces in planning and designing and working surfaces in production;
according to the working surface in the planning and design and the impact danger level in the area of the corresponding earth surface gully, regional control is carried out on the working surface in the planning and design;
and carrying out regional control on the working surface in production according to the impact danger level in the region of the earth surface gully corresponding to the working surface in production.
As shown in FIGS. 2 and 3, the K, L, M, N parameters of the three valleys obtained in S3 are sequentially substituted into the equation (1) and the impact risk level in the area where the surface gulliesPIn the calculation rule of (1), the value of the obtainable valley (1) is 0.375, which is a weak impact dangerous area, and the influence range is 0-321 m. The value of the valley 2 is 0.5, which is a medium impact dangerous area, and the influence range is 842-1400 m, wherein the valley is particularly dangerous in the entering stage and the exiting stage of the valley, and therefore, the valley is a strong impact dangerous area in the 792-992 m of the entering stage and 1350-1450 m of the exiting stage. The value 3 of the valley is 0.25, and is a weak impact dangerous area, and the influence range is 1455-1701 m.
The above-mentioned impact dangerous zone division result is coupled with the impact dangerous zone division result of the original I010206 working surface, and two strong impact dangerous zones are added, and the two zones are respectively shown as (8) and (9) high impact dangerous zones in figure 3, so that they should be controlled according to the strong impact dangerous zones.
S5, adopting an adaptive control means according to the impact risk level in the area of the surface ditch and combining the type of the working face of the target coal seam, wherein the method specifically comprises the following steps:
when no impact danger level exists, regional control is not performed;
in the case of a weak impact risk level or a medium impact risk level, the method for regional control comprises: changing the arrangement mode of the working surface, reducing the frequency of the ascending stage and increasing the length of the trench bottom stage;
in the case of a strong impact hazard class, the method for regional control comprises: changing the arrangement mode of the working face, reducing the number of ascending stages, increasing the length of the trench bottom stage and filling and mining the working face.
The impact risk level in the area where the working surface being produced is jointed with the corresponding earth surface gully, and the regional control of the working surface being produced comprises:
when no impact danger level exists, regional control is not performed;
in the case of a weak impact risk level or a medium impact risk level, the method for regional control comprises: weakening the top plate, changing the mining speed and releasing pressure of coal seam drilling;
in the case of a strong impact hazard class, the method for regional control comprises: weakening the roof, changing the mining speed, drilling and releasing the pressure of the coal seam and filling and mining the working face.
Regional control measures and local control measures based on the influence of surface ditches are specifically as follows, firstly, the types of working surfaces are divided into two types of working surfaces in planning design and working surfaces in production. Subsequently, different regional-regional control measures are taken, depending on the type of working surface. Regional control measures for changing the arrangement mode of the working face can be adopted aiming at the working face in planning and design, so that the number of ascending stages of the working face and the width of the working face passing through the ditch bottom are reduced, and impact induced by superposition of various factors is avoided. Local control methods for weakening the top plate and changing the propelling speed can be adopted for the working face under exploitation, so that impact induced by multi-factor coupling is avoided. When a strong impact dangerous area is encountered, a working face filling mining method can be adopted for mining.
As shown in fig. 3, for the areas (7) and (8) of the strong impact danger areas in fig. 3, the control is carried out by adopting a method of combining roof blasting and directional long drilling, the blasting interval is encrypted to be 10 m groups by conventional 20 m, and the sanding water jet interval is encrypted to be 5 m groups by 10 m.
The method makes up for the blank of prevention and control before rock burst is induced by the earth surface gully. Counting the number and characteristics of earth surface gullies in the whole mine range according to the earth surface topography of the mining area, and dividing the types of the earth surface gullies; secondly, judging whether the coal bed is in the influence range of the gully; if the main control factors are within the influence range of the gully, identifying main control factors of the gully area on the earth surface, including fall, slope toe, width and included angle between the gully and the working surface; after determining the main control factors of the gullies, dividing the impact dangers of the working face; finally, according to the area division result of the impact risk, regional-local control measures are adopted, and after effect evaluation, the working surface passes through the surface valley area. The method has the advantages of high efficiency, economy, safety and pertinence, can solve the problem that the rock burst is influenced by the earth surface gully, can complement the traditional evaluation method of the impact risk of the working surface, and achieves the aim of accurately preventing and controlling the rock burst.
