CN106441653A - Method for monitoring stress and strain of tunnel open cut hole model in geo-mechanical model test - Google Patents
Method for monitoring stress and strain of tunnel open cut hole model in geo-mechanical model test Download PDFInfo
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- CN106441653A CN106441653A CN201610815469.XA CN201610815469A CN106441653A CN 106441653 A CN106441653 A CN 106441653A CN 201610815469 A CN201610815469 A CN 201610815469A CN 106441653 A CN106441653 A CN 106441653A
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- strain
- open cut
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 114
- 238000012360 testing method Methods 0.000 title claims abstract description 32
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- 239000000463 material Substances 0.000 claims description 13
- 239000003822 epoxy resin Substances 0.000 claims description 11
- 229920000647 polyepoxide Polymers 0.000 claims description 11
- 239000013307 optical fiber Substances 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
Abstract
The invention discloses a method for monitoring stress and strain of tunnel open cut hole model in geo-mechanical model test. The method can achieve precise monitoring, obtain information conveniently and is easy to implement. The method can be performed through the following steps: according to the test contents, determining monitoring sections; designing the monitoring sections on the surface of a pre-made tunnel open cut hole and making marks on the monitoring sections wherein each monitoring section is designed with monitoring elements according to the test contents of the monitoring sections; arranging strain monitoring elements in radial direction, axial direction and circumferential direction; installing the strain monitoring element in radial direction inside the open cut hole model structure; attaching the strain monitoring elements in the axial direction and the circumferential direction onto the surface of the open cut hole; and conducting the test by impacting the open cut hole model to monitor the strain rule of the open cut hole.
Description
Technical field
The present invention relates to a kind of geomechanical model test cut-and-cover tunnel model stress strain monitoring method.
Technical background
Along with China's rapid development of economy, country gets more and more to the investment of infrastructure construction, in Southwestern China
The Tunnel Engineering that area is built is increasing, is on the rise by the disaster accident that high gradient slope Dangerous Rock Body avalanche causes.To Rolling Stone
The Disaster Study of impact open cut tunnel, geomechanical model test is a kind of effective means, and open cut tunnel by effective monitoring of stress-strain is
The important step that guarantee test is effectively carried out.Fibre Optical Sensor has other traditional sensors institutes can not as emerging sensing technology
The advantage substituting：(1) fiber-optic grating sensor is by light wave reflection principle transmission information, and optical fiber is as optical fiber grating sensing
The carrier of device is the transmission medium of electric insulation, and therefore such sensor is not subject to disturbing of the electromagnetic field in the external world, and itself is safe and reliable.
(2) corrosion-resistant, there is coat on the surface due to optical fiber, and these coating substances are made up of macromolecular material, and this material can
The strong environment with chemical compositions such as soda acids uses for a long time, the Fibre Optical Sensor therefore possessing this characteristic is suitable for tying
The Long Period Health Monitoring of structure body.(3) certainty of measurement is high, and Fibre Optical Sensor adopts wavelength-modulation technique, and resolution can reach to be received
Meter level.Using the sensor that the interference technique of optical fiber and light wave makes this technology, there is high sensitivity.(4) small volume.
Because the core of Fibre Optical Sensor is the grating with certain wavelength, grating, when by external force or temperature change, can produce ripple
Fiber grating can be made the sensor of compact by long change according to this characteristic.
Existing some R＆D institutions carry out correlational study to Rolling Stone impact cut-and-cover tunnel at present, but majority takes in-situ test
With the method for numerical simulation, the former enforcement difficulty is larger, and the latter lacks certain reliability.Geomechanical model test can be kept away
Exempt from the problems referred to above and effectively studied.The present invention is directed to the crag avalanche Rolling Stone impact open cut tunnel model test intending carrying out and proposes
A kind of cut-and-cover tunnel model stress strain monitoring method, can effectively monitor the shock response to Rolling Stone for the open cut tunnel.
Content of the invention
The purpose of the present invention is exactly to solve the above problems, and provides a kind of geomechanical model test cut-and-cover tunnel model
Stress strain monitoring method, the method installs strain monitoring element on cut-and-cover tunnel model inside and surface, and Rolling Stone impacts open cut tunnel
Surface process, open cut tunnel axially, radially with ring due to corresponding strain can be produced by impulsive force, what different monitoring points obtained answers
Become data and Computer aided analysis are passed to by optical fiber, realize the research to Rolling Stone shock response rule for the cut-and-cover tunnel.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of geomechanical model test cut-and-cover tunnel model stress strain monitoring method, is arranged in cut-and-cover tunnel model
Multiple monitoring sections, are provided with the strain rule that axial direction, ring and radial direction monitoring element to monitor open cut tunnel on each monitoring section.
Further, the determination of described monitoring section requires to determine according to content of the test, including the quantity of monitoring section
And position.
Further, each described monitoring section according to content of the test be designed to left and right sides haunch, both sides spandrel with
And vault totally 5 monitoring element cloth set up an office.
