CN108871222A - A kind of wide range fiber grating aperture deformation gauge and its check method - Google Patents
A kind of wide range fiber grating aperture deformation gauge and its check method Download PDFInfo
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- CN108871222A CN108871222A CN201810884334.8A CN201810884334A CN108871222A CN 108871222 A CN108871222 A CN 108871222A CN 201810884334 A CN201810884334 A CN 201810884334A CN 108871222 A CN108871222 A CN 108871222A
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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Abstract
This application discloses a kind of wide range fiber grating aperture deformation gauge and its check method, deformation gauge includes：Shell；It is disposed in the housing the fixing substrate in portion comprising the rigid connector that only radially can rigidly move of a pair of axially disposed and relative to deformation gauge axle center symmetrically arranged cantilever beam and two cantilever beams of connection；Rigid force transmission element is set on the cantilever beam, have towards outside and protrude from the shell to the protruding portion that is contacted with borehole sidewall, when the borehole sidewall deforms, the protruding portion drives the cantilever beam that corresponding deflection deformation occurs；Measurement fiber grating on the cantilever beam, grating wavelength change with the variation of the cantilever beam deflection.
Description
Technical field
The present disclosure relates generally to underground engineering wall rock stress test fields, and in particular to a kind of to measure surrouding rock stress for a long time
Wide range fiber grating aperture deformation gauge and its check method.
Background technique
With the increase of coal mining depth, geological conditions becomes increasingly complex, and surrouding rock stress is continuously increased, bump calamity
Evil tendentiousness constantly enhances, and seriously threatens the safety of personnel in the pit and equipment.Stress field of the surrounding rock directly influences rock coal body
Stress, deformation and destruction are the basic datas of predicting rock burst disaster；Therefore, long-term accurate measurements surrouding rock stress is to prediction
Rock blast hazard directive function with higher.
Aperture deforming method is development time longest, a kind of surrouding rock stress test method of Technical comparing maturation.With extensive
Applicability and higher reliability.Traditional aperture deforming method is to be calculated by measuring the deformation of bore diameter perpendicular to brill
Stress state in the plane of axially bored line, and determine by the measurement of three mutual unequal drillings the three-dimensional stress constraint of a bit.
Since aperture deforming method is not necessarily to that sensor and palisades stick together by glue, installation process is simple, influence factor is few, measurement
Precision is high.But currently used aperture deformation gauge is by foil gauge come calculated hole diameters deformation and corresponding surrouding rock stress.Due to electricity
The corrosion-resistant and electromagnetism interference of resistive foil gauge is poor, it is difficult to being used in underground complex electromagnetic fields condition.Simultaneously as electric
Hinder that easily drift occurs for foil gauge in temperature change and attenuated output signal is fast, it can not adaptive temperature variation be obvious, adopts over long distances
The conditions such as collection and transmission.Therefore, currently used aperture deformation gauge be only used for the country rock stress of primary rock it is short-term measurement in and cannot
Apply to the long term monitoring of surrouding rock stress.
Optical fiber grating sensing is a kind of New Sensing Technology, and fiber grating is adhered on substrate by it, when substrate is by external force
When deformation, the wavelength of grating can change, and deformation and the stress of substrate are calculated by the variation of grating wavelength.Open file
[publication number：CN107328370A, CN206818160U] it is based on theory of the fiber optical, fiber grating is fixed on steel loop
On, solve the technical issues of long term monitoring surrouding rock stress；But due to the limitation of structure type, maximum range is no more than 1.0
mm.When meeting relatively soft country rock and the larger situation of stress variation, boring aperture deforms larger, the disclosure sensor fiber light
Chirp phenomenon can occur for grid, can not the variation of accurate measurements surrouding rock stress.Therefore, be badly in need of develop one kind can long term monitoring country rock answer
The wide range fiber grating aperture deformation gauge of power, the technical issues of to solve stress long term monitoring in different surrounding rock type.
Summary of the invention
In view of drawbacks described above in the prior art or deficiency, it is intended to provide a kind of wide range light of long-term measurement surrouding rock stress
Fine grating aperture deformation gauge and its check method.
