CN112483182A - Method for judging impact risk of high-homogeneity coal seam by window intervention method - Google Patents
Method for judging impact risk of high-homogeneity coal seam by window intervention method Download PDFInfo
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- CN112483182A CN112483182A CN202011504961.8A CN202011504961A CN112483182A CN 112483182 A CN112483182 A CN 112483182A CN 202011504961 A CN202011504961 A CN 202011504961A CN 112483182 A CN112483182 A CN 112483182A
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- 239000003245 coal Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000011435 rock Substances 0.000 claims abstract description 12
- 238000005422 blasting Methods 0.000 claims abstract description 9
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 238000011156 evaluation Methods 0.000 claims abstract description 4
- 230000035939 shock Effects 0.000 claims abstract description 4
- 238000005065 mining Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
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Classifications
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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
- E21F17/18—Special adaptations of signalling or alarm devices
- E21F17/185—Rock-pressure control devices with or without alarm devices; Alarm devices in case of roof subsidence
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/02—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection having means for indicating tension
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a method for judging impact risk of a high-homogeneity coal seam by using a window intervention method, which comprises the following steps of: step one, determining a dangerous area: determining a dangerous area according to specific conditions of a coal bed, rock burst influence factors and rock burst danger evaluation results and specific monitoring data; step two, a manual window intervention technology: because the coal seam has high homogeneity, the damage of the coal seam appears as a main shock type, the dangerous area needs to be manually damaged, and a weak surface is manufactured and used as a window for observing the impact danger; step three, judging impact danger by deformation of the anchor cable in the window: on the working face of the roadway, a chamber is manufactured artificially, and the height, the width and the depth are respectively as follows: 2. 2, 3m, firstly blasting the head-on side, and then carrying out conventional anchor rod support on the chamber, wherein the depth of the blasting is 3-4 m; mounting an anchor cable at the head of the chamber, wherein the depth is 5-6m, and mounting a dynamometer at the outer end of the anchor cable; and observing the stress of the anchor cable, and when sudden change occurs, judging the anchor cable to be in impact danger.
Description
Technical Field
The invention belongs to the technical field of coal mining, and particularly relates to a method for judging impact risk of a high-homogeneity coal seam by using a window intervention method.
Background
Face mining to form a laterally stiff roof overhang often results in a dynamic disaster. The impact ground pressure caused by the lateral hard roof of the stope is shown to occupy a larger proportion, and the dangerous area is larger and the strength is generally higher. Due to the fact that the spatial structure of the side roof overhang has irregularity and extremely complexity, distribution of stress fields of the gate grooves has great difference, and zoning is caused by the danger of rock burst. How to predict the danger of rock burst of a working face side-to-hard roof plate type is a great technical problem faced by coal mines.
At present, the prediction of the rock burst danger is basically consistent with that of a common working surface, mainly comprises microseismic, a drilling cutting method, electromagnetic radiation, stress change, mine pressure observation and the like, and has poor pertinence and reliability. Because the lateral hard suspended roof structure of the working face can often cause a larger static load when the working face is tunneled along an empty side roadway, the danger during tunneling is serious, and the dynamic fracture effect of the working face top plate is added during mining, so the danger is increased rapidly. At present, a top-breaking and roadway-retaining technology is adopted, although a lower rock stratum is damaged, the upper position still has a lateral suspended roof structure, and a coal seam is subjected to the action of the whole process of the movement of a lateral working face top plate, so that roadway wall caving and shortness pressing are serious, and local high stress is caused.
Until now, no specific prediction method for forming the specific and specific danger of the gate-driving impact aiming at the specific coal seam condition of the lateral hard suspended roof exists. Particularly, under the condition of high-position suspended ceiling of a lateral hard top plate, when large-area instability fracture motion occurs in the suspended ceiling structure, large-area and high-level impact energy is released, and the possibility of generating destructive rock burst is increased. When the coal seam has a strong impact tendency and has high homogeneity, the conventional monitoring technology of the conventional method is difficult to quantitatively early warn the danger of hard roof type rock burst and predict the static danger distribution caused by a suspended roof structure in advance. And a manual intervention method is needed, the high homogeneity characteristic of the coal seam is broken, and the impact risk precursor information is predicted in advance.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a method for judging impact risks by a human window intervention technology aiming at the situation that the impact risks of a roadway are difficult to predict under the condition that a hard suspended roof exists laterally.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for judging impact risk of a high-homogeneity coal seam by using a window intervention method comprises the following steps:
step one, determining a dangerous area: determining a dangerous area according to specific conditions of a coal bed, rock burst influence factors and rock burst danger evaluation results and specific monitoring data;
step two, a manual window intervention technology: because the coal seam has high homogeneity, the damage of the coal seam appears as a main shock type, a dangerous area needs to be manually damaged, a weak surface is manufactured and is used as a window for impact risk observation, namely, a window intervention technology;
step three, judging impact danger by deformation (stress) of the anchor cable in the window: on the working face of the roadway, a chamber is manufactured artificially, and the height, the width and the depth are respectively as follows: 2. 2, 3m, firstly blasting the head-on side, and then carrying out conventional anchor rod support on the chamber, wherein the depth of the blasting is 3-4 m; mounting an anchor cable at the head of the chamber, wherein the depth is 5-6m, and mounting a dynamometer at the outer end of the anchor cable; the anchor cable is observed to be stressed (equivalent to deformation), and when sudden change occurs, the anchor cable is regarded as a shock hazard.
The invention has the positive effects that:
1. firstly, determining a danger area of a high homogeneous coal bed through multi-factor impact danger analysis and actual monitoring;
2. aiming at the characteristic of high homogeneity of the coal body, a window intervention technology is adopted to manufacture a weak space, and the deformability of the coal body at the deep part of the weak space is monitored so as to judge the coal body impact risk in the region;
3. and (4) comparing and observing the displacement of the deep coal body to obtain the mutation characteristic of the displacement change, and performing real-time early warning on the impact risk.
Drawings
Fig. 1 is a schematic view of an impact hazard zone, fig. 2 is a schematic view of a chamber window design, and fig. 3 is a coal displacement curve.
Detailed Description
The embodiment of the invention provides a method for judging impact risk of a high-homogeneity coal seam by using a window intervention method, which comprises the following steps:
firstly, determining an impact danger area according to data such as geological mining conditions of a specific working face, impact ground pressure danger evaluation reports and the like and by combining specific observation data, wherein the figure is 1;
secondly, carrying out window chamber construction on the impact dangerous area, wherein the window size is as follows: the height, width and depth are 2, 2 and 3m, blasting modification is carried out, the depth of a blasting hole is 3-4m, an anchor cable is installed at the head of the chamber, the length is 6m, a dynamometer is installed, 1 is a roadway, 2 is the chamber, 3 is the blasting hole, and 4 is the anchor cable (with the dynamometer), and the diagram is shown in figure 2;
and thirdly, leading the dynamometer observation sensor out of the chamber, backfilling the chamber, observing the stress condition of the anchor cable, judging the impact danger degree according to the stress curve form, wherein W is a danger curve, and the figure is 3.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A method for judging impact risk of a high-homogeneity coal seam by using a window intervention method is characterized by comprising the following steps: the method comprises the following steps:
step one, determining a dangerous area: determining a dangerous area according to specific conditions of a coal bed, rock burst influence factors and rock burst danger evaluation results and specific monitoring data;
step two, a manual window intervention technology: because the coal seam has high homogeneity, the damage of the coal seam appears as a main shock type, a dangerous area needs to be manually damaged, a weak surface is manufactured and is used as a window for impact risk observation, namely, a window intervention technology;
step three, judging impact danger by deformation of the anchor cable in the window: on the working face of the roadway, a chamber is manufactured artificially, and the height, the width and the depth are respectively as follows: 2. 2, 3m, firstly blasting the head-on side, and then carrying out conventional anchor rod support on the chamber, wherein the depth of the blasting is 3-4 m; mounting an anchor cable at the head of the chamber, wherein the depth is 5-6m, and mounting a dynamometer at the outer end of the anchor cable; and observing the stress of the anchor cable, and when sudden change occurs, judging the anchor cable to be in impact danger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011504961.8A CN112483182A (en) | 2020-12-18 | 2020-12-18 | Method for judging impact risk of high-homogeneity coal seam by window intervention method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011504961.8A CN112483182A (en) | 2020-12-18 | 2020-12-18 | Method for judging impact risk of high-homogeneity coal seam by window intervention method |
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| Publication Number | Publication Date |
|---|---|
| CN112483182A true CN112483182A (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011504961.8A Pending CN112483182A (en) | 2020-12-18 | 2020-12-18 | Method for judging impact risk of high-homogeneity coal seam by window intervention method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454010A (en) * | 2014-12-10 | 2015-03-25 | 西安科技大学 | Integrated monitoring and early warning system and early warning method for dynamic condition of deep well drivage construction |
| CN105626070A (en) * | 2015-12-14 | 2016-06-01 | 辽宁工程技术大学 | Rock burst prevention method through deep hole blasting and depressurizing |
| CN106368705A (en) * | 2016-10-20 | 2017-02-01 | 山东科技大学 | Method for controlling rock burst during roadway tunneling in fault fracture zone |
| CN106522950A (en) * | 2016-10-20 | 2017-03-22 | 山东科技大学 | Method for monitoring rock burst risk of soft coal roadway posterior |
| CN109915141A (en) * | 2019-04-13 | 2019-06-21 | 山东科技大学 | The control method of not wide protection pillar mining roadway bump |
| CN111502662A (en) * | 2020-04-28 | 2020-08-07 | 中煤能源研究院有限责任公司 | Prevention and control method for deep pressure relief shallow part reinforcement of rock burst mine advanced coal body |
-
2020
- 2020-12-18 CN CN202011504961.8A patent/CN112483182A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454010A (en) * | 2014-12-10 | 2015-03-25 | 西安科技大学 | Integrated monitoring and early warning system and early warning method for dynamic condition of deep well drivage construction |
| CN105626070A (en) * | 2015-12-14 | 2016-06-01 | 辽宁工程技术大学 | Rock burst prevention method through deep hole blasting and depressurizing |
| CN106368705A (en) * | 2016-10-20 | 2017-02-01 | 山东科技大学 | Method for controlling rock burst during roadway tunneling in fault fracture zone |
| CN106522950A (en) * | 2016-10-20 | 2017-03-22 | 山东科技大学 | Method for monitoring rock burst risk of soft coal roadway posterior |
| CN109915141A (en) * | 2019-04-13 | 2019-06-21 | 山东科技大学 | The control method of not wide protection pillar mining roadway bump |
| CN111502662A (en) * | 2020-04-28 | 2020-08-07 | 中煤能源研究院有限责任公司 | Prevention and control method for deep pressure relief shallow part reinforcement of rock burst mine advanced coal body |
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Application publication date: 20210312 |
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