CN117781884A - System and method for comprehensively detecting crack information of long-distance water delivery tunnel - Google Patents
System and method for comprehensively detecting crack information of long-distance water delivery tunnel Download PDFInfo
- Publication number
- CN117781884A CN117781884A CN202311649458.5A CN202311649458A CN117781884A CN 117781884 A CN117781884 A CN 117781884A CN 202311649458 A CN202311649458 A CN 202311649458A CN 117781884 A CN117781884 A CN 117781884A
- Authority
- CN
- China
- Prior art keywords
- crack
- optical fiber
- tunnel
- optical
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims description 24
- 239000013307 optical fiber Substances 0.000 claims abstract description 164
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims description 60
- 239000011521 glass Substances 0.000 claims description 32
- 230000008447 perception Effects 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 9
- 230000008595 infiltration Effects 0.000 claims description 8
- 238000001764 infiltration Methods 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims 2
- 238000004458 analytical method Methods 0.000 abstract description 4
- 239000013308 plastic optical fiber Substances 0.000 description 22
- 230000008569 process Effects 0.000 description 8
- 238000009529 body temperature measurement Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 7
- 239000000835 fiber Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
The comprehensive detection method is used for determining a semi-empirical formula between the opening degree of a crack and the light loss rate of the crack under different intersection angles of the optical fiber and the crack by the crack light loss rate determining system; arranging two optical fibers on the inner wall of the water delivery tunnel in a spiral manner at a certain intersection angle, and realizing detection analysis on the position, width and trend of the crack through an angle relation and a semi-empirical formula when the crack passes through the two optical fibers; when the opening of the crack is larger, after the inner wall of the water delivery tunnel is permeated, the temperature measuring optical fiber temperature drop part is positioned through the tunnel crack permeation sensing arrangement system, so that the comprehensive positioning sensing of the large crack is realized.
Description
Technical Field
The invention belongs to the field of hydraulic engineering monitoring and detecting systems, and particularly relates to a system and a method for comprehensively detecting crack information of a long-distance water delivery tunnel.
Background
The long-distance water delivery tunnel is a common hydraulic building in transregional water diversion, and the early stage of tunnel structure degradation is often accompanied with crack inoculation and development. The comprehensive information (position, trend and width) of the crack can be mastered early, so that major accidents can be effectively avoided. But the water delivery tunnel is deeply buried underground, long and narrow in structure and is in a wading blind operation state for a long time, and the randomness of the occurrence position, the trend and the number of cracks is added, so that the accurate positioning and capturing are difficult to realize by the existing monitoring and detecting technology. At present, various point type monitoring instruments are buried in a representative section of a tunnel, stress, seepage, deformation and other distribution conditions are monitored, but blind areas are formed between monitoring sections, the omission space is large, and comprehensive safety feedback of the water delivery tunnel is inaccurate. The traditional manual inspection method needs to empty water in the tunnel and then enter the tunnel for internal inspection, and has the problems of large time and economic cost, low precision, high personnel risk and the like. And the emerging technologies such as a geological radar method, an acoustic emission method and a robot three-dimensional scanning method are affected by water and complex environments, and the precision and the effect of crack disease detection are not high.
Disclosure of Invention
In order to solve or partially solve the problems existing in related systems, the application provides a system and a method for comprehensively detecting the crack information of a long-distance water delivery tunnel.
The first aspect of the application provides a long-distance water-conveying tunnel crack information comprehensive detection system, which comprises a crack light loss calibration system, a tunnel crack comprehensive sensing arrangement system and a tunnel crack water seepage sensing arrangement system;
the crack optical loss calibration system comprises a glass plate, an optical fiber, a light source emitter and an optical time domain reflectometer, wherein the glass plate is used for simulating a crack surface, the crack opening of the crack surface is delta L, the optical fiber is connected with the glass plate, and the light source emitter and the optical time domain reflectometer are used for measuring the optical loss value of the optical fiber at the crack surface;
the tunnel crack comprehensive perception arrangement system comprises an optical fiber, a light source emitter and an optical time domain reflectometer, wherein the optical fiber is spirally embedded and installed on the inner wall of the water delivery tunnel, and the light source emitter and the optical time domain reflectometer are used for measuring the optical loss value of the optical fiber in the water delivery tunnel crack and positioning the crack position;
the tunnel crack water seepage perception arrangement system comprises a temperature measuring optical fiber, a water seepage collecting pipe, spherical rubber water stopping and a DTS temperature measuring system, wherein the water seepage collecting pipe is arranged in the wall of the water delivery tunnel, the temperature measuring optical fiber is arranged in the water seepage collecting pipe, the spherical rubber water stopping is uniformly arranged on the temperature measuring optical fiber, and the temperature measuring optical fiber is connected with the DTS temperature measuring system.