In a first aspect, the wide range fiber grating aperture that the embodiment of the present application provides a kind of long-term measurement surrouding rock stress becomes
Shape meter, including：
Shell；
It is disposed in the housing the fixing substrate in portion comprising axle center pair at least a pair of axially disposed and relative to deformation gauge
Claim the cantilever beam of setting and connects the rigid connector that only radially can rigidly move of two cantilever beams；
Rigid force transmission element, be set to the cantilever beam on, have towards outside and protrude from the shell to drilling side
The protruding portion of wall contact, when the borehole sidewall deforms, the protruding portion drives the cantilever beam generation to scratch accordingly
Degree deformation；
Measurement fiber grating on the cantilever beam, grating wavelength become with the variation of the cantilever beam deflection
Change.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
The cantilever beam includes beam of uniform strength area, and the fiber grating is located at the beam of uniform strength area, even if two surveys
It is variant along the installation site of cantilever beam to measure fiber grating, also can guarantee what corresponding two fiber gratings of each pair of cantilever beam measured
Wavelength change is equal, i.e.,, it is ensured that the Stability and veracity of monitoring numerical value.
The measurement fiber grating is at least arranged four pairs, and four pairs of measurement fiber gratings are in the shell along cross section
It is uniformly distributed in circular projection.I.e. four pairs measurement fiber gratings are evenly arranged in the projection of vertical axis plane, local coordinate
0 °, 45 °, 90 °, 135 ° is respectively corresponded under system.
According to theory of elastic mechanics, there are following relationships for each wavelength change for measuring fiber grating.During actual monitoring, above-mentioned relation can be used, result is tested and checked,
It can reject in time unreasonable as a result, monitoring accuracy greatly improved.
The cantilever beam is made of spring steel.
Deformation gauge further includes the hold-down support the fixing substrate is arranged.
The hold-down support includes the support interconnecting piece being fixedly connected with the casing and the base the fixing substrate is arranged
Material fixed part.
The substrate fixed part be it is columnar structured, which is provided with the via hole passed through to the rigid connector, it is described
The size of via hole and the sectional dimension of the rigid connector match, and limit the rotation of the rigid connector, to guarantee
Rigid movement only can radially occur in rigid connector.
The hold-down support includes fixed to the first hold-down support component of the same rigid connector of fixation and second
Support, first and second hold-down support are fixed in the shell, and first hold-down support is equipped with the first mistake
Hole, second hold-down support are equipped with the second via hole, and first and second via hole is to pass through the rigid connector simultaneously
The rigidity for only allowing the rigid connector to occur radially is mobile.
Deformation gauge further includes the temperature compensation fiber grating in free deformation set on the housing rear end.
Second aspect, the embodiment of the present application also provides a kind of wide range fiber grating apertures of long-term measurement surrouding rock stress
The check method of deformation gauge, includes the following steps：
The center that deformation gauge is set to plexiglass block is run through in circular hole, uniform in material, the isotropism of the plexiglass block；
Pressure is applied to the plexiglass block, the direction of the pressure is hung down with the plane for being parallel to the round hole axial direction
Directly, examine whether the variation of measurement optic fiber grating wavelength and pressure change in different direction are in good linear relationship, if it is not, then
Deformation gauge is checked unqualified；
Examine corresponding two optic fiber grating wavelengths variation on each pair of cantilever beam whether equal, if it is not, then the deformation gauge is checked
It is unqualified；
It examines the sum of two teams' optic fiber grating wavelength changing value to offset one from another and the sum of another two pairs of fibre grating wavelength changing value is
It is no equal, if it is not, then the deformation gauge check is unqualified.
Fiber grating aperture provided by the embodiments of the present application deformation gauge is based on theory of the fiber optical, and by optical fiber light
Grid are welded on the cantilever beam by spring steel production, and rigid movement can radially occur for pairs of cantilever beam, it is ensured that
The accuracy of measurement.Above structure ensure that deformation gauge has electromagnetism interference, corrosion-resistant, precision is high, long-time stability are good etc.
