CN105422173A - Control method for coal impact disasters in coal mining - Google Patents
Control method for coal impact disasters in coal mining Download PDFInfo
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- CN105422173A CN105422173A CN201510855455.6A CN201510855455A CN105422173A CN 105422173 A CN105422173 A CN 105422173A CN 201510855455 A CN201510855455 A CN 201510855455A CN 105422173 A CN105422173 A CN 105422173A
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- coal
- coal body
- rock
- sample
- roof
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention discloses a control method for coal impact disasters in coal mining. The method includes the specific steps of A, determining the friction resistance coefficient, wherein the friction coefficient of a coal sample and a top and bottom plate rock sample is determined through the laboratory attaching and sliding experiments and ratio calculation; B, determining the field implementation related parameter, wherein the drilling size, depth and the amount of water required to be injected and fine-grained coal rock powder or the amount of other lubricating materials are determined, and therefore the friction coefficient mu detected in a laboratory is decreased; C, conducting field implementation, wherein implementation is conducted in two tunnels before coal recovery according to the experiments and calculation conditions; D, conducting effect tests, wherein the slide increasing effect is determined, and related parameters for implementing slide increasing means again are determined according to the monitor effect. When pressure is exerted on top and bottom plates, coal can be made to slide relative to the top and bottom plate rock layers, the elastic performance accumulation in the coal is reduced, and therefore the probability that coal slides to lose stability or is broken and smashed is effectively lowered or eliminated.
Description
Technical field
The present invention relates to coal body in a kind of coal mining and impact the prevention and controls of disaster, belong to control bump technical field.
Background technology
Coal industry is the basic industry of China, and it is healthy, stable, sustainable development is the significant problem being related to national energy security.At underground coal mine, adjoining rock has huge mutual squeezing action to coal seam, especially the tilting action power that long-armed beam and masonry beam produce back production coal body and upper curtate goaf breaking roof are to the inclination squeezing action of section coal pillar, coal seam will certainly be made to produce the trend of relative roof and floor slip, if the friction factor between coal rock layer is larger, the relative sliding in coal seam will be stopped, make in coal seam, to gather great number of elastic energy.When the thrust of horizontal direction is greater than the shear strength of frictional resistance or coal body, unexpected slippage unstability or the impact grinding in coal seam will be caused, fault offset, thus there is coal body impact accident, not only cause roadway destruction, work plane is buried, casualties, above ground structure destroy, also can cause gas, coal-dust explosion and floods, interference ventilation system, the production safety in colliery in serious threat.In recent years, along with the continuous intensification of China's coal-mine mining depth, coal rock dynamic disaster is day by day serious, and coal body impacts disaster more and more becomes the key factor affecting Safety of Coal Mine Production.From the mining Practice in colliery, coal body impacts disaster quantity will be increased gradually, and it will be more serious that coal body impacts disaster.The conventional method that control coal body impacts mainly contains the measures such as water filling release in the release of coal body large diameter borehole, coal body, coal mass relief explosion and the pre-release of tight roof explosion, these methods have certain effect, but also have that unloading pressure means is comparatively single, the inadequate system of prevention and controls, effect not obviously, there is the shortcomings such as limitation.
Summary of the invention
For above-mentioned prior art Problems existing, the invention provides coal body in a kind of coal mining and impact the prevention and controls of disaster, by reducing the friction factor between coal body and adjoining rock, the relative adjoining rock of coal body can be made to slide when roof and floor is pressed, the elasticity reduced in coal body can be gathered, thus will effectively weaken or eliminate coal body slippage unstability or the broken odds impacted.
To achieve these goals, the technical solution used in the present invention is: in this kind of coal mining, coal body impacts the prevention and controls of disaster, and its concrete steps are:
A, determine coefficient of frictional resistance: from mine back production collection in worksite coal body sample and roof and floor rock sample, the experiment of room stick-slip and ratio calculate the friction factor determining coal body sample and roof and floor rock sample by experiment;
B, determine field conduct relevant parameter: field measurement obtains the size of the active force N of adjoining rock suffered by coal body, suffered by coal body, the size of axial stress F and laboratory record coefficientoffrictionμ, determine material requested boring size, the water of the degree of depth and required injection and Bed for Fine Coal rock dust amount or other lubriation material amounts thus reduce laboratory to record coefficientoffrictionμ, make
F＝μN；
C, field conduct: experimentally and calculate resulting materials boring size, the degree of depth and required water and Bed for Fine Coal rock dust amount or other lubriation material amounts, implement material boring and high-pressure injected water and Bed for Fine Coal rock dust or other known lubriation materials in coal body back production Qian Liang lane between coal body and adjoining rock;
D, validity check: after above-mentioned measure is implemented, during Roof Breaking is pressed, in back production two lane, implementing monitoring coal body displacement (amount of shifting near namely by measuring roadway's sides is determined), determining to increase sliding effect and determining again to implement to increase sliding measure relevant parameter according to monitoring effect.