In some embodiments of the first aspect, optionally,
crack light loss rateThe fixed system comprises a single optical fiber system and a double optical fiber system; the single optical fiber system is provided with a single optical fiber which is connected with the glass plate, and the angle between the optical fiber and the crack surface is alpha after the glass plate is moved; the double-branch optical fiber system is provided with double-branch optical fibers connected with a glass plate, and the intersection angle of the first optical fiber and the second optical fiber is alpha 0 The intersection angle of the first optical fiber and the center line of the crack surface is alpha 2 The intersection angle of the second optical fiber and the center line of the crack surface is alpha 1 。
In some embodiments of the first aspect, optionally,
the tunnel crack comprehensive sensing arrangement system comprises a third optical fiber and a fourth optical fiber, wherein the extension intersection angle of the third optical fiber and the fourth optical fiber is alpha 0 The intersection point of the third optical fiber and the crack is A1, and the intersection angle is alpha 1 The intersection point of the fourth optical fiber and the crack is A2, and the intersection angle is alpha 2 And when the crack intersects with the third optical fiber and the fourth optical fiber, the relation shown in the formula (1) is satisfied:
α 0 ＝α 1 -α 2 (1)。
the second aspect of the application provides a comprehensive detection method for long-distance water conveyance tunnel crack information, which is based on the comprehensive detection system for long-distance water conveyance tunnel crack information provided in the first aspect, and comprises the following steps:
measuring opening, position and direction information of the crack based on the crack light loss calibration system and the tunnel crack comprehensive sensing arrangement system;
and measuring the crack water seepage position based on the tunnel crack water seepage perception arrangement system.
Optionally, in some embodiments of the second aspect,
the method for measuring the opening, position and direction information of the crack based on the crack light loss calibration system and the tunnel crack comprehensive sensing arrangement system comprises the following steps:
a semi-empirical formula (2) of the optical loss value and the crack opening degree is obtained based on the crack optical loss calibration system:
in the formula (2), delta is the bending loss rate of the optical fiber, delta L is the opening degree of the crack, and K 1 ＝6.74，K 2 ＝1.60，K 3 ＝2.28，K 4 ＝0.2048；
Based on the formula (2) and the tunnel crack comprehensive perception arrangement system, a simultaneous calculation formula (3) for calculating the crack opening is obtained:
in the formula (3), delta 1 、δ 2 Bending loss rate of the third optical fiber and the fourth optical fiber, alpha 1 Is the intersection angle alpha of the third optical fiber and the crack 2 The intersection angle of the fourth optical fiber and the crack is delta L, and the opening of the crack is delta L;
based on formula (1), formula (3) and the extension intersection angle alpha of the optical fiber No. three and the optical fiber No. four 0 Calculating to obtain the opening degree of the crack;
the optical time domain reflectometer is used for positioning and obtaining the position and direction information of the crack based on the optical loss at the A1 and the A2.
Optionally, in some embodiments of the second aspect,
measuring crack infiltration position based on tunnel crack infiltration perception arrangement system includes:
the width of the crack is wide enough to cause the inner wall of the tunnel to leak water, and the leaking water permeates into the water seepage collecting pipe to enable the spherical rubber to stop water and expand when meeting water;
the spherical rubber water stop forms a partition to enable water leakage to be collected in the water seepage collecting pipe;
and detecting the low temperature position of the temperature measuring optical fiber through a DTS temperature measuring system to obtain the crack water seepage position.
The system scheme provided by the application can comprise the following beneficial effects:
the invention provides a comprehensive detection system and method for crack information of a long-distance water-conveying tunnel, which comprises the steps of firstly, adopting a crack optical loss calibration system to determine a semi-empirical formula between the opening degree of a crack and the optical loss rate of the crack under different intersection angles of an optical fiber and the crack; arranging two optical fibers on the inner wall of the water delivery tunnel in a spiral manner at a certain intersection angle, and realizing detection analysis on the position, width and trend of the crack through an angle relation and a semi-empirical formula when the crack passes through the two optical fibers; when the opening of the crack is larger, after the inner wall of the water delivery tunnel is permeated, the temperature measuring optical fiber temperature drop part is positioned through the tunnel crack permeation sensing arrangement system, so that the comprehensive positioning sensing of the large crack is realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.
