CN106643630A - System and method of monitoring stability during gob-side entry retaining filling body stoping period - Google Patents
System and method of monitoring stability during gob-side entry retaining filling body stoping period Download PDFInfo
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- CN106643630A CN106643630A CN201611012413.7A CN201611012413A CN106643630A CN 106643630 A CN106643630 A CN 106643630A CN 201611012413 A CN201611012413 A CN 201611012413A CN 106643630 A CN106643630 A CN 106643630A
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- China
- Prior art keywords
- obturation
- side entry
- entry retaining
- pressure cell
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention discloses a system and a method of monitoring the stability during a gob-side entry retaining filling body stoping period. The system comprises embedded strain gauges and pressure boxes, wherein a row of embedded strain gauges and a row of pressure boxes are embedded in the gob-side entry retaining filling body; the embedded strain gauges and the pressure boxes are arranged parallelly and are fixed by using support steel wires; end parts of the embedded strain gauges and the pressure boxes are connected with a cable; and data are transmitted to a portable strain signal acquisition system through the cable. An intervention measurement means is adopted, and the stress-strain inside the gob-side entry retaining filling body, the development condition in a plastic zone and the residual stress can be reflected; as the vibrating-wire strain gauges and the pressure boxes are adopted, the mounting is convenient, the insulation explosion-proof performance is strong, long-distance transmission is undistorted, and the system and the method are applicable to long-term monitoring in a downhole abominable environment.
Description
Technical field
The present invention relates to it is a kind of monitoring gob side entry retaining obturation back production during stability system and method, belong to mining neck
Domain.
Background technology
Gob side entry retaining, i.e., 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 has that resource recovery is high, Linking up digging rationally, tunnel pick
Enter 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 undergo 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：One is to control the directly absciss layer on top and cut off the direct top of mined out side and the next base object model in time, to subtract
The deformation of load and roadway surrounding rock suffered by few support in mine gateway；Two is timely close the goaf, prevents from leaking out and sends out naturally with float coal
Fire.
STABILITY MONITORING of the gob side entry retaining obturation during 2 back production include obturation deflection, plastic zone scope and
Core space intensity.Due to the complexity of underground mining environment, disturbing factor is more during monitoring, is used for still without effective method at present
Stability during monitoring gob side entry retaining 2 back production of obturation.
The content of the invention
The present invention is intended to provide it is a kind of monitoring gob side entry retaining obturation back production during stability system and method, it is adaptable to
Filling mining field.
The system and method for stability, are staying along sky during a kind of monitoring gob side entry retaining obturation back production that the present invention is provided
The internal pre-buried row embedded strain gauge of lane filling and row's pressure cell, data are by long cable transmission to portable strain signal
Acquisition system, to gob side entry retaining obturation stability long term monitoring is carried out.Embedded strain gauge is used for real-time monitoring gob side entry retaining
The internal modification of obturation, pressure cell is used for real-time monitoring gob side entry retaining obturation inside plastic zone（Destruction area）Scope and edge
Kong Liu lanes obturation residual strength, both combine the stability to gob side entry retaining obturation and are monitored；Portable strain signal
Acquisition system carries out taken at regular intervals and record to Monitoring Data, then by computer the data for recording is preserved and divided
Analysis.
The gob side entry retaining obturation is rectangular structure, and length is face length, and width is according to overburden pressure
Determine with filler bearing capacity, be highly working face mining height；The material for using is concrete material, paste filling material, cash
Stone cemented filling material,（It is super）One or more of high water filling material；
The invention provides it is a kind of monitoring gob side entry retaining obturation back production during stability system, including embedded strain gauge,
Pressure cell and portable strain signal acquisition system；In gob side entry retaining filling pre-buried row embedded strain gauge and a row pressure in vivo
Power box, embedded strain gauge and pressure cell be arranged in parallel；Embedded strain gauge and pressure cell pass through respectively support fixation with steel wire；Bury
Enter the end connection cable of formula strain gauge and pressure cell, by the portable strain signal acquisition system of cable connection；
The embedded strain gauge built-in temperature sensor, the change that to external world temperature impact is produced carries out temperature adjustmemt；Each
Sensor internal has computing chip, measurement data is converted and exports automatically and directly physical quantity, reduces the mistake of manual conversion
Miss and error；
The pressure cell is manufactured using vibratory string Theoretical Design, using all-digital detection, using pulse excitation mode exciting；
The portable strain signal acquisition system is explosion-proof type intelligent reading instrument；Pressure value and vibratory string frequency can be directly displayed,
Data connect explosion-proof type intelligent reading instrument " INP " socket by cable wire end plug；Explosion-proof type intelligent reading instrument is provided with " RS232 "
Computer connection interface, derivation is connected with computer and data and is preserved, and the data for preserving are imported into Excel forms, draw strain-
Pressue-graph, you can be analyzed, judges the stability of gob side entry retaining obturation.
