CN106643630B - It is a kind of monitoring the back production of gob side entry retaining obturation during stability system and method - Google Patents
It is a kind of monitoring the back production of gob side entry retaining obturation during stability system and method Download PDFInfo
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- CN106643630B CN106643630B CN201611012413.7A CN201611012413A CN106643630B CN 106643630 B CN106643630 B CN 106643630B CN 201611012413 A CN201611012413 A CN 201611012413A CN 106643630 B CN106643630 B CN 106643630B
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- obturation
- pressure cell
- side entry
- entry retaining
- gob side
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
Abstract
The invention discloses a kind of system and method for stability during monitoring gob side entry retaining obturation back production, including embedded strain gauge and pressure cell；Pre-buried row embedded strain gauge and row's pressure cell in gob side entry retaining obturation, embedded strain gauge and pressure cell are arranged in parallel and respectively by bracket fixations with steel wire；The end connecting cable of embedded strain gauge and pressure cell, data are transferred to portable strain signal acquisition system by cable.The present invention uses invasive measurement means, reflects the size of the strain of gob side entry retaining obturation internal stress, plastic zone development and residual stress；It is easy for installation, insulation explosion-proof performance is good, strong antijamming capability, transmits at a distance undistorted using vibrating string extensometer and pressure cell, it is suitable for being monitored for a long time in the adverse circumstances of underground.
Description
Technical field
The present invention relates to a kind of system and method for stability during monitoring gob side entry retaining obturation back production, belong to mining neck
Domain.
Background technique
Gob side entry retaining is remained upper curtate haulage way by constructing a hand-packing strip, as upper curtate
Return air tail lane and lower curtate tailgate are multiplexed.Gob side entry retaining is high with resource recovery, Linking up digging is reasonable, tunnel pick
Into the low advantage of rate, and be conducive to roadway arrangement reform, for many years the important technology of always domestic and international subterranean resource exploitation
Developing direction.Due to be subjected to upper and lower 2 section working face, 2 strong mining influences, thus the activity of gob side entry retaining country rock is acutely,
Maintenance difficulties are larger, and the bearing capacity and stability of obturation are to maintain the stable key of roadway surrounding rock.Gob side entry retaining fills by lane
Fill out the main function of band: first is that the absciss layer that control is directly pushed up and direct top and the bottom base object model for cutting off mined out side in time, to subtract
The deformation of load and roadway surrounding rock suffered by few support in mine gateway；Second is that timely close the goaf, prevents from leaking out and send out naturally with float coal
Fire.
STABILITY MONITORING of the gob side entry retaining obturation during 2 back production include obturation deflection, plastic zone range and
Core space intensity.Due to the complexity of underground mining environment, disturbing factor is more when monitoring, is used at present still without effective method
Monitor the stability during 2 back production of gob side entry retaining obturation.
Summary of the invention
The present invention is intended to provide it is a kind of monitoring the back production of gob side entry retaining obturation during stability system and method, be suitable for
Filling mining field.
The system and method for stability, are stayed along sky during a kind of monitoring gob side entry retaining obturation back production provided by the invention
Pre-buried row embedded strain gauge and row's pressure cell, data pass through long cable transmission to portable strain signal in the obturation of lane
Acquisition system carries out long term monitoring to gob side entry retaining obturation stability.Embedded strain gauge is used for real-time monitoring gob side entry retaining
The internal modification of obturation, pressure cell is for the range of plastic zone (destruction area) and edge inside real-time monitoring gob side entry retaining obturation
The lane Kong Liu obturation residual strength, the two are combined and are monitored to the stability of gob side entry retaining obturation；Portable strain signal
Acquisition system carries out taken at regular intervals and record to monitoring data, is then saved and is divided by data of the computer to record
Analysis.
