CN113138229A - Method for monitoring subway tunnel ballast bed void diseases for long time by using distributed optical fibers - Google Patents
Method for monitoring subway tunnel ballast bed void diseases for long time by using distributed optical fibers Download PDFInfo
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- CN113138229A CN113138229A CN202010066969.4A CN202010066969A CN113138229A CN 113138229 A CN113138229 A CN 113138229A CN 202010066969 A CN202010066969 A CN 202010066969A CN 113138229 A CN113138229 A CN 113138229A
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- 239000011800 void material Substances 0.000 title claims abstract description 59
- 201000010099 disease Diseases 0.000 title claims abstract description 56
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 title claims abstract description 56
- 239000013307 optical fiber Substances 0.000 title claims abstract description 41
- 238000012544 monitoring process Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008859 change Effects 0.000 claims abstract description 14
- 238000000253 optical time-domain reflectometry Methods 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 2
- 239000004567 concrete Substances 0.000 description 6
- 230000029058 respiratory gaseous exchange Effects 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 241001669679 Eleotris Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Machines For Laying And Maintaining Railways (AREA)
Abstract
The invention provides a method for monitoring a subway tunnel ballast bed void disease by using a distributed optical fiber for a long time, which adopts the distributed optical fiber capable of sensing vibration, wherein the front end of the distributed optical fiber is connected with a vibration analyzer, the distributed optical fiber is arranged along the length direction of the ballast bed of a subway tunnel, and the distributed optical fiber is attached to the surface or the side surface of the ballast bed; when the subway vehicle passes, the analyzer measures the vibration signal of the track bed at a certain interval; repeating the measurement at certain time intervals; and comparing the vibration signals of the same monitoring points at different times, judging whether the track bed has a void disease or has a tendency of void at a certain position, determining the time of the void disease, and monitoring the change condition of the void disease. According to the invention, whether the track bed has the void diseases is judged by monitoring the vibration signals of the track bed for a long time, the occurrence time of the void diseases is determined, the change condition of the void diseases is monitored, and the problem of long-term monitoring of the void diseases of the subway tunnel track bed is effectively solved.
Description
Technical Field
The invention relates to a method for monitoring a subway tunnel ballast bed void disease for a long time by using a distributed optical fiber, which is suitable for monitoring the subway tunnel void disease for a long time, finding the void disease of the subway tunnel ballast bed in time, determining the occurrence time of the void disease and monitoring the change condition of the void disease.
Background
The integral track bed of the subway tunnel is an important component of a civil engineering structure of the subway, generally adopts plain concrete or reinforced concrete, and the construction method is to cast the concrete and the tunnel structure together after roughening the bottom of the structure. During the operation of the subway tunnel, because the subway tunnel subsides, warp or under the long-term operation effect of train, the faying face of whole railway roadbed and tunnel structure is very easily peeled off, is come to the air, forms the gap. Under the action of the running dynamic load of a subway train, concrete on two sides of a gap is repeatedly ground due to continuous vibration of a track bed, the gap breathing phenomenon occurs along with the vibration of the track bed in underground water permeating into the gap, rapid water flow formed by the gap breathing repeatedly and subcontacts track bed concrete and tunnel structure concrete on two sides of the gap, particularly strong subcontact corrosion is caused to track bed concrete with relatively weak strength, mud pumping and grout turning are generated, mud and fine sand continuously overflow from the gap, the gap is gradually enlarged, the subcontact corrosion of the breathing is further intensified, and finally the whole track bed is void. The track bed void disease not only shortens the service life of the tunnel structure, but also brings adverse effects to the normal operation of the subway, and the serious track bed void disease can even endanger the safe operation of the subway. At present, a long-term effective monitoring means is lacked for the subway tunnel ballast bed void diseases, the occurrence of the ballast bed void diseases cannot be found in time, the void diseases cannot be monitored, and certain potential safety hazards are brought to subway operation.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for rapidly detecting the position of the railway bed void disease of the subway tunnel by using the distributed optical fiber is provided, so that the problem of long-term monitoring of the railway bed void disease in the operation process of the subway tunnel is solved. Therefore, the invention adopts the following technical scheme:
a method for monitoring the subway tunnel ballast bed void diseases for a long time by using distributed optical fibers is characterized in that the distributed optical fibers capable of sensing vibration are adopted, the front ends of the distributed optical fibers are connected with corresponding analyzers, the analyzers are vibration analyzers, and the method comprises the following steps:
(1) arranging distributed optical fibers along the length direction of a track bed of the subway tunnel, and attaching the distributed optical fibers to the surface or the side surface of the track bed;
(2) when the subway vehicle passes, the analyzer measures the vibration signal of the track bed at a certain interval;
(3) repeating the step (2) at certain time intervals;
the method further comprises the step of analyzing:
the amplitude, frequency, energy and amplitude-frequency characteristic analysis is carried out on the vibration signals of the distributed optical fibers at each monitoring point of the track bed collected each time, the vibration signals of the same monitoring point at different times are compared, whether the track bed has a void disease or a tendency of void at a certain position is judged, the time of the void disease is determined, and the change condition of the void disease is monitored.
