CN208860673U - A kind of transparent native experimental rig of simulation tunnel excavation face unstability - Google Patents
A kind of transparent native experimental rig of simulation tunnel excavation face unstability Download PDFInfo
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- CN208860673U CN208860673U CN201821358514.4U CN201821358514U CN208860673U CN 208860673 U CN208860673 U CN 208860673U CN 201821358514 U CN201821358514 U CN 201821358514U CN 208860673 U CN208860673 U CN 208860673U
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 38
- 238000004088 simulation Methods 0.000 title claims abstract description 22
- 239000002689 soil Substances 0.000 claims abstract description 42
- 238000010276 construction Methods 0.000 claims abstract description 8
- 239000012528 membrane Substances 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 abstract description 24
- 238000011160 research Methods 0.000 abstract description 10
- 238000012360 testing method Methods 0.000 description 16
- 230000005641 tunneling Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000002123 temporal effect Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- CVOFKRWYWCSDMA-UHFFFAOYSA-N 2-chloro-n-(2,6-diethylphenyl)-n-(methoxymethyl)acetamide;2,6-dinitro-n,n-dipropyl-4-(trifluoromethyl)aniline Chemical compound CCC1=CC=CC(CC)=C1N(COC)C(=O)CCl.CCCN(CCC)C1=C([N+]([O-])=O)C=C(C(F)(F)F)C=C1[N+]([O-])=O CVOFKRWYWCSDMA-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000009666 routine test Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The utility model relates to a kind of transparent native experimental rigs of simulation tunnel excavation face unstability, including the transparent mould molding box for accommodating transparent soil and for the pipeline in tunnel in construction simulation, pipeline one end is protruded into model casing, one end is stretched out outside model casing, it is characterized in that, keeping closed and relaxation by rubber membrane in the side of pipeline protruded into model casing；Pressure gauge is configured on pipeline, and the hose by being provided with air-stopping valve is connected with air compressor；In the cross laser device of model casing being fixedly arranged above for generating horizontal and vertical laser section；It is fixed with camera on model casing periphery, the image of camera shooting is admitted to computer.The utility model can be used to the generating process of dynamic analog excavation face unstable failure, and research influences to excavate the factors of face stability.
Description
Technical field
The utility model relates to a kind of transparent native experimental rigs of simulation tunnel excavation face unstability, open suitable for research shield
The temporal and spatial evolution that soil deformation destroys in the Instability of digging face.
Background technique
The history that shield machine comes out existing more than 190 years so far, starts from Britain, is developed in Japan, Germany.Due to shield method
Excavation causes ground settlement small, and driving speed is fast, and tunnel Forming Quality is preferable, and mechanization degree is high, low cost, has very high
Nowadays Technological Economy superiority has become most common method in underground tunnel project construction.Since shield tunneling is one three
The dynamic process promoted is tieed up, in the tunneling process of shield machine, tunnel circumferential direction land movement can be by applying section of jurisdiction lining in time
Block is controlled, but the tunneling direction in tunnel, no matter which kind of construction method is used, and guarantees the supporting that excavation face is stable and applies
The control of power is all difficult to fully equivalent in original crustal stress, and excavation face supporting power increases or reduces, can all cause around
The soil body occurs corresponding displacement or even major accident occurs, therefore indispensable for the research for excavating face stability.
Model test is because be convenient for Control experiment parameter and preferable economy, in the research of tunnel excavation face stability
It is widely applied.The existing tunnel excavation face Stability Model experimental evidence likelihood ratio determines the design size and mould of model casing
Displacement meter observing earth body surface is arranged on soil body surface layer in type soil, the Instability in excavation simulation face by way of displacement on cutting face
The soil deformation rule in face buries the soil pressure changing rule in soil pressure cell observation Instability in inside soil body, thus
Obtain the changing rule of excavation face unstable failure.
Although existing model test apparatus can be derived that before excavation face unstability and after unstability soil body table situation of change,
There are still more serious disadvantages:
(1) be not inconsistent with actual condition: the principal element for influencing excavation face stability is the size of supporting power, and supporting power is insufficient
Lead to excavation face unstability.And existing model test is using the process of displacement on cutting face simulation shield tunneling face unstable failure, test
Process major influence factors are the sizes of displacement rather than the change of supporting power, thus routine test not fully meets practical work
Condition is also unable to get the relationship of supporting power this major influence factors and soil body internal deformation.
(2) measurement limitation is larger: can only observe the changing rule that soil body surface settles in excavation face Instability, nothing
The deformation rule of method observation inside soil body.
(3) test data is distorted: being measured using exploration type measuring tool, the property that can change the test soil body has been sent out
Raw to change, there are various uncertainties for test result.