As shown in fig. 4, an embodiment of the present invention provides a system for realizing the risk of coal seam face impact based on a surface ditch, which includes:
the statistics module 100 is used for counting data of earth surface gullies in the range of the target mine;
the screening module 200 is used for obtaining the drop impact dangerous grade of the coal bed according to the data of the surface ditch, determining the coal bed under the influence of the surface ditch, and obtaining a target coal bed;
the calculation module 300 is configured to calculate data of other control factors when the working surface of the target coal seam is in different mining stages, and obtain impact risk levels of the working surface of the target coal seam in different mining stages according to the drop impact risk levels and the data of other control factors;
the coupling module 400 is used for coupling the drop impact risk level of the target coal seam and impact risk levels of different mining stages of the target coal seam to obtain the impact risk level in the area where the surface gully is located;
the control module 500 is used for adopting an adaptive control means according to the impact danger level in the area of the surface ditch and the type of the working face of the target coal seam.
According to the method, the influence of the earth surface gully on the rock burst of the coal seam can be fully considered, the pre-evaluation is performed in advance, the defect that the influence of the earth surface gully is not considered in the traditional impact risk evaluation method is overcome, and the accurate pre-evaluation can be achieved. And taking regional-local pressure relief measures in advance in the impact dangerous area to realize safe production of the mine.
The invention makes up for the blank of prevention and control before rock burst is induced by the earth surface gully. According to the invention, the quantity and the characteristics of the earth surface gullies in the whole mine range are counted according to the earth surface topography of the mining area, and the types of the earth surface gullies are divided; secondly, judging whether the coal bed is in the influence range of the gully; if the main control factors are within the influence range of the gully, identifying main control factors of the gully area on the earth surface, including fall, slope toe, width and included angle between the gully and the working surface; after determining the main control factors of the gullies, dividing the impact dangers of the working face; finally, according to the area division result of the impact risk, regional-local control measures are adopted, and after effect evaluation, the working surface passes through the surface valley area. The method has the advantages of high efficiency, economy, safety and pertinence, can solve the problem that the rock burst is influenced by the earth surface gully, can complement the traditional evaluation method of the impact risk of the working surface, and achieves the aim of accurately preventing and controlling the rock burst.
Fig. 5 is a schematic structural diagram of an electronic device 600 according to an embodiment of the present invention, where the electronic device 600 may have a relatively large difference due to different configurations or performances, and may include one or more processors (central processing units, CPU) 610 and one or more memories 620, where at least one instruction is stored in the memories 620, and the at least one instruction is loaded and executed by the processors 610 to implement the steps of the above-mentioned method for preventing and treating a risk of impact on a coal seam working surface based on a surface ditch.
In an exemplary embodiment, a computer readable storage medium, such as a memory including instructions executable by a processor in a terminal to perform the above-described method of controlling a coal seam face impact hazard based on a surface ditch, is also provided. For example, the computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.
The above embodiments are not limited to the technical solution of the embodiments, and the embodiments may be combined with each other to form a new embodiment. The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and any modifications or equivalent substitutions without departing from the spirit and scope of the present invention should be covered in the scope of the technical solution of the present invention.