In above-mentioned system, the pressure cell requires to select corresponding model according to different, is equipped with portable strain signal
Acquisition system can directly display pressure value, and vibratory string frequency can be shown again, and measurement is directly perceived, easy, quick；Measuring point can directly be measured
Temperature, and temperature-compensating can be carried out（Temperature mode）.
Further, the embedded strain gauge, the long 150mm of size, mid diameter is 22mm, and 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 is 0.25
℃。
Further, the pressure cell, a diameter of 20mm, thickness is 8mm, and range is 10MPa, and precision is 1kPa, can mistake
150% is carried, 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, the function with dustproof and anti-explosion waterproof has calculating
Machine interface, can connect and derive data with computer；And have operation button and data display screen, can directly operate and receive data
According to.
Further, the explosion-proof type intelligent reading instrument has 6 signalling channels, and 6 string wire sensors can be entered simultaneously
Row measurement, stores 8000 strain datas.Explosion-proof type intelligent reading instrument has that detection speed is fast, certainty of measurement is high, it is simple to operate,
Small volume, lightweight, power are low, use time length, it is easy to carry the advantages of.
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, by the data transfer of strain gauge and pressure cell to portable strain signal acquisition system, is carried out
Reading and post processing；The post processing is to be analyzed the reading of portable strain signal acquisition system, judges gob side entry retaining
The stability of obturation.
The invention provides it is a kind of monitoring gob side entry retaining obturation back production during stability method, using above-mentioned monitoring edge
The system and method for stability, comprise the following steps during the obturation back production of Kong Liu lanes：
（1）Install：Pre-buried row embedded strain gauge and row's pressure cell, its concrete side before gob side entry retaining obturation is poured
Method：Interval 40-60m selectes monitoring point, after filling template is set up and is finished, set up respectively in the middle part of filling space previous-next and left-
Right two pack support steel wires, support fixation with steel wire need to firmly be pulled and strained at directly on filling template skeleton, and two ends colligation is firm；
Embedded strain gauge is outwards spaced into 20-50cm by center with nylon rope to be uniformly fixed on each two support steel wires of previous-next,
Axix of strain gauge is asked to be in vertical direction；Pressure cell is outwards spaced into 20-50cm by center with nylon rope and is uniformly fixed on L-R
On two support steel wires, it is desirable to which pressure cell surface is horizontally oriented；Pressure cell axis is parallel with axix of strain gauge to be distributed in edge
The middle part of Kong Liu lanes obturation, mutually stagger 20-30cm；In surface smear vaseline after pressure cell fixation, condensation of materials is prevented
On pressure cell surface, data monitoring is affected；
The strain gauge and pressure cell nylon rope are fixed on support steel wire, prevent strain gauge and pressure cell from pouring in filler
It is moved during note and deflects；
（2）Cable is drawn along support steel wire, is that by cable colligation on support steel wire, the punching in filling template is drawn,
The unsuitable tension of cable colligation, slightly relaxes；
（3）After body to be filled is poured into a mould 24 hours, support steel wire is pulled down from filling template, filling template can be solidifying in filler
Gu remove after 3 days；
（4）Cable wire end plug is inserted into explosion-proof type intelligent reading instrument " INP " socket, by the button sum on readout instrument panel
According to display screen, directly operate intelligent reading instrument and read data, measurement first starts to gather signal after need to returning to zero initial data,
And carry out data preservation in real time；
After gob side entry retaining obturation structure is formed, special messenger is sent periodically to measure and record strain data, it is desirable to for daily 3
It is secondary, until back production terminates；
（5）Computer is connected into by " RS232 " socket on Portable explosion-proof type readout instrument, data is derived and preserved,
The data for preserving are imported into Excel softwares, and draws strain-pressure curve, strain-pressure curve and pre-stage test are answered
Power-strain-pressure curve contrast, analyzes the stage residing for the obturation of each pressure cell correspondence position：When all pressure cell numbers
During according to being in elastic-plastic phase, gob side entry retaining obturation has good stability；When the stage after partial pressure box data enter destruction,
The local failure of gob side entry retaining obturation but integrally holding are stable；When the stage after all pressure cell data are in destruction, along empty
Stay lane obturation overall collapse；
The pre-stage test obtains the method for stress-strain-pressure curve：Pressure cell is imbedded into 150mm*150mm*150mm
In obturation test specimen, water seasoning 28 days is demarcated on electro-hydraulic servo forcing press, obtains obturation stress-strain-pressure bent
Line, and subregion is carried out to curve, obtain stage corresponding strain after obturation elastic stage, plastic stage, breakdown point, destruction-
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；The plastic zone scope substantially rises, shows to fill herein according to the reading and location determination of pressure cell, pressure cell reading
Fill out body and enter the plastic stage, the obturation in plastic zone keeps stable, and gob side entry retaining obturation has good stability；The destruction area
Scope when pressure cell reading is residual strength, shows that herein obturation enters destruction according to the reading and location determination of pressure cell
Stage loses stable, and when part obturation enters the stage after destruction, gob side entry retaining obturation is integrally remained in that to be stablized, and works as destruction
When area's scope expands to whole 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 of pressure cell whole process reading,
Residual strength shows still there is certain bearing capacity after gob side entry retaining obturation destruction unstability.