In recent years, the application with the development and digital image processing techniques of transparent soil model in geotechnical engineering, makes
The research that deformation must be carefully seen to inside soil body is possibly realized, and model test soil layer is used as using transparent soil, at digital picture
Reason technology, laser speckle technique, by excavation simulation face supporting power change procedure to during shield-tunneling construction around the digging face Jian it is native
Body deformation failure is observed, and obtains the temporal and spatial evolution of excavation face unstable failure overall process soil deformation destruction.
Utility model content
The purpose of the utility model is to provide a kind of experimental rigs of simulation tunnel excavation face unstability based on transparent soil, can
With the generating process of dynamic analog excavation face unstable failure, research influences to excavate the factors of face stability, applies for shield method
Work provides theoretical direction.Technical solution is as follows:
A kind of transparent native experimental rig of simulation tunnel excavation face unstability, including the transparent mould molding box for accommodating transparent soil
With the pipeline for being used to tunnel in construction simulation, pipeline one end is protruded into model casing, and one end is stretched out outside model casing, which is characterized in that
Closed and relaxation is kept by rubber membrane in the side of pipeline protruded into model casing；Pressure gauge is configured on pipeline, and by setting
The hose for being equipped with air-stopping valve is connected with air compressor；In being fixedly arranged above for generating horizontal and vertical laser for model casing
The cross laser device of section；It is fixed with camera on model casing periphery, the image of camera shooting is admitted to computer.
Preferably, the pipeline is pvc pipe.There are two the cameras, and one is located at the top of model casing, another
Positioned at the side of model casing.
The utility model has significant scientific research value and practical value, can carry out shield tunneling for construction and R&D institution
Face unstable failure law study opens up new approach.Compared with existing Shield Tunneling face stability experimental rig, this reality
Have the advantages that the following aspects with novel:
(1) generating process of the process simulation excavation face unstability reduced by simulation supporting power is adopted with conventional model test
It is compared with displacement method excavation simulation face destabilizing deflection curves, can more really simulate actual condition.
(2) mistake of excavation face unstability is led to by the supporting power deficiency in the Instability of excavation simulation face that reduces step by step of air pressure
Journey obtains the relationship of supporting power and soil deformation, provides for the variation of research supporting power and the changing rule and its relevance of the soil body
With reference to.
(3) deformation field that can non-contact, continuously measure excavation face unstability overall process inside soil body, is not destroying the soil body
The temporal and spatial evolution of the excavation face unstable failure overall process soil body is obtained under conditions of property.
(4) test influence factor is controllable.Compared to field test, can simulate supporting power, buried depth ratio, soil mass property etc. because
Influence of the element to face stability is excavated.Various experimental conditions can be controlled, research purpose is reached according to the difference of research variable.
Detailed description of the invention
Fig. 1 is the front view of entire experimental rig；
Fig. 2 is the side view of entire experimental rig；
Fig. 3 is the top view of main experimental device.
Experimental rig includes model assay systems and Image Acquisition, processing system.Figure label explanation: 1. model casings；
2.PVC pipe；3. rubber membrane；4. pressure gauge；5. hose；6. air compressor；7. air-stopping valve；8. vent valve；9. bracket；10.
Cross laser device；11.CCD camera；12.CCD camera；13. data line；14. four-way connection；15. transparent soil；16. computer.
Specific embodiment
The utility model is illustrated with embodiment with reference to the accompanying drawing.
As shown in Figure 1-3, the novel test device of the simulation tunnel excavation face unstable failure deformation of the utility model, utilizes
Pressure balance principle in physics by adjusting air pressure size dynamic analog excavation face unstable failure deformation in pvc pipe and is stablized
The influence of property.The utility model includes:
Transparent mould molding box 1 with a thickness of 15mm, carries out tunnel having a size of 40*30*50cm (long * wide * high) in model casing
Excavate test；
Pvc pipe 2, length 70cm, outer diameter 50mm, the tunnel with a thickness of 2mm, in construction simulation.2 one end of pvc pipe is protruded into
Hose and pneumatic shuttle are connected in 15cm in model casing, one end；
Rubber membrane 3, be fixed on protrude into model casing pvc pipe side keep it is closed and relaxation (loose purpose is to prevent rubber
Glue film itself interferes the Free Transform of the soil body)；
Pressure gauge 4, configuration measure intraductal atmospheric pressure on pvc pipe；
Vent valve 8 configures and stretches out the side of model casing in pvc pipe；
Hose 5 connects for connecting tunnel model and air compressor；
Four-way connection 14 connects pvc pipe, pressure gauge, hose, vent valve；
Air compressor 6, connection hose inject air pressure to pvc pipe；
Bracket 9 is used to suspension cross laser；
Cross laser device 10, the top for being suspended on model casing generate horizontal and vertical laser section；
CCD camera 11,21, two.The laser tangent plane picture of horizontal, the vertical both direction of the transparent soil of sync pulse jamming；
Data line 13, the image that transmission CCD camera is shot to computer；
Computer 16 is post-processed after receiving the image of CCD camera shooting using PIV software.