Claims (7)
1. The method for preventing and controlling the impact danger of the coal seam working face based on the surface ditch is characterized by comprising the following steps of:
s1, counting data of earth surface gullies in a range of a target mine;
s2, acquiring the drop impact risk grade of the coal bed according to the data of the surface ditch, and determining the coal bed under the influence of the surface ditch to acquire a target coal bed;
s3, calculating data of other control factors of the working face of the target coal seam in different mining stages, and obtaining impact risk levels of the working face of the target coal seam in different mining stages according to the drop impact risk levels and the data of the other control factors;
s4, coupling the drop impact risk level of the target coal seam and the impact risk level of the target coal seam in different mining stages to obtain the impact risk level in the area where the surface gully is located;
s5, adopting an adaptive control means according to the impact risk level in the area of the surface gully and the type of the working face of the target coal seam;
the step S2 of obtaining the drop impact risk level of the coal bed according to the data of the surface ditch, and determining the coal bed under the influence of the surface ditch, wherein the step S of obtaining the target coal bed comprises the following steps:
calculating the drop of the working surface corresponding to the mining stage of the coal bed to obtain the drop impact dangerous grade of the coal bedKThe calculation rule of the drop impact risk level of the coal seam comprises the following steps:
when (when)3h≤HIn the time-course of which the first and second contact surfaces,K=W；
when (when)2h≤H＜3hIn the time-course of which the first and second contact surfaces,K=R；
when (when)0.5h≤H＜2hIn the time-course of which the first and second contact surfaces,K=Z；
when (when)0≤H＜0.5hIn the time-course of which the first and second contact surfaces,K=Q；
wherein ,Kin order to fall impact risk level,his the drop of the earth's surface gully,Hfor the depth of burial of the working surface,Win order to be of a no-impact risk class,Wthe value is 0;Rin order to be a weak impact hazard class,Rthe value is 0.25;Zin the middle impact risk level of the vehicle,Zthe value is 0.5;Qin order to be of a high impact risk level,Qthe value is 0.75;
screening the coal bed affected by the surface ditch according to the drop impact risk level of the coal bed to obtain a target coal bed, wherein the coal bed affected by the surface ditchKThe values satisfy:K≥0.25；
and S3, calculating data of other control factors of the working face of the target coal seam in different mining stages, and obtaining the impact risk level of the working face of the target coal seam in different mining stages according to the drop impact risk level and the data of the other control factors, wherein the data comprises the following steps:
calculating impact risk levels of other control factors of each surface ditch, wherein the other control factors of the surface ditches comprise ditch slope feet, ditch widths and ditch angles;
impact risk level of the gully toeLThe calculation rule of (1) includes:
when 0 is≤α＜20°In the time-course of which the first and second contact surfaces,L=W；
when (when)20°≤α＜40°In the time-course of which the first and second contact surfaces,L=R；
when (when)40°≤α＜60°In the time-course of which the first and second contact surfaces,L=Z；
when (when)60°≤αIn the time-course of which the first and second contact surfaces,L=Q；
wherein ,αis the gully toe;
impact hazard rating of the gully widthMThe calculation rule of (1) includes:
when 200m≤dIn the time-course of which the first and second contact surfaces,M=W；
when (when)100m≤d＜150mIn the time-course of which the first and second contact surfaces,M=R；
when (when)50m≤d＜100mIn the time-course of which the first and second contact surfaces,M=Z；
when (when)0m≤d＜50mIn the time-course of which the first and second contact surfaces,M=Q；
wherein ,dis the width of the gully;
impact risk level of the gully angleNThe calculation rule of (1) includes:
when 200 °≤θIn the time-course of which the first and second contact surfaces,N=W；
when (when)100°≤θ＜150In the case of a degree of the degree,N=R；
when (when)50°≤θ＜100In the case of a degree of the degree,N=Z；
when (when)0°≤θ＜50In the case of a degree of the degree,N=Q；
wherein ,θis the angle of the gully;
the level of risk of falling head impact is controlled according to the order of the numerical values from large to smallKIs the value of the impact risk level of the gully toeLImpact risk rating of number of gully widthMImpact risk rating of the number and gully angle of (2)NThe values of (2) are arranged;
determining a control factor corresponding to the maximum value as a main control factor of the working face of the target coal seam in the mining stage;
determining a control factor corresponding to the numerical value of the second position in the arrangement sequence as a secondary control factor of the working face of the target coal seam in the exploitation stage;
determining a control factor corresponding to the numerical value of the third position in the arrangement sequence as a third factor of the working face of the target coal seam in the exploitation stage;
determining a control factor corresponding to the numerical value of the fourth bit of the arrangement sequence as a fourth factor of the working face of the target coal seam in the mining stage;
and taking the impact risk level of the main control factor as the impact risk level of the working face of the target coal seam in the mining stage.