The gob side entry retaining obturation is rectangular parallelepiped structure, and length is face length, and width is according to overburden pressure
It is determined with filler bearing capacity, is highly working face mining height；The material used is concrete material, paste filling material, cash
Stone cemented filling material, (super) high water filling material it is one or more；
The present invention provides a kind of systems of stability during monitoring gob side entry retaining obturation back production, including flush type strain
Meter, pressure cell and portable strain signal acquisition system；The pre-buried row embedded strain gauge and one in gob side entry retaining obturation
Pressure cell is arranged, embedded strain gauge and pressure cell are arranged in parallel；It is solid that embedded strain gauge and pressure cell pass through bracket steel wire respectively
It is fixed；The end connecting cable of embedded strain gauge and pressure cell passes through the portable strain signal acquisition system of cable connection；
The embedded strain gauge built-in temperature sensor influences the variation generated to ambient temperature and carries out temperature adjustmemt；
Each sensor internal has computing chip, is converted automatically to measurement data and directly exports physical quantity, and manual conversion is reduced
Fault and error；
The pressure cell is manufactured using vibratory string Theoretical Design, using all-digital detection, the exciting in the way of pulse excitation；
The portable strain signal acquisition system is explosion-proof type intelligent reading instrument；Pressure value and vibratory string frequency can be directly displayed
Rate, data connect explosion-proof type intelligent reading instrument " INP " socket by cable wire end plug；Explosion-proof type intelligent reading instrument is equipped with
" RS232 " computer connection interface, export data are connect with computer and are saved, and the data of preservation are imported Excel table, are drawn
Strain-pressue-graph out can be analyzed, and judge the stability of gob side entry retaining obturation.
In above-mentioned system, the pressure cell selects corresponding model according to different requirements, is equipped with portable strain signal
Acquisition system can directly display pressure value, and can show vibratory string frequency, and measurement is intuitive, easy, quick；Measuring point can directly be measured
Temperature, and can be carried out temperature-compensating (temperature mode).
Further, the embedded strain gauge, the long 150mm of size, mid diameter 22mm, range is 3000 μ ε, is surveyed
Accuracy of measurement be 1 μ ε, use environment temperature: 80 DEG C of -20 DEG C~﹢, -20 DEG C~+125 DEG C of temperature range, sensitivity of thermometry 0.25
℃。
Further, the pressure cell, diameter 20mm can mistakes with a thickness of 8mm, range 10MPa, precision 1kPa
Carry 150%, use environment temperature: 80 DEG C of -20 DEG C~﹢, -20 DEG C~+80 DEG C of temperature range, sensitivity of thermometry is 0.5 DEG C.
Further, there is protective cover on the explosion-proof type intelligent reading instrument, have the function of dustproof and anti-explosion waterproof, there is calculating
Machine interface can be connected with computer and export data；And there are operation button and data display screen, can directly operate and read number
According to.
Further, the explosion-proof type intelligent reading instrument has 6 signal paths, can simultaneously to 6 string wire sensors into
Row measurement, stores 8000 strain datas.Explosion-proof type intelligent reading instrument have detection speed it is fast, measurement accuracy is high, it is easy to operate,
It is small in size, light-weight, power is low, using the time it is long, easy to carry the advantages that.
Further, the cable is four core shielded cables, and strain gauge and pressure cell are directly connected to just by cable
Formula strain signal acquisition system is taken, the data of strain gauge and pressure cell are transmitted to portable strain signal acquisition system, is carried out
Reading and post-processing；The post-processing is to analyze the reading of portable strain signal acquisition system, judges gob side entry retaining
The stability of obturation.