Further, the supporting intensity in two lanes is strengthened while implementing to increase sliding effect in step D by increasing coal column.
Coal body slippage impact principle:
On the one hand, in underground coal mine exploitation process, coal seam is produced to the active force of level and vertical both direction under the comprehensive function of semi girder and masonry beam.Along with work plane constantly advances, semi girder length constantly increases, and it also constantly increases coal body active force simultaneously.Owing to there is frictional resistance effect between coal body and adjoining rock, coal seam is difficult to slide, like this due to the continuous increase of active force, the elasticity gathered in coal body can constantly accumulate, the thrust in final level direction is greater than the shear strength of frictional resistance or coal body, thus cause the unexpected slippage of coal body or impact grinding, namely there is back production coal body and impact disaster.
On the other hand, after upper curtate goaf top plate is caving, be caving top board and produce lateral compression effect to the coal column between two work planes, this active force can be decomposed into level and vertical both direction equally.Along with being constantly caving of overlying rock, being caving the squeezing action of top board to coal column constantly increases, and coal column inner accumulated energy constantly increases, when the thrust of horizontal direction is greater than the shear strength of frictional resistance or coal body, fault offset, coal column slippage unstability or broken outstanding, thus bring out coal column impact failure.
The present invention by implementing material boring and high-pressure injected water and Bed for Fine Coal rock dust or other known lubriation materials in coal body back production Qian Liang lane between coal body and adjoining rock, thus reduces coefficientoffrictionμ; When coefficient of frictional resistance μ reduces, there is motive force F needed for relative sliding and also decrease, therefore contact surface more easily relative sliding occurs.Like this when adjoining rock is pressed, coal body and adjoining rock can occur relative interactive, will be difficult to produce elasticity in such coal and rock can gather, the most effectively weaken or eliminate coal body slippage unstability or the broken odds impacted, realizing effective control that coal body impacts disaster.
Accompanying drawing explanation
Fig. 1 is that masonry beam, long-armed beam are to back production coal body effect schematic diagram.
Fig. 2 is that upper curtate is caving top board to section coal pillar effect schematic diagram.
Fig. 3 is stick-slip experimental facilities schematic diagram in the present invention.
Fig. 4 is field conduct schematic diagram of the present invention.
In figure: 1, coal body; 2, false roof and immediate roof; 3, Lao Ding; 4, overlying rock; 5, goaf; 6, coal column; 7, tunnel; 8, coal body sample; 9, roof and floor rock sample; 10, adjoining rock; 12, hole.
Detailed description of the invention
The invention will be further described below.
As shown in Figures 1 to 4, concrete steps of the present invention are:
A, determine coefficient of frictional resistance: from mine back production collection in worksite coal body sample 8 and roof and floor rock sample 9, the experiment of room stick-slip and ratio calculate the friction factor determining coal body sample 8 and roof and floor rock sample 9 by experiment; Specifically coal petrography sample is combined in laboratory by top board-base plate-coal seam and carries out shearing slip experiment, set an axial force N, horizontal direction power F is applied until coal body sample 8 slides to coal body sample 8, calculates coefficient of frictional resistance according to shear stress and vertical stress:
μ＝F/N
B, determine field conduct relevant parameter: before underground coal mine exploitation, in coal body, drilling 12 installs borehole stressmeter, the size of the active force N gathering adjoining rock 10 suffered by coal body 1 can be implemented, the size of the shear stress F of horizontal direction suffered by actual according to coal body 1 and laboratory record coefficientoffrictionμ and carry out similarity simulation experiment, setting injection material amount forms contrast, reduce laboratory record coefficientoffrictionμ according to the water of similarity simulation experiment determination material requested boring size, the degree of depth and required injection and Bed for Fine Coal rock dust amount or other lubriation material amounts, make
F＝μN；
C, field conduct: experimentally and calculate resulting materials boring size, the degree of depth and required water and Bed for Fine Coal rock dust amount or other lubriation material amounts, implement material and hole also high-pressure injected water and Bed for Fine Coal rock dust or other known lubriation materials in coal body back production Qian Liang lane between coal body 1 and adjoining rock 10; In order to ensure that injection material fully can cover contact surface, bore diameter generally selects about 110mm (with major diameter destressing borehole equal diameters).On Working Face Coak intrusion contact surface, drilling depth is generally set as the half of face length, and the vertical lane side of boring 12 arranges and coal body 1 both sides; 12 degree of depth that tunnel protection coal pillar coal and rock contact surface is holed generally are set as the half of coal column 6 width, and the vertical lane side of boring 12 is arranged in current stope drift active workings side;
D, validity check: after above-mentioned measure is implemented, during Roof Breaking is pressed, in back production two lane, implementing monitoring coal body displacement (amount of shifting near namely by measuring 7 liang, tunnel side is determined), determining to increase sliding effect and determining again to implement to increase sliding measure relevant parameter according to monitoring effect.
