CN206772242U - A kind of tunnel wall rock deformation distributed optical fiber sensing device based on pipe shed support - Google Patents
A kind of tunnel wall rock deformation distributed optical fiber sensing device based on pipe shed support Download PDFInfo
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- CN206772242U CN206772242U CN201720528355.7U CN201720528355U CN206772242U CN 206772242 U CN206772242 U CN 206772242U CN 201720528355 U CN201720528355 U CN 201720528355U CN 206772242 U CN206772242 U CN 206772242U
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Abstract
The utility model discloses a kind of tunnel wall rock deformation distributed optical fiber sensing device based on pipe shed support, fine test tube single segmental is made up of optical fiber, extension crossover sub and hollow circular-tube, optical fiber test tube single segmental lateral wall is provided with ortho-symmetric groove, optical fiber is pasted in groove surfaces, and end, which is provided with, extends crossover sub；Pipe boron steel pipe is hollow and side wall is provided with slurry outlet, guide pipe oblique cutting is on steel arch-shelf, steel arch-shelf is housed on wall is oriented to, pipe boron steel pipe is located in guide pipe, and optical fiber test tube single segmental single segmental is located in pipe boron steel pipe, and drill bit of drilling machine passes through guide pipe, borer drill rod is located in pipe boron steel pipe, optical fiber introduction pipe is provided with optical fiber test tube single segmental one end, injected hole is provided with optical fiber introduction pipe, the sensor fibre of the optical fiber test tube single segmental of monitoring holes is connected by extending crossover sub.It is simple in construction, it is easy to use, optical fiber test tube single segmental is placed in pipe boron steel pipe, greatly increases the security of constructing tunnel.
Description
Technical field
The utility model belongs to tunnel advanced support monitoring technical field, is more particularly to a kind of tunnel based on pipe shed support
The monitoring device of road surrouding rock deformation distribution type fiber-optic.
Background technology
During tunnel excavation, it is frequently encountered crushed zone, loose band, soft stratum, water burst, gushes the locations such as sand,
Excavated under this kind of geological conditions, if without leading pre-supporting, it is easy to there is the situation of caving in, cause security incident,
Economic loss not only is caused to relevant enterprise, increases engineering cost, and greatly influence engineering construction progress and construction quality.
Before the excavation that existing line or building and river, lake are worn under constructing tunnel, if without leading pre-supporting, it is easy to
Cause on tunnel the sedimentation of existing line or building and river, lake water burst and bring various potential safety hazards.
Barrel vault advanced support is the drilling that will be drilled on the outside of excavation contour line of the one group of steel pipe (i.e. pipe canopy pipe) along tunnel
Squeeze into stratum, and combine to form powerful frame pre support reinforcement system with steel arch-shelf, enclosed to support from Guan Peng tops
The load of rock, and being pressurizeed the slip casting into stratum by injected hole, to reinforce the stratum of weak broken, improve stratum from steady energy
Power.Pipe shed support also generates corresponding deformation while stable excavation country rock, comprehensive by testing the deformation
The monitoring result of ground settlement, vault sinking and clearance convergence, complete pipe shed support Assessment of Surrounding Rock Stability system can be formed,
The deformation of real-time monitoring tubular canopy supporting country rock, greatly increase the security of constructing tunnel.
At present, in tunnel advanced support monitoring technical field, the particularly technology relevant with the monitoring of tunnel construction phase
Method mainly has soil body settlement monitoring technology in ground, soil body battering methods, earth's surface, Vault settlement monitoring technology etc., instrument and equipment
More using sedimentometer, inclinometer, total powerstation, spirit level etc..These technical methods have point measurement feature, and measuring point is sparse, difficult
To realize the conduct monitoring at all levels to measurand.Conventional monitoring technology majority can not still realize real-time monitoring, and sensing principle
Varied, data class is more, it is difficult to integrates extensive real-time monitoring system.Therefore, it is necessary to research and develop suitable for tunnel
The advanced method of real-time of surrouding rock deformation and technology in barrel vault advanced support hole, to meet that growing safety for tunnel engineering is supervised
The requirement of survey and the needs of theoretical research.
Prepulsing pumping Brillouin optical time domain analysis PPP-BOTDA (Pulse-PrePump based on Brillouin scattering principle
Birlouin Optical Time-Domain Analysis) be great development prospect strain and temperature monitoring technique.
It is except having the characteristics that the corrosion-resistant, anti-interference of general optical fiber sensing technology, the upgrading of the technology or traditional BOTDA systems
Product, realize high-resolution (<10cm) with high accuracy (<± 8) measure, have in spatial resolution and precision aspect obvious excellent
Gesture.The technology loads the pre- pump light of appropriate pulse, excites phonon in advance, then utilize pulsed light before pulsed light is imported
Stimulated Brillouin scattering effect in a fiber and optical time domain reflection technology realize that the long range of temperature and strain is full distributed
Measurement, arbitrfary point strain and temperature information along optical fiber can be obtained.PPP-BOTDA distribution type fiber-optics are applied to large structure
Health status detection and monitoring, at present also without more perfect distribution type fiber-optic in terms of tunnel surrounding advance support monitoring
Monitoring technology.It is particularly suitable for use in particular difficulty location, as in rock mass smashed to pieces, fault disruption zone rock mass, landslide body, talus cone
The tunnel of the country rocks such as section, sand texture stratum, strong dilatancy stratum, strong rheological stratum, cranny development rock mass, the big bias of shallow embedding surpasses
Preceding Support Deformation monitoring.
