CN108007333A - A kind of strata displacement monitoring device and monitoring method - Google Patents
A kind of strata displacement monitoring device and monitoring method Download PDFInfo
- Publication number
- CN108007333A CN108007333A CN201711163709.3A CN201711163709A CN108007333A CN 108007333 A CN108007333 A CN 108007333A CN 201711163709 A CN201711163709 A CN 201711163709A CN 108007333 A CN108007333 A CN 108007333A
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- Prior art keywords
- coaxial cable
- strata displacement
- monitoring device
- signal
- monitoring
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Classifications
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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
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
Abstract
The invention discloses a kind of strata displacement monitoring device, it is related to Geotechnical Engineering field.The strata displacement monitoring device includes coaxial cable bragg grid strain transducer, signal (FBG) demodulator, radio receiving transmitting module, solar powered module and retaining wall steel pipe, when coaxial cable bragg grid strain transducer is when rock stratum produces and produces elongation strain displacement is subject to external force to act on, so that the reflection peak frequency for the electromagnetic wave propagated in coaxial cable produces offset, reflected signal is sent to signal (FBG) demodulator and is demodulated, rock stratum is sent to monitoring center by force information by radio receiving transmitting module, the stressing conditions of real-time monitoring objective rock stratum, early warning is carried out to strata displacement.A kind of strata displacement monitoring device disclosed by the invention, firm in structure, wide range of measurement, can work in extreme environment, avoid generation rock stratum is straggly from causing drilling well plug dead and cause the electric gate signal in coaxial cable to interrupt, monitoring effect is more preferable.
Description
Technical field
The present invention relates to Geotechnical Engineering field, and in particular to one kind is based on coaxial cable bragg grid strain sensing
The strata displacement monitoring device of device.
Background technology
At present, since rock stratum compression and land subsidence caused by a large amount of exploitations and the construction of underground engineering of subterranean resource show
As commonplace, huge economic loss is caused to society, prevents and reduces natural disasters and has become compeling for China's economy and society development
It is essential and asks.And rock stratum internal modification, displacement situation are accurately grasped, establishing strata displacement Long-term Monitoring Systems is prevention and administers ground
The key of face sedimentation.
Currently, fiber-optic grating sensor mainly is used for the monitoring device of strata displacement, it mainly by means of SiO2
The low-loss of the signal transmission of single mode optical fiber and clear and definite optical characteristics are monitored work.But fiber-optic grating sensor
The fragility of making material in itself, causes its measurement dynamic range small, fragile, and can not expire under extreme conditions and environment
The requirement of strain measurement when full.
Therefore, in view of problem above, it is necessary to propose a kind of sound construction, wide range of measurement, adaptable rock stratum position
Monitoring device is moved, to meet the needs of research measurement.
The content of the invention
In view of this, the present invention proposes a kind of strata displacement monitoring device, and the monitoring device uses coaxial cable Bradley
Lattice electricity grid strain transducer, firm in structure, monitoring dynamic range is wide, can work in extreme environment and be monitored in real time, can be with
Disaster accident is effectively born, ensures that monitoring device works normally under severe conditions.
A kind of strata displacement monitoring device that purpose according to the present invention proposes, including：
Coaxial cable bragg grid strain transducer：For gather rock stratum by force information and produce electric gate signal；
Signal (FBG) demodulator：It is electrically connected with the coaxial cable bragg grid strain transducer, for receiving electric gate signal
And the electric gate signal is demodulated, to obtain the displacement strain information of the rock stratum；
Radio receiving transmitting module：It is electrically connected with the signal (FBG) demodulator, the position of the rock stratum demodulated for modulating signals into instrument
Move strain information and be transmitted to monitoring center, so that monitoring center carries out early warning according to the displacement strain information of rock stratum.
Preferably, the coaxial cable bragg grid strain transducer is made of an at least coaxial cable, Mei Yisuo
Stating coaxial cable includes inner conductor layer, outer conductor layer and dielectric layer, and the medium is placed in inner conductor layer and outer conductor layer
Between, drilling, the drilling connection inner conductor layer and outer conductor layer are formed inside the coaxial cable, it is described to drill along coaxial electrical
Cable axially carries out periodic distribution, forms electric grid impedance discontinuous structure.
