CN106705902A - System and method for monitoring stability of filling strip - Google Patents
System and method for monitoring stability of filling strip Download PDFInfo
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- CN106705902A CN106705902A CN201611012437.2A CN201611012437A CN106705902A CN 106705902 A CN106705902 A CN 106705902A CN 201611012437 A CN201611012437 A CN 201611012437A CN 106705902 A CN106705902 A CN 106705902A
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- strain
- pressure cell
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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
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/04—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string
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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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- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a system and a method for monitoring the stability of a filling strip. The system comprises embedded strain meters and pressure boxes; a row of embedded strain meters and a row of pressure boxes are embedded into the filling strip, and the embedded strain meters and the pressure boxes are arranged in parallel and fixed via support wires respectively; the ends of the embedded strain meters and the pressure boxes are connected with each other, and data is transmitted to a ground strain signal real-time acquisition system via a long cable; the ground strain signal real-time acquisition system is composed of a multi-channel vibrating wire signal acquisition instrument and a computer; the vibrating wire signal acquisition instrument is provided with a plurality of signal channels for receiving strain signals; and data is inserted into the vibrating wire signal acquisition instrument via a cable end plug. By adopting an interventional measurement means, stress and strain inside the filling strip, development situation of a plastic zone and magnitude of residual stress are reflected; and by adopting the vibrating wire strain meters and the pressure boxes, the system is convenient to install, good in insulation and explosion resistance, strong in anti-interference capability and free from distortion in long-distance transmission, and is suitable for long-term monitoring in underground severe environments.
Description
Technical field
The present invention relates to a kind of system and method for monitoring filling band stability, belong to field of mining.
Background technology
It is control subsidence in subterranean resource recovery process, preserves the ecological environment, the mode of selection filling mining
Carry out underground mineral resources exploitation.With the development of filling mining, available filler is increasingly reduced, and causes filling cost
Increasingly increase, all the pressure of filling increasingly increases, in this case, part filling is suggested and applies, including bar
Band filling.Filling band is that the coal column for setting is stayed with strip filling body displacement Striping noise, as long as ensureing the width in unfilled goaf
Degree is less than the first breaking span of overlying strata main key stratum, overlying strata main key stratum structure remained stable, and filling band can keep long
Phase stabilization, so that it may effectively control subsidence.But, compared with all fillings, though strip filling has saved filler, reduce
Filling cost, but the long-time stability of filling band need to be investigated.The long-time stability monitoring for filling band includes deformation
Amount, plastic zone scope and core space intensity.Due to the complexity of underground mining environment, disturbing factor is more during monitoring, does not have still at present
There is effective method for monitoring the stability of filling band.
The content of the invention
The present invention is intended to provide a kind of system and method for monitoring filling band stability, it is adaptable to filling mining field.
The system that a kind of monitoring that the present invention is provided fills band stability, pre-buried row flush type should in filling band
Become meter and row's pressure cell, strain signal real-time acquisition system be equipped with ground, data by cable transmission long, to filling band
Stability carries out long term monitoring.Embedded strain gauge is used for the internal modification that real-time monitoring fills band, and pressure cell is used for real-time
Monitoring filling interior strips plastic zone（Destruction area）Scope and filling band residual strength, both combine to filling band it is steady
It is qualitative to be monitored；Ground strain signal real-time acquisition system carries out Real-time Collection to Monitoring Data with analysis.
The filling band is rectangular structure, and length is face length, and width is according to overburden pressure and filling
Material bearing capacity determines, is highly working face mining height；The material for using is cementing concrete material, paste filling material, spoil
Filler,（It is super）One or more of high water filling material；
The invention provides a kind of system for monitoring filling band stability, including embedded strain gauge, pressure cell and ground should
Varying signal Real-time Collection analysis system；Pre-buried row embedded strain gauge and row's pressure cell in filling band, flush type should
Become meter and pressure cell be arranged in parallel；Embedded strain gauge and pressure cell pass through support fixation with steel wire respectively；Ground is equipped with ground
The end connection cable of strain signal real-time acquisition system, embedded strain gauge and pressure cell, data are arrived by cable transmission long
The strain signal real-time acquisition system on ground；
The embedded strain gauge built-in temperature sensor, the change that temperature influence is produced to external world 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 ground strain signal real-time acquisition system is made up of multichannel vibratory string signal sampler and computer；Vibratory string signal is adopted
Collection instrument has multiple signalling channels for receiving strain signal；Data insert vibratory string signal sampler by cable wire end plug
" INP " socket is connected to data collecting system；Computer is used for preserving and analyzing the data of vibratory string signal sampler collection, uses
The strain testing analysis system software kit installed on computer is controlled to multi-channel signal acquiring instrument, and to Monitoring Data
It is acquired and imports Excel forms, draw strain-pressue-graph, you can be analyzed, sentence with preservation, the data that will be preserved
The stability of disconnected filling band.
In above-mentioned system, the pressure cell requires to select corresponding model according to different, is equipped with multichannel vibratory string signal
The static state and kinetic parameter of Acquisition Instrument measurement structure body, such as：Strain value, pressure value, the natural frequency of vibration, resistance coefficient, the coefficient of impact,
Vibration shape etc.；Measuring point temperature can be directly measured, and temperature-compensating can be carried out（Temperature mode）.
Further, the embedded strain gauge, size 150mm long, mid diameter is 22mm, and range is 3000 μ ε, is surveyed
Accuracy 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
℃。
Further, the pressure cell, a diameter of 20mm, thickness is 8mm, and range is 10MPa, and precision is 1kPa, can mistake
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, the multichannel vibratory string signal detecting and measuring apparatus each have 20 signalling channels, can simultaneously gather 20 and shake
String formula strain signal, when monitoring signals are more than 20, sets multiple Acquisition Instrument series connection.
Further, the cable is four core shielded cables, and cable distribution will be strained by filler transfer passage
To ground strain signal real-time acquisition system, its transmission range can reach 3000m to the data transfer of meter and pressure cell.
The invention provides a kind of method for monitoring filling band stability, using above-mentioned monitoring filling band stability
System, comprises the following steps：
（1）Install：Pre-buried row embedded strain gauge and row's pressure cell, its specific method before filling band is poured：Interval
40-60m selectes monitoring point, after filling template is set up and finished, sets up two groups of previous-next and L-R respectively in the middle part of filling space
Support steel wire, support fixation with steel wire need to firmly be pulled and strained at directly on filling template skeleton, and two ends colligation is firm；Use nylon
Embedded strain gauge is outwards spaced 20-50cm and is uniformly fixed on each two support steel wires of previous-next by rope by center, it is desirable to strained
Meter shaft line is in vertical direction；Pressure cell is outwards spaced 20-50cm by center with nylon rope and is uniformly fixed on two branch of L-R
On frame steel wire, 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 filling band
Middle part, mutually stagger 20-30cm；In surface smear vaseline after pressure cell fixation, condensation of materials is prevented on pressure cell surface,
Influence data monitoring；
The strain gauge and pressure cell nylon rope are fixed on support steel wire, prevent strain gauge and pressure cell from being poured in filler
It is moved during note and is deflected；
（2）Cable is drawn along support steel wire, is by cable colligation on support steel wire, to be punched in filling template and 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 removed after 3 days；
（4）Cable wire end plug is inserted into multi-channel signal acquiring instrument " INP " socket, and Acquisition Instrument is connected with computer, opened
The strain testing analysis system software installed on computer, starts to gather signal, and carry out data in real time after returning to zero initial data
Preserve；
（5）The data that will be preserved import Excel softwares, and draw strain-pressure curve, and strain-pressure curve and early stage are tried
Acquisition stress-strain-pressure curve contrast is tested, the stage residing for the obturation of each pressure cell correspondence position is analyzed：When all
When pressure cell data are in elastic-plastic phase, filling band has good stability；Stage after partial pressure box data enter to be destroyed
When, fill band local failure but overall holding stabilization；When the stage after all pressure cell data are in destruction, band is filled
Overall collapse；
The method that the pre-stage test obtains stress-strain-pressure curve is：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, portion's deflection is determined by strain gauge reading in strip filling body in the strip filling body；
The plastic zone scope substantially rises according to the reading and location determination of pressure cell, pressure cell reading, shows that obturation is entered herein
Enter the plastic stage, the obturation in plastic zone keeps stabilization, filling band has good stability；Destruction area scope is according to pressure
The reading and location determination of box, when pressure cell reading is residual strength, show that obturation loses stabilization into failure stage herein,
Part obturation is entirely filled into during the stage, filling band integrally remains in that stabilization after destruction when destruction area's scope is expanded to
When filling out band, filling band integrally destroys unstability；The residual strength of the filling band is pressure cell after filling band unstability
Reading, show as pressure cell whole process reading maximum, residual strength show filling band destruction unstability after still have it is certain
Bearing capacity.