The present invention provides a kind of methods of stability during monitoring gob side entry retaining obturation back production, using above-mentioned monitoring edge
The system and method for stability during the obturation back production of the lane Kong Liu, comprising the following steps:
(1) it installs: pre-buried row embedded strain gauge and row's pressure cell before gob side entry retaining obturation pours, it is specific
Method: interval 40-60m select monitoring point, after filling template is set up, set up respectively in the middle part of filling space previous-next and
Two pack support steel wire of L-R, bracket fixation with steel wire need to be pulled firmly and be strained at directly on filling template skeleton, and both ends are bound jail
Gu；Embedded strain gauge is uniformly fixed on each two bracket steel wires of previous-next from center to interval 20-50cm with nylon rope
On, it is desirable that axix of strain gauge is in vertical direction；Pressure cell is uniformly fixed on from center to interval 20-50cm with nylon rope
On two bracket steel wires of L-R, it is desirable that pressure cell surface is horizontally oriented；Pressure cell axis and axix of strain gauge parallelly distribute on
In the middle part of gob side entry retaining obturation, 20-30cm is mutually staggered；Vaseline is smeared on surface after pressure cell is fixed, prevents material
Pressure cell surface is condensed in, data monitoring is influenced；
The strain gauge and pressure cell are fixed on bracket steel wire with nylon rope, prevent strain gauge and pressure cell in filling material
Mobile and deflection occurs when material casting；
(2) cable is drawn along bracket steel wire, is to bind cable on bracket steel wire, is punched and draw in filling template
Out, cable binds unsuitable tension, slightly relaxes；
(3) after body to be filled is poured 24 hours, bracket steel wire is removed from filling template, filling template can be in filling material
Material solidification is removed after 3 days；
(4) cable wire end plug is inserted into explosion-proof type intelligent reading instrument " INP " socket, passes through the button on readout instrument panel
And data display screen, it directly operates intelligent reading instrument and reads data, measurement for the first time starts to acquire after need to returning to zero to initial data
Signal, and real-time perfoming data save；
After gob side entry retaining obturation structure is formed, send special messenger that strain data is periodically measured and recorded, it is desirable that be
3 times a day, until back production terminates；
(5) computer is connected by " RS232 " socket on Portable explosion-proof type readout instrument, data is exported and protected
It deposits, the data of preservation is imported into Excel software, and draw strain-pressure curve, strain-pressure curve is obtained with pre-stage test
Stress-strain-pressure curve comparison is obtained, analyzes the stage locating for the obturation of each pressure cell corresponding position: when all pressure
When box data are in elastic-plastic phase, gob side entry retaining obturation has good stability；Rank after partial pressure box data enter destruction
Duan Shi, the local failure of gob side entry retaining obturation but whole holding are stablized；After all pressure cell data are in destruction when the stage,
Gob side entry retaining obturation overall collapse；
The pre-stage test obtains stress-strain-pressure curve method are as follows: pressure cell is embedded to 150mm*150mm*
It in 150mm obturation test specimen, water seasoning 28 days, is demarcated on electro-hydraulic servo press machine, obtains obturation stress-strain-pressure
Force curve, and carry out subregion to curve, the stage after obturation elastic stage, plastic stage, breakdown point, destruction that obtains corresponding answer
Change-pressure characteristic.
In above-mentioned monitoring method, the gob side entry retaining obturation internal modification amount is read by gob side entry retaining obturation internal strain-ga(u)ge unit
Number determines；According to the reading and location determination of pressure cell, pressure cell reading is obvious to be risen the plastic zone range, shows to fill herein
It fills out body and enters the plastic stage, the obturation in plastic zone keeps stablizing, and gob side entry retaining obturation has good stability；The destruction area
Range shows that obturation enters destruction herein when pressure cell reading is residual strength according to the reading and location determination of pressure cell
Stage loses stabilization, and when part obturation enters the stage after destruction, gob side entry retaining obturation integrally still maintains stable, works as destruction
When area's range expands to entire gob side entry retaining obturation, gob side entry retaining obturation integrally destroys unstability；The gob side entry retaining filling
The residual strength of body is pressure cell reading after gob side entry retaining obturation unstability, shows as the maximum value of pressure cell whole process reading,
Residual strength shows that gob side entry retaining obturation is destroyed after unstability still with certain bearing capacity.