Further, the supporting intensity in two lanes is strengthened while implementing to increase sliding effect in step D by increasing coal column.
Claims (2)
1. in coal mining, coal body impacts a prevention and controls for disaster, and it is characterized in that, its concrete steps are:
A, determine coefficient of frictional resistance: from mine back production collection in worksite coal body sample (8) and roof and floor rock sample (9), the experiment of room stick-slip and ratio calculate the friction factor determining coal body sample (8) and roof and floor rock sample (9) by experiment;
B, determine field conduct relevant parameter: field measurement obtains the size of the active force N of adjoining rock suffered by coal body (10), coefficientoffrictionμ is recorded according to the size of the suffered axial stress F of coal body (1) and laboratory, determine material requested boring (12) size, the water of the degree of depth and required injection and Bed for Fine Coal rock dust amount or other lubriation material amounts thus reduce laboratory to record coefficientoffrictionμ, make
F＝μN；
C, field conduct: experimentally and calculate resulting materials boring size, the degree of depth and required water and Bed for Fine Coal rock dust amount or other lubriation material amounts, implement material and to hole also high-pressure injected water and Bed for Fine Coal rock dust or other known lubriation materials in coal body back production Qian Liang lane between coal body (1) and adjoining rock (10);
D, validity check: after above-mentioned measure is implemented, during Roof Breaking is pressed, implement monitoring coal body (1) displacement, determine to increase sliding effect and determine again to implement to increase sliding measure relevant parameter according to monitoring effect in back production two lane.
2. in a kind of coal mining according to claim 1, coal body impacts the prevention and controls of disaster, it is characterized in that, strengthens the supporting intensity in two lanes while implementing to increase sliding effect in step D by increasing coal column (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510855455.6A CN105422173B (en) | 2015-11-27 | 2015-11-27 | The prevention and controls of coal body impact disaster in a kind of coal mining |
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| CN201510855455.6A CN105422173B (en) | 2015-11-27 | 2015-11-27 | The prevention and controls of coal body impact disaster in a kind of coal mining |
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| CN105422173A true CN105422173A (en) | 2016-03-23 |
| CN105422173B CN105422173B (en) | 2017-12-22 |
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| CN201510855455.6A Expired - Fee Related CN105422173B (en) | 2015-11-27 | 2015-11-27 | The prevention and controls of coal body impact disaster in a kind of coal mining |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110306984A (en) * | 2019-07-08 | 2019-10-08 | 辽宁工程技术大学 | A kind of baseboard of coal mine roadway type Controlling of Coal Outburst method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1172891A (en) * | 1996-08-06 | 1998-02-11 | 罗建民 | Integral coal mining method |
| CN102536282A (en) * | 2012-02-27 | 2012-07-04 | 西安科技大学 | Method for preventing and controlling bottom heaving disaster of mine stoping tunnel |
| CN103939099A (en) * | 2014-04-11 | 2014-07-23 | 中国矿业大学 | Method for controlling strong shock risk coal seam group rock burst |
| CN104949890A (en) * | 2015-05-26 | 2015-09-30 | 中国矿业大学 | Experimental method for simulating fault slip |
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2015
- 2015-11-27 CN CN201510855455.6A patent/CN105422173B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1172891A (en) * | 1996-08-06 | 1998-02-11 | 罗建民 | Integral coal mining method |
| CN102536282A (en) * | 2012-02-27 | 2012-07-04 | 西安科技大学 | Method for preventing and controlling bottom heaving disaster of mine stoping tunnel |
| CN103939099A (en) * | 2014-04-11 | 2014-07-23 | 中国矿业大学 | Method for controlling strong shock risk coal seam group rock burst |
| CN104949890A (en) * | 2015-05-26 | 2015-09-30 | 中国矿业大学 | Experimental method for simulating fault slip |
Non-Patent Citations (2)
| Title |
|---|
| 齐庆新等: "冲击地压的摩擦滑动失稳机理", 《矿山压力与顶板管理》 * |
| 齐庆新等: "冲击地压粘滑失稳机理的实验研究", 《煤炭学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110306984A (en) * | 2019-07-08 | 2019-10-08 | 辽宁工程技术大学 | A kind of baseboard of coal mine roadway type Controlling of Coal Outburst method |
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Address after: No. 1, Tongshan University Road, Xuzhou, Jiangsu Province, Jiangsu Patentee after: China University of Mining & Technology Address before: 221000 Xuzhou University Road, Jiangsu, No. 1 Patentee before: China University of Mining & Technology |
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Granted publication date: 20171222 Termination date: 20181127 |