2. The method for preventing and controlling the risk of coal seam working face impact based on the surface ditch according to claim 1, wherein the data of the surface ditch in the range of the statistical target mine of S1 comprises:
s101, counting the number of earth surface ditches and the characteristics of the earth surface ditches in a target mine range;
s102, dividing the types of the surface ditches according to the number of the surface ditches and the characteristics of the surface ditches.
3. The method for preventing and controlling the risk of coal seam working face impact based on surface ditches according to claim 2, wherein the statistics of the number of surface ditches and the characteristics of the surface ditches in the range of the statistical target mine of S101 include:
the number and characteristics of the surface gullies with the drop height of more than 100 m are counted, wherein the characteristics of the surface gullies with the drop height of more than 100 m comprise: the drop height and the angle of the earth surface gully;
the step S102 of dividing the types of the surface ditches according to the number of the surface ditches and the characteristics of the surface ditches comprises the following steps:
and classifying the earth surface gullies with the drop height more than 100 m according to the drop height and the angle of the earth surface gullies.
4. The method for preventing and controlling the impact risk of the coal seam working face based on the surface ditch according to claim 1, wherein the method for preventing and controlling the impact risk comprises the following steps of:
classifying the working surfaces of the target coal seam, wherein the working surfaces of the target coal seam comprise working surfaces in planning and designing and working surfaces in production;
according to the impact danger level in the area where the surface gully corresponding to the working face in the planning design is located, regional control is carried out on the working face in the planning design;
and carrying out regional control on the working surface under production according to the impact danger level in the region of the earth surface gully corresponding to the working surface under production.
5. A method of controlling risk of coal seam face impact based on a surface ditch as claimed in claim 4, wherein the rules for regional control of the face in the planned design include:
when no impact danger level exists, regional control is not performed;
in the case of a weak impact risk level or a medium impact risk level, the method for regional control comprises: changing the arrangement mode of the working surface, reducing the frequency of the ascending stage and increasing the length of the trench bottom stage;
in the case of a strong impact hazard class, the method for regional control comprises: changing the arrangement mode of the working face, reducing the number of ascending stages, increasing the length of the trench bottom stage and filling and mining the working face.
6. The method for preventing and controlling the risk of impact on a coal seam working surface based on a surface ditch according to claim 4, wherein the step of performing regional prevention and control on the working surface being produced according to the impact risk level in the region of the surface ditch corresponding to the working surface being produced comprises the steps of:
when no impact danger level exists, regional control is not performed;
in the case of a weak impact risk level or a medium impact risk level, the method for regional control comprises: weakening the top plate, changing the mining speed and releasing pressure of coal seam drilling;
in the case of a strong impact hazard class, the method for regional control comprises: weakening the roof, changing the mining speed, drilling and releasing the pressure of the coal seam and filling and mining the working face.
7. A system for controlling risk of coal seam face impact based on a surface ditch, comprising:
the statistics module is used for counting data of earth surface gullies in the range of the target mine;
the screening module is used for obtaining the drop impact dangerous grade of the coal bed according to the data of the surface ditch, determining the coal bed under the influence of the surface ditch and obtaining a target coal bed;
the calculation module is used for calculating data of other control factors of the working face of the target coal seam in different mining stages, and obtaining impact risk levels of the working face of the target coal seam in different mining stages according to the drop impact risk levels and the data of the other control factors;
the coupling module is used for coupling the drop impact dangerous grade of the target coal seam and impact dangerous grades of different mining stages of the target coal seam to obtain the impact dangerous grade in the area where the surface gully is located;
the control module is used for adopting an adaptive control means according to the impact risk level in the area where the surface ditch is located and the type of the working face of the target coal seam;