The content of the invention
The purpose of this utility model is to be the provision of a kind of tunnel wall rock deformation distribution type fiber-optic based on pipe shed support
Monitoring device, it is simple in construction, it is easy to use, it is ingenious using pipe shed support drill, prefabricated optical fiber test tube single segmental is put
Put in pipe boron steel pipe, complete pipe shed support Assessment of Surrounding Rock Stability system can be formed, real-time monitoring tubular canopy supporting country rock
Deformation, greatly increase the security of constructing tunnel.
In order to realize above-mentioned purpose, the utility model uses following technical measures：
Its technical concept is：Stratum is squeezed into the monitoring drilling being drilled on the outside of excavation contour line of the pipe boron steel pipe along tunnel
It is interior, screwed connection is used between steel pipe；After penstock installation, along tunnel Longitudinal extending direction from the front to the back to prefabricated point
Section optical fiber test tube single segmental carries out splicing assembling, due to narrow, the upper section optical fiber test tube single-unit of operating space in Tunnel
Section is sent into steel pipe, and then splicing assembles next section optical fiber test tube single segmental, the optical fiber of multiple sections at steel pipe opening
Test tube single segmental built up and assembling method all same.
A kind of monitoring method of the tunnel wall rock deformation distribution type fiber-optic based on pipe shed support, its step are：
Step 1: using pipe shed drilling rig, from guide pipe internal drilling, the method for sleeve pipe follow-up, along tunnel excavation contour line
Outer setting position drills through monitoring holes, horizontal laying steel pipe；For pipe boron steel pipe by mechanical jacking, steel pipe joint is intersegmental to use screwed connection；
Step 2: pipe boron steel tube top in place after, by first segment optical fiber the first groove of test tube single segmental starting end and second
Groove optical fiber conversion extending connector series connection overlap joint, the 3rd groove and the 4th groove optical fiber conversion extending connector series connection overlap joint, optical fiber
Joint carries out sealing protection with plastic sheeting, and by the slow jacking of machinery, optical fiber test tube single segmental starting end is sent into pipe boron steel
In pipe, and 0.18-0.22m optical fiber test tube single-unit segment length is reserved at steel pipe opening, pay attention to ensureing optical fiber test tube single segmental first
Groove is straight up；
Step 3: the optical fiber test tube single segmental of second section is used into inner connecting tube cementation method at steel pipe opening, with first
Section optical fiber test tube single segmental terminal splice, ensures the groove alignment of two optical fiber test tube single segmentals during splicing, and optical fiber is using prolonging
Long crossover sub connects to form vertical and horizontal fiber loop, carries out sealing protection with plastic sheeting at fibre-optical splice, has spliced
After by the slow jacking of machinery, second section optical fiber test tube single segmental is sent into pipe boron steel pipe, and is reserved at steel pipe opening
0.18-0.22m optical fiber test tube single-unit segment length, pay attention to ensureing the first groove of optical fiber test tube single segmental straight up；
Step 4: the optical fiber test tube single segmental joining method of other sections and second section optical fiber and the 3rd described in step 3
Section optical fiber test tube single segmental joining method is identical, final available and pipe boron steel length of tube identical optical fiber test tube single segmental；
Step 5: installation drilling and sealing device, is surveyed using the cement mortar that slip casting machine injection has configured to slurries full of optical fiber
Pipe single segmental and pipe canopy country rock space, and drawn optical fiber by the optical fiber fairlead on drilling and sealing device cover plate with protection sleeve pipe
Pipe boron steel pipe.
Step 6: by the sensor fibre of the different monitoring opening position optical fiber test tube single segmentals of tunneltron canopy supporting construction by prolonging
The series connection of long crossover sub, by the Strain Distribution of PPP-BOTDA prepulsing pumping Brillouin optical time domain analysis instrument synchro measure optical fiber,
Form distributed optical fiber sensing net, by strain make the difference, integral operation calculate optical fiber test tube single segmental two-dimension displacement be distributed, surpass
The deformation of the preceding tunnel pipe shed support country rock of monitoring in real time.
By above-mentioned monitoring method, the deficiency of tunnel advanced support routine monitoring ways and means is improved, realizes tunnel
Pipe shed support country rock distributed monitoring and advanced monitoring, overcome the discontinuous shortcoming of traditional monitoring means measuring point, and high density is surveyed
Point spacing can reach 5cm, and with economy, convenient, anti-interference, the features such as excellent durability.
