CN113482718A - Method for preventing rock burst through pressure relief arrangement of roadway group of coal seam panel - Google Patents
Method for preventing rock burst through pressure relief arrangement of roadway group of coal seam panel Download PDFInfo
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- CN113482718A CN113482718A CN202110927396.4A CN202110927396A CN113482718A CN 113482718 A CN113482718 A CN 113482718A CN 202110927396 A CN202110927396 A CN 202110927396A CN 113482718 A CN113482718 A CN 113482718A
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- 239000003245 coal Substances 0.000 title claims abstract description 154
- 239000011435 rock Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005065 mining Methods 0.000 claims abstract description 101
- 230000005641 tunneling Effects 0.000 claims description 8
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 7
- 230000001939 inductive effect Effects 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
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- E21F17/18—Special adaptations of signalling or alarm devices
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Abstract
The invention provides a method for preventing rock burst by pressure relief arrangement of a roadway group of a coal bed panel area, which comprises the following steps: determining mining parameters of a coal seam roof layered mining working face based on the specification parameters of the roadway of the panel to be tunneled; according to mining parameters of a coal seam top layered mining working face, a coal seam top is mined and layered to form a top layered goaf; and excavating a plurality of panel area roadways which accord with the specification parameters of the panel area roadway to be excavated below the top layered goaf after a preset time period, wherein the panel area roadways form a panel area roadway group. A top layered goaf is formed by exploiting a coal seam top layer in advance, and the top layer is utilized to protect the coal seam bottom layer, so that the coal seam bottom layer is in a stress reduction area.
Description
Technical Field
The invention relates to the technical field of coal mine safety mining, in particular to a method for preventing rock burst through pressure relief arrangement of a roadway group of a coal bed panel.
Background
The coal mine panel roadway is usually arranged in a coal seam, aiming at an extra-thick coal seam, the panel roadway is arranged in the middle of the coal seam, thick top and bottom coals are reserved, impact risks are increased, resource waste is caused, unreasonable roadway coal pillar width, centralized arrangement of a connecting roadway and a chamber, stoping disturbance at the last mining stage of two wing working faces and other factors cause concentrated rock stress of surrounding rock in a panel roadway group area, for example, the concentrated static load level after the panel roadway is excavated is higher, the last mining stage of two wing working faces of the panel roadway is influenced by a top plate cantilever, dynamic and static loads are superposed, critical impact loads are easily broken through, and therefore, a threshold for generating rock burst is obviously reduced, the impact risk is obviously improved, the rock burst is easily induced, and the disaster form is severe.
The protective pillars of the panel lanes a of the conventional panel lane group in fig. 1a and 1b are set to 150m, the goaf b after the recovery of the two-wing working face, and the lateral support pressure curve of the conventional panel lane group, e.g., the first support pressure curve σ1Second support pressure curve sigma2Are all in high position and are close to the critical impact load sigma inducing impact initiationcAnd rock burst is easy to occur.
Disclosure of Invention
In view of the above problems, the present invention is proposed to provide a method for preventing and controlling rock burst by pressure relief arrangement of a roadway group of a coal seam panel, which overcomes or at least partially solves the above problems, and can enable surrounding rocks near the roadway group of the panel to be in a low stress state, and roadways of the panel to be in a stress reduction area during tunneling and use, so that dynamic and static load sources inducing the start of rock burst are reduced, a rock burst occurrence threshold is improved, and the risk degree of rock burst is greatly reduced.
According to an aspect of the embodiment of the invention, a method for preventing rock burst by pressure relief arrangement of a roadway group of a coal bed panel area is provided, and the method comprises the following steps:
determining mining parameters of a coal seam roof layered mining working face based on the specification parameters of the roadway of the panel to be tunneled;
mining the top of the coal seam in a coal seam to layer according to the mining parameters of the top layered mining working face of the coal seam to form a top layered goaf;
and excavating a plurality of panel area roadways which accord with the specification parameters of the panel area roadway to be excavated below the top layered goaf after a preset time period, wherein the panel area roadways form a panel area roadway group.