In above-mentioned monitoring method, the pressure cell axis is parallel with axix of strain gauge to be distributed in gob side entry retaining obturation
Portion, spaced 20-30cm is to prevent strain gauge and pressure cell from influencing each other.
The principle of monitoring method that the present invention is provided is：1. when gob side entry retaining obturation is in the elastic compression stage：With
And crush, obturation reduced overall, strain gauge reading is continuously increased, and pressure cell reading is substantially zeroed, and obturation is in
In the elastic compression stage, show 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 substantially rising, and obturation is in the plastic stage,
Show that herein gob side entry retaining obturation keeps stable；3. when gob side entry retaining obturation is destroyed, strain gauge reading is increased to
Peak value, pressure cell reading also begins to be increased dramatically, and shows that the destruction of obturation generation herein loses stable；If top board continues to sink,
Destruction partial panels are supported by broken body, and strain gauge pressure release failure, 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
Fill out body and integrally keep stable；If 4. top board continues to sink, gob side entry retaining obturation is destroyed completely, and strain gauge whole pressure release failure is read
Number is reduced, and the pressure cell reading on the outside of band reduces, and the pressure cell reading in the middle part of band reaches peak value and keeps, this
When pressure cell reading be obturation it is broken after the support force of the loose media that formed to top board, gob side entry retaining obturation overall collapse.
Beneficial effects of the present invention：
The present invention adopts invasive measurement means, can truly reflect the strain of gob side entry retaining obturation internal stress, plastic zone development
The size of situation and residual stress；Using vibrating string extensometer and vibrating wire cell, easy for installation, insulation explosion-proof performance is good,
Strong antijamming capability, long-distance transmissions are undistorted, suitably monitor for a long time in the adverse circumstances of down-hole；Using portable strain acquirement
System, easy to carry, simple to operate, data are accurate；Monitoring principle accurately and reliably, it is simple and clear, be easy to engineering staff voluntarily to sentence
It is fixed.
Description of the drawings
Fig. 1 is gob side entry retaining obturation strain gauge and pressure cell distribution map.
Fig. 2 is along the sectional view of line A-A in Fig. 1.
Fig. 3 is along the sectional view of line B-B in Fig. 1.
The structural representation of the portable strain signal acquisition systems of Fig. 4.
Fig. 5 strain gauge stationary state schematic diagrames.
Fig. 6 pressure cell stationary state schematic diagrames.
Fig. 7 stress-strains-pressure data analysis graph（Unit is MPa）.
Wherein：1. the portable strain of 2. pressure cell of embedded strain gauge, 3. support steel wire, 4. template, 5. cable 6.
The pressure cell data and curves 11. of 7. gob side entry retaining of signal acquiring system, 8. nylon rope, 9. obturation compression strength curve 10. resist
Compressive Strength peak value（Breakdown point）The operation of 12. residual strength, 13. signalling channel, 14. protective cover, 15. computer interface 16. is pressed
The charging socket of 17. data display screen of key 18. 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 examples.