Preferably, the radio receiving transmitting module is low-power consumption Zigbee module, and the Zigbee module includes microcontroller
And radio-frequency module.
Preferably, the monitoring device further includes a solar powered module for being used to provide electric power, and the solar energy supplies
Electric module is electrically connected with signal (FBG) demodulator, and the solar powered module includes solar collecting device and electrical energy storage device.
Preferably, the electrical energy storage device is storage battery.
Preferably, the monitoring device further includes a retaining wall for being used for fixing coaxial cable bragg grid strain transducer
Steel pipe, the retaining wall pipe diameter are 100mm, pipe thickness 3.5mm.
A kind of strata displacement monitoring method, usage right require the strata displacement monitoring device any one of 1-6, institute
Monitoring method is stated to comprise the following steps：
Step 1：According to the geological structure in monitoring region, monitoring point is selected with reference to Rock soil Characteristics；
Step 2：Drill at monitoring point to form drilling well；
Step 3：From the drilling well tripping in retaining wall steel pipe, it is repeated after whole well and rushes well and retaining wall work, removed in well and sink
Product thing；
Step 4：Coaxial cable bragg grid strain transducer is transferred into drilling well；
Step 5：After decentralization, slip casting solidification, fixing coaxial cable are carried out to coaxial cable；
Step 6：The coaxial cable to basset is accessed into signal (FBG) demodulator；
Step 7：Signal (FBG) demodulator receives the electric gate signal in coaxial cable bragg grid strain transducer, and carries out
Demodulation obtains strata displacement information, is then transmitted to monitoring center by radio receiving transmitting module, strata displacement is monitored pre-
It is alert.
Preferably, the Noncoring drill bit that drill bit used in drilling well is diameter 124mm in step 2.
Preferably, retaining wall pipe diameter is 100mm, pipe thickness 3.5mm in step 3.
Preferably, grouting cement cement mortar ratio is cement in step 5:Water:Husky=1:0.65:1.
Compared with prior art, it is the advantages of a kind of strata displacement monitoring device disclosed by the invention：
(1) the coaxial cable bragg grid strain transducer that the present invention uses has good pliability, firm in structure,
It is wide to monitor dynamic range, can work in extreme environment and be monitored in real time, can effectively bear disaster accident, ensures monitoring dress
Put and work normally under severe conditions.
(2) present invention can realize that delamination-terrane monitors, and the change to each rock stratum can monitor.
(3) present invention can work in extreme environment, avoid generation rock stratum is straggly from causing drilling well plug same extremely caused by
Electric gate signal in shaft cable interrupts, and improves monitoring effect.
(4) present invention uses solar power supply apparatus, can realize the self energizing of monitoring device, ensures that monitoring device is out of office
Worked normally under external environment.
Brief description of the drawings
, below will be to embodiment or existing for the clearer explanation embodiment of the present invention or the technical solution of the prior art
Attached drawing does simple introduction needed in technology description, it is clear that, drawings in the following description are only this hair
Some bright embodiments, it will be clear to the skilled person that without creative efforts, may be used also
Other accompanying drawings are obtained according to these attached drawings.
Fig. 1 is a kind of structure diagram of strata displacement monitoring device disclosed by the invention.
Fig. 2 is coaxial cable bragg grid strain transducer structure diagram.
Digital or alphabetical representative parts title in figure is：
1st, solar powered module；2nd, radio receiving transmitting module；3rd, signal (FBG) demodulator；4th, coaxial cable bragg grid strains
Sensor；5th, retaining wall steel pipe；6th, dielectric layer；7th, inner wire；8th, drill；9th, outer conductor.
Embodiment
The embodiment of the present invention is described briefly below in conjunction with the accompanying drawings.Obviously, described embodiment is only
It is the part of the embodiment of the present invention, rather than whole embodiments, based on the embodiments of the present invention, ordinary skill people
Member's all other embodiments obtained on the premise of creative work is not made, belong to the scope of protection of the invention.
Figures 1 and 2 show that a kind of preferred embodiment of strata displacement monitoring device disclosed by the invention, respectively from difference
Angle detailed anatomy has been carried out to structure.