Optionally, the specification parameters of the to-be-tunneled panel roadway include the height, width, number, arrangement interval and the empty protection coal pillar width of the to-be-tunneled panel roadway, and the mining parameters of the coal seam roof layered mining working face are determined based on the specification parameters of the to-be-tunneled panel roadway, including:
determining the height of a coal seam top layered mining working surface based on the height of the panel roadway to be tunneled and the total coal seam thickness, wherein the sum of the height of the coal seam top layered mining working surface and the height of the panel roadway to be tunneled is not more than the total coal seam thickness;
determining the total width of the panel roadway group based on the roadway width, the number, the arrangement interval and the adjacent empty protection coal pillar width of the panel roadway to be tunneled;
and setting the width of the coal seam top layered mining working face to be a width value larger than the total width of the panel roadway group.
Optionally, before the coal seam mining the top of the coal seam to form a top stratified goaf according to the mining parameters of the top stratified mining working face of the coal seam, the method further includes: determining a coal seam area of the coal seam top layer to be mined according to mining parameters of the coal seam top layer mining working face, and respectively arranging top layer mining roadways on two sides of the coal seam area of the coal seam top layer to be mined;
mining the top of the coal seam in a layered manner according to the mining parameters of the top layered mining working face of the coal seam to form a top layered goaf, and the method comprises the following steps: and mining the top of the coal seam in a coal seam by layering according to the mining parameters of the top layered mining working face of the coal seam to form a top layered goaf.
Optionally, mining the top of the coal seam in a coal seam to form a top stratified goaf according to the mining parameters of the top stratified mining face of the coal seam, including:
and mining the coal seam roof layering by adopting a fully mechanized top coal caving method according to the mining parameters of the coal seam roof layering mining working face to form a roof layering goaf.
Optionally, the adjacent empty protection pillars on both wings of the panel roadway group are located between the two top layered mining roadways in the horizontal direction.
Optionally, after a preset time period, a plurality of panel area roadways meeting the specification parameters of the panel area roadway to be tunneled are tunneled below the top layered gob, including:
and tunneling a plurality of panel area roadways which accord with the specification parameters of the panel area roadway to be tunneled at preset intervals below the top layered gob.
Optionally, the preset time period is not less than a time period required for a top stratified goaf stabilization period.
According to the embodiment of the invention, the top layering goaf is formed by mining the top layering of the coal seam in advance, the top layering is utilized to protect the lower layering of the coal seam, so that the lower layering of the coal seam is in the stress reduction area, after the panel area roadway group is arranged below the top layering goaf, the near-field surrounding rock of the panel area roadway group can be in a low-stress state, the panel area roadway is in the stress reduction area during tunneling and using, namely in a protected state, a dynamic and static load source inducing rock burst starting is reduced, a rock burst occurrence threshold is improved, and the rock burst risk degree is greatly reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1a and 1b respectively show different angle schematic diagrams of the roadway group arrangement structure of the existing coal seam panel;
fig. 2 is a schematic flow chart illustrating a method for controlling rock burst by pressure relief arrangement of roadway groups in a coal seam panel according to an embodiment of the invention;
figure 3a shows a schematic view of an angle of a coalbed methane zone roadway group arrangement according to an embodiment of the present invention;
figure 3b shows a schematic view of an angle of a coalbed methane zone roadway group arrangement according to another embodiment of the present invention;
a: panel lanes of a traditional panel lane group; b, reclaiming the mined-out area on the working surfaces of the two wings; sigma1: a first bearing pressure curve; sigma2: a second bearing pressure curve; σ c: critical impact load; 1: a panel roadway; 2: top layering stoping the roadway; 3: goaf on two wings of panel roadway group; 4: a top layered gob; sigma1Third bearing pressure curve; sigma2' of: a fourth bearing pressure curve.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In order to solve the above technical problems, an embodiment of the present invention provides a method for preventing and treating rock burst through pressure relief arrangement of a roadway group of a coal seam panel, and fig. 2 shows a schematic flow chart of the method for preventing and treating rock burst through pressure relief arrangement of the roadway group of the coal seam panel according to an embodiment of the present invention. Referring to fig. 2, the method for preventing rock burst by coal-seam-panel roadway group pressure relief arrangement comprises steps S102 to S106.