Feature.Meanwhile the embodiment of the present application uses cantilever beam for fiber grating substrate, can adjust deformation gauge by adjusting the length of beam
Range, can adapt to the surrouding rock stress long term monitoring under the conditions of different lithology, different stress level, improve the suitable of deformation gauge
With range, to solve the problems, such as country rock triaxiality long term monitoring under complex environment.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon：
Fig. 1 shows deformation gauge structural schematic diagram in the embodiment of the present application；
Fig. 2 shows hold-down support structural schematic diagrams in the embodiment of the present application；
Fig. 3 shows cantilever beam distribution map in the embodiment of the present application；
Fig. 4 shows cantilever beam front view in the embodiment of the present application；
Fig. 5 shows cantilever beam top view in the embodiment of the present application；
Fig. 6 shows cantilever beam left view in the embodiment of the present application；
Fig. 7 shows the deformation of the embodiment of the present application middle hole wall and measurement optic fiber grating wavelength change curve；
Fig. 8 shows precision calibration test in the embodiment of the present application and applies pressure and each optic fiber grating wavelength variation relation curve；
Fig. 9 shows precision calibration in the embodiment of the present application and tests two optic fiber grating wavelength change curves on each pair of cantilever beam；
Figure 10 shows precision calibration in the embodiment of the present application and tests different direction fiber grating change curve；
Figure 11, which is shown, measures optic fiber grating wavelength change curve under the conditions of different distortion amount in the embodiment of the present application；
Figure 12 shows strain gauge Stress calculation error result in beam type aperture in the embodiment of the present application；
Figure 13 shows hold-down support structure front view in another embodiment of the application.
Wherein, 1- stainless steel casing, 2- hold-down support, 3- cantilever beam, 4- measure fiber grating, 5- power transmission cap, 6- temperature compensation
Fiber grating, 7- armored optical cable, 8- rigid connector, 9- support interconnecting piece, 10- substrate fixed part, the first hold-down support of 11-,
The second hold-down support of 12-.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described.Obviously, described embodiment is
A part of the invention is instead of all the embodiments.For ease of description, part relevant to invention is illustrated only in attached drawing.
It should be noted that in the absence of conflict, the embodiment of the present invention for usually describing and showing in this figure
Component can arrange and design with a variety of different configurations.It is understood that specific embodiment described herein is only
It is only used for explaining related invention, rather than the restriction to the invention.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", " axial direction ", " transverse direction ", "vertical", " water
It is flat ", "inner", the instructions such as "outside" orientation or positional relationship be to be based on the orientation or positional relationship shown in the drawings, merely to just
In description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with
Specific orientation construction and operation, therefore be not considered as limiting the invention.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, belong to " setting ",
" connection " should broadly understood, for example, it may be being fixedly connected, may be a detachable connection, or the connection of one；It can be
Mechanical connection, is also possible to be electrically connected；It can be and be directly connected to, can also be indirectly connected with by intermediary, can be two
Connection inside element.For the ordinary skill in the art, visual concrete condition understands above-mentioned term in the present invention
In concrete meaning.
Referring to FIG. 1, it illustrates a kind of fiber grating aperture deformation-sensor of long-term measurement surrouding rock stress, it is main to wrap
Include stainless steel casing 1, hold-down support 2, cantilever beam 3, measurement fiber grating 4, power transmission cap 5, temperature compensation fiber grating 6, armored optical cable
7。
Stainless steel casing 1 use stainless steel material, be divided into three sections along axis, leading portion is hemispherical, into drilling when from lead
To effect, the radius of a ball is 3 cm；Cylindrical cavity is opened in middle part and rear end, and middle part is mainly cylinder to arrange measure setup
Shape, long 12 cm, outer diameter take 34 mm, and thickness takes 4 mm；Rear end is conical section, for the fixed sensor of clamping palisades, wall thickness 4
Mm, long 10 cm.
Hold-down support is bolted in the cavity of stainless steel casing, using stainless steel material, is consisted of three parts,
Front end be to as support interconnecting piece 9 disk, fix with stainless steel casing, middle part is the cylinder as substrate fixed part 10
Body, is used for cantilever mounted beam, and rear end is the disk with threading hole, the channel as optical fiber.The front and back end of hold-down support 2 is equal
Use outer diameter for the disk of 28mm, height 5mm；Centre is the cylindrical body that outer diameter is 20 mm, highly takes 8cm.Cantilever beam is set in pairs
It sets, is connected between each pair of cantilever beam by rigid connector 8, as shown in Figure 4.Cylindrical body is equipped with diametrically disposed use
The cross sectional shape size of the through hole passed through with rigid connector, through hole is roughly the same with the sectional dimension of rigid connector,
To make rigid connector pass through axle center, can radially free movement, and the rotation of restraint rigidity connector and along other directions
Movement.The displacement for the fixing end that cantilever beam is connect with rigid connector is fixed support restriction, therefore cantilever beam can only occur
It moves radially and cannot rotate or circumferential displacement.
