CN108051125A - A kind of closed goaf caving zone stress field evolution measurement method - Google Patents
A kind of closed goaf caving zone stress field evolution measurement method Download PDFInfo
- Publication number
- CN108051125A CN108051125A CN201711274371.9A CN201711274371A CN108051125A CN 108051125 A CN108051125 A CN 108051125A CN 201711274371 A CN201711274371 A CN 201711274371A CN 108051125 A CN108051125 A CN 108051125A
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- stress
- caving zone
- working face
- goaf
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
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- General Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a kind of closed goaf caving zone stress field evolution measurement methods, for the stress measurement in fractured coal and rock compacting process in closed goaf under the conditions of Y type draft types, fire dam seals supporting goaf caving zone side gob side entry retaining lane side after the back production of coal seam, according to symmetry principle, in the advance of the face to 0.1D, 0.2D, 0.3D, 0.4D, 5 groups of drillings are played in fire dam bottom during 0.5D at working face 10m to goaf caving zone side, spacing 0.5m, depth is respectively 0.1L, 0.2L, 0.3L, 0.4L, 0.5L, D always promotes length for working face, L is coal working face length；Borehole stressmeter, closing drilling are laid at the top of each drilling.Above-mentioned measured data is directed into matlab numerical analysis softwares, is compacted the size of stress with regard to caving zone any point can be obtained according to difference arithmetic.
Description
Technical field
The present invention, which relates to, belongs to the closed goaf caving zone method for measuring stress in coal seam more particularly to a kind of closed goaf collapses
Fall band stress field evolution measurement method.
Background technology
Goaf caving zone due to comprising a large amount of toxic and harmful gas and water resource, being typically in closed state, it is difficult into
The actual measurement of compacting stress in row caving zone.It is even more to be rarely reported especially for the directly measurement of caving zone internal stress.Substantially
By wirelessly sensing devices being waited remotely to be measured, and since geological condition of coal mine is complicated, radio signal quality is poor, measured result
Accuracy is very low.And the stress distribution feature and its Evolution of caving zone and subsidence, greenhouse gases underground storage, underground
Residual coal spontaneous, groundwater reservoir construction, water resource filtering, the abandoned mine aqueous vapor utilization of resources etc. are closely related.Therefore, accurately slap
The temporal-spatial evolution relation pair safety of coal mines for holding goaf caving zone compacting stress efficiently produces, environmental and ecological protection, resource are sharp again
With etc. have great importance.
The content of the invention
Technical problem：The purpose of the present invention is being directed to problem present in prior art, it is simple, safe to provide a kind of method
Efficiently, the closed goaf caving zone stress field method that feasibility is high, accuracy is high.
The closed goaf caving zone stress intensity of the present invention and the field measurement method of Evolution, including draft type
Selection, fire dam are laid, digital display type borehole stressmeter and its arrangement, stress meter read interval and each process and working face
The mutual cooperation of fltting speed is realized goaf caving zone stress field to develop in real time and is monitored, which is characterized in that including walking as follows
Suddenly：
A, adopted during working face mining using Y type draft types, coal working face after exploiting in gob side entry retaining tunnel
Fire dam is established in dead zone caving zone side, and to isolate goaf gas, support overlying Roof gob side entry retaining is stablized；
B, when coal working face is advanced into 0.1D, D always promotes length for working face, passes through at working face 10m
Fire dam plays 5 groups of drillings into goaf, and drilling is located at fire dam bottom, is spaced 0.5m, depth be respectively 0.1L, 0.2L,
0.3L、0.4L、0.5L；
C, borehole stressmeter is arranged into goaf caving zone by drilling, borehole stressmeter lays depth and is respectively
0.1L, 0.2L, 0.3L, 0.4L, 0.5L, L are coal working face length；
D, after arranging borehole stressmeter, processing is sealed to drilling, drilling hole stress initial value is recorded, by drilling hole stress
Meter access Stress On-Line system, real-time monitor stress size specifically carry out four-stage number according to advance of the face situation
According to record.
E, the first stage every 3 hour record, 1 secondary stress, surveys 3 days, second stage connects every 6 hour record, 1 secondary stress
Continuous to survey 1 week, the phase III, continuous to survey 1 month, fourth stage surveyed 1 secondary stress every 1 day, directly every 12 hour record, 1 secondary stress
It is finished to working face extraction；
When f, at the advance of the face to 0.2D, 0.3D, 0.4D and 0.5D, D always promotes length for working face, repeats to walk
Rapid b-e.
G, borehole stressmeter measured data is transmitted to by server by Stress On-Line system, utilizes matlab data
Handle software and using difference arithmeticEntire goaf caving zone is drawn out each
The regularity of distribution and evolution Feature of the stress of period.
Advantageous effect：Closed goaf caving zone stress measurement can significantly be simplified using the above method, realized close
The high-precision of goaf caving zone stress, safe and efficient measurement are closed, and without carrying out inverse by measuring other data indirectly.And
The acquisition of goaf caving zone stress intensity and Evolution be advantageously implemented safety of coal mines efficiently produce, environmental and ecological protection,
Resource reutilization.