In above-mentioned monitoring method, the pressure cell axis middle part for being distributed in filling band parallel with axix of strain gauge, phase
Mutually interval 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 band is filled in the elastic compression stage：With top board
Sink, obturation reduced overall, strain gauge reading is continuously increased, and pressure cell reading is substantially zeroed, obturation is in elasticity and presses
In the contracting stage, show that filling band has good stability；2. when band is filled into plastic period：With crushing, should
Become meter reading to continue to increase, pressure cell reading starts substantially rising, obturation is in the plastic stage, show to fill band guarantor herein
It is fixed to keep steady；3. when filling band is destroyed, strain gauge reading increases to peak value, and pressure cell reading also begins to be increased dramatically,
Show that the destruction of obturation generation herein loses stabilization；If top board continues to sink, destruction partial panels are supported by broken body, strain gauge
Pressure release is failed, and reading decreases；Filling band reduced overall amount continues to increase, and pressure cell reading is rapidly increased to peak at destruction
Value；Part obturation is in the stage after destruction, but filling band integrally keeps stabilization；If 4. top board continues to sink, band is filled
Destroy completely, strain gauge whole pressure release failure reading reduction, the pressure cell reading on the outside of band reduces, positioned at band middle part
Pressure cell reading reach peak value and keep, now pressure cell reading be obturation it is broken after the loose media that is formed to the branch of top board
Support force, fills band overall collapse.
Beneficial effects of the present invention：
The present invention uses invasive measurement means, can truly reflect filling interior strips ess-strain, plastic zone development and
The size of residual stress；Using vibrating string extensometer and vibrating wire cell, easy for installation, insulation explosion-proof performance is good, anti-interference
Ability is strong, long-distance transmissions are undistorted, is suitably monitored for a long time in the adverse circumstances of underground；It is equipped with ground strain signal collection system
System, can be remotely monitor and analyze filling band stability；Monitoring principle accurately and reliably, it is simple and clear, be easy to engineering staff voluntarily
Judge.
Brief description of the drawings
Fig. 1 is filling band strain gauge and pressure cell distribution map（Top view）.
Fig. 2 is the sectional view in Fig. 1 along line A-A.
Fig. 3 is the sectional view in Fig. 1 along line B-B.
The structural representation of Fig. 4 surface acquisition systems.
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 multichannel of 2. pressure cell of embedded strain gauge, 3. support steel wire, 4. template, 5. cable 6. strain is adopted
The compression strength peak value of 9. 10. pressure cell data and curves of obturation compression strength curve of collection 7. computer of instrument, 8. nylon rope 11.
（Breakdown point）12. residual strength 13. signalling channel " INP " socket 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：
A kind of system for monitoring filling band stability, including embedded strain gauge 1 and pressure cell 2；It is pre-buried in filling band
One row's embedded strain gauge 1 and row's pressure cell 2, embedded strain gauge 1 and pressure cell 2 be arranged in parallel, the He of embedded strain gauge 1
Pressure cell 2 is fixed by support steel wire 3 respectively；Ground strain signal real-time acquisition system, embedded strain gauge 1 are equipped with ground
With the end connection cable of pressure cell 2, data are transferred to the strain signal real-time acquisition system on ground by cable long 5；
The built-in temperature sensor of the embedded strain gauge 1, the change that temperature influence is produced to external world 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 ground strain signal real-time acquisition system is made up of multichannel vibratory string signal sampler 6 and computer 7；Vibratory string signal
Acquisition Instrument 6 has multiple signalling channels for receiving strain signal；Data insert vibratory string signal sampler by the wire end plug of cable 5
6 " INP " socket is connected to data collecting system；Computer 7 is used for preserving and analyzing the number of the collection of vibratory string signal sampler 6
According to, multi-channel signal acquiring instrument is controlled using the strain testing analysis system software kit installed on computer 7, and it is right
Monitoring Data is acquired and imports Excel forms, draw strain-pressue-graph with preservation, the data that will be preserved, you can analysis
Judge the stability of filling band.
In the present invention, the pressure cell requires to select corresponding model according to different, is equipped with multichannel vibratory string signal acquisition
The static state and kinetic parameter of instrument measurement structure body.
The size 150mm long of the embedded strain gauge, 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.
A diameter of 20mm of the pressure cell, thickness is 8mm, and range is 10MPa, and precision is 1kPa, can overload 150%, is made
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.