Cantilever beam is the beam of uniform strength being fabricated to by spring steel, i.e., when cantilever beam deforms beam surface any position strain facies
Together；It uses 60Si2MnA spring steel material, long 35 mm, and thickness takes 1 mm, width 3-6 mm（Linear change）.
In the present embodiment, four pairs of cantilever beams are set.It is worth noting that, even if setting is less than four pairs, is even arranged
A pair of of cantilever beam, since it is also capable of measuring some or certain several diametric deflections, also in the protection scope of the application
Within.
In the embodiment of the present application, four pairs of cantilever beams are equidistantly arranged along deformation gauge axis direction（7 mm of adjacent spaces）,
It is evenly arranged in vertical axis plane（As shown in figure 3, respectively corresponding 0 °, 45 °, 90 °, 135 ° under local coordinate system）.Measure light
Fine grating 4 is welded on 3 inside equal strength region of cantilever beam, as shown in figure 4, fiber grating measurement cantilever beam bending direction strain.
It is understood that above-mentioned hold-down support can also realize corresponding function using other concrete forms.Such as
Substrate fixed part 10 to fix a rigid connector is also possible to two components of axially symmetric setting, each component
It can be overall structure, be also possible to dismountable structure.As long as hold-down support includes the support to be fixedly connected with shell
Interconnecting piece, and the via hole passed through to rigid connector, the rigidity which only allows rigid connector to occur radially is mobile,
Within the scope of protection of this application.As Figure 13 only marks a pair of of substrate it illustrates some specific embodiment in figure
The case where fixed part and a pair of of cantilever beam：Substrate fixed part 10 includes the first fixed branch to the same rigid connector of fixation
Seat 11 and the second hold-down support 12, first and second hold-down support are fixed in the shell, and described first is fixed
Support is equipped with the first via hole, and second hold-down support is equipped with the second via hole, and first and second via hole is to pass through
The rigid connector 8 simultaneously only allows the rigidity of the rigid connector generation radially mobile.In such an embodiment, same
A rigid connector is fixed on the fixing piece with via hole that two are oppositely arranged, and if necessary to four pairs of cantilever beams, is then needed
Want corresponding four pairs of hold-down supports.
Power transmission cap 5 as rigid force transmission element uses stainless steel material, and front end is contacted with hole wall, is half that diameter is 5 mm
It is spherical；Rear end is the cylinder contacted with cantilever beam, a diameter of 5 mm.
It is understood that rigid force transmission element is not limited to above-mentioned specific structure type, " it is set to described outstanding as long as meeting
On arm beam, have towards outside and protrude from the shell to the protruding portion that is contacted with borehole sidewall, when the drilling side
When wall deforms, it is equal that the protruding portion drives the cantilever beam that corresponding deflection deformation occurs ", in the protection model of the application
Within enclosing.
Fiber grating 4 and 6 grid region length of temperature compensation grating, 6 mm are measured, center wavelength variation range is ± 3 nm.
Temperature compensation fiber grating 6 is located at 1 rear end of stainless steel casing, free deformation is in, for measuring temperature change.4
Measurement fiber grating and 1 temperature compensation fiber grating are carried out behind sensor rear end and 7 welding of armored optical cable with optical fibre interrogation instrument
Communication.
Surrouding rock deformation is transferred on cantilever beam during test.There is 1 measurement fiber grating on each cantilever beam, is located at
The inner surface equal strength area of cantilever beam, for measuring cantilever beam surface strain.Each measurement optical fiber light is read by optical fibre interrogation instrument
The wavelength change of grid and temperature compensation fiber grating, and then hole wall deformation and surrouding rock stress is calculated.
To test to the precision of the invention, ad hoc fixed following rating test：
(1) cantilever beam deformation-wavelength change calibration：Deformation gauge is placed on displacement calibrating frame and connects optical fibre interrogation
Instrument.By applying different deformations to cantilever beam, the measurement optic fiber grating wavelength variation under the conditions of different distortion is obtained.Such as Fig. 7
It is shown, it can be seen from the figure that grating wavelength variation is continuously increased, the two as cantilever beam loading end deflection is continuously increased
Close to linear relationship:U=d λ.Meanwhile deformation gauge maximum deformation quantity reaches 3mm, the range of more existing deformation gauge, which has, substantially to be mentioned
It is high.
(2) sensor accuracy is checked：
The first step：Deformation gauge is installed.Uniform in material, isotropic plexiglass block is chosen, having a size of 30cm × 30cm
× 30cm, wherein opening diameter in the center of plexiglass block one side is 38mm through circular hole.Sensor is mounted on circle
Kong Zhong makes cantilever beam have certain initial compression amount by adjusting power transmission cap length.The armored optical cable 7 of deformation gauge rear end is connected
(FBG) demodulator is connect, is recorded by wavelength of the computer to each fiber grating.
Second step：Load.Plexiglass block is placed on rigid servo-pressing machine, round hole axial direction is being parallel to
Plane on apply pressure.Fig. 8 is that different direction optic fiber grating wavelength changes with pressure history.It can be seen from the figure that
Optic fiber grating wavelength variation has good linear relationship with pressure change in different direction.
Third step：It examines and checks.Firstly, examining two optic fiber grating wavelength variations on each pair of cantilever beam whether equal.Such as
Shown in Fig. 9, it can be seen from the figure that two optic fiber grating wavelengths variation in 0 ° of orientation is of substantially equal, excess-three is to also with phase
Like rule.Secondly, whether equal, it can be seen from fig. 10 that 0 °+90 ° if 4 different direction wavelength changes being examined to be added two-by-two
It is of substantially equal with 45 °+135 °.Can excessively above-mentioned inspection show that test result is reliable.
4th step：Stress calculation.According to different direction optic fiber grating wavelength variable quantity in Fig. 8, according to wavelength variable quantity and cantilever
Beam deforms the relationship-u=d λ between (hole wall deformation), and the hole wall deformation of different direction can be obtained；Then it is studied the science using elastic force
By, it is known that the elasticity modulus of organic glass is 2.7GPa, and Poisson's ratio is calculated plexiglass block for 0.3 and puts down in vertical drilling
Three components of stress in face, as shown in figure 12.Corresponding mistake is calculated in the pressure value of comparing calculation value and actual implementation
Difference.In figure 12 it can be seen that the pressure value worst error that the deformation gauge measures is about 7%.Thus prove that the deformation gauge has
Good precision.
(3) deformation gauge long-time stability are checked
Different displacements is applied to overhanging beam both ends using displacement calibrating frame, and guarantees to be displaced constant, is examined by the variation of wavelength
Survey the long-time stability of deformation gauge.It can be seen from figure 11 that apply in 14 days time, optic fiber grating wavelength almost without
Variation, it was demonstrated that the deformation gauge has good long-time stability, can adapt to the requirement of long term monitoring.
The embodiment of the present application compared with prior art, has the following advantages that and effect：
The embodiment of the present application be based on fiber grating sensing technology, overcome traditional resistive surrouding rock stress sensor poor anti-interference,
The problems such as perishable, temperature drift；It uses the beam of uniform strength for grating substrate, the scope of application of deformation gauge greatly improved；To
Solves the problems, such as country rock triaxiality long term monitoring under complex environment.
It is based on theory of the fiber optical in the embodiment of the present application, and fiber grating is welded on by the outstanding of spring steel production
On arm beam.Above structure ensure that deformation gauge has the characteristics that electromagnetism interference, corrosion-resistant, precision is high, long-time stability are good.Together
When, it is fiber grating substrate that the embodiment of the present application, which is used in cantilever beam, and the amount of deformation gauge can be adjusted by adjusting the length of beam
Journey can adapt to the surrouding rock stress long term monitoring under the conditions of different lithology, different stress levels, improve the applicable model of deformation gauge
It encloses.
Cantilever beam uses the beam of uniform strength in the embodiment of the present application, and fiber grating is fixed on the equal strength area of cantilever beam, and every
Cantilever beam can be moved radially；To ensure that the wavelength change phase that corresponding two fiber gratings of each pair of cantilever beam measure
Deng that is,.Meanwhile four pairs of cantilever beams are uniformly distributed in the plane of vertical deformation meter axis direction（Respectively correspond
0 ° under local coordinate system, 45 °, 90 °, 135 °）, according to theory of elastic mechanics, there are following relationships.During actual monitoring, above-mentioned two relationship can be used and test to result and school
Core can reject unreasonable as a result, monitoring accuracy greatly improved in time.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art
Member is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
Any combination and the other technical solutions formed.Such as features described above has similar function with (but being not limited to) disclosed herein
Can technical characteristic replaced mutually and the technical solution that is formed.
