CN110243677A - Shield duct piece steel bar corrosion causes the test method of Stiffness Deterioration under a kind of multifactor effect - Google Patents
Shield duct piece steel bar corrosion causes the test method of Stiffness Deterioration under a kind of multifactor effect Download PDFInfo
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- CN110243677A CN110243677A CN201910429341.3A CN201910429341A CN110243677A CN 110243677 A CN110243677 A CN 110243677A CN 201910429341 A CN201910429341 A CN 201910429341A CN 110243677 A CN110243677 A CN 110243677A
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- 238000005260 corrosion Methods 0.000 title claims abstract description 28
- 230000007797 corrosion Effects 0.000 title claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 23
- 239000010959 steel Substances 0.000 title claims abstract description 23
- 230000006866 deterioration Effects 0.000 title claims abstract description 17
- 230000000694 effects Effects 0.000 title claims abstract description 17
- 238000010998 test method Methods 0.000 title claims abstract description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 31
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 239000004567 concrete Substances 0.000 claims abstract description 21
- 238000006073 displacement reaction Methods 0.000 claims abstract description 15
- 238000013461 design Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 15
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 11
- 240000002853 Nelumbo nucifera Species 0.000 claims description 10
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims description 10
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims description 10
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 238000010835 comparative analysis Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims 1
- 238000006748 scratching Methods 0.000 claims 1
- 230000002393 scratching effect Effects 0.000 claims 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 230000009916 joint effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 206010050031 Muscle strain Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The present invention relates to the test methods that shield duct piece steel bar corrosion under a kind of multifactor effect causes Stiffness Deterioration, comprising the following steps: S1: the detection contact of strain acquirement instrument and displacement acquisition instrument is set on shield duct piece；S2: shield duct piece is held between pressure apparatus, increases chucking power and the load of shield duct piece is made to reach design load, and keep load constant；S3: Chloride Solution device is placed；S4: access power device carries out continuing energization；S5: taking out armored concrete test block inside from shield duct piece, using the section of CT scanner scanning armored concrete test block；S6: the loading status so that shield duct piece reaches capacity, observing crack by crack observer, a situation arises；S7: reflect the degenerate case of shield duct piece rigidity by amount of deflection, internal force and the variation in crack.Compared with prior art, the external influence factors that the present invention considers more comprehensively, contain chloride ion, stray electrical current and external loads, are more consistent with Practical Project environment.
Description
Technical field
The present invention relates to a kind of structural behaviour test methods of shield duct piece, more particularly, to shield under a kind of multifactor effect
Structure section of jurisdiction steel bar corrosion causes the test method of Stiffness Deterioration.
Background technique
With greatly developing for city underground, shield method as it is safe and environment-friendly, quickly build means, in subway tunnel
It is widely applied in building.However, shield tunnel is buried in underground, the variation of external loads can make outside shield duct piece structure
Cambered surface generates microcrack, extraneous etching medium and oxygen gas and water can penetrate into rebar surface by crack again, induce section of jurisdiction reinforcing bar
Corrode.Furthermore with the accumulation of percolating water and dust and dirt, the insulation effect of rail over the ground is gradually decreased, by subway leakage
Stray electrical current can promote the rusting rate of reinforcing bar, since the volume of steel bar corrosion product is 2~7 times of normal reinforcing bar, once pipe
Steel bar corrosion in piece, the splitting stresses of appearance are easy to cause the problems such as concrete cracking and protective layer peel off, seriously
Threaten the safety of metro operation.
Currently, most of scholar replaces true shield duct piece using the model section of jurisdiction of rectangular elements or small scale, test
Single or two factors act on the decline situation that lower shield duct piece steel bar corrosion causes bending stiffness.However the variation of the rigidity of structure
Rule is closely related with structure type, and in practical situations, the corrosion of duct pieces of shield tunnel is by external loads, stray electrical current
And chloride ion joint effect, the excessive rigidity that can not accurately measure shield duct piece of the difference of structure type or external condition is moved back
Change situation.
CN109443930A discloses a kind of shield tunnel segment lining structure longitudinal rigidity test device and method, test
Device includes two bottom brackets being parallel to each other, and is equipped with fixed frame on bottom bracket；Adjustable shelf is equipped with two between bottom bracket
A bearing beam being parallel to each other is equipped with sliding panel, sliding panel and the cunning being set on pipe-plate lining to be measured between bearing beam
Movable plate cooperation abuts；Test method includes that fixed frame and bearing beam are installed on bottom bracket, by measuring mechanism and sliding
Plate is installed on bearing beam etc..The technical solution can not carry out duct pieces of shield tunnel by external loads, stray electrical current and chlorine from
The test of Stiffness Deterioration caused by sub- joint effect, so that integrated testability data distortion, cannot simulate actual composing environment.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide under a kind of multifactor effect
Shield duct piece steel bar corrosion causes the test method of Stiffness Deterioration.
The purpose of the present invention can be achieved through the following technical solutions:
Shield duct piece steel bar corrosion causes the test method of Stiffness Deterioration under a kind of multifactor effect, comprising the following steps:
S1: the detection contact of strain acquirement instrument and displacement acquisition instrument 3 is set on shield duct piece, is obtained on shield duct piece
Real-time amount of deflection and internal force and situation of change；
S2: shield duct piece is held between pressure apparatus, is pressed from both sides by pressure apparatus to shield duct piece both ends loading level
Holding force increases chucking power and the load of shield duct piece is made to reach design load, and keeps load constant；
S3: Chloride Solution device is placed at the top of shield duct piece, and uses asphalt mixtures modified by epoxy resin in Chloride Solution bottom of device
Rouge and section of jurisdiction seal, and the solution containing chloride ion is poured into inside；
S4: access power device, inside one end access shield duct piece reinforcing bar of power device top electrode, the other end is put into
In solution containing chloride ion, carry out continuing energization；
S5: removing the power device on shield duct piece surface, armored concrete test block is taken out from shield duct piece inside, using CT
The section of scanner scanning armored concrete test block checks wherein reinforcing bar rusty scale form and rust crack situation；
S6: being pressurizeed by pressure apparatus 8, and the loading status so that shield duct piece reaches capacity is observed by crack observer
A situation arises in crack；
S7: amount of deflection, internal force and the variation in crack of the unattacked shield duct piece of comparative analysis and corrosion shield duct piece are led to
Cross the degenerate case of amount of deflection, internal force and the variation in crack reflection shield duct piece rigidity.
Further, the strain acquirement instrument is by type vibration wire reinforcing steel strain gauge and resistance-type concrete Strain Meter Set
At the strain of reinforcing bar and concrete can be measured respectively by type vibration wire reinforcing steel strain gauge and resistance-type concrete strain gauge, and count
Calculate the changing value for obtaining shield duct piece internal force.
Further, the Chloride Solution device is the container being made of transparent resin glass, is contained wherein being contained with
There is the solution of chloride ion, container bottom is open so that the solution containing chloride ion is contacted with shield duct piece, for simulating shield pipe
Corrosiveness of the piece reinforcing bar by underground water chloride ion.
Further, the crack observer in S6 utilizes the method automatic interpretation shield duct piece extrados crack of image recognition
Length and width, record rust crack shield duct piece ultimate load stage surface crack changing rule.
Further, the displacement acquisition instrument is made of post rod type displacement meter and data collector, the post rod type
Displacement meter can measure shield duct piece in the amount of deflection situation of change in different rust crack stages.
Further, the power device is by D.C. regulated power supply and the electrode group for being connected to D.C. regulated power supply both ends
At.
Further, inside described electrode one end access corrosion device solution, the other end accesses steel inside shield duct piece
Muscle, by adjusting size of current, corrosiveness of the analog shield duct piece reinforcing bar by stray electrical current.
Further, the pressure apparatus by reaction frame, jack and is held lotus device and is formed, and holds lotus device and is fixed on jack
Elongation end, reaction frame is fixed on ground and is butted on jack rear end, to hold by the horizontal extension of jack elongation end
Lotus device applies horizontal pressure force to shield duct piece connector both ends, to simulate scene of the shield duct piece by external loads.
Compared with existing test method, the invention has the following advantages that
One, the external influence factors that this test method considers more comprehensively, contain chloride ion, stray electrical current and external lotus
It carries, is more consistent with Practical Project environment, can accurately analyze the change mechanism that shield duct piece steel bar corrosion causes Stiffness Degradation；
Two, the object that this test method uses is true shield tunnel construction section of jurisdiction, the difference that structure type and scene use
Different small, test result can really reflect that corrosion causes the degenerate case of shield duct piece rigidity.
Detailed description of the invention
Fig. 1 is showing for the test method that shield duct piece steel bar corrosion causes Stiffness Deterioration under the multifactor effect in the present invention
It is intended to；
Fig. 2 is the measuring point value arrangement map of shield duct piece reinforcing bar and concrete in the present invention.
In figure: 1, crack observer, 2, crack observer, 3, displacement acquisition instrument, 4, type vibration wire reinforcing steel strain gauge, 5, resistance
Formula concrete strain gauge, 6, Chloride Solution device, 7, power device, 8, pressure apparatus.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
Shield duct piece steel bar corrosion causes the test method of Stiffness Deterioration under multifactor effect in the present embodiment, referring to Fig. 1,
It can be realized by following steps:
S1: the detection contact of strain acquirement instrument and displacement acquisition instrument 3 is set on shield duct piece, strain acquirement instrument be by
Type vibration wire reinforcing steel strain gauge 4 and resistance-type concrete strain gauge 5 form, and pass through type vibration wire reinforcing steel strain gauge 4 and resistance-type coagulation
Native strain gauge 5 can measure respectively the strain of reinforcing bar and concrete, and the changing value of shield duct piece internal force is calculated.Type vibration wire steel
Strain gauge measurement on demand direction is gently tied up on structure reinforcing bars when muscle strain gauge 4 is buried；When resistance-type concrete strain gauge 5 is buried
Concrete surface is fixed in strain gauge measurement on demand direction, referring to fig. 2.Displacement acquisition instrument 3 is by post rod type displacement meter and data
Collector composition, the post rod type displacement meter can measure shield duct piece in the amount of deflection situation of change in different rust crack stages.Mandril
Formula displacement meter is set to the underface in the middle part of shield duct piece, the vertical deflection after acquisition shield duct piece load, and by deformation quantity
Incoming data collector.
S2: shield duct piece is held between pressure apparatus 8, by pressure apparatus 8 to shield duct piece both ends loading level
Chucking power increases chucking power and the load of shield duct piece is made to reach design load, and keeps load constant；Pressure apparatus 8 is by anti-
Power frame, jack and hold lotus device composition, hold the elongation end that lotus device is fixed on jack, reaction frame is fixed on ground and is butted on thousand
Jin top rear end, to hold lotus device by the horizontal extension of jack elongation end and applies horizontal pressure force to shield duct piece connector both ends,
To simulate scene of the shield duct piece by external loads.
S3: Chloride Solution device 6 is placed at the top of shield duct piece, and uses asphalt mixtures modified by epoxy resin in Chloride Solution bottom of device
Rouge and section of jurisdiction seal, and the solution containing chloride ion is poured into inside, and Chloride Solution device 6 is the appearance being made of transparent resin glass
The bottom edge of device, shield duct piece is sealed by epoxy resin and shield duct piece top surface, i.e., constitutes and set at the top of shield duct piece
The bottom surface of Chloride Solution device 6, wherein being contained with the solution containing chloride ion, container bottom is open so that containing chloride ion
Solution contacted with shield duct piece, for simulating shield duct piece reinforcing bar by the corrosiveness of underground water chloride ion.
S4: access power device 7, inside one end access shield duct piece reinforcing bar of 7 top electrode of power device, the other end is put
Enter in the solution containing chloride ion, carries out continuing energization；Power device 7 is by D.C. regulated power supply and is connected to D.C. regulated power supply
The electrode at both ends forms.When it is implemented, the other end accesses inside shield duct piece inside electrode one end access corrosion device solution
Reinforcing bar, by adjusting size of current, corrosiveness of the analog shield duct piece reinforcing bar by stray electrical current.
S5: removing the power device 7 on shield duct piece surface, takes out armored concrete test block, reinforcing bar from shield duct piece inside
The size of concrete test block is 50mm × 50mm × 70mm, and the section of armored concrete test block is scanned using CT scanner 1, is checked
Wherein reinforcing bar rusty scale form and rust crack situation；
S6: being pressurizeed by pressure apparatus 8, and the loading status so that shield duct piece reaches capacity is observed by crack observer
A situation arises in crack；Crack observer 1 utilizes the length in the method automatic interpretation shield duct piece extrados crack of image recognition
And width, changing rule of the record rust crack shield duct piece in ultimate load stage surface crack.
S7: amount of deflection, internal force and the variation in crack of the unattacked shield duct piece of comparative analysis and corrosion shield duct piece are led to
Cross the degenerate case of amount of deflection, internal force and the variation in crack reflection shield duct piece rigidity.When comparing and analyzing, list can be carried out
One variable analysis carries out multi-variables analysis using orthogonal hair, studies the Chlorine in Solution ion concentration and PH to chloride ion respectively
Influence of the pressure value that value, electrical current size, two sides apply to amount of deflection, internal force and the length in crack and width.
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be of the invention
Within protection scope.
Claims (8)
1. shield duct piece steel bar corrosion causes the test method of Stiffness Deterioration under a kind of multifactor effect, which is characterized in that including
Following steps:
S1: the detection contact of strain acquirement instrument and displacement acquisition instrument (3) is set on shield duct piece, is obtained on shield duct piece
Real-time amount of deflection and internal force and situation of change；
S2: shield duct piece is held between pressure apparatus (8), by pressure apparatus (8) to shield duct piece both ends loading level
Chucking power increases chucking power and the load of shield duct piece is made to reach design load, and keeps load constant；
S3: placing Chloride Solution device (6) at the top of shield duct piece, and uses epoxy resin in Chloride Solution bottom of device
It is sealed with section of jurisdiction, the solution containing chloride ion is poured into inside；
S4: access power device (7), inside one end access shield duct piece reinforcing bar of power device (7) top electrode, the other end is put
Enter in the solution containing chloride ion, carries out continuing energization；
S5: removing power device (7), takes out armored concrete test block from shield duct piece inside, scans steel using CT scanner (1)
The section of reinforced concrete test block checks wherein reinforcing bar rusty scale form and rust crack situation；
S6: being pressurizeed by pressure apparatus (8), and the loading status so that shield duct piece reaches capacity is observed by crack observer (1)
A situation arises in crack；
S7: amount of deflection, internal force and the variation in crack of the unattacked shield duct piece of comparative analysis and corrosion shield duct piece, by scratching
The degenerate case of degree, internal force and the variation in crack reflection shield duct piece rigidity.
2. shield duct piece steel bar corrosion causes the test side of Stiffness Deterioration under a kind of multifactor effect according to claim 1
Method, which is characterized in that the strain acquirement instrument is by type vibration wire reinforcing steel strain gauge (4) and resistance-type concrete strain gauge (5)
Composition can measure answering for reinforcing bar and concrete by type vibration wire reinforcing steel strain gauge (4) and resistance-type concrete strain gauge (5) respectively
Become, and the changing value of shield duct piece internal force is calculated.
3. shield duct piece steel bar corrosion causes the test side of Stiffness Deterioration under a kind of multifactor effect according to claim 1
Method, which is characterized in that the Chloride Solution device (6) is the container being made of transparent resin glass, is contained wherein being contained with
There is the solution of chloride ion, container bottom is open so that the solution containing chloride ion is contacted with shield duct piece, for simulating shield pipe
Corrosiveness of the piece reinforcing bar by underground water chloride ion.
4. shield duct piece steel bar corrosion causes the test side of Stiffness Deterioration under a kind of multifactor effect according to claim 1
Method, which is characterized in that the crack observer (2) in S6 utilizes the method automatic interpretation shield duct piece extrados crack of image recognition
Length and width, record rust crack shield duct piece ultimate load stage surface crack changing rule.
5. shield duct piece steel bar corrosion causes the test side of Stiffness Deterioration under a kind of multifactor effect according to claim 1
Method, which is characterized in that the displacement acquisition instrument (3) is made of post rod type displacement meter and data collector, the post rod type
Displacement meter can measure shield duct piece in the amount of deflection situation of change in different rust crack stages.
6. shield duct piece steel bar corrosion causes the test side of Stiffness Deterioration under a kind of multifactor effect according to claim 1
Method, which is characterized in that the power device (7) is by D.C. regulated power supply and the electrode group for being connected to D.C. regulated power supply both ends
At.
7. shield duct piece steel bar corrosion causes the test side of Stiffness Deterioration under a kind of multifactor effect according to claim 6
Method, which is characterized in that inside electrode one end access corrosion device solution, the other end accesses reinforcing bar inside shield duct piece,
By adjusting size of current, corrosiveness of the analog shield duct piece reinforcing bar by stray electrical current.
8. shield duct piece steel bar corrosion causes the test side of Stiffness Deterioration under a kind of multifactor effect according to claim 1
Method, which is characterized in that the pressure apparatus (8) is by reaction frame, jack and holds lotus device and forms, and holds lotus device and is fixed on jack
Elongation end, reaction frame is fixed on ground and is butted on jack rear end, to hold by the horizontal extension of jack elongation end
Lotus device applies horizontal pressure force to shield duct piece connector both ends, to simulate scene of the shield duct piece by external loads.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910429341.3A CN110243677A (en) | 2019-05-22 | 2019-05-22 | Shield duct piece steel bar corrosion causes the test method of Stiffness Deterioration under a kind of multifactor effect |
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Cited By (2)
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| CN110842644A (en) * | 2019-11-09 | 2020-02-28 | 北京工业大学 | Method for monitoring contact stiffness degradation rate of machine tool moving part based on numerical control load information |
| CN114279947A (en) * | 2021-12-28 | 2022-04-05 | 中山大学 | Experimental device and method for researching shield tunnel segment performance degradation mechanism |
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| CN110842644A (en) * | 2019-11-09 | 2020-02-28 | 北京工业大学 | Method for monitoring contact stiffness degradation rate of machine tool moving part based on numerical control load information |
| CN110842644B (en) * | 2019-11-09 | 2021-02-02 | 北京工业大学 | Method for monitoring contact stiffness degradation rate of machine tool moving part based on numerical control load information |
| CN114279947A (en) * | 2021-12-28 | 2022-04-05 | 中山大学 | Experimental device and method for researching shield tunnel segment performance degradation mechanism |
| CN114279947B (en) * | 2021-12-28 | 2024-01-30 | 中山大学 | Experimental device and method for researching shield tunnel segment performance degradation mechanism |
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