And S102, determining mining parameters of the coal seam roof layered mining working face based on the specification parameters of the roadway of the panel to be tunneled.
And S104, layering the top of the coal seam mining layer in the coal seam according to the mining parameters of the coal seam top layered mining working face to form a top layered goaf.
And S106, tunneling a plurality of panel area roadways which accord with the specification parameters of the panel area roadway to be tunneled below the top layered goaf after a preset time period, wherein the panel area roadways form a panel area roadway group.
According to the embodiment of the invention, the top layering goaf is formed by mining the top layering of the coal seam in advance, the top layering is utilized to protect the lower layering of the coal seam, so that the lower layering of the coal seam is in the stress reduction area, after the panel area roadway group is arranged below the top layering goaf, the near-field surrounding rock of the panel area roadway group can be in a low-stress state, the panel area roadway is in the stress reduction area during tunneling and using, namely in a protected state, a dynamic and static load source inducing rock burst starting is reduced, a rock burst occurrence threshold is improved, and the rock burst risk degree is greatly reduced.
In an embodiment of the invention, the specification parameters of the zone roadway to be tunneled may include the height, width, number, arrangement interval and the width of the adjacent empty protection coal pillar of the zone roadway to be tunneled. The specification parameters of the roadway of the panel to be tunneled are designed in advance. For example, the thickness of the main mining coal seam is 20m, the height of the panel roadway to be excavated can be set to be 3.5m, the width of the panel roadway to be excavated is set to be 5.4m, the arrangement interval is set to be 35m, the panel roadway group shown in fig. 3a and 3b comprises three panel roadways, and the width of the adjacent empty protection coal pillar is 70 m. The distance of the arrangement intervals of the panel lanes in this embodiment is the width of the reserved inter-lane coal pillars of the panel lanes. In order to meet the requirement of coal seam anti-impact, the coal pillars among the panel roadways are arranged to be wide coal pillars.
The specification parameters of the roadway of the panel to be tunneled can be adjusted according to the specification of the actual main coal seam, and the embodiment of the invention is not particularly limited to this. The mining parameters of the coal seam roof stratified mining face may include parameters such as height, width, length, etc. of the coal seam roof stratified mining face.
Referring to step S102, when determining mining parameters of the coal seam roof layered mining face based on the specification parameters of the panel roadway to be tunneled, the height of the coal seam roof layered mining face may be determined based on the height of the panel roadway to be tunneled and the total coal seam thickness, and the sum of the height of the coal seam roof layered mining face and the height of the panel roadway to be tunneled does not exceed the total coal seam thickness. In the embodiment of the invention, in the process of determining the height of the coal seam top layered mining working face based on the height of the roadway of the panel to be tunneled and the total coal seam thickness, the coal seam top layered height and the lower layered height can be kept to meet the condition of arranging the fully mechanized caving working face, and the height of the fully mechanized caving working face is not less than 6m generally. The height of the coal seam roof layered mining working face of the embodiment of the invention can be 6 m.
And then, determining the total width of the panel roadway group based on the roadway width, the number, the arrangement interval and the adjacent empty protection coal pillar width of the panel roadway to be tunneled. And further setting the width of the coal seam top layered mining working face to be larger than the width value of the total width of the panel roadway group.
For example, referring to fig. 3a, the width of the lane of the panel lane 1 is 5.4m, the arrangement interval is 35m, and the width of the adjacent space protection coal pillar is 70m, so that the total width of the panel lane group consisting of the three panel lanes 1 is about 3 × 5.4m +2 × 35m +70 × 2 ═ 226.2 m. Then, the width of the coal seam roof stratified mining face may be set to 230m, but may be set to other width values.
The width of working face is greater than the total width of panel tunnel crowd through setting up coal seam roof layering mining face, can effectively guarantee the coal seam roof layering mining back, panel tunnel 1 all is in under top layering collecting space area 4 to all be in stress reduction district during making panel tunnel 1 tunnel to tunnel and use, reduce and strike dangerous degree.