In above-mentioned monitoring method, the pressure cell axis and axix of strain gauge parallelly distribute on are in gob side entry retaining obturation
Portion is spaced apart from each other 20-30cm, is that strain gauge and pressure cell influence each other in order to prevent.
The principle of monitoring method provided by the invention are as follows: 1. when gob side entry retaining obturation is in the elastic compression stage: with
Crush, obturation reduced overall, strain gauge reading be continuously increased, and pressure cell reading it is substantially zeroed, obturation is in
The elastic compression stage shows that gob side entry retaining obturation has good stability；2. when gob side entry retaining obturation enters plastic period
When: with crushing, strain gauge reading continues to increase, and pressure cell reading starts obvious rising, and obturation is in the plastic stage,
Show that gob side entry retaining obturation keeps stablizing herein；3. strain gauge reading increases to when gob side entry retaining obturation is destroyed
Peak value, pressure cell reading also start increased dramatically, and show that obturation occurs to destroy herein and lose stabilization；If top plate continues to sink,
Partial panels are destroyed by broken body support, strain gauge pressure release is failed, and reading decreases；Gob side entry retaining obturation reduced overall amount
Continue to increase, pressure cell reading is rapidly increased to peak value at destruction；Part obturation is in the stage after destruction, but gob side entry retaining fills
It fills out body and integrally keeps stable；4. gob side entry retaining obturation is destroyed completely if top plate continues to sink, strain gauge whole pressure release failure is read
Number reduces, and the pressure cell on the outside of band, which is read, to be reduced, and the pressure cell reading in the middle part of band reaches peak value and keeps, this
When pressure cell reading be the support force of the loose media that is formed after obturation is broken to top plate, gob side entry retaining obturation overall collapse.
Beneficial effects of the present invention:
The present invention uses invasive measurement means, can really reflect the strain of gob side entry retaining obturation internal stress, plastic zone
The size of development and residual stress；Using vibrating string extensometer and vibrating wire cell, easy for installation, insulation explosion-proof performance
Good, strong antijamming capability is transmitted undistorted at a distance, is suitable for monitoring for a long time in the adverse circumstances of underground；Using portable strain
Acquisition system, it is easy to carry, easy to operate, data are accurate；Monitoring principle is accurate and reliable, simple and clear, certainly convenient for engineering staff
Row determines.
Detailed description of the invention
Fig. 1 is gob side entry retaining obturation strain gauge and pressure cell distribution map.
Fig. 2 is the cross-sectional view in Fig. 1 along line A-A.
Fig. 3 is the cross-sectional view in Fig. 1 along line B-B.
The structural schematic diagram of the portable strain signal acquisition system of Fig. 4.
Fig. 5 strain gauge stationary state schematic diagram.
Fig. 6 pressure cell stationary state schematic diagram.
Fig. 7 stress-strain-pressure data analysis graph (unit MPa).
Wherein: the portable strain of 1. embedded strain gauge, 2. pressure cell, 3. bracket steel wire, 4. template, 5. cable 6.
7. gob side entry retaining of signal acquiring system, 8. nylon rope, 9. obturation compression strength curve, 10. pressure cell data and curves 11. are anti-
The operation of 14. protective cover of Compressive Strength peak value (breakdown point) 12. residual strength, 13. signal path, 15. computer interface 16. is pressed
17. data display screen of key, 18. charging jack 1. elastic stage 2. the plastic stage 3. destroy after the stage.
Specific embodiment
The present invention is further illustrated below by embodiment, but is not limited to following embodiment.