Claims (10)
1. a kind of wide range fiber grating aperture deformation gauge of long-term measurement surrouding rock stress, which is characterized in that including：
Shell；
It is disposed in the housing the fixing substrate in portion comprising axle center pair at least a pair of axially disposed and relative to deformation gauge
Claim the cantilever beam of setting and connects the rigid connector that only radially can rigidly move of two cantilever beams；
Rigid force transmission element, be set to the cantilever beam on, have towards outside and protrude from the shell to drilling side
The protruding portion of wall contact, when the borehole sidewall deforms, the protruding portion drives the cantilever beam generation to scratch accordingly
Degree deformation；
Measurement fiber grating on the cantilever beam, grating wavelength become with the variation of the cantilever beam deflection
Change.
2. the wide range fiber grating aperture deformation gauge of long-term measurement surrouding rock stress according to claim 1, feature exist
In the cantilever beam includes beam of uniform strength area, and the fiber grating is located at the beam of uniform strength area.
3. the wide range fiber grating aperture deformation gauge of long-term measurement surrouding rock stress according to claim 2, feature exist
In the measurement fiber grating is at least arranged four pairs, and four pairs of measurement fiber gratings are in the shell along the circle of cross section
It is uniformly distributed in projection.
4. the wide range fiber grating aperture deformation gauge of long-term measurement surrouding rock stress according to claim 1, feature exist
In the cantilever beam is made of spring steel.
5. the wide range fiber grating aperture deformation gauge of long-term measurement surrouding rock stress according to claim 1, feature exist
In the deformation gauge further includes the hold-down support the fixing substrate is arranged.
6. the wide range fiber grating aperture deformation gauge of long-term measurement surrouding rock stress according to claim 5, feature exist
In the hold-down support includes that the support interconnecting piece being fixedly connected with the casing and the substrate the fixing substrate is arranged are fixed
Portion.
7. the wide range fiber grating aperture deformation gauge of long-term measurement surrouding rock stress according to claim 6, feature exist
In the substrate fixed part is cylindrical structure, which is provided with the through hole passed through to the rigid connector, the perforation
The size in hole and the sectional dimension of the rigid connector match, and only allow the rigid connector that radially rigid occurs
Property it is mobile.
8. the wide range fiber grating aperture deformation gauge of long-term measurement surrouding rock stress according to claim 5, feature exist
In the hold-down support includes the first hold-down support and the second hold-down support to the same rigid connector of fixation, described
First and second hold-down supports are fixed in the shell, and first hold-down support is equipped with the first via hole, and described the
Two hold-down supports are equipped with the second via hole, and first and second via hole is to pass through the rigid connector and only allow institute
It is mobile to state the rigidity that rigid connector occurs radially.
9. the wide range fiber grating aperture deformation gauge of long-term measurement surrouding rock stress according to claim 1, feature exist
In deformation gauge further includes the temperature compensation fiber grating in free deformation set on the housing rear end.
10. a kind of check method of the wide range fiber grating aperture deformation gauge of long-term measurement surrouding rock stress, which is characterized in that packet
Include following steps：
The center that deformation gauge is set to plexiglass block is run through in circular hole, uniform in material, the isotropism of the plexiglass block；
Pressure is applied to the plexiglass block, the direction of the pressure is hung down with the plane for being parallel to the round hole axial direction
Directly, examine whether the variation of measurement optic fiber grating wavelength and pressure change in different direction are in good linear relationship, if it is not, then
Deformation gauge is checked unqualified；
Examine corresponding two optic fiber grating wavelengths variation on each pair of cantilever beam whether equal, if it is not, then the deformation gauge is checked
It is unqualified；
It examines the sum of two teams' optic fiber grating wavelength changing value to offset one from another and the sum of another two pairs of fibre grating wavelength changing value is
It is no equal, if it is not, then the deformation gauge check is unqualified.
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