The specification parameters of the panel roadway to be tunneled in the embodiment of the invention can also include the roadway length, and the propelling length of the coal seam top layered mining working face is similar to the length of the panel roadway to be tunneled below, for example, the planned length of the panel roadway is 2500m, so the propelling length of the top layered mining working face can also be 2500 m.
Referring to fig. 3a and 3b, in an embodiment of the present invention, before the step S104 is executed to layer the top of the mined coal seam according to the mining parameters of the top of the mined coal seam to form the top-layer mined area 4, the coal seam area of the top layer of the mined coal seam to be mined is determined according to the mining parameters of the top-layer mining work, and top-layer mining roadways 2 are respectively arranged on two sides of the coal seam area of the top layer of the mined coal seam to be mined. For example, the coal seam top stratified area may be roughly determined according to the parameters such as height and width of the coal seam top stratified mining working face determined above, so as to set the top stratified stoping roadway 2 according to the corresponding area. Then, when step S104 is executed, the top of the coal seam mining coal seam may be stratified directly through the top stratified stoping roadway 2 and according to mining parameters of the top of the coal seam mining working face to form a top stratified goaf 4. Therefore, the two top layered stoping roadways 2 can realize the layered stoping of the whole coal seam top and form a goaf.
In an embodiment of the present invention, when the top layer of the coal seam is layered to form the top layered gob 4 according to the mining parameters of the top layered mining face of the coal seam in the step S104, the top layer of the coal seam may be layered to form the top layered gob 4 by using a fully mechanized top coal mining method. The embodiment of the invention adopts a fully-mechanized top coal caving method of top coal caving instead of one-time mining full height, and can effectively reduce the impact risk during the top layer mining of the coal seam.
In the embodiment of the invention, a coal face can be arranged along the bottom of a coal bed within a certain thickness range in the process of the top coal caving mining method, then the mining is carried out in a comprehensive mechanical mode, and the top coal is crushed into discrete bodies by utilizing the action of mine pressure or assisting methods such as loose blasting and the like, and then the top coal is transported out of the coal face by a scraper conveyer.
With continued reference to fig. 3a and 3b, in an embodiment of the present invention, the adjacent empty protection pillars on both sides of the panel roadway group are located between the two top stratified stoping roadways 2 in the horizontal direction. Namely, the two sides of the layered coal seam top cover panel roadway groups and two sides face empty protection coal pillars.
For example, the two sides of the coal seam top layer cover the two sides of the panel roadway group by 80m, the adjacent empty protection coal pillars of the panel roadway 1 are set to be 70m, the stope positions of the stope working faces at the two wings of the panel roadway group enter the inner side of the top layer goaf 4 by 10m, and if the goafs 3 at the two wings of the panel roadway group enter the inner side of the top layer goaf 4 by 10 m. The embodiment of the invention reduces the width of the temporary empty protective coal pillar as much as possible under the condition of ensuring safety, thereby increasing the quantity of the mined coal and improving the resource recovery utilization rate.
In addition, the length of the stope face of the two wings of the panel roadway group is 200m, and the width of the section coal pillar between the goafs 3 of the two wings of the panel roadway group is 6 m.
In the embodiment of the invention, as shown in fig. 3a, after the top layered gob 4 is mined, the roadway group of the panel area is tunneled below the top layered gob 4, so that the effect of reducing the stress concentration degree can be achieved, and the effect of preventing and treating rock burst can be achieved.
Referring to step S106, in an embodiment of the present invention, in the process of tunneling a plurality of panel lanes 1 meeting the specification parameters of the panel lanes to be tunneled below the top-stratified goaf 4 after a preset time period, the plurality of panel lanes 1 and the top-stratified goaf 4 keep a preset distance apart. For example, the excavated panel lanes are spaced 8m from the top stratified gob 4. Set up certain distance interval between panel tunnel 1 and top layering collecting space 4, can guarantee to leave the top coal of certain thickness above panel tunnel 1 to guarantee the safe construction in panel tunnel 1.