Embodiment 1:
It is a kind of monitoring the back production of gob side entry retaining obturation during stability system and method, including embedded strain gauge 1, pressure
Power box 2 and portable strain signal acquisition system 6；Pre-buried row embedded strain gauge 1 and a row in gob side entry retaining obturation
Pressure cell 2, embedded strain gauge 1 and pressure cell 2 are arranged in parallel, and embedded strain gauge 1 and pressure cell 2 pass through bracket steel wire respectively
3 is fixed；The end connecting cable of embedded strain gauge 1 and pressure cell 2, data connect portable strain signal by cable 5
Acquisition system 6；
1 built-in temperature sensor of embedded strain gauge influences the variation generated to ambient temperature and carries out temperature adjustmemt；
Each sensor internal has computing chip, is converted automatically to measurement data and directly exports physical quantity, and manual conversion is reduced
Fault and error；
The pressure cell 2 is manufactured using vibratory string Theoretical Design, using all-digital detection, the exciting in the way of pulse excitation；
The portable strain signal acquisition system 6 is explosion-proof type intelligent reading instrument；Pressure value and vibratory string can be directly displayed
Frequency, data connect explosion-proof type intelligent reading instrument " INP " socket by cable wire end plug；Explosion-proof type intelligent reading instrument is equipped with
" RS232 " computer interface 15, connect with computer 7 and exports data, and computer 7 is used to save and analyze portable strain letter
The data of preservation are imported Excel table, draw strain-pressue-graph, can analyze by the data that number acquisition system 6 acquires
Judge the stability of gob side entry retaining obturation.
In the present invention, the pressure cell 2 selects corresponding model according to different requirements, is equipped with portable strain signal acquisition
System can directly display pressure value, and can show vibratory string frequency, and measurement is intuitive, easy, quick；Measuring point temperature can directly be measured
Degree, and can be carried out temperature-compensating (temperature mode).
The size long 150mm, mid diameter 22mm of the embedded strain gauge 1；Range is 3000 μ ε, and measurement accuracy is
1 μ ε, use environment temperature: 80 DEG C of -20 DEG C~﹢, -20 DEG C~+125 DEG C of temperature range, sensitivity of thermometry is 0.25 DEG C.
There is protective cover 14 on the explosion-proof type intelligent reading instrument, have the function of dustproof and anti-explosion waterproof, there is " RS232 " calculating
Machine interface 15 can be connected export data and be saved with computer；And have operation button 16 and data display screen 17, it can directly operate
And read data.Charging jack 18 is additionally provided on explosion-proof type intelligent reading instrument.
The explosion-proof type intelligent reading instrument has 6 signal paths, can measure, deposit to 6 string wire sensors simultaneously
Store up 8000 strain datas.Explosion-proof type intelligent reading instrument has that detection speed is fast, measurement accuracy is high, easy to operate, small in size, again
Amount is light, power is low, using the time it is long, easy to carry the advantages that.
The cable 5 is four core shielded cables, and strain gauge and pressure cell are directly connected to portable strain by cable
The data of strain gauge and pressure cell are transmitted to portable strain signal acquisition system by signal acquiring system, carry out reading with after
Processing；The post-processing is to analyze the reading of portable strain signal acquisition system, judges gob side entry retaining obturation
Stability.
Illustrate the monitoring method using above-mentioned apparatus below by specific implementation process, comprising the following steps:
1, laboratory's calibration is carried out to pressure cell 2, obtains obturation stress-strain-pressure curve (Fig. 7)；The early period
Test obtains stress-strain-pressure curve method are as follows: pressure cell is embedded in 150mm*150mm*150mm obturation test specimen,
It water seasoning 28 days, is demarcated on electro-hydraulic servo press machine, obtains obturation stress-strain-pressure curve, and carry out to curve
Subregion obtains stage corresponding strain-pressure characteristic after obturation elastic stage, plastic stage, breakdown point, destruction.