Each has 20 signalling channels to the multichannel vibratory string signal sampler, can simultaneously gather 20 vibrating string type strain letters
Number, when monitoring signals are more than 20, multiple Acquisition Instrument series connection are set.
The cable be four core shielded cables, cable distribution by filler transfer passage, by strain gauge and pressure
The data transfer of box to ground strain signal real-time acquisition system, its transmission range can reach 3000m.
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：By in pressure cell embedment 150mm*150mm*150mm obturation test specimens, water
Maintenance 28 days, demarcates on electro-hydraulic servo forcing press, obtains obturation stress-strain-pressure curve, and curve is divided
Area, obtains stage corresponding strain-pressure characteristic 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, previous-next and the pack support steel wire 3 of L-R two, two pack support steel wires is set up respectively in the middle part of filling space
3 parallel interval 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 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, is slightly relaxed, 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, the colligation of cable 5 is not
Suitable tension, is slightly relaxed, 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, after obturation is poured into a mould 24 hours, the wire end plug of cable 5 is inserted into multi-channel signal acquiring instrument " INP " socket 13, and
Acquisition Instrument is connected with computer 7, the strain testing analysis system software installed on computer 7 is opened, initial data is returned to zero
After start to gather signal, and carry out data preservation in real time；
8th, the data that will be preserved import Excel softwares, and draw strain-pressure curve, by strain-pressure curve and pre-stage test
Stress-strain-pressure curve contrast is obtained, the stage residing for the obturation of each pressure cell correspondence position is analyzed：In the stage
1., i.e., when pressure is less than 0.2MPa, illustrate that obturation is in elastic stage herein, filling band has good stability；In the stage
2., i.e., when pressure is less than 0.9MPa more than 0.2MPa, illustrate that obturation enters the plastic stage herein, filling band is basicly stable；
3., i.e., when pressure is more than 0.9MPa, illustrate that obturation has been destroyed herein when in the stage；According to the pressure cell in the stage 2.
Position, judge the plastic zone scope of obturation；According to the position of the pressure cell in the stage 3., the destruction area of obturation is judged
Scope, when all pressure cells are all in stage 3. position, filling band integrally destroy unstability；Filled after filling band unstability
Still there is the residual strength of 3.1MPa band center.
Claims (10)
- It is 1. a kind of to monitor the system for filling band stability, it is characterised in that：Including embedded strain gauge and pressure cell；In filling Pre-buried row embedded strain gauge and row's pressure cell in band, embedded strain gauge and pressure cell be arranged in parallel；Flush type should Become meter and pressure cell and pass through support fixation with steel wire respectively；Ground strain signal real-time acquisition system is equipped with ground, flush type should Become the end connection cable of meter and pressure cell, the strain signal real-time acquisition system that data pass through cable transmission long to ground；The embedded strain gauge built-in temperature sensor, the change that temperature influence is produced to external world 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 ground strain signal real-time acquisition system is made up of multichannel vibratory string signal sampler and computer；Vibratory string signal is adopted Collection instrument has multiple signalling channels for receiving strain signal；Data insert vibratory string signal sampler by cable wire end plug " INP " socket is connected to data collecting system；Computer is used for preserving and analyzing the data of vibratory string signal sampler collection, uses The strain testing analysis system software kit installed on computer is controlled to multi-channel signal acquiring instrument, and to Monitoring Data It is acquired and imports Excel forms, draw strain-pressue-graph with preservation, the data that will be preserved, you can analysis, judges to fill Fill out the stability of band.
- 2. the system that monitoring according to claim 1 fills band stability, it is characterised in that：The pressure cell is not according to With requiring to select corresponding model, the static state and kinetic parameter of multichannel vibratory string signal sampler measurement structure body are equipped with.
- 3. the system that monitoring according to claim 1 fills band stability, it is characterised in that：The embedded strain gauge Size 150mm long, mid diameter is 22mm；Range is 3000 μ ε, and certainty of measurement is 1 μ ε, use environment temperature：- 20 DEG C~﹢ 80 DEG C, -20 DEG C~+125 DEG C of temperature range, sensitivity of thermometry is 0.25 DEG C.
- 4. the system that monitoring according to claim 1 fills band stability, it is characterised in that：The diameter of the pressure cell It is 20mm, thickness is 8mm, and range is 10MPa, and precision is 1kPa, can overload 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.
- 5. the system that monitoring according to claim 1 fills band stability, it is characterised in that：The multichannel vibratory string letter Each has 20 signalling channels for number Acquisition Instrument, can simultaneously gather 20 vibrating string type strain signals, when monitoring signals are more than 20, Multiple Acquisition Instrument series connection are set.
- 6. the system that monitoring according to claim 1 fills band stability, it is characterised in that：The cable is four core screens Cable is covered, the data transfer of strain gauge and pressure cell to ground is strained and believed by cable distribution by filler transfer passage Number real-time acquisition system, its transmission range can reach 3000m.
- 7. a kind of method for monitoring filling band stability, steady using the monitoring filling band described in any one of claim 1 ~ 6 Qualitatively system, it is characterised in that：（1）Install：Pre-buried row embedded strain gauge and row's pressure cell, its specific method before filling band is poured：Interval 40-60m selectes monitoring point, after filling template is set up and finished, sets up two groups of previous-next and L-R respectively in the middle part of filling space Support steel wire, support fixation with steel wire need to firmly be pulled and strained at directly on filling template skeleton, and two ends colligation is firm；Use nylon Embedded strain gauge is outwards spaced 20-50cm and is uniformly fixed on each two support steel wires of previous-next by rope by center, it is desirable to strained Meter shaft line is in vertical direction；Pressure cell is outwards spaced 20-50cm by center with nylon rope and is uniformly fixed on two branch of L-R On frame steel wire, 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 filling band Middle part, pressure cell fix after in surface smear vaseline；（2）Cable is drawn along support steel wire, is by cable colligation on support steel wire, to be punched in filling template and 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 removed after 3 days；（4）Cable wire end plug is inserted multi-channel signal acquiring instrument " INP " socket of strain signal real-time acquisition system, and will Signal sampler is connected with computer, opens the strain testing analysis system software installed on computer, is opened after being returned to zero to initial data Begin collection signal, and carries out data preservation in real time；（5）The data that will be preserved import Excel softwares, and draw strain-pressure curve, and strain-pressure curve and early stage are tried Stress-strain-pressure curve the contrast of acquisition is tested, the stage residing for the obturation of each pressure cell correspondence position is analyzed：Work as institute When having pressure cell data to be in elastic-plastic phase, filling band has good stability；Rank after partial pressure box data enter to be destroyed Duan Shi, fills band local failure but overall holding stabilization；When the stage after all pressure cell data are in destruction, bar is filled Band overall collapse.
- 8. the method that monitoring according to claim 7 fills band stability, it is characterised in that：The pre-stage test is obtained The method of stress-strain-pressure curve is：Pressure cell is cast in 150mm*150mm*150mm obturation test specimens, normal temperature is wet Maintenance 28 days, pressurizes on electro-hydraulic servo forcing press and demarcates, and obtains obturation stress-strain-pressure curve, and curve is carried out Subregion, obtains stage corresponding strain-pressure characteristic after obturation elastic stage, plastic stage, failure stage, destruction.
- 9. the method that monitoring according to claim 7 fills band stability, it is characterised in that：In the strip filling body Portion's deflection is determined by gob side entry retaining obturation internal strain-ga(u)ge unit reading；According to the reading and location determination of pressure cell, pressure cell is read When number substantially rises, show that obturation enters the plastic stage herein, the obturation in plastic zone keeps stabilization, filling band stabilization Property is good；When pressure cell reading is residual strength, show that obturation loses stabilization into failure stage herein, part obturation is entered When entering the stage after destroying, filling band integrally remains in that stabilization, when destruction area's scope is expanded to entirely fills band, filling Band integrally destroys unstability；The residual strength is pressure cell reading after filling band unstability, shows as pressure cell whole process reading Maximum, residual strength show filling band destruction unstability after still have certain bearing capacity.
- 10. the method that monitoring according to claim 7 fills band stability, it is characterised in that：The pressure cell axis The middle part for being distributed in filling band parallel with axix of strain gauge, spaced 20-30cm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106524959A (en) * | 2016-11-17 | 2017-03-22 | 太原理工大学 | System and method of monitoring stability of filling column body |
| CN107834423A (en) * | 2017-12-08 | 2018-03-23 | 成都星协科技有限公司 | It is easy to fixed cable apparatus for examination and repair |
| CN108571340A (en) * | 2018-04-10 | 2018-09-25 | 天地科技股份有限公司 | Load evaluation method for gob side entry retaining obturation |
| CN110033590A (en) * | 2019-05-22 | 2019-07-19 | 中建八局第三建设有限公司 | For the automatic alarm device and its working method in tall and big formwork system |
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