A kind of strata displacement monitoring device as shown in Figs. 1-2, including：
Coaxial cable bragg grid strain transducer 4：For gather rock stratum by force information and produce electric gate signal.
Signal (FBG) demodulator 3：It is electrically connected with coaxial cable bragg grid strain transducer 4, for receiving electric gate signal simultaneously
Electric gate signal is demodulated, to obtain the displacement strain information of rock stratum.
Radio receiving transmitting module 2：It is electrically connected with signal (FBG) demodulator 3, the displacement of the rock stratum demodulated for modulating signals into instrument 3
Strain information is transmitted to monitoring center, so that monitoring center carries out early warning according to the displacement strain information of rock stratum.
4 one end of coaxial cable bragg grid strain transducer is embedded in rock stratum, and the other end is electrically connected with signal (FBG) demodulator 3
Connect, signal (FBG) demodulator 3 is electrically connected the output signal access radio receiving transmitting module 2 of i.e. signal (FBG) demodulator 3 with radio receiving transmitting module 2
Input port.When 4 surrounding rock stratum of coaxial cable bragg grid strain transducer is subjected to displacement change, coaxial cable Prague
For electric grid strain transducer 4 because stress produces elongation strain, electric gate length, which changes, causes reflection of electromagnetic wave peak frequency to occur
Offset, electric gate signal change, and signal (FBG) demodulator 3 receives the electric grid letter in coaxial cable bragg grid strain transducer 4
Number, and be demodulated to obtain strata displacement information, strata displacement information is then transmitted to radio receiving transmitting module 2, by wirelessly receiving
Microcontroller in hair module 2 wakes up radio-frequency module and is transmitted to monitoring center, and early warning is monitored to strata displacement.
Rock stratum stress information is obtained using coaxial cable bragg grid strain transducer 4, firm in structure, monitoring
Dynamic range is wide, can work in extreme environment and be monitored in real time, can effectively bear disaster accident, ensures that monitoring device exists
Worked normally under conditions of severe.
Further, coaxial cable bragg grid strain transducer 4 is made of an at least coaxial cable, each coaxial
Cable includes 7 layers of inner wire, 9 layers of outer conductor and dielectric layer 6, and dielectric layer 6 is placed in 7 layers of inner wire and 9 layers of centre of outer conductor, together
Drilling 8 is formed inside shaft cable, 7 layers of the connection of drilling 8 inner wire axially carries out week with 9 layers of outer conductor, drilling 8 along coaxial cable
Phase property is distributed, and forms electric grid impedance discontinuous structure.Coaxial cable bragg grid sensor 4 is to drill 8 on coax
Make, the coaxial cable section being placed in monitoring rock stratum has drilling 8, that is, the strain of coaxial cable bragg grid passes
Sensor 4, and the coaxial cable in other parts is propagated for electromagnetic wave signal, if drilling 8 makes electric grid and is not limited.
The coaxial cable bragg grid strain transducer 4 is on coax along the cable axial direction progress equidistant cycle
Property drilling, uniform impedance discontinuities are formed on coax, so that bragg grid be made.The spy of coaxial cable transmission line
Sign impedance can be expressed as：
Wherein：μ is magnetic conductivity, and ε is dielectric constant, and a is the inner wire diameter of coaxial cable transmission line, and b is coaxial cable
The outer conductor diameter of transmission line.
The dielectric material at 5 that drills becomes air so as to change the dielectric constant of the dielectric layer of the point so that the point hinders
Anti- change and the characteristic impedance of coaxial cable script do not match that the characteristic impedance of transmission line can be regarded as from Z0It is changed into ZLSo as to
The electromagnetic wave for making to propagate in coaxial cable, which produces, to be reflected, and the voltage reflection coefficient at the impedance discontinuity can be expressed as：
For coaxial cable electricity grid structure, it is assumed that the impedance discontinuity change on coaxial wire has uniformity, then often
Reflected voltage caused by a impedance discontinuity point is same phase, and the reflected voltage signal superposition with phase just generates coaxial cable
Electric gate signal.
Further, radio receiving transmitting module 2 is low-power consumption Zigbee module, wherein Zigbee module include microcontroller and
Radio-frequency module.
Further, which further includes a solar powered module 1 for being used to provide electric power, this is solar powered
Module 1 is electrically connected with signal (FBG) demodulator 3, including solar collecting device and electrical energy storage device, and wherein electrical energy storage device is
Storage battery.Whole monitoring device is powered using solar powered module 1, solar energy is collected by solar cell, and
Convert solar energy into electrical energy to be stored in storage battery and used for whole device, realize the self energizing of monitoring device, ensure monitoring
The all weather operations of device.
Further, which further includes one and is used for fixing coaxial cable bragg grid strain sensing
The retaining wall steel pipe 5 of device 4,5 internal diameter of retaining wall steel pipe are 100mm, pipe thickness 3.5mm.
A kind of strata displacement monitoring device disclosed by the invention, with coaxial cable bragg grid strain transducer 4 into
The stress information gathering of row rock stratum, monitoring result is accurate, and firm in structure, applied widely, is properly applied to extreme environment.
The strata displacement monitoring device of corresponding above-described embodiment, the present invention also propose a kind of strata displacement monitoring method, should
Method is realized using the device of above-described embodiment.The monitoring method comprises the following steps：
Step 1：According to the geological structure in monitoring region, monitoring point is selected with reference to Rock soil Characteristics.
Step 2：Drilling well is carried out at monitoring point, drilling depth is depending on actual conditions.
Step 3：From drilling well tripping in retaining wall steel pipe 5, it is repeated after whole well and rushes well and retaining wall work, removes deposition in well
Thing, and ensure the complete of the borehole wall.
Step 4：Coaxial cable bragg grid strain transducer 4 is transferred into drilling well, is avoided in decentralization process coaxial
Mutually wound between cable.
Step 5：After decentralization, slip casting solidification, fixing coaxial cable are carried out to coaxial cable upper/lower terminal.
Step 6：By 3 input port of the coaxial cable to basset access signal (FBG) demodulator, coaxial cable bassets portion
The length divided is 350mm.
Step 7：Signal (FBG) demodulator 3 receives the electric gate signal in coaxial cable bragg grid strain transducer 4, goes forward side by side
Row demodulation obtains strata displacement information, is then transmitted to monitoring center by radio receiving transmitting module 2, strata displacement is monitored
Early warning.
When 4 surrounding rock stratum of coaxial cable bragg grid strain transducer is subjected to displacement change, coaxial cable Prague
For electric grid strain transducer 4 because stress produces elongation strain, electric gate length, which changes, causes reflection of electromagnetic wave peak frequency to occur
Offset, electric gate signal change, and signal (FBG) demodulator 3 receives the electric grid letter in coaxial cable bragg grid strain transducer 4
Number, and be demodulated to obtain strata displacement information, monitoring center is then transmitted to by radio receiving transmitting module 2, to strata displacement
It is monitored early warning.
Further, the Noncoring drill bit that drill bit used in drilling well is diameter 124mm in step 2.
Further, 5 a diameter of 100mm of retaining wall steel pipe, pipe thickness 3.5mm in step 3.
Further, grouting cement cement mortar ratio is cement in step 5:Water:Husky=1:0.65:1.
In conclusion the coaxial cable bragg grid strain transducer that the present invention uses is firm in structure, wide range of measurement,
It can work in extreme environment and be monitored in real time.The present invention can realize that delamination-terrane monitors, and to the change of each rock stratum
Change can monitor.A kind of strata displacement monitoring device disclosed by the invention can work in extreme environment, avoid that rock stratum mistake occurs
Fall to cause drilling well plug extremely so as to cause the electric gate signal in coaxial cable to interrupt, improve monitoring effect.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize and using the present invention.
A variety of modification modes of these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit and scope of the present invention.Therefore, originally
Invention is not intended to be limited to the embodiments shown herein, and is to fit to the principles and novel features disclosed herein phase
Consistent most wide scope.
Claims (10)
- A kind of 1. strata displacement monitoring device, it is characterised in that including：Coaxial cable bragg grid strain transducer (4)：For gather rock stratum by force information and produce electric gate signal；Signal (FBG) demodulator (3)：It is electrically connected with the coaxial cable bragg grid strain transducer (4), for receiving electric grid letter Number and the electric gate signal is demodulated, to obtain the displacement strain information of the rock stratum；Radio receiving transmitting module (2)：It is electrically connected with the signal (FBG) demodulator (3), the rock stratum demodulated for modulating signals into instrument (3) Displacement strain information be transmitted to monitoring center, so as to monitoring center according to the displacement strain information of rock stratum carry out early warning.