A kind of monitoring device of the tunnel wall rock deformation distribution type fiber-optic based on pipe shed support, it is by optical fiber test tube single-unit
Section, optical fiber, hollow circular-tube, inner connecting tube, the first groove, the second groove, the 3rd groove, the 4th groove, extension crossover sub, guiding
Pipe, monitoring holes, pipe boron steel pipe, slurry outlet, guiding wall, steel arch-shelf, injected hole, optical fiber introduction pipe, rig composition, it, which is connected, closes
System is：Optical fiber test tube single segmental is made up of optical fiber, extension crossover sub and hollow circular-tube, and optical fiber test tube single segmental lateral wall is provided with
Ortho-symmetric first groove, the second groove, the 3rd groove and the 4th groove, optical fiber are pasted in groove surfaces, and end, which is provided with, prolongs
Long crossover sub is convenient to be spliced；Pipe boron steel pipe is hollow and side wall is provided with multiple (60-120) (slurry outlet aperture 12mm, pitch of holes
15cm, in quincuncial arrangement) slurry outlet；Guide pipe and guiding wall play channeling direction to rig, and guide pipe oblique cutting is in steel arch
On frame；Steel arch-shelf is housed on wall is oriented to, pipe boron steel pipe is located in guide pipe, as borer drilling procedure is constantly to face
Direction promotes, and optical fiber test tube single segmental single segmental is located in pipe boron steel pipe, and drill bit of drilling machine passes through guide pipe, and borer drill rod is positioned at pipe
In boron steel pipe, optical fiber introduction pipe is provided with optical fiber test tube single segmental one end, injected hole is provided with optical fiber introduction pipe, passes through
Injected hole slip casting makes optical fiber test tube single segmental and pipe boron steel the pipe compatible deformation under shoulder bed effects, and optical fiber is drawn by optical fiber introduction pipe
Go out convenient monitoring；The sensor fibre of the optical fiber test tube single segmental of different monitoring holes is connected by extending crossover sub, by PPP-
The Strain Distribution of BOTDA prepulsing pumping Brillouin optical time domain analysis instrument synchro measure optical fiber.
Described optical fiber test tube single segmental includes tight skin optical fiber, conversion extending connector and hollow circular-tube, tight skin optical fiber and passed through
Epoxide-resin glue is pasted in hollow circular-tube unit with grooves in outer wall face, and is connected in series in pipe end and conversion extending connector；Used
The outer wall of hollow circular-tube offer the first groove, the second groove, the 3rd groove and the 4th groove；Described the first groove,
Angle between two grooves, the 3rd groove and the 4th groove is 180 degree, 90 degree (inverse time directions) and 90 degree of (up times respectively
Direction)；It is pre- that the first groove, the second groove, the 3rd groove and the 4th groove of the optical fiber test tube single segmental paste laying respectively
The tight skin optical fiber of measured length, optical fiber end are equipped with conversion extending connector.
Preferably, hollow circular-tube is PP-R pipes used by the utility model, there is good pliability, hollow circular-tube
Caliber can be determined according to the pipe diameter size of pipe shed support, and be less than pipe diameter.
Preferably, the single length of hollow circular-tube is typically in 2 or 4m, described open circles used by the utility model
The external diameter of pipe is not less than 40mm, and hollow circular-tube wall thickness is not less than 5mm, the first groove opened up on described hollow circular-tube outer wall,
The cross sectional dimensions of second groove, the 3rd groove and the 4th groove is 3mm × 3mm, and two hollow circular-tube ends can be by interior
Take over it is cementing, it is noted that groove aligns during docking.
Preferably, distribution type fiber-optic is hard-pressed bale sheath straining and sensing optical fiber used by the utility model, the length of optical fiber
Degree is slightly larger than hollow circular-tube joint length, and typically in 2.2 or 4.2m, hollow circular-tube both ends respectively have more 0.1m and reserve fiber lengths,
And optical fiber both ends are equipped with conversion extending connector；The groove of hollow circular-tube first, the second groove, the 3rd groove and the 4th groove are corresponding
Optical fiber using conversion extending connector series connection, be packaged with polyurethane elastomeric materials protection on the outside of the fibre core of the distribution type fiber-optic
Layer, the diameter of the distribution type fiber-optic is 2mm, and weight is 2kg/km.
By said apparatus, overcome traditional monitoring device and lay heavy scarce of inconvenience, operating difficulties, operator monitoring amount
Point, simple optical fiber not only as sensing element but also be signal transmission passage, it is not necessary to extra lead, data acquisition are transmitted and constructed
Favorably, diverse location monitoring holes optical fiber can connect so that extensive data acquisition when laying and draw it is all relatively simple easy, can
More for monitoring project, extensive monitoring cost is low, improves monitoring efficiency；
A kind of preparation (prefabricated) method of optical fiber test tube single segmental, its step are：
A, the length and quantity of hollow circular-tube are determined according to the length of tunneltron canopy supporting steel pipe, hollow circular-tube is carried out recessed
Groove processing, i.e., the first groove opened up on hollow circular-tube outer wall, the second groove, the cross sectional dimensions of the 3rd groove and the 4th groove
Be 3mm × 3mm, the angle between the first groove, the second groove, the 3rd groove and the 4th groove be respectively 180 degree, 90 degree
(inverse time direction) and 90 degree (up time directions)；
B, after the completion of slotting, groove sticking veneer is cleaned with absolute ethyl alcohol, is air-dried, it is ensured that bonding surface is clean, viscous to ensure
Paste quality；
C, strict modulating epoxy resin in proportion, first uniformly smears 0.4- along the groove of hollow circular-tube one end first
0.6mm thickness bottom epoxy resin, and it is straight along tight skin optical fiber of the first groove laying both ends with conversion extending connector in time
To hollow circular-tube notch end, the optical fiber of each reserved 0.1m length in both ends is paid attention to, this process will ensure that optical fiber suitably tightens holding
It is straight, must not occur artificially causing optical fiber initial bending defect；Bottom epoxy resin reaches initial setting strength after 30-40 minutes, weight
New modulating epoxy resin, painting scrape coating epoxy resin until reaching design coating layer thickness, make epoxy resin aspect and open circles
Pipe outer wall face keeps basically identical；
D, the concrete operations weight identical with the first groove of pasting method of the second groove, the 3rd groove and the 4th groove optical fiber
Multiple step C is once；
According to the classical mechanics of materials, in all methods for calculating malformation, strain quadratic integral method can directly establish knot
Structure strains the relation between deformation, is calculated as follows
In formula：W (x) is vertical deformation at axis of no-feathering line coordinates x, downwards for just；ε (x) be structure bottom from neutral axis away from
From the strain at y, tension is just；A and B is respectively the corner and deformation at x=0, and corner is with counterclockwise for just.