Description of the drawings
Fig. 1 is the closed dead zone caving zone borehole stressmeter arrangement flat sectional drawing of the present invention；
Fig. 2 is the A-A sectional views of Fig. 1；
In figure：1- coal seams, 2- coal working faces, 3- fire dams, 4- gob side entry retainings tunnel, 5- drillings, 6- goafs are caving
Band, 7- borehole stressmeters, 8- advances of the face direction, 9- Stress On-Line systems.
Specific embodiment
One embodiment of the present of invention is further described below in conjunction with the accompanying drawings：
The closed goaf caving zone stress intensity of the present invention and the field measurement method of Evolution, including draft type
Selection, fire dam are laid, digital display type borehole stressmeter and its arrangement, stress meter read interval and each process and working face
The mutual cooperation of fltting speed is realized goaf caving zone stress field to develop in real time and is monitored.
The closed goaf caving zone stress intensity of the present invention and the field measurement method of Evolution, are mainly used for coal seam
In 1 recovery process, the stress measurement under the conditions of Y type draft types in closed 6 compacting process of goaf caving zone.Coal working face
3 supporting of fire dam is carried out at goaf caving zone 6 in gob side entry retaining 4 after 2 exploitations, to isolate goaf gas, dimension
Gob side entry retaining is protected to stablize.According to symmetry principle, it is advanced at 0.1D, 0.2D, 0.3D, 0.4D, 0.5D in working face 2 and is stayed along sky
4 goaf side lane side bottom of lane tunnel is spaced 0.5m away from 5 groups of drillings 5 are played on fire dam at coal working face 10m, and depth is
0.1L, 0.2L, 0.3L, 0.4L, 0.5L, D always promote length for working face.(selection of above-mentioned measuring point mainly considers symmetrical
Principle, actual measurement rectangular 1/4 can be symmetrically to entire working face.) arranged and bored into goaf caving zone 6 by drilling 5
Hole stress meter 7,7 depth of borehole stressmeter are respectively 0.1L, 0.2L, 0.3L, 0.4L, 0.5L, and L is coal working face length.Cloth
After having put borehole stressmeter 7, borehole stressmeter 7 is accessed Stress On-Line system 9, according to pushing away for working face 2 by closing drilling
Into speed, every 3 hour record, 1 secondary stress, survey 3 days.It is continuous to survey 1 week afterwards every 6 hour record, 1 secondary stress.Afterwards every
12 hour record, 1 secondary stress, it is continuous to survey 1 month.1 secondary stress finally was surveyed every 1 day, until working face is opened along mining direction 8
It adopts and finishes.Inventor has found：The compacted property and working face of the time of measuring interval of four-stage and time of measuring and caving zone
Fltting speed is related, and general goaf caving zone can be divided into roof cracking stage (stress with the difference of face propulsion speed
Variation is fast and regularity is poor, short through the power time), accumulative phase at random (stress variation is medium but regular poor, elapsed-time standards compared with
It is short), gradual packing stage (the fast regularity of stress variation is stronger, and elapsed-time standards is longer) and packing stage (the slow width of stress variation
Spend small, elapsed-time standards is long).The present invention has formulated stress data measurement strategies stage by stage according to the characteristics of recovery process.The party
Method has the characteristics that goaf caving zone method for measuring stress is simple, safe and efficient, feasibility is high, accuracy is high, and without logical
It crosses and measures other data progress inverses indirectly.Adopt be advantageously implemented safety of coal mines efficiently produce, environmental and ecological protection, resource it is sharp again
With.
Such as Fig. 1, shown in 2, the exploitation of coal seam 1 causes overlying rock to be caving to form caving zone, belongs to confined space and containing big
Measure toxic and harmful gas and abundant aqueous vapor resource, in gob side entry retaining 4 to goaf caving zone 6 arrange borehole stressmeter 7 into
The actual measurement of row compacting stress, is as follows：
A, in gob side entry retaining 4 after being exploited in 2 recovery process of coal working face using Y type draft types, coal working face 2
Fire dam 3 is established at goaf caving zone 6, to isolate goaf gas, support overlying Roof gob side entry retaining 4 is steady
It is fixed.
B, when coal working face 2 is advanced into working face and always promotes the 1/10 of length, at working face 10m to closed
5 groups of drillings 5 are played in wall 3.Drilling 5 is located at 4 bottom of gob side entry retaining tunnel, is spaced 0.5m.
C, borehole stressmeter 7 is arranged into goaf caving zone 6 by drilling 5,7 depth of borehole stressmeter is respectively
0.1L, 0.2L, 0.3L, 0.4L and 0.5L, L are 2 length of coal working face.
D, after arranging borehole stressmeter 7, processing is sealed to drilling 5,7 initial value of borehole stressmeter is recorded, will bore
Hole stress meter 7 accesses Stress On-Line system 9, and real-time monitor stress size promotes situation specifically to carry out four according to working face 2
A phase data record.On-line monitoring system 9 is located at underground, is that a stress harvester (for gathered data, can record
The stress measured in any time period), the server on ground can be transmitted to after having gathered
E, the first stage every 3 hour record, 1 secondary stress, surveys 3 days, second stage connects every 6 hour record, 1 secondary stress
Continuous to survey 1 week, the phase III, continuous to survey 1 month, fourth stage surveyed 1 secondary stress every 1 day, directly every 12 hour record, 1 secondary stress
It is finished to 2 back production of working face；
F, when working face 2 is advanced at 0.2D, 0.3D, 0.4D and 0.5D, D promotes total length for working face 2, repeats
Step b-e.
G, 7 measured data of borehole stressmeter is transmitted to by server, on-line monitoring system by Stress On-Line system 9
It accesses to downhole optic fiber and is transmitted to ground list server, using matlab data processing softwares and using difference arithmeticDraw out the distribution rule of stress of the entire goaf caving zone 6 in each period
Rule and evolution Feature.The O-ring distribution characteristics that the difference arithmetic that the present invention uses mainly is compacted according to goaf caving zone is (by adopting
Dead zone, which is caving belt edge and is internally compacted stress, to be gradually risen, 0) the compacting stress of caving zone edge is calculates traditional difference
Method is improved.
Certainly, described above is only presently preferred embodiments of the present invention, should the present invention is not limited to enumerate above-described embodiment
When explanation, any those skilled in the art are all equivalent substitutions for being made, bright under the introduction of this specification
Aobvious variant, all falls in the essential scope of this specification, ought to be protected be subject to the present invention.
Claims (2)
1. a kind of closed goaf caving zone stress field evolution measurement method, which is characterized in that include the following steps：
A, in gob side entry retaining tunnel goaf after being exploited during working face mining using Y type draft types, coal working face
Fire dam is established in caving zone side, stablizes to isolate goaf gas and support overlying Roof gob side entry retaining；
B, when coal working face is advanced into 0.1D, D always promotes length for working face, and unit is rice, at working face 10m
Play 5 groups of drillings into goaf by fire dam, drilling is located at fire dam bottom, is spaced 0.5m, depth be respectively 0.1L,
0.2L, 0.3L, 0.4L, 0.5L, L are coal working face length, and unit is rice；
C, multiple borehole stressmeters are arranged into goaf caving zone by drilling, each borehole stressmeter lays depth and is respectively
0.1L、0.2L、0.3L、0.4L、0.5L；
D, after arranging borehole stressmeter, processing is sealed to drilling, drilling hole stress initial value is recorded, borehole stressmeter is connect
Enter Stress On-Line system, real-time monitor stress size, Stress On-Line system is arranged in gob side entry retaining tunnel；Stress
On-line monitoring system is calculated as wired connection with drilling hole stress, and monitoring data are uploaded to ground-based server in real time；
E, according to advance of the face situation, the data of point multiple stage record borehole stressmeters；In each stage, stress is recorded
Time interval is different, and the measurement duration is different, and last stages record time interval of the time interval than earlier stage of stress
Long, the duration of the measurement Duration Ratio earlier stage of last stages record stress is long；
When f, at the advance of the face to 0.2D, 0.3D, 0.4D and 0.5D, step b-e is repeated；
G, borehole stressmeter measured data is transmitted to by ground-based server by Stress On-Line system, using difference arithmeticDraw out the regularity of distribution of stress of the entire goaf caving zone in each period
And evolution Feature, σiFor the compacting stress in caving zone at measuring point i, unit is MPa；σmax, σminTo be respectively several at i points
The maximum stress and minimum stress read in borehole stressmeter, unit are MPa；lmax-minFor the brill of maximum stress reading at i points
Air line distance between the borehole stressmeter of hole stress meter and minimum stress reading, unit are rice, li-minFor i points to minimum stress
The air line distance of reading borehole stressmeter.
2. closed goaf caving zone stress field evolution measurement method as described in claim 1, which is characterized in that the step
E is specially：The data of point four-stage record borehole stressmeter, first stage every 3 hour record, 1 secondary stress, survey 3 days, the
Two-stage, continuous to survey 1 week, the phase III was continuous to survey 1 every 12 hour record, 1 secondary stress every 6 hour record, 1 secondary stress
Month, fourth stage surveyed 1 secondary stress every 1 day, until working face extraction finishes.
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| CN201711274371.9A CN108051125B (en) | 2017-12-06 | 2017-12-06 | A kind of closed goaf caving zone stress field evolution measurement method |
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Cited By (1)
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| CN108801530A (en) * | 2018-08-27 | 2018-11-13 | 神木县隆德矿业有限责任公司 | A kind of ahead work face support pressure coverage measurement method |
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