The application method of the utility model device, including the following steps:
(1) according to getting out testing equipment and equipment shown in Fig. 1.Suitable transparent soil is configured, simulation test soil sample is used for.
Check whether laser light source, CCD camera, pressurizing device can work normally, examination pressurization checks the air-tightness of pvc pipe.
(2) transparent soil is placed in model casing gradually to bury to specified altitude assignment, slowly fills air pressure in pvc pipe at the same time
To soil body static pressure, rubber membrane external and internal pressure is identical when the embedded completion of transparent soil, stands a period of time, excavation face is at this time
Initial stable state.
(3) cross laser device is opened, slowly enhancing laser intensity is enough to brightness, laser angle is reasonably adjusted, in model
The longitudinal direction at a vertical box bottom is respectively formed in case in front of pvc pipe rubber membrane at half of diametral distance and along pvc pipe section direction
With the laser section of lateral stable and uniform.Test preferably carries out in dark space during carrying out, the irradiation area of laser
Brighter, the effect for shooting imaging is also more preferable.
(4) CCD camera is opened, the position and height for adjusting camera make plane where its camera lens be parallel to model casing appearance
Face, adjustment viewing field of camera acquire image after can covering entire excavation face unstability face, and it is soft to be transferred to computer PIV by data line
Part carries out image procossing, forms inside soil body 3 D deformation field, is soil stabilization state before excavation face unstability.
(5) it opens air valve and reduces air pressure step by step, the variation of supporting power leads to excavation face unstability in the Instability of excavation simulation face
The process of destruction stands after the completion of the unloading of every level-one and uses imaging system after transparent soil deformation is substantially stabilized for a period of time
Data acquisition is carried out, the corresponding soil body 3 D deformation of supporting power at different levels field is obtained.
The utility model can be used to supporting power in the unstability overall process of excavation simulation face and change caused inside soil body three-dimensional
Deformation rule.
This method is simple and easy, and by rationally designing, it is broken can to analyze soil deformation in the unstability overall process of tunnel excavation face
Bad temporal and spatial evolution, and influence of the change of supporting power size to excavation face Instability can be analyzed, with Practical Project
It is more close.
Claims (3)
1. a kind of transparent native experimental rig of simulation tunnel excavation face unstability, including for accommodating transparent soil transparent mould molding box with
For the pipeline in tunnel in construction simulation, pipeline one end is protruded into model casing, and one end is stretched out outside model casing, which is characterized in that
The side of pipeline protruded into model casing keeps closed and relaxation by rubber membrane；Pressure gauge is configured on pipeline, and passes through setting
There is the hose of air-stopping valve to be connected with air compressor；It is cut in being fixedly arranged above for model casing for generating horizontal and vertical laser
The cross laser device in face；It is fixed with camera on model casing periphery, the image of camera shooting is admitted to computer.
2. experimental rig according to claim 1, which is characterized in that the pipeline is pvc pipe.
3. experimental rig according to claim 1, which is characterized in that there are two the cameras, and one is located at model casing
Top, another is located at the side of model casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821358514.4U CN208860673U (en) | 2018-08-22 | 2018-08-22 | A kind of transparent native experimental rig of simulation tunnel excavation face unstability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821358514.4U CN208860673U (en) | 2018-08-22 | 2018-08-22 | A kind of transparent native experimental rig of simulation tunnel excavation face unstability |
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| Publication Number | Publication Date |
|---|---|
| CN208860673U true CN208860673U (en) | 2019-05-14 |
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| CN201821358514.4U Expired - Fee Related CN208860673U (en) | 2018-08-22 | 2018-08-22 | A kind of transparent native experimental rig of simulation tunnel excavation face unstability |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060534A (en) * | 2018-08-22 | 2018-12-21 | 天津大学 | A kind of transparent native experimental rig of simulation tunnel excavation face unstability |
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2018
- 2018-08-22 CN CN201821358514.4U patent/CN208860673U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060534A (en) * | 2018-08-22 | 2018-12-21 | 天津大学 | A kind of transparent native experimental rig of simulation tunnel excavation face unstability |
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