Excavation contour line of the pipe boron steel pipe along tunnel is toward face direction according to certain length 10-45m arrangements, steel pipe axis
There is certain angle α=1-13 °, the tunnel excavation process middle pipe canopy inner fiber test tube single segmental single segmental port of export with tunnel axis
Sedimentation and deformation first occurs, the face forward direction other end is relatively fixed (both without corner or non-displacement), can be reduced to cantilever beam
Model, using pipe canopy steel pipe axis as reference axis x-axis, bring Flexural cantilever model border x=0, w (0)=0 into；X=0, θ (0)=0 are arrived
Formula (1), obtains A=0, B=0, then at optical fiber test tube single segmental single segmental optional position x (Fig. 1) relative to basic point 0 displacement
For：
Project to using tunnel axis direction as under the coordinate system of transverse axis, the horizontal displacement of optical fiber test tube single segmental single segmental divides
Cloth is formula (2), because steel pipe axis and tunnel axis have certain angle α, the vertical position of optical fiber test tube single segmental single segmental
Shifting is distributed as：
In formula：Δ ε (x) is that the groove of hollow circular-tube first and the second groove or the 3rd groove and the 4th groove are symmetrically laid
The difference of fibre strain changing value (relative to the changing value of initial strain), D are hollow circular-tube overall diameter, and α is steel pipe axis and tunnel
Road axis angle, cos α are steel pipe axis and tunnel axis included angle cosine value, W1(x) it is the perpendicular of optical fiber test tube single segmental single segmental
To Displacements Distribution；Strain according to formula (3) by two optical fiber above and below the groove of hollow circular-tube first and the second groove, is done
Difference, integral operation can calculate the vertical Displacements Distribution of optical fiber test tube single segmental single segmental；Similarly, according to formula (2) by sky
The strain of two articles of optical fiber of the groove of heart pipe the 3rd and the 4th groove or so, made the difference, integral operation can also calculate optical fiber
The Displacements Distribution of test tube single segmental single segmental horizontal direction.
When tunneltron canopy supporting construction deforms, synchronous deformation, hollow circular-tube cloth will occur with pipe canopy for hollow circular-tube
If four sensor fibres can produce corresponding strain with the deformation of pipe, above and below the groove of hollow circular-tube first and the second groove
The strain of two optical fiber, is made the difference, integral operation can calculate the vertical Displacements Distribution of optical fiber test tube single segmental single segmental, together
Reason, the strain of the groove of hollow circular-tube the 3rd and the 4th groove or so two articles of optical fiber is made the difference, integral operation can calculate light
Fine test tube single segmental single segmental horizontal direction Displacements Distribution.Do difference operation refer to the groove of hollow circular-tube first and the second groove or
The strain value of the groove of person the 3rd and the symmetrical optical fiber of the 4th groove subtracts each other, respectively obtain sensor vertically to and horizontal direction
Two-dimentional difference Strain Distribution；Hollow circular-tube is obtained by carrying out quadratic integral computing along hollow circular-tube length to difference Strain Distribution
Arbitrfary point relative to 0 point of basic point displacement；By the different monitoring opening position optical fiber test tube single segmental single-units of tunneltron canopy supporting construction
The sensor fibre of section is connected by extending crossover sub, synchronous by PPP-BOTDA prepulsing pumping Brillouin optical time domain analysis instrument
The Strain Distribution of optical fiber is measured, forms distributed optical fiber sensing net, the deformation feelings of the advanced tunnel pipe shed support country rock of monitoring in real time
Condition.
The utility model compared with existing monitoring technology, it is maximum the characteristics of there is provided a kind of tunnel based on pipe shed support
Surrouding rock deformation distributed optical fiber sensing method and device, advantage are as follows：
1) by the way that prefabricated optical fiber test tube single segmental single segmental is put into tunneltron boron steel pipe, tunnel excavation mistake is monitored
The dynamic of pipe shed support country rock in journey, realize advanced, monitoring in real time；
2) distributed monitoring can be realized, high density measuring point spacing can reach 5cm, overcome traditional monitoring hand in Tunnel
The section discontinuous shortcoming of measuring point,
3) simple optical fiber not only as sensing element but also is signal transmission passage, it is not necessary to extra lead, data acquisition is passed
Defeated and construction is favourable, has economy, and convenient, anti-interference, excellent durability, data stabilization reliably waits many advantages；
4) sensor can connect so that extensive data acquisition when laying and draw it is all relatively simple easy, available for monitoring
Project is more, and extensive monitoring cost is low, improves monitoring efficiency；
5) monitoring result of comprehensive ground settlement, vault sinking and clearance convergence, can form complete pipe shed support country rock
Estimation of stability system, the security of the deformation of real-time monitoring tubular canopy supporting country rock, greatly increase constructing tunnel；
Brief description of the drawings
Fig. 1 is a kind of monitoring principle model simplification schematic diagram based on pipe shed support.