- 2. strata displacement monitoring device according to claim 1, it is characterised in that the coaxial cable bragg grid should Become sensor (4) to be made of an at least coaxial cable, each coaxial cable includes inner wire (7) layer, outer conductor (9) layer And dielectric layer (6), the dielectric layer (6) is placed among inner wire (7) layer and outer conductor (9) layer, inside the coaxial cable Form drilling (8), described drilling (8) connection inner wire (7) layer and outer conductor (9) layer, the drilling (8) is along coaxial cable axis To periodic distribution is carried out, electric grid impedance discontinuous structure is formed.
- 3. strata displacement monitoring device according to claim 2, it is characterised in that the radio receiving transmitting module (2) is low Power consumption Zigbee module, the Zigbee module include microcontroller and radio-frequency module.
- 4. strata displacement monitoring device according to claim 1, it is characterised in that the monitoring device further includes one and is used for The solar powered module (1) of electric power is provided, the solar powered module (1) is electrically connected with signal (FBG) demodulator (3), it is described too Positive energy power supply module (1) includes solar collecting device and electrical energy storage device.
- 5. strata displacement monitoring device according to claim 4, it is characterised in that the electrical energy storage device is electric power storage Pond.
- 6. strata displacement monitoring device according to claim 1, it is characterised in that the monitoring device further includes one and is used for The retaining wall steel pipe (5) of fixing coaxial cable bragg grid strain transducer (4), retaining wall steel pipe (5) internal diameter is 100mm, Pipe thickness is 3.5mm.
- 7. a kind of strata displacement monitoring method, it is characterised in that usage right requires the strata displacement prison any one of 1-6 Device is surveyed, the monitoring method comprises the following steps：Step 1：According to the geological structure in monitoring region, monitoring point is selected with reference to Rock soil Characteristics；Step 2：Drill at monitoring point to form drilling well；Step 3：From the drilling well tripping in retaining wall steel pipe (5), it is repeated after whole well and rushes well and retaining wall work, removed in well and sink Product thing；Step 4：By coaxial cable bragg grid strain transducer (4) decentralization into drilling well；Step 5：After decentralization, slip casting solidification, fixing coaxial cable are carried out to coaxial cable；Step 6：By the coaxial cable to basset access signal (FBG) demodulator (3)；Step 7：Signal (FBG) demodulator (3) receives the electric gate signal in coaxial cable bragg grid strain transducer (4), goes forward side by side Row demodulation obtains strata displacement information, is then transmitted to monitoring center by radio receiving transmitting module (2), strata displacement is supervised Survey early warning.
- 8. strata displacement monitoring method according to claim 7, it is characterised in that drill bit used in drilling well is straight in step 2 The Noncoring drill bit of footpath 124mm.
- 9. strata displacement monitoring method according to claim 8, it is characterised in that retaining wall steel pipe (5) internal diameter in step 3 For 100mm, pipe thickness 3.5mm.
- 10. strata displacement monitoring method according to claim 9, it is characterised in that grouting cement mortar is matched somebody with somebody in step 5 Than for cement:Water:Husky=1:0.65:1.
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| CN201711163709.3A CN108007333A (en) | 2017-11-21 | 2017-11-21 | A kind of strata displacement monitoring device and monitoring method |
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| CN201711163709.3A CN108007333A (en) | 2017-11-21 | 2017-11-21 | A kind of strata displacement monitoring device and monitoring method |
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| CN201711163709.3A Pending CN108007333A (en) | 2017-11-21 | 2017-11-21 | A kind of strata displacement monitoring device and monitoring method |
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| CN109655001A (en) * | 2019-02-03 | 2019-04-19 | 南京吉欧地下空间科技有限公司 | A kind of device and its application method of the lateral displacement of the in-situ monitoring soil body |
| CN111059996A (en) * | 2019-07-12 | 2020-04-24 | 天津城建大学 | Comprehensive pipe rack health monitoring system based on ZigBee technology |
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Application publication date: 20180508 |