FIG. 1 is a schematic diagram of a single fiber system of a split optical loss rating system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a two-fiber system of a split optical loss rating system according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a tunnel crack comprehensive sensing arrangement system and a tunnel crack water seepage sensing arrangement system shown in an embodiment of the application;
fig. 4 is a schematic cross-sectional view of a tunnel crack water seepage perception arrangement system shown in an embodiment of the application.
Reference numerals:
in the figure, glass plates-1, 2, plastic optical fibers-3, 7, 8, a crack surface-4, a light source luminometer-5, an optical time domain reflectometer-6, coiled optical fibers-9, 10, a crack-11, a water delivery tunnel-12, temperature measuring optical fibers-13, 17, 19, 21, water seepage collecting pipes-14, 18, 20, 22, a spherical rubber water stop-15 and a DST temperature measuring system-16.
Detailed Description
Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, a first message may also be referred to as a second message, and similarly, a second message may also be referred to as a first message, without departing from the scope of the present application. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The system scheme of the embodiment of the present application is described in detail below with reference to the accompanying drawings.
Embodiment one:
a long-distance water conveyance tunnel crack information comprehensive detection system comprises:
the system comprises a crack light loss calibration system, a tunnel crack comprehensive sensing arrangement system and a tunnel crack water seepage sensing arrangement system.
The crack optical loss calibration system comprises a single optical fiber system and a double optical fiber system, wherein the first optical fiber is arranged in the single optical fiber system, the second optical fiber and the third optical fiber are arranged in the double optical fiber system, in the embodiment, the first optical fiber is a plastic optical fiber 3, the second optical fiber is a plastic optical fiber 7, and the third optical fiber is a plastic optical fiber 8.
The single-fiber system shown in fig. 1 comprises a glass plate 1, a glass plate 2, a plastic optical fiber 3, a light source emitter 5 and an optical time domain reflectometer 6. A distance DeltaL is formed between the glass plate 1 and the glass plate 2, wherein the glass plate 1 is fixed, and the glass plate 2 can move normally to simulate the opening of the crack surface 4; the plastic optical fiber 3 is glued on the glass plate 1 and the glass plate 2 by adopting epoxy resin, and forms a certain angle alpha with the crack surface 4; the light source emitter 5 can emit light with different wavelengths and powers; the optical time domain reflectometer 6 can record the optical loss value of the plastic optical fiber 3 at the position of the crack surface 4.
The optical time domain reflectometer is an instrument for knowing a plurality of performances such as uniformity, defects, fracture, joint coupling and the like of an optical fiber through analysis of a measurement curve. The optical fiber attenuation measuring device is manufactured according to the back scattering and Fresnel reverse principle of light, utilizes back scattering light generated when the light propagates in the optical fiber to acquire attenuation information, and can be used for measuring optical fiber attenuation, joint loss, optical fiber fault point positioning, knowing the loss distribution condition of the optical fiber along the length and the like.
The double-branch optical fiber system shown in fig. 2 comprises a glass plate 1, a glass plate 2, a plastic optical fiber 7, a plastic optical fiber 8, a light source emitter 5 and an optical time domain reflectometer 6, wherein the glass plate 1 is fixed, the glass plate 2 is horizontally moved, and the cracking process of a crack surface 4 is simulated. The plastic optical fiber 7 and the plastic optical fiber 8 are adhered and fixed on the glass plate 1 and the glass plate 2 by using epoxy resin adhesive, and the intersection angle of the two optical fibers is alpha 0 The intersection angle of the central line of the plastic optical fiber 7 and the crack surface 4 is alpha 2 The intersection angle of the central line of the plastic optical fiber 8 and the crack surface 4 is alpha 1 ，α 0 、α 1 、α 2 There is a relationship as shown in formula (1):
α 0 ＝α 1 -α 2 (1)。
the light source emitter 5 can emit light with different wavelengths and powers; the optical time domain reflectometer 6 can record the optical loss values of the plastic optical fibers 7 and 8 at the position of the crack surface 4.
The tunnel crack comprehensive sensing arrangement system is internally provided with a second optical fiber, the second optical fiber comprises a fourth optical fiber and a fifth optical fiber, an extension intersection angle exists between the fourth optical fiber and the fifth optical fiber, in the embodiment, the fourth optical fiber is a coiled optical fiber 9, and the fifth optical fiber is a coiled optical fiber 10.