the step of obtaining the drop impact risk level of the coal bed according to the data of the surface ditch, and determining the coal bed under the influence of the surface ditch, wherein the step of obtaining the target coal bed comprises the following steps:
calculating the drop of the working surface corresponding to the mining stage of the coal bed to obtain the drop impact dangerous grade of the coal bedKThe calculation rule of the drop impact risk level of the coal seam comprises the following steps:
when (when)3h≤HIn the time-course of which the first and second contact surfaces,K=W；
when (when)2h≤H＜3hIn the time-course of which the first and second contact surfaces,K=R；
when (when)0.5h≤H＜2hIn the time-course of which the first and second contact surfaces,K=Z；
when (when)0≤H＜0.5hIn the time-course of which the first and second contact surfaces,K=Q；
wherein ,Kin order to fall impact risk level,his the drop of the earth's surface gully,Hfor the depth of burial of the working surface,Win order to be of a no-impact risk class,Wthe value is 0;Rin order to be a weak impact hazard class,Rthe value is 0.25;Zin the middle impact risk level of the vehicle,Zthe value is 0.5;Qin order to be of a high impact risk level,Qthe value is 0.75;
screening the coal bed affected by the surface ditch according to the drop impact risk level of the coal bed to obtain a target coal bed, wherein the coal bed affected by the surface ditchKThe values satisfy:K≥0.25；
calculating data of other control factors of the working face of the target coal seam in different mining stages, and obtaining the impact risk level of the working face of the target coal seam in different mining stages according to the drop impact risk level and the data of the other control factors, wherein the method comprises the following steps:
calculating impact risk levels of other control factors of each surface ditch, wherein the other control factors of the surface ditches comprise ditch slope feet, ditch widths and ditch angles;
impact risk level of the gully toeLThe calculation rule of (1) includes:
when 0 is≤α＜20°In the time-course of which the first and second contact surfaces,L=W；
when (when)20°≤α＜40°In the time-course of which the first and second contact surfaces,L=R；
when (when)40°≤α＜60°In the time-course of which the first and second contact surfaces,L=Z；
when (when)60°≤αIn the time-course of which the first and second contact surfaces,L=Q；
wherein ,αis the gully toe;
impact hazard rating of the gully widthMThe calculation rule of (1) includes:
when 200m≤dIn the time-course of which the first and second contact surfaces,M=W；
when (when)100m≤d＜150mIn the time-course of which the first and second contact surfaces,M=R；
when (when)50m≤d＜100mIn the time-course of which the first and second contact surfaces,M=Z；
when (when)0m≤d＜50mIn the time-course of which the first and second contact surfaces,M=Q；
wherein ,dis the width of the gully;
impact risk level of the gully angleNThe calculation rule of (1) includes:
when 200 °≤θIn the time-course of which the first and second contact surfaces,N=W；
when (when)100°≤θ＜150In the case of a degree of the degree,N=R；
when (when)50°≤θ＜100In the case of a degree of the degree,N=Z；
when (when)0°≤θ＜50In the case of a degree of the degree,N=Q；
wherein ,θis the angle of the gully;
the level of risk of falling head impact is controlled according to the order of the numerical values from large to smallKIs the value of the impact risk level of the gully toeLImpact risk rating of number of gully widthMImpact risk rating of the number and gully angle of (2)NThe values of (2) are arranged;
determining a control factor corresponding to the maximum value as a main control factor of the working face of the target coal seam in the mining stage;
determining a control factor corresponding to the numerical value of the second position in the arrangement sequence as a secondary control factor of the working face of the target coal seam in the exploitation stage;
determining a control factor corresponding to the numerical value of the third position in the arrangement sequence as a third factor of the working face of the target coal seam in the exploitation stage;
determining a control factor corresponding to the numerical value of the fourth bit of the arrangement sequence as a fourth factor of the working face of the target coal seam in the mining stage;
and taking the impact risk level of the main control factor as the impact risk level of the working face of the target coal seam in the mining stage.
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| CN109635387B (en) * | 2018-11-29 | 2023-01-03 | 中国矿业大学 | Method for obtaining deformation law of mining slope body in gully development mining area |
| CN109767136A (en) * | 2019-01-17 | 2019-05-17 | 内蒙古上海庙矿业有限责任公司 | Roof water-bearing layer water fathering hazard assessment and the duplexing practice of prediction four |
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| CN103244179A (en) * | 2013-04-28 | 2013-08-14 | 中国矿业大学 | Evaluation method for predicting coal mine underground impact mine pressure danger |
| CN105589104A (en) * | 2015-12-16 | 2016-05-18 | 辽宁工程技术大学 | Method for determining influence of fracture structure on rock burst |
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