CN112483183A - Method for judging impact risk of working face side to hard top plate by window intervention method - Google Patents
Method for judging impact risk of working face side to hard top plate by window intervention method Download PDFInfo
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- CN112483183A CN112483183A CN202011504977.9A CN202011504977A CN112483183A CN 112483183 A CN112483183 A CN 112483183A CN 202011504977 A CN202011504977 A CN 202011504977A CN 112483183 A CN112483183 A CN 112483183A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005516 engineering process Methods 0.000 claims abstract description 10
- 238000011155 quantitative monitoring Methods 0.000 claims abstract description 3
- 239000003245 coal Substances 0.000 claims description 20
- 239000002023 wood Substances 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 2
- 230000035939 shock Effects 0.000 claims description 2
- 239000011435 rock Substances 0.000 abstract description 7
- 230000003068 static effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a method for judging impact risk of a working face to a hard top plate by a window intervention method, which comprises the following steps: step one, quantitative monitoring of a suspended roof structure: step two, a manual window intervention technology: step three, a window observation method; by aiming at the top plate motion tendency characteristic of the side suspended ceiling type rock burst, observing the sinking amount of the roadway top plate along the tendency, and judging the side top plate tendency motion induced impact risk; and (4) acquiring an impact dangerous area caused by the movement trend of the lateral top plate under the static condition of the roadway by comparing and observing the sinking speeds of the top plate in the key dangerous area, and carrying out early warning on the intensity of 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 working face to a hard top plate 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 risk prediction of the tired impact ground pressure 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: the method for judging the impact risk of the working face to the hard top plate by using the window intervention method comprises the following steps:
step one, quantitative monitoring of a suspended roof structure: firstly, clearing a roadway top and bottom plate, observing a side suspended roof structure at fixed points at equal intervals when the top and the bottom are seen, wherein the distance between measuring points is 10-12 m; monitoring and determining the characteristics of the lateral suspended roof structure;
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, a window observation method: manually drilling a row of large-diameter holes on one side of a working surface of the roadway, uniformly arranging the large-diameter holes from a distance of 1.2m from a bottom plate to a top plate, and keeping a large bearing coal body between the drilled holes, wherein the depth of the large-diameter holes is 3-4 times of the height of the roadway; and then a long-strip wood support is arranged in the drill hole, filler (such as coal powder) is added between the wood support and the coal body, certain friction force is provided, the expansion and damage movement of the deep coal body can be judged by observing the trend movement strength of the wood support, and the impact danger can be judged by the movement strength.
The invention has the positive effects that:
1. the structural quantitative observation is carried out on the lateral suspended ceiling, the spatial structure characteristics of the lateral top plate under the static state are determined qualitatively, and the pre-judgment function for determining the impact risk is achieved in advance;
2. aiming at the top plate movement tendency characteristic of the side suspended ceiling type rock burst, observing the sinking amount of the roadway top plate along the tendency, and judging the side top plate tendency movement induced impact risk;
3. and (4) acquiring an impact dangerous area caused by the movement trend of the lateral top plate under the static condition of the roadway by comparing and observing the sinking speeds of the top plate in the key dangerous area, and carrying out early warning on the intensity of impact danger.
Drawings
Fig. 1 is a schematic diagram of a lateral suspended roof structure, fig. 2 is a schematic diagram of a window intervention technology, and fig. 3 is a schematic diagram of a coal body expansion motion curve.
Detailed Description
The embodiment of the invention provides a method for judging impact risk of a working face to a hard top plate by using a window intervention method, which comprises the following steps:
firstly, observing a lateral suspended ceiling at a distance of 10-12 m; the drilling detection technology is adopted to carry out quantitative detection on the suspended roofs below 5m and above 7m, which is shown in figure 1;
carrying out window intervention observation on the impact dangerous area, adopting a multi-section comparison observation scheme, wherein the window depth is 10-15m, generally adopting a large-diameter (115 mm) drill hole, installing a wood support (CDE is an observation point for installing the wood support) in the drill hole, and filling the drill hole with pulverized coal, which is shown in figure 2;
thirdly, arranging an observation fixed point (B is a base point) on the roadway bottom plate, observing the displacement of the wood pillar, carrying out comparative observation to obtain a displacement curve, carrying out sudden change according to the curve, judging the impact danger degree according to the curve form, wherein the displacement is more than 1% of the drilling length, 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 (2)
1. The prediction method of the impact ground pressure induced by the working face side to the hard top plate is characterized in that: the method comprises the following steps:
step one, quantitative monitoring of a suspended roof structure: firstly, clearing a roadway top and bottom plate, observing a side suspended roof structure at fixed points at equal intervals when the top and the bottom are seen, wherein the distance between measuring points is 10-12 m; monitoring and determining the characteristics of the lateral suspended roof structure;
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, a window observation method: manually drilling a row of large-diameter holes on one side of a working surface of the roadway, uniformly arranging the large-diameter holes from a distance of 1.2m from a bottom plate to a top plate, and keeping a large bearing coal body between the drilled holes, wherein the depth of the large-diameter holes is 3-4 times of the height of the roadway; and then a long-strip wood support is installed in the drill hole, filler is added between the wood support and the coal body, certain friction force is achieved, the expansion and damage movement of the deep coal body can be judged by observing the trend movement strength of the wood support, and the impact danger can be judged by the movement strength.
2. The prediction method of claim 1, wherein: the filler in the third step is coal powder.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011504977.9A CN112483183A (en) | 2020-12-18 | 2020-12-18 | Method for judging impact risk of working face side to hard top plate by window intervention method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011504977.9A CN112483183A (en) | 2020-12-18 | 2020-12-18 | Method for judging impact risk of working face side to hard top plate by window intervention method |
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| CN112483183A true CN112483183A (en) | 2021-03-12 |
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| CN202011504977.9A Pending CN112483183A (en) | 2020-12-18 | 2020-12-18 | Method for judging impact risk of working face side to hard top plate by window intervention method |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101313A (en) * | 2014-08-04 | 2014-10-15 | 山东科技大学 | Method for quantitative observation determination of impact coal body volume expansion |
| CN105275462A (en) * | 2015-10-27 | 2016-01-27 | 山东科技大学 | Method for testing creep deformation type rock burst dangerous area immediately on site |
| CN106443784A (en) * | 2016-10-20 | 2017-02-22 | 山东科技大学 | Fault zone rock burst dangerousness monitoring method |
| CN108386192A (en) * | 2018-01-31 | 2018-08-10 | 中国矿业大学 | A kind of method of active Enhanced support and active release prevention bump |
| CN110924945A (en) * | 2019-12-13 | 2020-03-27 | 山东科技大学 | Safe working method under condition of lateral suspended roof rock burst |
| CN111365077A (en) * | 2020-03-19 | 2020-07-03 | 中国矿业大学(北京) | Pressure relief and monitoring method for continuous large deformation of deep roadway coal side |
| CN111456787A (en) * | 2020-04-20 | 2020-07-28 | 辽宁工程技术大学 | Surrounding rock gradient deformation monitoring device based on scour prevention anchor cable and impact early warning method |
| 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 |
| CN111911209A (en) * | 2020-08-17 | 2020-11-10 | 河北工程大学 | Accurate targeted anchor grouting control method suitable for deep soft rock roadway |
-
2020
- 2020-12-18 CN CN202011504977.9A patent/CN112483183A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101313A (en) * | 2014-08-04 | 2014-10-15 | 山东科技大学 | Method for quantitative observation determination of impact coal body volume expansion |
| CN105275462A (en) * | 2015-10-27 | 2016-01-27 | 山东科技大学 | Method for testing creep deformation type rock burst dangerous area immediately on site |
| CN106443784A (en) * | 2016-10-20 | 2017-02-22 | 山东科技大学 | Fault zone rock burst dangerousness monitoring method |
| CN108386192A (en) * | 2018-01-31 | 2018-08-10 | 中国矿业大学 | A kind of method of active Enhanced support and active release prevention bump |
| CN110924945A (en) * | 2019-12-13 | 2020-03-27 | 山东科技大学 | Safe working method under condition of lateral suspended roof rock burst |
| CN111365077A (en) * | 2020-03-19 | 2020-07-03 | 中国矿业大学(北京) | Pressure relief and monitoring method for continuous large deformation of deep roadway coal side |
| CN111456787A (en) * | 2020-04-20 | 2020-07-28 | 辽宁工程技术大学 | Surrounding rock gradient deformation monitoring device based on scour prevention anchor cable and impact early warning method |
| 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 |
| CN111911209A (en) * | 2020-08-17 | 2020-11-10 | 河北工程大学 | Accurate targeted anchor grouting control method suitable for deep soft rock roadway |
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Application publication date: 20210312 |
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