Optionally, the preset time period of the embodiment of the present invention is not less than the time period required for the stabilization period of the top stratified goaf 4. For example, after 6 months the coal seam roof stratified goaf 4 becomes progressively more stable, and multiple panel roadways 1 may be tunneled at a predetermined distance below the roof stratified goaf 4.
According to the embodiment of the invention, the top layered goaf 4 is formed by performing the layered mining on the coal seam top of the panel roadway group in advance, and the panel roadway group is arranged below the top layered goaf 4, so that the lateral support pressure curve of the panel roadway groupE.g. third support pressure curve sigma1' and fourth bearing pressure curve σ2All in the low position, below the critical impact load σ inducing impact initiationcTherefore, the critical load inducing the start of the rock burst is difficult to break through, the purpose of pressure relief arrangement of the panel roadway group is achieved, the level of the dynamic and static loads of surrounding rocks of the panel roadway group is reduced, the risk of the rock burst is effectively reduced, and the possibility of the occurrence of the rock burst is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments can be modified or some or all of the technical features can be equivalently replaced within the spirit and principle of the present invention; such modifications or substitutions do not depart from the scope of the present invention.
Claims (7)
1. A method for preventing rock burst through pressure relief arrangement of roadway groups in a coal seam panel area is characterized by comprising the following steps:
determining mining parameters of a coal seam roof layered mining working face based on the specification parameters of the roadway of the panel to be tunneled;
mining the top of the coal seam in a coal seam to layer according to the mining parameters of the top layered mining working face of the coal seam to form a top layered goaf;
and excavating a plurality of panel area roadways which accord with the specification parameters of the panel area roadway to be excavated below the top layered goaf after a preset time period, wherein the panel area roadways form a panel area roadway group.
2. The method of claim 1, wherein the specification parameters of the panel lanes to be tunneled include height, width, number, arrangement interval and limb protection pillar width of the panel lanes to be tunneled, and the mining parameters of the coal seam roof layered mining face are determined based on the specification parameters of the panel lanes to be tunneled, including:
determining the height of a coal seam top layered mining working surface based on the height of the panel roadway to be tunneled and the total coal seam thickness, wherein the sum of the height of the coal seam top layered mining working surface and the height of the panel roadway to be tunneled is not more than the total coal seam thickness;
determining the total width of the panel roadway group based on the roadway width, the number, the arrangement interval and the adjacent empty protection coal pillar width of the panel roadway to be tunneled;
and setting the width of the coal seam top layered mining working face to be a width value larger than the total width of the panel roadway group.
3. The method according to claim 1 or 2,
before the coal seam is exploited to the top of the coal seam for layering to form a top layered goaf according to the exploitation parameters of the coal seam top layered exploitation working face, the method further comprises the following steps: determining a coal seam area of the coal seam top layer to be mined according to mining parameters of the coal seam top layer mining working face, and respectively arranging top layer mining roadways on two sides of the coal seam area of the coal seam top layer to be mined;
mining the top of the coal seam in a layered manner according to the mining parameters of the top layered mining working face of the coal seam to form a top layered goaf, and the method comprises the following steps: and mining the top of the coal seam in a coal seam by layering according to the mining parameters of the top layered mining working face of the coal seam to form a top layered goaf.
4. The method of claim 1 or 2, wherein mining a roof cut in a coal seam to form a roof cut gob in accordance with mining parameters of the roof cut mining face comprises:
and mining the coal seam roof layering by adopting a fully mechanized top coal caving method according to the mining parameters of the coal seam roof layering mining working face to form a roof layering goaf.
5. The method according to claim 1 or 2,
and the adjacent empty protection coal pillars on two wings of the panel roadway group are positioned between the two top layered mining roadways in the horizontal direction.
6. The method of claim 1 or 2, wherein tunneling a plurality of panel lanes meeting the panel lane specification parameters to be tunneled below the top stratified gob after a preset period of time comprises:
and tunneling a plurality of panel area roadways which accord with the specification parameters of the panel area roadway to be tunneled at preset intervals below the top layered gob.
7. The method of claim 1,
the preset time period is not less than the time period required by the stabilization period of the top layered goaf.
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