When the distributed optical fiber is used for measuring the vibration signal, the measurement must be carried out when the subway vehicle passes through, and if necessary, the monitoring of the steps (1) to (3) can be carried out simultaneously on two sides of the track bed.
According to the track bed structure of the subway tunnel, rails, sleepers, track beds and the tunnel are connected into a whole, when subway vehicles pass, vibration responses under the excitation of wheels are basically the same, and vibration amplitude, main frequency and amplitude-frequency characteristics of all positions of the track bed are basically the same. When a track bed at a certain position is empty, the track bed is separated from a tunnel, the vibration response under the excitation of wheels when subway vehicles pass is different from that of the part without the empty track, the vibration amplitude, the main frequency, the energy and the amplitude-frequency characteristic of the track bed are obviously changed, the general amplitude is increased, the main frequency is reduced, the energy is enhanced, and the amplitude-frequency characteristic curve moves towards the low-frequency direction (if a bronze gong is broken, the knocking sound is changed); and the larger the change, the more serious the cavitation disease. Therefore, by monitoring the vibration signal of the track bed for a long time and analyzing the amplitude, the main frequency, the energy, the amplitude-frequency characteristic and the change of the vibration signal of the track bed, whether the track bed has the void diseases or not can be judged, the occurrence time of the void diseases is determined, and the change condition of the void diseases is monitored.
The method adopts the distributed optical fiber to sense the track bed vibration signal, judges whether the track bed has the void diseases or not according to the amplitude, the main frequency, the amplitude-frequency characteristics and the change of the track bed vibration signal, determines the time of the void diseases, and monitors the change condition of the void diseases. When the distributed optical fibers are arranged, the distributed optical fibers should be adhered to the surface or the side surface of the ballast bed by glue or adhesive tape, and the length of the optical fibers can be hundreds of meters or even kilometers. Then, the analyzer measures the track bed vibration signal at a certain pitch when the vehicle passes, and the sampling pitch may be set to 0.5m, 1m, or the like. Whether the track bed has the void diseases or not is judged through long-term monitoring, the time for the void diseases is determined, the change conditions of the void diseases are monitored, and generally the void diseases are monitored at least once every week and are monitored for a long time.
The method analyzes the amplitude, the main frequency, the energy, the amplitude-frequency characteristic and the change of the track bed vibration signal by monitoring the track bed vibration signal for a long time, judges whether the track bed has the void diseases, determines the occurrence time of the void diseases, monitors the change condition of the void diseases, effectively solves the problem of long-term monitoring of the void diseases of the subway tunnel track bed, finds the void diseases of the track bed in time and ensures the safe operation of the subway vehicle. The method has the advantages of high monitoring efficiency (hundreds of meters to kilometers can be detected at one time), high disease positioning precision (up to +/-1 m), no influence on the safe operation of the subway vehicle due to the fact that the distributed optical fibers are pasted along the side face of the track bed, and no inconvenience for the operation and maintenance of the subway.
Drawings
FIG. 1 is a schematic diagram of a method for monitoring the subway tunnel ballast bed void diseases by using distributed optical fibers for a long time.
Detailed Description
Reference is made to the accompanying drawings. The invention discloses a method for monitoring a subway tunnel ballast bed void disease by using a distributed optical fiber for a long time, which adopts a distributed optical fiber 1 capable of sensing vibration, wherein the front end of the distributed optical fiber 1 is connected with a vibration analyzer 2, and the method comprises the following steps:
(1) along the length direction of the track bed 100, the distributed optical fibers 1 are arranged on the track bed 100 of the subway tunnel, the distributed optical fibers 1 are adhered to the surface or the side face of one side of the track bed by glue or adhesive tapes, and the length of the distributed optical fibers can be arranged from hundreds of meters to kilometers according to needs.
(2) The analyzer 2 sets a sampling interval (e.g., 0.5m) at the highest resolution, and measures the vibration of the track bed when the subway vehicle passes through;
(3) repeating the step (2) at certain time intervals;
the amplitude, frequency, energy and amplitude-frequency characteristic analysis is carried out on the vibration signals of the distributed optical fibers at each monitoring point of the track bed collected each time, the vibration signals of the same monitoring point at different times are compared, whether the track bed has a void disease or a tendency of void at a certain position is judged, the time of the void disease is determined, and the change condition of the void disease is monitored.
The time interval control is monitored at least once per week and for a long period of time. If necessary, the monitoring can be carried out simultaneously on both sides of the track bed.
In fig. 1, reference numeral 101 denotes a rail, and reference numeral 102 denotes a sleeper.
The above description is only an embodiment of the present invention, and the technical features of the present invention are not limited thereto, and any changes or modifications within the field of the present invention by those skilled in the relevant art are covered by the protection scope of the present invention.
Claims (5)
1. A method for monitoring the subway tunnel ballast bed void diseases for a long time by using distributed optical fibers is characterized in that the distributed optical fibers capable of sensing vibration are adopted, the front ends of the distributed optical fibers are connected with corresponding analyzers, the analyzers are vibration analyzers, and the method comprises the following steps:
(1) arranging distributed optical fibers along the length direction of a track bed of the subway tunnel, and attaching the distributed optical fibers to the surface or the side surface of the track bed;
(2) when the subway vehicle passes, the analyzer measures the vibration signal of the track bed at a certain interval;
(3) repeating the step (2) at certain time intervals;
the method further comprises the step of analyzing:
the amplitude, frequency, energy and amplitude-frequency characteristic analysis is carried out on the vibration signals of the distributed optical fibers at each monitoring point of the track bed collected each time, the vibration signals of the same monitoring point at different times are compared, whether the track bed has a void disease or a tendency of void at a certain position is judged, the time of the void disease is determined, and the change condition of the void disease is monitored.
2. The method for monitoring the subway tunnel ballast bed void disease by using the distributed optical fiber for a long time as claimed in claim 1, wherein said distributed optical fiber is a vibration sensing optical fiber.
3. The method for monitoring the subway tunnel ballast bed void diseases by the distributed optical fiber for a long time as claimed in claim 1, wherein said analyzer measures the vibration of the ballast bed at a certain interval by using an optical time domain reflectometry technique.
4. The method for monitoring the subway tunnel ballast bed void disease by the distributed optical fiber for a long time as claimed in claim 1, wherein said step of monitoring is performed while the subway vehicles are in transit, at least once per week and for a long time.
5. The method for monitoring the subway tunnel ballast bed void diseases for a long time by using the distributed optical fiber as claimed in claim 1, characterized in that the monitoring of the steps (1) to (3) is simultaneously carried out on both sides of the ballast bed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010066969.4A CN113138229A (en) | 2020-01-20 | 2020-01-20 | Method for monitoring subway tunnel ballast bed void diseases for long time by using distributed optical fibers |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010066969.4A CN113138229A (en) | 2020-01-20 | 2020-01-20 | Method for monitoring subway tunnel ballast bed void diseases for long time by using distributed optical fibers |
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| CN113138229A true CN113138229A (en) | 2021-07-20 |
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| CN202010066969.4A Pending CN113138229A (en) | 2020-01-20 | 2020-01-20 | Method for monitoring subway tunnel ballast bed void diseases for long time by using distributed optical fibers |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105303777A (en) * | 2015-11-13 | 2016-02-03 | 中铁二院工程集团有限责任公司 | Tunnel lining structure spalling and collapsing real-time monitoring and alarming system |
| CN108226288A (en) * | 2017-12-05 | 2018-06-29 | 中国建筑股份有限公司 | A kind of subway tunnel railway roadbed comes to nothing quantity monitoring method |
| CN209904774U (en) * | 2019-01-28 | 2020-01-07 | 深圳大学 | Subway track monitoring system with long distance, high precision and switching |
-
2020
- 2020-01-20 CN CN202010066969.4A patent/CN113138229A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105303777A (en) * | 2015-11-13 | 2016-02-03 | 中铁二院工程集团有限责任公司 | Tunnel lining structure spalling and collapsing real-time monitoring and alarming system |
| CN108226288A (en) * | 2017-12-05 | 2018-06-29 | 中国建筑股份有限公司 | A kind of subway tunnel railway roadbed comes to nothing quantity monitoring method |
| CN209904774U (en) * | 2019-01-28 | 2020-01-07 | 深圳大学 | Subway track monitoring system with long distance, high precision and switching |
Non-Patent Citations (1)
| Title |
|---|
| 刘梦龙: "分布式光纤传感技术在地铁隧道振动监测中的应用", 《交通科技》 * |
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