The tunnel crack comprehensive sensing arrangement system comprises a coiled optical fiber 9, a coiled optical fiber 10, a light source emitter 5 and an optical time domain reflectometer 6. The coiled optical fibers 9 and 10 are spirally arranged plastic optical fibers, the grooves are embedded in the inner wall of the water delivery tunnel 12, and an included angle alpha is formed by arranging the plastic optical fibers 9 and 10 on a plane for facilitating angle conversion 0 . The intersection point of the coiled optical fiber 9 and the crack 11 of the water delivery tunnel 12 is A1, and the intersection angle is alpha 1 The intersection point of the coiled optical fiber 10 and the crack 11 of the water delivery tunnel 12 is A2, and the intersection angle is alpha 2 As shown in fig. 3. The optical time domain reflectometer 6 is used for recording the optical loss values of the coiled optical fiber 9 and the coiled optical fiber 10 at the position of the crack 11. The light source emitter 5 and the optical time domain reflectometer 6 are respectively utilized to measure the optical loss at the two ends of the coiled optical fiber 9 and the coiled optical fiber 10 during measurement, so that the influence of overlarge cracks on the sensing distance of the plastic optical fiber is avoided.
As shown in fig. 3 and 4, the tunnel crack water seepage sensing arrangement system comprises a water seepage collecting pipe, a temperature measuring optical fiber and a spherical rubber water stop 15. The water seepage collecting pipe is fully distributed with small holes and poured in the hole wall of the water delivery tunnel 12, is symmetrically arranged at the four highest point positions of the upper, lower, left and right sides of the tunnel wall, is provided with the water seepage collecting pipe 14 along the top of the tunnel, is provided with the water seepage collecting pipe 20 along the left end of the tunnel, is provided with the water seepage collecting pipe 22 along the right end of the tunnel, and is provided with the water seepage collecting pipe 18 along the bottom of the tunnel.
A temperature measuring optical fiber is arranged in the water seepage collecting pipe, a temperature measuring optical fiber 13 is arranged in the water seepage collecting pipe 14, a temperature measuring optical fiber 19 is arranged in the water seepage collecting pipe 20, a temperature measuring optical fiber 21 is arranged in the water seepage collecting pipe 22, and a temperature measuring optical fiber 17 is arranged in the water seepage collecting pipe 18. The four temperature measuring optical fibers are provided with spherical rubber water stops 15 which are uniform every 10 m. The spherical rubber water stop 15 expands when meeting water, so that water seepage in the pipe is converged near the spherical rubber water stop 15, the DTS temperature measurement system 16 can position the along-path temperature change of the temperature measurement optical fiber, and the temperature of the optical fiber can be reduced when meeting water, so that the approximate water seepage position is determined.
Among them, DTS (Distributed Temperature Sensing), distributed fiber temperature measurement system (DTS) is also called fiber temperature measurement, and temperature monitoring is realized according to the Optical Time Domain Reflection (OTDR) principle and the sensitivity of Raman (Raman) scattering effect to temperature.
Embodiment two:
a long-distance water conveyance tunnel crack information comprehensive detection method based on the long-distance water conveyance tunnel crack information comprehensive detection system shown in the first embodiment comprises the following steps:
measuring opening, position and direction information of the crack based on the crack light loss calibration system and the tunnel crack comprehensive sensing arrangement system;
and measuring the crack water seepage position based on the tunnel crack water seepage perception arrangement system.
Before the calibration test, the light source emitter 5 is adjusted to select the wavelength of light to be 1400nm, the plastic optical fiber 3 is bonded on the glass plate 1 and the glass plate 2 by using epoxy resin glue, and is intersected with the crack surface at a certain angle alpha (alpha=20 DEG, 30 DEG, 40 DEG, 50 DEG and 60 DEG), the glass plate 2 is moved normally, the crack surface opening is simulated, the relation between the crack opening and the optical loss is measured by the optical time domain reflectometer 6, and the test results of the optical loss value, the crack opening and the crack intersection angle are shown in table 1.