Embodiment 1：
The system and method for stability during a kind of monitoring gob side entry retaining obturation back production, including embedded strain gauge 1, pressure cell
2 and portable strain signal acquisition system 6；In the internal pre-buried row embedded strain gauge 1 of gob side entry retaining filling and a row pressure power
Box 2, embedded strain gauge 1 and pressure cell 2 be arranged in parallel, and embedded strain gauge 1 and pressure cell 2 are solid by support steel wire 3 respectively
It is fixed；The end connection cable of embedded strain gauge 1 and pressure cell 2, data connect portable strain signal collection by cable 5
System 6；
The built-in temperature sensor of the embedded strain gauge 1, the change that to external world temperature impact is produced carries out temperature adjustmemt；Each
Sensor internal has computing chip, measurement data is converted and exports automatically and directly physical quantity, reduces the mistake of manual conversion
Miss and error；
The pressure cell 2 is manufactured using vibratory string Theoretical Design, using all-digital detection, using pulse excitation mode exciting；
The portable strain signal acquisition system 6 is explosion-proof type intelligent reading instrument；Pressure value and vibratory string frequency can be directly displayed,
Data connect explosion-proof type intelligent reading instrument " INP " socket by cable wire end plug；Explosion-proof type intelligent reading instrument is provided with " RS232 "
Computer interface 15, is connected and derives data with computer 7, and computer 7 is used for preserving and analyzing portable strain signal collection
The data for preserving are imported Excel forms by the data of the collection of system 6, draw strain-pressue-graph, you can analysis judges edge
The stability of Kong Liu lanes obturation.
In the present invention, the pressure cell 2 requires to select corresponding model according to different, is equipped with portable strain signal collection
System can directly display pressure value, and vibratory string frequency can be shown again, and measurement is directly perceived, easy, quick；Measuring point temperature can directly be measured
Degree, and temperature-compensating can be carried out（Temperature mode）.
The long 150mm of size of the embedded strain gauge 1, mid diameter is 22mm；Range is 3000 μ ε, and certainty of measurement 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, the function with dustproof and anti-explosion waterproof has " RS232 " to calculate
Machine interface 15, can derive data and preserve with computer connection；And have operation button 16 and data display screen 17, can directly operate
And read data.Charging socket 18 is additionally provided with explosion-proof type intelligent reading instrument.
The explosion-proof type intelligent reading instrument has 6 signalling channels, and 6 string wire sensors can be measured simultaneously, deposits
8000 strain datas of storage.Explosion-proof type intelligent reading instrument has that detection speed is fast, certainty of measurement is high, simple to operate, small volume, weight
Amount is light, low power, use time length, it is easy to carry the advantages of.
The cable 5 is four core shielded cables, and strain gauge and pressure cell are directly connected to portable strain by cable
Signal acquiring system, by the data transfer of strain gauge and pressure cell to portable strain signal acquisition system, carry out reading and after
Process；The post processing is to be analyzed the reading of portable strain signal acquisition system, judges gob side entry retaining obturation
Stability.
Below by the explanation of specific implementation process using the monitoring method of said apparatus, comprise the following steps：
1st, laboratory's demarcation is carried out to pressure cell 2, obtains obturation stress-strain-pressure curve（Fig. 7）；The pre-stage test
Obtain stress-strain-pressure curve method be：Pressure cell is imbedded in 150mm*150mm*150mm obturation test specimens, is watered
Maintenance 28 days, demarcates on electro-hydraulic servo forcing press, obtains obturation stress-strain-pressure curve, and curve is carried out point
Area, obtains the corresponding strain-pressure characteristic of stage after obturation elastic stage, plastic stage, breakdown point, destruction.