Fig. 2 is a kind of optical fiber test tube single segmental structural representation.
Fig. 3 is a kind of optical fiber test tube single segmental cross-sectional view.
Fig. 4 is a kind of tunnel pipe shed support drilling layout position illustration.
Fig. 5 is a kind of pipe boron steel tubular construction schematic diagram.
Fig. 6 is a kind of pipe canopy multiple tube cross-sectional view.
Fig. 7 is a kind of tunnel wall rock deformation distributed optical fiber sensing apparatus structure schematic diagram based on pipe shed support.
In figure, 1- optical fiber test tubes single segmental, 1-1- optical fiber, 1-2- hollow circular-tubes, 1-3- inner connecting tubes, 1-4- first
Groove, the grooves of 1-5- second, the grooves of 1-6- the 3rd, the grooves of 1-7- the 4th, 1-8- extend crossover sub, 2- guide pipes,
3- monitoring holes, 4- pipe boron steels pipe, 5- slurry outlets, 6- are oriented to wall, 7- steel arch-shelfs, 8- injected holes, 9- optical fiber fairleads
Road, 10- rigs (ZSDL-160 multifunctional all-hydraulics caterpillar drilling machine).
Embodiment
Embodiment 1：
It can be seen from Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, a kind of tunnel wall rock deformation based on pipe shed support point
Cloth fiber-optic monitoring method, specifically includes following steps：
Step 1: using pipe shed drilling rig 10, the method to be followed up from the internal drilling of guide pipe 2, steel pipe 4, along tunnel excavation wheel
Setting position outside profile drills through monitoring holes 3, horizontal laying steel pipe 4；Pipe boron steel pipe 4 uses silk by mechanical jacking, steel pipe 4 between section
Button connection；
Step 2: after pipe boron steel pipe 4 pushes up in place, by starting end the first groove 1-4 of first segment optical fiber test tube single segmental 1 and
Second groove 1-5 optical fiber conversion extending connector 1-8 series connection overlap joints, the 3rd groove 1-6 and the conversion extension of the 4th groove 1-7 optical fiber connect
Head 1-8 series connection is overlapped, and sealing protection is carried out with plastic sheeting at fibre-optical splice, by the slow jacking of machinery, by optical fiber test tube single-unit
1 starting end of section is sent into pipe boron steel pipe 4, and in the reserved length of 0.2m optical fiber test tubes single segmental 1 in 4 mouthfuls of places of steel pipe, pays attention to guarantee light
The fine groove 1-4 of test tube single segmental 1 first is straight up；
Step 3: the optical fiber test tube single segmental 1 of second section is used into inner connecting tube 1-3 cementation methods at 4 mouthfuls of steel pipe, with
The terminal splice of first segment optical fiber test tube single segmental single segmental 1, the groove pair of two optical fiber test tube single segmentals 1 is ensured during splicing
Together, optical fiber 1-1 is connected to form vertical and horizontal fiber loop using extension crossover sub 1-8, and plastic sheeting is used at fibre-optical splice
Sealing protection is carried out, by the slow jacking of machinery after the completion of splicing, second section optical fiber test tube single segmental single segmental 1 is sent into pipe canopy
In steel pipe 4, and the length of 0.2m optical fiber test tubes single segmental 1 is reserved at 4 mouthfuls of steel pipe, pays attention to guarantee optical fiber test tube single segmental 1 first
Groove 1-4 is straight up；
Step 4: the joining method of optical fiber test tube single segmental 1 of other sections and second section optical fiber test tube described in step 3
Single segmental 1 is identical with the 3rd section optical fiber test tube 1 joining method of single segmental, the final available and length identical of pipe boron steel pipe 4
Optical fiber test tube single segmental single segmental 1；
Step 5: installation drilling and sealing device, injects the cement mortar configured by injected hole 8 and is surveyed to slurries full of optical fiber
Pipe single segmental 1 and pipe canopy country rock space, and the fairlead canopy of optical fiber introduction pipe 9 by optical fiber 1-1 by drilling and sealing device side
Steel pipe 4；
Step 6: the sensor fibre 1-1 of optical fiber test tube single segmental 1 at tunneltron canopy supporting construction difference monitoring holes 3 is led to
Extension crossover sub 1-8 series connection is crossed, by PPP-BOTDA prepulsing pumping Brillouin optical time domain analysis instrument synchro measure optical fiber 1-1
Strain Distribution, form distributed optical fiber sensing net, by strain make the difference, integral operation calculates optical fiber test tube single segmental 1 two
Tie up Displacements Distribution, the deformation of the advanced tunnel pipe shed support country rock of monitoring in real time.
It is described make the difference, integral operation is referred to when tunneltron canopy supporting construction deforms, the first groove of hollow circular-tube 1-
4 and second the symmetrical optical fiber 1-1 of groove 1-5 or the 3rd groove 1-6 and the 4th groove 1-7 strain value subtract each other, respectively
Obtain optical fiber test tube single segmental single segmental 1 vertically to horizontal direction two dimension difference Strain Distribution；By to difference Strain Distribution
Quadratic integral computing, which is carried out, along hollow circular-tube 1-2 length obtains displacement of the hollow circular-tube 1-2 arbitrfary points relative to 0 point of basic point, will
The sensor fibre 1-1 of the opening position optical fiber test tube single segmental 1 of tunneltron canopy supporting construction difference monitoring holes 3 is by extending crossover sub
1-8 connects, and by PPP-BOTDA prepulsing pumping Brillouin optical time domain analysis instrument synchro measure optical fiber 1-1 Strain Distribution, forms
Distributed optical fiber sensing net, the deformation of the advanced tunnel pipe shed support country rock of monitoring in real time.
The integral operation calculation formula is：Under the coordinate system using tunnel axis direction as transverse axis, optical fiber test tube single-unit
The horizontal displacement of section single segmental is distributed asThe vertical displacement of optical fiber test tube single segmental single segmental is distributed asΔ ε (x) is that the groove of hollow circular-tube first and the second groove or the 3rd groove and the 4th are recessed in formula
Groove symmetrically lay fibre strain changing value (relative to the changing value of initial strain) difference, D is hollow circular-tube overall diameter, and α is
Steel pipe axis and tunnel axis angle.
Embodiment 2：
It can be seen from Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, a kind of tunnel wall rock deformation based on pipe shed support is distributed
The monitoring device of optical fiber, it by optical fiber test tube single segmental 1, optical fiber 1-1, hollow circular-tube 1-2, inner connecting tube 1-3, the first groove 1-4,
Second groove 1-5, the 3rd groove 1-6, the 4th groove 1-7, extension crossover sub 1-8, guide pipe 2, monitoring holes 3, pipe boron steel pipe
4th, slurry outlet 5, guiding wall 6, steel arch-shelf 7, injected hole 8, optical fiber introduction pipe 9, rig 10 form, and its annexation is：Optical fiber
Test tube single segmental 1 is made up of optical fiber 1-1, extension crossover sub 1-8 and hollow circular-tube 1-2, and the lateral wall of optical fiber test tube single segmental 1 is opened
There are ortho-symmetric first groove 1-4, the second groove 1-5, the 3rd groove 1-6 and the 4th groove 1-7, optical fiber 1-1 to paste recessed
Rooved face, end, which is provided with, extends the convenient splicings of crossover sub 1-8；Pipe boron steel pipe 4 is hollow and side wall is provided with multiple slurry outlets 5；Lead
Play channeling direction to rig 10 to pipe 2 and guiding wall 6, the oblique cutting of guide pipe 2 is equipped with being oriented on wall 6 on wall 6 is oriented to
Steel arch-shelf 7, pipe boron steel pipe 4 are located inside guide pipe 2, and the drill bit of rig 10 passes through guide pipe 2, and the drilling rod of rig 10 is located at pipe boron steel pipe
Inside 4, completed as the drilling process of rig 10 constantly promotes to face direction, optical fiber test tube single segmental single segmental 1 is positioned at pipe
Inside boron steel pipe 4, optical fiber introduction pipe 9 is provided with the one end of optical fiber test tube single segmental 1, slip casting is provided with optical fiber introduction pipe 9
Hole 8, optical fiber test tube single segmental 1 and pipe boron steel pipe 4 compatible deformation under shoulder bed effects are made by the slip casting of injected hole 8, optical fiber 1-1 by
Optical fiber introduction pipe 9 draws convenient monitoring；The sensor fibre 1-1 of the optical fiber test tube single segmental 1 of different monitoring holes 3 is turned by extending
Changing-over head 1-8 is connected, and variation is answered by PPP-BOTDA prepulsing pumping Brillouin optical time domain analysis instrument synchro measure optical fiber 1-1
Cloth.
The optical fiber test tube single segmental 1 includes tight skin optical fiber 1-1, conversion extending connector 1-8 and hollow circular-tube 1-2, tight skin
Optical fiber 1-1 is pasted in hollow circular-tube 1-2 unit with grooves in outer wall face by epoxide-resin glue, and in pipe end and conversion extending connector 1-
8 are connected in series；Used hollow circular-tube 1-2 outer wall offers the first groove 1-4, the second groove 1-5, the 3rd groove 1-6
With the 4th groove 1-7；Folder between the first groove 1-4, the second groove 1-5, the 3rd groove 1-6 and the 4th groove 1-7
Angle is 180 degree, 90 degree (inverse time directions) and 90 degree (up time directions) respectively；First groove of the optical fiber test tube single segmental 1
1-4, the second groove 1-5, the 3rd groove 1-6 and the 4th groove 1-7 paste the tight skin optical fiber 1-1 for laying predetermined length, light respectively
Fine 1-1 ends are equipped with conversion extending connector 1-8.
Preferably, hollow circular-tube 1-2 is PP-R pipes used by the utility model, there is good pliability, it is hollow
Pipe 1-2 pipe diameter size 50mm or 80mm can determine according to the internal diameter size 76mm or 108mm of steel pipe 4 of pipe shed support,
And it is less than the internal diameter of steel pipe 4.
Preferably, length single hollow circular-tube 1-2 used by the utility model is typically in 2m or 4m, it is described hollow
Pipe 1-2 wall thickness 6.9mm or 10.3mm, the first groove 1-4 opened up on the hollow circular-tube 1-2 outer walls, the second groove 1-5,
3rd groove 1-6 and the 4th groove 1-7 cross sectional dimensions is 3mm × 3mm, and two hollow circular-tube 1-2 ends can be by interior
Adapter 1-3 is cementing, it is noted that groove aligns during docking.
Preferably, distribution type fiber-optic 1-1 is hard-pressed bale sheath straining and sensing optical fiber used by the utility model, optical fiber 1-
1 length is slightly larger than hollow circular-tube 1-2 joint lengths, and typically in 2.2 or 4.2m, it is pre- that hollow circular-tube 1-2 both ends respectively have more 0.1m
Optical fiber 1-1 length is stayed, and optical fiber 1-1 both ends are equipped with conversion extending connector 1-8；The first grooves of hollow circular-tube 1-2 1-4, second
Groove 1-5, the 3rd groove 1-6 and optical fiber 1-1 corresponding to the 4th groove 1-7 are using the 1-8 series connection of conversion extending connector, the distribution
Polyurethane elastomeric materials protective layer is packaged with the outside of formula optical fiber 1-1 fibre core, the diameter of the distribution type fiber-optic 1-1 is 2mm, weight
Amount is 2kg/km.
By embodiment 2, overcome traditional monitoring device and lay heavy scarce of inconvenience, operating difficulties, operator monitoring amount
Point, simple optical fiber 1-1 not only as sensing element again be signal transmission passage, it is not necessary to extra lead, to data acquisition transmit with
Construction is favourable, and can connect data acquisition and extractions when causing extensive lay of the optical fiber 1-1 of diverse location monitoring holes 3 is all relatively simple
Easy, more available for monitoring project, extensive monitoring cost is low, improves monitoring efficiency.
Embodiment 3：
A kind of preparation method of optical fiber test tube single segmental, its step are：
A, hollow circular-tube 1-2 joint length 4m and quantity 4 is determined according to the length 16m of tunneltron canopy supporting steel pipe 4,
Pocket Machining, i.e., the first groove opened up on hollow circular-tube 1-2 outer walls, the second groove, the 3rd groove are carried out to hollow circular-tube 1-2
Cross sectional dimensions with the 4th groove is 3mm × 3mm, the first grooves of hollow circular-tube 1-2 1-4, the second groove 1-5, the 3rd recessed
Angle between groove 1-6 and the 4th groove 1-7 is 180 degree, 90 degree (inverse time directions) and 90 degree (up time directions) respectively；
B, after the completion of slotting, the first grooves of hollow circular-tube 1-2 1-4, the second groove 1-5, the 3rd recessed is cleaned with absolute ethyl alcohol
Groove 1-6 and the 4th groove 1-7 sticking veneers, air-dry, it is ensured that bonding surface is clean, to ensure sticking Quality；
C, strict modulating epoxy resin in proportion, is first uniformly smeared along hollow circular-tube 1-2 one end the first groove 1-4
0.5mm thickness bottom epoxy resin, and in time along tight skin of the first groove 1-4 laying both ends with conversion extending connector 1-8
Optical fiber 1-1 pays attention to the optical fiber 1-1 of each reserved 0.1m length in both ends, this process will be really until hollow circular-tube 1-2 groove 1-4 ends
Guarantor optical fiber 1-1, which is suitably tightened, keeps straight, must not occur artificially causing optical fiber initial bending defect；Bottom asphalt mixtures modified by epoxy resin after 30 minutes
Fat reaches initial setting strength, re-modulates epoxy resin, and painting scrapes coating epoxy resin until reaching design coating layer thickness, makes epoxy
Resin aspect keeps basically identical with hollow circular-tube 1-2 outside wall surfaces；
D, the second groove 1-5, the 3rd groove 1-6 and the 4th groove 1-7 optical fiber 1-1 paste method and the first groove 1-4
Identical, concrete operations repeat step C once；
Embodiment of the present utility model is described in detail above in association with accompanying drawing, but the utility model is not limited to institute
The embodiment of description.For one of ordinary skill in the art, in principle of the present utility model and the scope of technological thought
It is interior, these embodiments are carried out with a variety of changes, modification, replaces and deforms, without departing from the ancestor of technical solutions of the utility model
Purport and scope, it all should cover among right of the present utility model.
Claims (5)
- A kind of 1. monitoring device of the tunnel wall rock deformation distribution type fiber-optic based on pipe shed support, it is characterised in that：It is by optical fiber Test tube single segmental（1）, optical fiber（1-1）, hollow circular-tube（1-2）, inner connecting tube（1-3）, the first groove（1-4）, the second groove（1- 5）, the 3rd groove（1-6）, the 4th groove（1-7）, extend crossover sub（1-8）, guide pipe（2）, monitoring holes（3）, pipe boron steel pipe （4）, slurry outlet（5）, be oriented to wall（6）, steel arch-shelf（7）, injected hole（8）, optical fiber introduction pipe（9）, rig（10）Composition, it is special Sign is：Optical fiber test tube single segmental（1）By optical fiber（1-1）, extend crossover sub（1-8）And hollow circular-tube（1-2）Composition, optical fiber Test tube single segmental（1）Lateral wall is provided with ortho-symmetric first groove（1-4）, the second groove（1-5）, the 3rd groove（1-6）With 4th groove（1-7）, optical fiber（1-1）Paste in groove surfaces, end, which is provided with, extends crossover sub（1-8）；Pipe boron steel pipe（4）In Empty and side wall is provided with slurry outlet（5）, guide pipe（2）Oblique cutting is in steel arch-shelf（7）On, it is being oriented to wall（6）It is upper that steel arch-shelf is housed（7）, Pipe boron steel pipe（4）Positioned at guide pipe（2）It is interior, optical fiber test tube single segmental single segmental（1）Positioned at pipe boron steel pipe（4）It is interior, rig（10） Drill bit passes through guide pipe（2）, rig（10）Drilling rod is located at pipe boron steel pipe（4）It is interior, in optical fiber test tube single segmental（1）One end is provided with light Fine introduction pipe（9）, in optical fiber introduction pipe（9）On be provided with injected hole（8）, monitoring holes（3）Optical fiber test tube single segmental（1）'s Sensor fibre（1-1）By extending crossover sub（1-8）Series connection.
- 2. a kind of monitoring device of tunnel wall rock deformation distribution type fiber-optic based on pipe shed support according to claim 1, It is characterized in that：Described optical fiber test tube single segmental（1）Including tight skin optical fiber（1-1）, conversion extending connector（1-8）And open circles Pipe（1-2）.
- 3. a kind of monitoring device of tunnel wall rock deformation distribution type fiber-optic based on pipe shed support according to claim 1, It is characterized in that：Described hollow circular-tube（1-2）Outer wall offer the first groove（1-4）, the second groove（1-5）, it is the 3rd recessed Groove（1-6）With the 4th groove（1-7）, described the first groove（1-4）, the second groove（1-5）, the 3rd groove（1-6）With the 4th Groove（1-7）Between angle be respectively 180 degree, 90 degree and 90 degree, described optical fiber test tube single segmental（1）The first groove （1-4）, the second groove（1-5）, the 3rd groove（1-6）With the 4th groove（1-7）The tight skin light for laying predetermined length is pasted respectively It is fine（1-1）, optical fiber end is equipped with conversion extending connector（1-8）.
- 4. a kind of monitoring device of tunnel wall rock deformation distribution type fiber-optic based on pipe shed support according to claim 1, It is characterized in that：Described hollow circular-tube（1-2）Single length is in 2 or 4m, described hollow circular-tube（1-2）External diameter it is not small In 40mm, hollow circular-tube（1-2）Wall thickness is not less than 5mm, described hollow circular-tube（1-2）The first groove opened up on outer wall（1- 4）, the second groove（1-5）, the 3rd groove（1-6）With the 4th groove（1-7）Cross sectional dimensions be 3mm × 3mm, two are hollow Pipe（1-2）End is cementing by inner connecting tube, groove alignment.
- 5. a kind of monitoring device of tunnel wall rock deformation distribution type fiber-optic based on pipe shed support according to claim 1, It is characterized in that：Described optical fiber（1-1）Length be more than hollow circular-tube（1-2）Joint length, in 2.2 or 4.2m, open circles Pipe（1-2）Both ends respectively have more 0.1m and reserve optical fiber（1-1）Length, optical fiber（1-1）Both ends are equipped with conversion extending connector（1-8）, Hollow circular-tube（1-2）, the first groove（1-4）, the second groove（1-5）, the 3rd groove（1-6）With the 4th groove（1-7）It is corresponding Optical fiber（1-1）Using conversion extending connector（1-8）Series connection, described optical fiber（1-1）Fibre core on the outside of be packaged with elastic polyurethane Material.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101590A (en) * | 2017-05-12 | 2017-08-29 | 中国科学院武汉岩土力学研究所 | Tunnel wall rock deformation distributed optical fiber sensing method and device based on pipe shed support |
| CN108663384A (en) * | 2018-06-08 | 2018-10-16 | 太原理工大学 | A kind of anchor pole detection without damage device and method based on TDR |
| CN109555549A (en) * | 2018-11-09 | 2019-04-02 | 中铁四局集团有限公司 | A kind of Railway Tunnel undercrossing tunnel long pipe shed and its stress test method |
| CN114705126A (en) * | 2022-01-26 | 2022-07-05 | 中煤科工生态环境科技有限公司 | Deep goaf optical fiber construction guiding device, process and full-stratum monitoring method |
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2017
- 2017-05-12 CN CN201720528355.7U patent/CN206772242U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101590A (en) * | 2017-05-12 | 2017-08-29 | 中国科学院武汉岩土力学研究所 | Tunnel wall rock deformation distributed optical fiber sensing method and device based on pipe shed support |
| CN108663384A (en) * | 2018-06-08 | 2018-10-16 | 太原理工大学 | A kind of anchor pole detection without damage device and method based on TDR |
| CN108663384B (en) * | 2018-06-08 | 2020-07-31 | 太原理工大学 | Anchor rod nondestructive testing device and method based on TDR |
| CN109555549A (en) * | 2018-11-09 | 2019-04-02 | 中铁四局集团有限公司 | A kind of Railway Tunnel undercrossing tunnel long pipe shed and its stress test method |
| CN114705126A (en) * | 2022-01-26 | 2022-07-05 | 中煤科工生态环境科技有限公司 | Deep goaf optical fiber construction guiding device, process and full-stratum monitoring method |
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