TABLE 1 optical loss value (dB) at an incident wavelength of 1400nm
The distributed optical fiber crack sensing principle can be used for knowing that the formula of the oblique crossing sensing optical loss is an exponential function. From the tensile fracture simulation test, it can be seen that: the optical loss value is related to the crack opening delta L and the included angle alpha between the crack and the optical fiber, and according to the test data in the table 1, a semi-empirical formula (2) is determined by using a nonlinear least squares fitting function rate:
in the formula (2), delta is the bending loss rate of the optical fiber, delta L is the opening degree of the crack, and K 1 ～K 4 Respectively K 1 ＝6.74，K 2 ＝1.60，K 3 ＝2.28，K 4 ＝0.2048。
On the basis of the above test, plastic optical fibers 7 and 8 were glued to the glass plates 1 and 2, and the intersection angle α of the two optical fibers was measured 0 Angle α of intersection of plastic optical fiber 7 and centerline of fracture surface 4 =20° 2 Angle α of intersection of plastic optical fiber 8 and centerline of fracture surface 4 =45° 1 =65°, satisfying formula (1): alpha 0 ＝α 1 -α 2 . The glass plate 2 is horizontally moved, the cracking process of a crack surface 4 is simulated, on the basis of a formula (2), the optical loss values of the plastic optical fiber 7 and the plastic optical fiber 8 under different crack opening degrees are recorded by the light source emitter 5 and the light time domain reflectometer 6 respectively, and a simultaneous formula is obtained to obtain a simultaneous calculation formula (3):
delta in the formula 1 ，δ 2 To a known amount, deltaL, alpha 1 ，α 2 Are all unknown but because of the presence of alpha 0 =20°, and α 0 ＝α 1 -α 2 Three unknowns Δl, α in the above formula 1 ，α 2 Can be obtained by the formula (2). The final test data and calculated data are compared to table 2.
Table 2 two optical fiber crack comprehensive information positioning test
According to the calculation results in table 2, it can be seen that the double-branch intersection angle optical fiber arrangement has good monitoring capability on the development direction and development width of the crack, wherein the maximum error of the calculated value and the actual angle of the two included angles is 2.95 degrees, the maximum error of the calculated value and the actual measured value of the opening degree of the crack is 0.25mm, and the precision can meet the actual requirements of engineering.
And according to the test result, arranging the tunnel crack comprehensive sensing arrangement system in the actual tunnel engineering application. The coiled optical fiber 9, the coiled optical fiber 10 are arranged to form an angle alpha 0 The intersection point of the coiled optical fiber 9 and the crack 11 of the water delivery tunnel 12 is A1, and the intersection angle is alpha 1 The intersection point of the coiled optical fiber 10 and the crack 11 of the water delivery tunnel 12 is A2, and the intersection angle is alpha 2 。
When the crack intersects the coiled optical fiber 9 and the coiled optical fiber 10, the angle relation between the two meets the relation shown in the formula (1), a light source emitter 5 is adopted to emit a light source to the coiled optical fiber 9, the optical time domain reflectometer 6 is used for measuring the optical loss value, the process is repeated to operate the coiled optical fiber 10 once again, and the calculation process is repeated to finally obtain the opening value of the crack 11.
In the process of measuring the optical loss value, the optical time domain reflectometer 6 is used for positioning the position of the crack 11, and because the A1 and the A2 are the intersection points of the optical fiber and the crack, the optical loss can be generated at the position of the crack, the A1 and the A2 can be positioned through the loss, and further the information of the position and the direction of the crack 11 is obtained.
Measuring crack infiltration position based on tunnel crack infiltration perception arrangement system includes:
the width of the crack 11 is wide enough to cause the inner wall of the tunnel to leak water, and the leaking water permeates into the seepage collecting pipe 14 to expand the spherical rubber water stop 15 when meeting water;
the spherical rubber water stop 15 forms a partition to collect water leakage in the water seepage collecting pipe 14;
and detecting the low temperature position of the temperature measuring optical fiber by the DTS temperature measuring system 16 to obtain the water seepage position of the crack 11.
The water seepage collecting pipes 14 are poured into the tunnel wall of the water delivery tunnel 12 and are symmetrically arranged at the upper, lower, left and right positions of the tunnel wall; the temperature measuring optical fiber 13 is arranged in the water seepage collecting pipe 14; the spherical rubber water stop 15 is uniformly arranged on the temperature measuring optical fiber 13 every 10m, and expands when meeting water, so that water seepage in the pipe is converged near the spherical rubber water stop 15; the DTS temperature measurement system 16 can position the along-path temperature change of the temperature measurement optical fiber 13, when the width of the crack 11 is wide enough to cause water leakage on the inner wall of the tunnel, the crack can be converged in the water seepage collecting pipe 14, the DTS temperature measurement system 16 is started, at the moment, the low-temperature part of the optical fiber is the approximate position of the crack-induced leakage, the process is repeated for three times, whether the leakage of the serious crack exists at other parts can be detected, and the comprehensive detection of the crack information and the crack water seepage position is realized.
Through the operation content, the opening information, the position and the direction information of the tunnel cracks and the crack water seepage position information can be obtained, so that the comprehensive monitoring of the long-distance water delivery tunnel crack information is realized.