Further, the distribution method of radial strain monitoring element is as follows：
Cut-and-cover tunnel model is radially bored aperture in each monitoring point, manually monitoring element is stretched by inside open-cut tunnel structure
Laterally, the circular shim making monitoring element is close to open cut tunnel inner surface, afterwards epoxide resin material is filled boring space, makes prison
Survey element and be fixed as an entirety with open cut tunnel.
Further, axially as follows with the distribution method of ring monitoring element：
At each monitoring point of cut-and-cover tunnel model, monitoring element is circumferentially attached to open cut tunnel surface, element with axial direction respectively
Two ends super glue is fixed, after monitoring element surface uniform application epoxide resin material so as to bonding with open cut tunnel surface.
Further, for monitoring axial direction, the monitoring element of ring be bareing FBG fiber grating element, element is with strong
Power glue is fixed, and is used for monitoring for protection element in monitoring element surface uniform application epoxide resin material.
Further, described radial direction monitoring element is using parcel for FBG fiber grating element radial strain sensor
The FB G fiber grating element of formula, its bottom is bonding with circular shim, when embedded, first according to EXPERIMENTAL DESIGN by open-cut tunnel structure along footpath
To boring, by stretching to outside inside open-cut tunnel structure, circular shim is close to open cut tunnel inner surface to radial direction monitoring element, afterwards by asphalt mixtures modified by epoxy resin
Boring space filled by fat material, makes monitoring element and open cut tunnel be fixed as an entirety.
Further, described axial, ring is connected with data storage and data processing equipment with radial direction monitoring element.
Beneficial effects of the present invention：
The present invention proposes open cut tunnel stress strain monitoring side in a kind of Rolling Stone impact cut-and-cover tunnel geomechanical model test
Method, Rolling Stone impact open cut tunnel during, each monitoring element cloth set up an office acquisition Monitoring Data pass through fiber-optic transfer to data processing
Device, the shock response rule to Rolling Stone for the comprehensive analysis open cut tunnel.Fiber grating element is safe and reliable, corrosion-resistant, small volume, measurement
High precision, can be used for effectively monitoring the strain rule of open cut tunnel.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is method implementing procedure figure；
Fig. 2 is open cut tunnel model schematic after monitoring element installation；
Fig. 3 is open cut tunnel model schematic after radial bore；
Wherein 1 open cut tunnel model；2 monitoring element cloth set up an office；3 monitoring sections；4 axial strain monitoring elements；5 radial strain prisons
Survey element；6 hoop strain monitoring elements；7 borings.
Specific embodiment
Below in conjunction with the accompanying drawings with certain Under-cross tunnel side slope crag avalanche Rolling Stone impact open cut tunnel geomechanical model test to this
Invention is described further.
As described in Fig. 2-3, open cut tunnel stress strain monitoring system in Rolling Stone impact cut-and-cover tunnel geomechanical model test, bag
Include axial strain monitoring element 4, radial strain monitoring element 5 and hoop strain monitoring element 6；Described axial strain monitoring unit
The data is activation that these are gathered by part 4, radial strain monitoring element 5 and hoop strain monitoring element 6 is to data processing unit.
Axial strain monitoring element 4, radial strain monitoring element 5 and hoop strain monitoring element 6 pass through optical fiber by data
Give data processing unit, data processing unit is analyzed to the data being gathered.
Specific monitoring method, comprises the following steps：
Step (1) requires to determine monitoring section 3 according to content of the test, including monitoring section 3 quantity and design attitude, pre-
Labelling is carried out at the cut-and-cover tunnel surface design monitoring section 3 making；
Each monitoring section 3 of step (2) designs left and right sides haunch, both sides spandrel and vault totally 5 according to content of the test
Individual monitoring element cloth sets up an office 2；
Step (3) lays radial strain monitoring element 5, by cut-and-cover tunnel model 1 in each monitoring point radially drill diameter
Monitoring element is manually close in open cut tunnel by the boring 7 for 1cm by stretching to outside, monitoring element circular shim inside open-cut tunnel structure
Epoxide resin material is filled boring space by surface afterwards, makes monitoring element and open cut tunnel be fixed as an entirety；
Step (4) lays axial direction and ring monitoring element 4,6, will monitor unit at each monitoring point of cut-and-cover tunnel model 1
Part respectively circumferentially be axially attached to open cut tunnel surface, element two ends super glue is fixed, uniform after monitoring element surface
Smear epoxide resin material so as to bonding with open cut tunnel surface, and play the effect of protection grating；
Step (5) carries out impacting open cut tunnel model test, monitoring open cut tunnel strain rule.
Further, each monitoring section design 5 monitoring element cloth set up an office, respectively both sides haunch, both sides spandrel with
And vault.
Further, for monitor axial direction, ring monitoring element be FBG fiber grating element, element super glue
Fixing, and it is used for monitoring for protection element in monitoring element surface uniform application epoxide resin material.
Further, the radial direction monitoring element that described radial direction monitoring element is described is for FBG fiber grating element footpath
Adopt the FBG fiber grating element of packaging type to strain transducer, its bottom is bonding with circular shim, when embedded, first according to examination
Test design open-cut tunnel structure is radially holed, monitoring element is close in open cut tunnel by stretching to outside, circular shim inside open-cut tunnel structure
Epoxide resin material is filled boring space by surface afterwards, makes monitoring element and open cut tunnel be fixed as an entirety.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not model is protected to the present invention
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not
Need to pay the various modifications that creative work can make or deformation still within protection scope of the present invention.