2, with the propulsion of working face, filling template 4 is set up；
3, monitoring point is selected, sets up two pack support steel wire 3 of previous-next and L-R, two pack supports respectively in the middle part of filling space
3 parallel interval 30cm of steel wire, bracket steel wire 3 are fixed on 4 skeleton of filling template, need to firmly be pulled and be strained at directly, and both ends are bound
Securely；
4, embedded strain gauge 1 is uniformly fixed on two brackets up and down from center to interval 20-50cm with nylon rope 8
On steel wire 3, it is desirable that 1 axis of strain gauge is in vertical direction, and cable 5 is fixed on bracket steel wire 3 and extends to outside template 4, electricity
Cable 5 binds unsuitable tension, slightly relaxes, strain gauge 1 is numbered；
5, pressure cell 2 is uniformly fixed on to the two bracket steel wires 3 in left and right with nylon rope 8 from center to interval 20-50cm
On, it is desirable that 2 surface of pressure cell is horizontally oriented, and cable 5 is fixed on bracket steel wire 3 and extends to outside template 4, cable 5
Unsuitable tension is bound, slightly relaxes, pressure cell 2 is numbered；
6, the pouring filling material into template 4, after body to be filled is poured 24 hours, by bracket steel wire 3 from filling template 4
It removes, filling template 4 can remove after filler solidifies 3 days；
7, data acquisition is periodically carried out three times a day to connect 5 connector of cable and portable strain signal acquisition system 6
It connects, read and records；Start to acquire signal after returning to zero to initial data；Acquisition Instrument is connect with computer after returning to ground,
It carries out data export and saves；
8, the stability of gob side entry retaining obturation is analyzed and determined according to the collected data: the data of preservation are imported into Excel
Software, and strain-pressure curve is drawn, strain-pressure curve and pre-stage test are obtained into stress-strain-pressure curve and compared,
It analyzes the stage locating for the obturation of each pressure cell corresponding position: 1. in the stage, i.e., when pressure is less than 0.2MPa, illustrating this
Place's obturation is in elastic stage, and gob side entry retaining obturation has good stability；2. in the stage, i.e., pressure is less than greater than 0.2MPa
When 0.9MPa, illustrate that obturation enters the plastic stage herein, gob side entry retaining obturation is basicly stable；It 3., that is, is pressed when in the stage
When power is greater than 0.9MPa, illustrate that obturation has been destroyed herein；According to the position for being in the pressure cell of stage 2., obturation is judged
Plastic zone range；According to the position for being in the pressure cell of stage 3., the range of the destruction area of obturation is judged, when all pressure
Box all in the stage 3. position when, gob side entry retaining obturation integrally destroys unstability；Gob side entry retaining after gob side entry retaining obturation unstability
Still there is the residual strength of 3.1MPa in obturation center.
Claims (8)
1. the system of stability during a kind of monitoring gob side entry retaining obturation back production, it is characterised in that: including embedded strain gauge
With pressure cell, portable strain signal acquisition system；Pre-buried row embedded strain gauge and a row in gob side entry retaining obturation
Pressure cell, embedded strain gauge and pressure cell are arranged in parallel；Embedded strain gauge and pressure cell pass through bracket fixation with steel wire respectively；
The end connecting cable of embedded strain gauge and pressure cell, data are transferred to portable strain signal acquisition system by cable
System；
The embedded strain gauge built-in temperature sensor influences the variation generated to ambient temperature and carries out temperature adjustmemt；Each
Sensor internal has computing chip, is converted automatically to measurement data and directly exports physical quantity, and the mistake of manual conversion is reduced
Mistake and error；
The pressure cell is manufactured using vibratory string Theoretical Design, using all-digital detection, the exciting in the way of pulse excitation；
The portable strain signal acquisition system is explosion-proof type intelligent reading instrument；Data are connected explosion-proof by cable wire end plug
Type intelligent reading instrument " INP " socket；Explosion-proof type intelligent reading instrument is equipped with " RS232 " computer connection interface, can connect with computer
It connects export data and saves, the data of preservation are imported into Excel table, strain-pressue-graph is drawn, can analyze, are judged
The stability of gob side entry retaining obturation；
The pressure cell selects corresponding model according to different requirements, and the portable strain signal acquisition system of outfit can directly be shown
Show pressure value and vibratory string frequency, and can directly measure measuring point temperature, trip temperature of going forward side by side compensation；
Using the method for stability during above system monitoring gob side entry retaining obturation back production, comprising the following steps:
(1) it installs: pre-buried row embedded strain gauge and row's pressure cell before gob side entry retaining obturation pours, specific side
Method: interval 40-60m selectes monitoring point, after filling template is set up, sets up previous-next and a left side-respectively in the middle part of filling space
Right two pack support steel wires, bracket fixation with steel wire need to be pulled firmly and be strained at directly on filling template skeleton, and both ends are bound securely；
Embedded strain gauge is uniformly fixed on each two bracket steel wires of previous-next from center to interval 20-50cm with nylon rope,
Axix of strain gauge is asked to be in vertical direction；Pressure cell is uniformly fixed on L-R from center to interval 20-50cm with nylon rope
On two bracket steel wires, it is desirable that pressure cell surface is horizontally oriented；Pressure cell axis and axix of strain gauge parallelly distribute on are in edge
The middle part of the lane Kong Liu obturation, is spaced apart from each other 20-30cm；Vaseline is smeared on surface after pressure cell is fixed；
(2) cable is drawn along bracket steel wire, is by cable binding on bracket steel wire, and punching is drawn in filling template,
Cable binds unsuitable tension；
(3) after body to be filled is poured 24 hours, bracket steel wire is removed from filling template, filling template can be solidifying in filler
Gu being removed after 3 days；
(4) cable wire end plug is inserted into explosion-proof type intelligent reading instrument " INP " socket, passes through the button sum number on readout instrument panel
According to display screen, directly operating intelligent reading instrument and read data, measurement for the first time starts to acquire signal after need to returning to zero to initial data,
And real-time perfoming data save；
After gob side entry retaining obturation structure is formed carry out taken at regular intervals data, send special messenger strain data is periodically measured with
Record, it is desirable that for 3 times a day until back production twice terminates；
(5) computer is connected by " RS232 " socket on Portable explosion-proof type readout instrument, data is exported and saved,
The data of preservation are imported into Excel software, and draw strain-pressure curve, strain-pressure curve and pre-stage test are obtained
Stress-strain-pressure curve comparison, analyzes the stage locating for the obturation of each pressure cell corresponding position: when all pressure cells
When data are in elastic-plastic phase, gob side entry retaining obturation has good stability；Stage after partial pressure box data enter destruction
When, the local failure of gob side entry retaining obturation but integrally holding are stablized；After all pressure cell data are in destruction when the stage, edge
The lane Kong Liu obturation overall collapse.
2. the system of stability during monitoring gob side entry retaining obturation back production according to claim 1, it is characterised in that: institute
State the size long 150mm, mid diameter 22mm of embedded strain gauge；Range is 3000 μ ε, and measurement accuracy is 1 μ ε, uses ring
Border temperature: 80 DEG C of -20 DEG C~﹢, -20 DEG C~+125 DEG C of temperature range, sensitivity of thermometry is 0.25 DEG C.
3. the system of stability during monitoring gob side entry retaining obturation back production according to claim 1, it is characterised in that: institute
150% can be overloaded, use environment temperature with a thickness of 8mm, range 10MPa, precision 1kPa for 20mm by stating the diameter of pressure cell
Degree: 80 DEG C of -20 DEG C~﹢, -20 DEG C~+80 DEG C of temperature range, sensitivity of thermometry is 0.5 DEG C.
4. the system of stability during monitoring gob side entry retaining obturation back production according to claim 1, it is characterised in that: institute
Stating has protective cover on explosion-proof type intelligent reading instrument, readout instrument plane is equipped with operation button and data display screen, can directly operate
And read data.
5. the system of stability during monitoring gob side entry retaining obturation back production according to claim 1, it is characterised in that: institute
Stating explosion-proof type intelligent reading instrument has 6 signal paths, can measure simultaneously to 6 string wire sensors, store 8000 strains
Data.
6. the system of stability during monitoring gob side entry retaining obturation back production according to claim 1, it is characterised in that: institute
It states cable and portable strain signal acquisition system is directly connected to by cable for four core shielded cables, strain gauge and pressure cell
The data of strain gauge and pressure cell are transmitted to portable strain signal acquisition system, are read and post-processed by system.
7. the system of stability during monitoring gob side entry retaining obturation back production according to claim 1, it is characterised in that: institute
It states pre-stage test and obtains stress-strain-pressure curve method are as follows: pressure cell is cast in 150mm*150mm*150mm filling
In body test specimen, room temperature wet curing 28 days, it is bent to obtain obturation stress-strain-pressure for calibration of pressurizeing on electro-hydraulic servo press machine
Line, and carry out subregion to curve, the stage after obturation elastic stage, plastic stage, failure stage, destruction that obtains corresponding answer
Change-pressure characteristic.
8. the system of stability during monitoring gob side entry retaining obturation back production according to claim 1, it is characterised in that: institute
It states gob side entry retaining obturation internal modification amount and determination is read by gob side entry retaining obturation internal strain-ga(u)ge unit；According to the reading of pressure cell and
Location determination shows that obturation enters the plastic stage herein when pressure cell reading obviously rises, and the obturation in plastic zone is kept
Stablize, gob side entry retaining obturation has good stability；When pressure cell reading is residual strength, shows that obturation enters herein and destroy rank
Section loses stabilization, and when part obturation enters the stage after destruction, gob side entry retaining obturation integrally still maintains stable, works as destruction area
When range expands to entire gob side entry retaining obturation, gob side entry retaining obturation integrally destroys unstability；The residual strength is along sky
It stays pressure cell after the obturation unstability of lane to read, shows as the maximum value of pressure cell whole process reading, residual strength shows gob side entry retaining
Obturation, which is destroyed, still has certain bearing capacity after unstability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611012413.7A CN106643630B (en) | 2016-11-17 | 2016-11-17 | It is a kind of monitoring the back production of gob side entry retaining obturation during stability system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611012413.7A CN106643630B (en) | 2016-11-17 | 2016-11-17 | It is a kind of monitoring the back production of gob side entry retaining obturation during stability system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106643630A CN106643630A (en) | 2017-05-10 |
| CN106643630B true CN106643630B (en) | 2019-04-09 |
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| CN103528731A (en) * | 2013-10-25 | 2014-01-22 | 中国矿业大学 | Coal mine paste filler online monitoring system based on optical fiber grating sensing |
| CN105735375A (en) * | 2016-03-21 | 2016-07-06 | 长安大学 | Method and system for monitoring stability of loess tunnel bottom and construction method |
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| CN101949302B (en) * | 2010-09-17 | 2011-08-17 | 山东新矿赵官能源有限责任公司 | Dynamic monitoring method of roadway-beside filling body and tunnel roof of gob-side entry |
| CN103437814A (en) * | 2013-07-23 | 2013-12-11 | 新疆大学 | Gob-side entry retaining mine ground pressure monitoring system |
| CN104142187A (en) * | 2014-07-30 | 2014-11-12 | 冀中能源集团有限责任公司 | Gob-side entry retaining pasty filler on-line detection method |
| CN105509698A (en) * | 2014-09-26 | 2016-04-20 | 安徽金培因科技有限公司 | Novel embedded strain meter |
| CN104390861B (en) * | 2014-11-24 | 2016-11-23 | 山东科技大学 | A kind of experimental provision for testing gob side entry retaining stability and method of testing |
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| CN103528731A (en) * | 2013-10-25 | 2014-01-22 | 中国矿业大学 | Coal mine paste filler online monitoring system based on optical fiber grating sensing |
| CN105735375A (en) * | 2016-03-21 | 2016-07-06 | 长安大学 | Method and system for monitoring stability of loess tunnel bottom and construction method |
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