The invention provides a comprehensive detection system and method for crack information of a long-distance water-conveying tunnel, which comprises the steps of firstly, adopting a crack optical loss calibration system to determine a semi-empirical formula between the opening degree of a crack and the optical loss rate of the crack under different intersection angles of an optical fiber and the crack; arranging two optical fibers on the inner wall of the water delivery tunnel in a spiral manner at a certain intersection angle, and realizing detection analysis on the position, width and trend of the crack through an angle relation and a semi-empirical formula when the crack passes through the two optical fibers; when the opening of the crack is larger, after the inner wall of the water delivery tunnel is permeated, the temperature measuring optical fiber temperature drop part is positioned through the tunnel crack permeation sensing arrangement system, so that the comprehensive positioning sensing of the large crack is realized.
Finally, it is further noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms include, comprise, or any other variation is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The embodiments of the present application have been described above, the foregoing description is exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art of the system without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of systems in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (6)
1. The utility model provides a long distance water delivery tunnel crack information comprehensive detection system which characterized in that includes:
the system comprises a crack light loss calibration system, a tunnel crack comprehensive sensing arrangement system and a tunnel crack water seepage sensing arrangement system;
the crack optical loss calibration system comprises a glass plate, a first optical fiber, a light source emitter and an optical time domain reflectometer, wherein the glass plate is used for simulating a crack surface, the crack opening of the crack surface is delta L, the optical fiber is connected with the glass plate, and the light source emitter and the optical time domain reflectometer are used for measuring the optical loss value of the optical fiber on the crack surface;
the tunnel crack comprehensive perception arrangement system comprises a second optical fiber, a light source emitter and an optical time domain reflectometer, wherein the optical fiber is arranged on the inner wall of the water delivery tunnel, and the light source emitter and the optical time domain reflectometer are used for measuring the optical loss value of a crack of the optical fiber in the water delivery tunnel and positioning the position of the crack;
the tunnel crack infiltration perception arrangement system comprises a temperature measuring optical fiber, a infiltration collecting pipe, spherical rubber water stopping and a DTS temperature measuring system, wherein the infiltration collecting pipe is arranged in the wall of a water delivery tunnel, the temperature measuring optical fiber is arranged in the infiltration collecting pipe, the spherical rubber water stopping is uniformly arranged on the temperature measuring optical fiber, and the temperature measuring optical fiber is connected with the DTS temperature measuring system.
2. The integrated test system of claim 1, wherein,
the crack light loss calibration system comprises a single optical fiber system and a double optical fiber system, wherein the first optical fiber comprises a first optical fiber, a second optical fiber and a third optical fiber, the first optical fiber is arranged in the single optical fiber system, and the second optical fiber and the third optical fiber are arranged in the double optical fiber system;
the first optical fiber is connected with the glass plate, and an angle between the optical fiber and the crack surface is alpha after the glass plate is moved;
the second optical fiber and the third optical fiber are connected with the glass plate, and the intersection angle of the second optical fiber and the third optical fiber is alpha 0 The intersection angle of the second optical fiber and the central line of the crack surface is alpha 2 The intersection angle of the third optical fiber and the central line of the crack surface is alpha 1 。
3. The integrated test system of claim 1, wherein,
the second optical fiber comprises a fourth optical fiber and a fifth optical fiber, and the extending intersection angle of the fourth optical fiber and the fifth optical fiber is alpha 0 The fourth optical fiber and the fourth optical fiberThe intersection point of the cracks is A1, and the intersection angle is alpha 1 The intersection point of the fifth optical fiber and the crack is A2, and the intersection angle is alpha 2 And when the crack intersects with the fourth optical fiber and the fifth optical fiber simultaneously, the relationship shown in formula (1) is satisfied:
α 0 ＝α 1 -α 2 (1)。
4. the method is used in a long-distance water delivery tunnel crack information comprehensive detection system, and the long-distance water delivery tunnel crack information comprehensive detection system comprises a crack light loss rate determination system, a tunnel crack comprehensive sensing arrangement system and a tunnel crack water seepage sensing arrangement system and is characterized by comprising the following steps:
measuring opening degree, position and direction information of the crack based on the crack light loss calibration system and the tunnel crack comprehensive sensing arrangement system;
and measuring the water seepage position of the crack based on the tunnel crack water seepage perception arrangement system.