Claims (8)
1. a kind of geomechanical model test cut-and-cover tunnel model stress strain monitoring method it is characterised in that：In cut-and-cover tunnel
In model, multiple monitoring sections are set, axial direction, ring and radial direction monitoring element are provided with each monitoring section to monitor open cut tunnel
Strain rule.
2. geomechanical model test cut-and-cover tunnel model stress strain monitoring method as claimed in claim 1, its feature exists
In：The determination of described monitoring section requires determination, the quantity including monitoring section and position according to content of the test.
3. geomechanical model test cut-and-cover tunnel model stress strain monitoring method as claimed in claim 1 or 2, its feature
It is：Each described monitoring section is designed to left and right sides haunch, both sides spandrel and vault totally 5 prisons according to content of the test
Survey laying element point.
4. geomechanical model test cut-and-cover tunnel model stress strain monitoring method as claimed in claim 1, its feature exists
In：The distribution method of radial strain monitoring element is as follows：
Cut-and-cover tunnel model is radially bored aperture in each monitoring point, manually that monitoring element is outer by stretching to inside open-cut tunnel structure
Side, makes the circular shim of monitoring element be close to open cut tunnel inner surface, afterwards epoxide resin material is filled boring space, makes monitoring unit
Part and open cut tunnel are fixed as an entirety.
5. geomechanical model test cut-and-cover tunnel model stress strain monitoring method as claimed in claim 1, its feature exists
In：Axially as follows with the distribution method of ring monitoring element：
At each monitoring point of cut-and-cover tunnel model, monitoring element is circumferentially attached to open cut tunnel surface, element two ends with axial direction respectively
Fixed with super glue, after monitoring element surface uniform application epoxide resin material so as to bonding with open cut tunnel surface.
6. the geomechanical model test cut-and-cover tunnel model stress strain monitoring method as described in claim 1 or 5, its feature
It is：For monitor axial direction, ring monitoring element be FBG fiber grating element.
7. geomechanical model test cut-and-cover tunnel model stress strain monitoring method as claimed in claim 1 or 2, its feature
It is：Described radial direction monitoring element is the FBG optical fiber light adopting packaging type for FBG fiber grating element radial strain sensor
Grid element, its bottom is bonding with circular shim, when embedded, first according to EXPERIMENTAL DESIGN, open-cut tunnel structure is radially holed, radially supervises
Survey element and be close to open cut tunnel inner surface, afterwards epoxide resin material filled brill by stretching to outside, circular shim inside open-cut tunnel structure
Hole space, makes monitoring element and open cut tunnel be fixed as an entirety.
8. geomechanical model test cut-and-cover tunnel model stress strain monitoring method as claimed in claim 1 or 2, its feature
It is：Described axial, ring is connected with data storage and data processing equipment with radial direction monitoring element.
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| CN201610815469.XA CN106441653B (en) | 2016-09-12 | 2016-09-12 | A kind of geomechanical model test cut-and-cover tunnel model stress strain monitoring method |
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| CN201610815469.XA CN106441653B (en) | 2016-09-12 | 2016-09-12 | A kind of geomechanical model test cut-and-cover tunnel model stress strain monitoring method |
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| CN106441653B CN106441653B (en) | 2019-06-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764496A (en) * | 2017-09-12 | 2018-03-06 | 山东大学 | For simulating device, method and application of the rockfall motion to open cut tunnel impact |
| CN109781021A (en) * | 2019-01-22 | 2019-05-21 | 浙江工业大学 | The fiber-optic grating sensor predicted for real-time monitoring reinforcing bar surrounding concrete rust crack strain field in situ and rust crack |
| CN113008157A (en) * | 2021-04-26 | 2021-06-22 | 黄河勘测规划设计研究院有限公司 | Tunnel boring machine shield inner surface deformation monitoring method |
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| CN101713691A (en) * | 2009-12-22 | 2010-05-26 | 浙江大学 | Health-monitoring system of distributed sensing fiber tunnel |
| KR20100138401A (en) * | 2009-06-25 | 2010-12-31 | (주)카이센 | Apparatus for measuring the radial movements and convergence of tunnel |
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| KR20100138401A (en) * | 2009-06-25 | 2010-12-31 | (주)카이센 | Apparatus for measuring the radial movements and convergence of tunnel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764496A (en) * | 2017-09-12 | 2018-03-06 | 山东大学 | For simulating device, method and application of the rockfall motion to open cut tunnel impact |
| CN109781021A (en) * | 2019-01-22 | 2019-05-21 | 浙江工业大学 | The fiber-optic grating sensor predicted for real-time monitoring reinforcing bar surrounding concrete rust crack strain field in situ and rust crack |
| CN113008157A (en) * | 2021-04-26 | 2021-06-22 | 黄河勘测规划设计研究院有限公司 | Tunnel boring machine shield inner surface deformation monitoring method |
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| CN106441653B (en) | 2019-06-14 |
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