2nd, with the propulsion of working face, filling template 4 is set up；
3rd, monitoring point is selected, sets up previous-next and the pack support steel wire 3 of L-R two, two pack support steel wires respectively in the middle part of filling space
3 parallel intervals 30cm, support steel wire 3 is fixed on the skeleton of filling template 4, need to firmly be pulled and be strained at directly, and two ends colligation is firm；
4th, embedded strain gauge 1 is outwards spaced into 20-50cm by center with nylon rope 8 and is uniformly fixed on upper and lower two support steel wires
On 3, it is desirable to which the axis of strain gauge 1 is in vertical direction, cable 5 is fixed on support steel wire 3 and extends to outside template 4, cable 5
The unsuitable tension of colligation, slightly relaxes, and strain gauge 1 is numbered；
5th, pressure cell 2 is outwards spaced into 20-50cm by center with nylon rope 8 to be uniformly fixed on the two support steel wires 3 in left and right,
The surface of pressure cell 2 is asked to be horizontally oriented, cable 5 is fixed on support steel wire 3 and extends to outside template 4, and the colligation of cable 5 is not
Preferably tension, slightly relaxes, and pressure cell 2 is numbered；
6th, to pouring filling material in template 4, after body to be filled is poured into a mould 24 hours, support steel wire 3 is torn open from filling template 4
Under, filling template 4 can be removed after filler solidifies 3 days；
7th, data acquisition is periodically carried out, three times a day, the joint of cable 5 is connected with portable strain signal acquisition system 6,
Reading is simultaneously recorded；To starting to gather signal after initial data zeroing；Return and be connected Acquisition Instrument with computer behind ground, enter line number
According to derivation and preservation；
8th, the stability of gob side entry retaining obturation is judged according to the data analysis of collection：The data for preserving are imported into Excel softwares,
And strain-pressure curve is drawn, strain-pressure curve and pre-stage test are obtained into stress-strain-pressure curve contrast, analysis
Stage residing for the obturation of each pressure cell correspondence position：In the stage 1., i.e., when pressure is less than 0.2MPa, illustrate to fill herein
Body is filled out in elastic stage, gob side entry retaining obturation has good stability；In the stage 2., i.e., pressure is less than more than 0.2MPa
During 0.9MPa, illustrate that herein obturation enters the plastic stage, gob side entry retaining obturation is basicly stable；3., that is, press when in the stage
When power is more than 0.9MPa, illustrate that herein obturation has been destroyed；According to the position in stage pressure cell 2., obturation is judged
Plastic zone scope；According to the position in stage pressure cell 3., the scope in 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 obturation center.
Claims (10)
1. it is a kind of monitoring gob side entry retaining obturation back production during stability system, it is characterised in that：Including embedded strain gauge
With pressure cell, portable strain signal acquisition system；In the internal pre-buried row embedded strain gauge of gob side entry retaining filling and a row
Pressure cell, embedded strain gauge and pressure cell be arranged in parallel；Embedded strain gauge and pressure cell pass through respectively support fixation with steel wire；
The end connection cable of embedded strain gauge and pressure cell, data are transferred to portable strain signal collection system by cable
System；
The embedded strain gauge built-in temperature sensor, the change that to external world temperature impact is produced carries out temperature adjustmemt；Each
Sensor internal has computing chip, measurement data is converted and exports automatically and directly physical quantity, reduces the mistake of manual conversion
Miss and error；
The pressure cell is manufactured using vibratory string Theoretical Design, using all-digital detection, using pulse excitation mode exciting；
The portable strain signal acquisition system is explosion-proof type intelligent reading instrument；Data connect explosion-proof by cable wire end plug
Type intelligent reading instrument " INP " socket；Explosion-proof type intelligent reading instrument is provided with " RS232 " computer connection interface, can connect with computer
Connect derivation data and preserve, the data for preserving are imported into Excel forms, draw strain-pressue-graph, you can analysis, judge
The stability of gob side entry retaining obturation.
2. it is according to claim 1 monitoring gob side entry retaining obturation back production during stability system, it is characterised in that：Institute
State pressure cell and require that, from corresponding model, the portable strain signal acquisition system of outfit can directly display pressure according to different
Value and vibratory string frequency, and measuring point temperature can be directly measured, trip temperature of going forward side by side compensation.
3. it is according to claim 1 monitoring gob side entry retaining obturation back production during stability system, it is characterised in that：Institute
The long 150mm of size of embedded strain gauge is stated, mid diameter is 22mm；Range is 3000 μ ε, and certainty of measurement is 1 μ ε, using 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.
4. it is according to claim 1 monitoring gob side entry retaining obturation back production during stability system, it is characterised in that：Institute
A diameter of 20mm of pressure cell is stated, thickness is 8mm, and range is 10MPa, and precision is 1kPa, can transship 150%, use environment temperature
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.
5. it is according to claim 1 monitoring gob side entry retaining obturation back production during stability system, it is characterised in that：Institute
Stating has protective cover on explosion-proof type intelligent reading instrument, readout instrument plane is provided with operation button and data display screen, can directly operate
And read data.
6. it is according to claim 1 monitoring gob side entry retaining obturation back production during stability system, it is characterised in that：Institute
Stating explosion-proof type intelligent reading instrument has 6 signalling channels, and 6 string wire sensors can be measured simultaneously, stores 8000 strains
Data.
7. it is according to claim 1 monitoring gob side entry retaining obturation back production during stability system, it is characterised in that：Institute
State cable and portable strain signal collection system is directly connected to by cable for four core shielded cables, strain gauge and pressure cell
System, by the data transfer of strain gauge and pressure cell to portable strain signal acquisition system, carries out reading and post processing.
8. it is a kind of monitoring gob side entry retaining obturation back production during stability method, using described in any one of claim 1 ~ 7
The system of stability during monitoring gob side entry retaining obturation back production, it is characterised in that：
（1）Install：Pre-buried row embedded strain gauge and row's pressure cell, its concrete side before gob side entry retaining obturation is poured
Method：Interval 40-60m selectes monitoring point, after filling template is set up and is finished, set up respectively in the middle part of filling space previous-next and left-
Right two pack support steel wires, support fixation with steel wire need to firmly be pulled and strained at directly on filling template skeleton, and two ends colligation is firm；
Embedded strain gauge is outwards spaced into 20-50cm by center with nylon rope to be uniformly fixed on each two support steel wires of previous-next,
Axix of strain gauge is asked to be in vertical direction；Pressure cell is outwards spaced into 20-50cm by center with nylon rope and is uniformly fixed on L-R
On two support steel wires, it is desirable to which pressure cell surface is horizontally oriented；Pressure cell axis is parallel with axix of strain gauge to be distributed in edge
The middle part of Kong Liu lanes obturation, spaced 20-30cm；In surface smear vaseline after pressure cell fixation；
（2）Cable is drawn along support steel wire, is that by cable colligation on support steel wire, the punching in filling template is drawn,
The unsuitable tension of cable colligation；
（3）After body to be filled is poured into a mould 24 hours, support steel wire is pulled down from filling template, filling template can be solidifying in filler
Gu remove after 3 days；
（4）Cable wire end plug is inserted into explosion-proof type intelligent reading instrument " INP " socket, by the button sum on readout instrument panel
According to display screen, directly operate intelligent reading instrument and read data, measurement first starts to gather signal after need to returning to zero initial data,
And carry out data preservation in real time；
Carry out taken at regular intervals data after gob side entry retaining obturation structure is formed, send special messenger strain data is periodically measured and
Record, it is desirable to for three times a day until back production twice terminates；
（5）Computer is connected into by " RS232 " socket on Portable explosion-proof type readout instrument, data is derived and preserved,
The data for preserving are imported into Excel softwares, and draws strain-pressure curve, strain-pressure curve and pre-stage test are obtained
Stress-strain-pressure curve contrast, analyzes the stage residing for the obturation of each pressure cell correspondence 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 are entered to be destroyed
When, the local failure of gob side entry retaining obturation but integrally holding are stable；When the stage after all pressure cell data are in destruction, edge
Kong Liu lanes obturation overall collapse.
9. it is according to claim 8 monitoring gob side entry retaining obturation back production during stability method, it is characterised in that：Institute
State pre-stage test obtain stress-strain-pressure curve method be：Pressure cell is cast in into 150mm*150mm*150mm fillings
In body test specimen, normal temperature wet curing 28 days, the pressurization on electro-hydraulic servo forcing press is demarcated, and obtains obturation stress-strain-pressure bent
Line, and subregion is carried out to curve, obtain the stage after obturation elastic stage, plastic stage, failure stage, destruction it is corresponding should
Change-pressure characteristic.
10. it is according to claim 8 monitoring gob side entry retaining obturation back production during stability method, it is characterised in that：
The gob side entry retaining obturation internal modification amount is determined by gob side entry retaining obturation internal strain-ga(u)ge unit reading；According to the reading of pressure cell
And location determination, when pressure cell reading substantially rises, showing that herein obturation enters the plastic stage, the obturation in plastic zone is protected
It is fixed to keep steady, and gob side entry retaining obturation has good stability；When pressure cell reading is residual strength, show that herein obturation enters destruction
Stage loses stable, and when part obturation enters the stage after destruction, gob side entry retaining obturation is integrally remained in that to be stablized, and works as destruction
When area's scope expands to whole gob side entry retaining obturation, gob side entry retaining obturation integrally destroys unstability；The residual strength is edge
Pressure cell reading after the obturation unstability of Kong Liu lanes, shows as the maximum of pressure cell whole process reading, and residual strength shows to be stayed along sky
Still there is certain bearing capacity after the obturation destruction unstability of lane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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