5. The comprehensive test method according to claim 4, wherein,
the method for measuring the opening, position and direction information of the crack based on the crack optical loss calibration system and the tunnel crack comprehensive perception arrangement system comprises the following steps:
based on the crack optical loss calibration system, a semi-empirical formula (2) of an optical loss value and a crack opening degree is obtained:
in the formula (2), delta is the bending loss rate of the optical fiber, deltaL is the crack opening degree, K 1 ＝6.74，K 2 ＝1.60，K 3 ＝2.28，K 4 ＝0.2048；
Based on the formula (2) and the tunnel crack comprehensive perception arrangement system, a simultaneous calculation formula (3) for calculating the crack opening is obtained:
in the simultaneous calculation formula (3), δ 1 、δ 2 Bending loss rate of the fourth optical fiber and the fifth optical fiber, alpha 1 Alpha is the intersection angle of the fourth optical fiber and the crack 2 The intersection angle of the fifth optical fiber and the crack is delta L, and delta L is the opening of the crack;
based on the formula (1), the simultaneous calculation formula (3) and the extension intersection angle alpha of the fourth optical fiber and the fifth optical fiber 0 Calculating to obtain the opening of the crack;
and measuring optical loss at A1 and A2 by using an optical time domain reflectometer in the tunnel crack comprehensive sensing arrangement system, and further positioning to obtain position and direction information of the crack, wherein A1 is an intersection point of the fourth optical fiber and the crack, and A2 is an intersection point of the fifth optical fiber and the crack.
6. The comprehensive test method according to claim 4, wherein,
the water seepage position of the crack is measured based on the tunnel crack water seepage perception arrangement system, and the method comprises the following steps:
the width of the crack is wide enough to cause water leakage on the inner wall of the tunnel, the water leakage permeates into the water seepage collecting pipe to enable the spherical rubber water stop to expand when meeting water, and the water seepage collecting pipe and the spherical rubber water stop are arranged in the tunnel crack water seepage sensing arrangement system;
the spherical rubber water stop forms a partition to enable the leaked water to be collected in the water seepage collecting pipe;
and detecting the low temperature position of the temperature measuring optical fiber through a DTS temperature measuring system to obtain the water seepage position of the crack, wherein the DTS temperature measuring system and the temperature measuring optical fiber are both arranged in the tunnel crack water seepage sensing arrangement system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311649458.5A CN117781884A (en) | 2023-12-04 | 2023-12-04 | System and method for comprehensively detecting crack information of long-distance water delivery tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311649458.5A CN117781884A (en) | 2023-12-04 | 2023-12-04 | System and method for comprehensively detecting crack information of long-distance water delivery tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117781884A true CN117781884A (en) | 2024-03-29 |
Family
ID=90391867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311649458.5A Pending CN117781884A (en) | 2023-12-04 | 2023-12-04 | System and method for comprehensively detecting crack information of long-distance water delivery tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117781884A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292216A (en) * | 1999-04-02 | 2000-10-20 | Fujikura Ltd | Optical fiber sensor |
| US20100066560A1 (en) * | 2007-09-12 | 2010-03-18 | Hexion Specialty Chemicals, Inc. | Wellbore casing mounted device for determination of fracture geometry and method for using same |
| CN105259184A (en) * | 2015-11-24 | 2016-01-20 | 大连大学 | Tunnel-vault distributed optical fiber monitoring device, construction technology thereof and monitoring method thereof |
| CN107576420A (en) * | 2017-09-20 | 2018-01-12 | 郭泊远 | A kind of energy conduit leakage monitoring system |
| CN108709856A (en) * | 2018-07-19 | 2018-10-26 | 江苏省水利勘测设计研究院有限公司 | A kind of concrete structure crack monitoring and warning system and method for early warning |
| CN109682308A (en) * | 2018-12-21 | 2019-04-26 | 河海大学 | Plastic optical fiber Crack Monitoring device and monitoring method based on optical time domain reflection |
| CN111006604A (en) * | 2019-12-26 | 2020-04-14 | 胡美玉 | High-precision distributed tunnel crack monitoring system and method |
| US20210388712A1 (en) * | 2020-06-11 | 2021-12-16 | Exxonmobil Upstream Research Company | Methods of monitoring a geometric property of a hydraulic fracture within a subsurface region, wells that perform the methods, and storage media that direct computing devices to perform the methods |
| US20230054654A1 (en) * | 2021-08-20 | 2023-02-23 | Silixa Ltd. | Fracture detection using distributed optical fiber sensing |
| CN115930792A (en) * | 2022-12-07 | 2023-04-07 | 南华大学 | Tunnel full-life crack monitoring system and early warning method based on optical fiber sensing technology |
-
2023
- 2023-12-04 CN CN202311649458.5A patent/CN117781884A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292216A (en) * | 1999-04-02 | 2000-10-20 | Fujikura Ltd | Optical fiber sensor |
| US20100066560A1 (en) * | 2007-09-12 | 2010-03-18 | Hexion Specialty Chemicals, Inc. | Wellbore casing mounted device for determination of fracture geometry and method for using same |
| CN105259184A (en) * | 2015-11-24 | 2016-01-20 | 大连大学 | Tunnel-vault distributed optical fiber monitoring device, construction technology thereof and monitoring method thereof |
| CN107576420A (en) * | 2017-09-20 | 2018-01-12 | 郭泊远 | A kind of energy conduit leakage monitoring system |
| CN108709856A (en) * | 2018-07-19 | 2018-10-26 | 江苏省水利勘测设计研究院有限公司 | A kind of concrete structure crack monitoring and warning system and method for early warning |
| CN109682308A (en) * | 2018-12-21 | 2019-04-26 | 河海大学 | Plastic optical fiber Crack Monitoring device and monitoring method based on optical time domain reflection |
| CN111006604A (en) * | 2019-12-26 | 2020-04-14 | 胡美玉 | High-precision distributed tunnel crack monitoring system and method |
| US20210388712A1 (en) * | 2020-06-11 | 2021-12-16 | Exxonmobil Upstream Research Company | Methods of monitoring a geometric property of a hydraulic fracture within a subsurface region, wells that perform the methods, and storage media that direct computing devices to perform the methods |
| US20230054654A1 (en) * | 2021-08-20 | 2023-02-23 | Silixa Ltd. | Fracture detection using distributed optical fiber sensing |
| CN115930792A (en) * | 2022-12-07 | 2023-04-07 | 南华大学 | Tunnel full-life crack monitoring system and early warning method based on optical fiber sensing technology |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106764463B (en) | A kind of pipe leakage based on optical fiber grating sensing, on-line corrosion monitoring device and method | |
| Ren et al. | Pipeline corrosion and leakage monitoring based on the distributed optical fiber sensing technology | |
| CN108152297A (en) | Inside peep the device and method of water flood detection reinforcing bar half grout sleeve grouting plumpness | |
| WO2014101754A1 (en) | Multi-core optical fibre, sensing device adopting multi-core optical fibre and running method therefor | |
| CN109839317A (en) | A kind of micro indoor static cone penetration test system and method | |
| CN104100842A (en) | Pipeline monitoring device and system based on distributed fiber sensors and acoustic wave | |
| CN109030497B (en) | Concrete structure crack automatic monitoring system | |
| CN105259184A (en) | Tunnel-vault distributed optical fiber monitoring device, construction technology thereof and monitoring method thereof | |
| US7545998B2 (en) | System for measurement and detection of parameters and anomalies | |
| Xu et al. | Surface crack detection in Prestressed concrete cylinder pipes using BOTDA strain sensors | |
| CN113375879B (en) | Multi-parameter multi-mode high-precision pipeline leakage monitoring and positioning system | |
| CN205157454U (en) | Tunnel vault distributed optical fiber monitoring devices | |
| CN215262312U (en) | Multi-parameter multi-mode high-precision pipeline leakage monitoring and positioning system | |
| CN117781884A (en) | System and method for comprehensively detecting crack information of long-distance water delivery tunnel | |
| CN202255844U (en) | System for measuring loss of fiber cores at heterogeneous optical fiber fusion welding point | |
| Qiu et al. | Optical Fiber Sensor Experimental Research Based on the Theory of Bending Loss Applied to Monitoring Differential Settlement at the Earth‐Rock Junction | |
| CN104100841A (en) | Pipeline monitoring method based on distributed fiber sensors and acoustic wave | |
| CN203940243U (en) | A kind of pipeline monitoring device and system based on distributed fiberoptic sensor and sound wave | |
| KR102025272B1 (en) | Fiber-optic sensor system | |
| CN105784070A (en) | Method and platform for testing air-medium ultrasonic level gauge | |
| Wang et al. | A synchronous and accurate detection method for gas pipeline leakage position and flow rate based on double fiber Bragg gratings | |
| Cui et al. | Indoor study on road crack monitoring based on polymer optical fiber sensing technology | |
| CN104267000A (en) | Plastic optical fiber refractive index sensor on basis of micropore structure and preparation method and application thereof | |
| CN211504169U (en) | Water seepage blind ditch damage detection system based on distributed optical fibers | |
| Bassil et al. | Quantification of cracks in reinforced concrete structures using distributed fiber optic sensors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |