CN101799430B - Built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle - Google Patents
Built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle Download PDFInfo
- Publication number
- CN101799430B CN101799430B CN201010109990.4A CN201010109990A CN101799430B CN 101799430 B CN101799430 B CN 101799430B CN 201010109990 A CN201010109990 A CN 201010109990A CN 101799430 B CN101799430 B CN 101799430B
- Authority
- CN
- China
- Prior art keywords
- geomembrane
- optical fiber
- temperature
- seepage
- fiber
- 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.)
- Expired - Fee Related
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 84
- 230000006378 damage Effects 0.000 title claims abstract description 28
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 23
- 238000012544 monitoring process Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 14
- 230000002159 abnormal effect Effects 0.000 claims abstract description 7
- 238000013461 design Methods 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 24
- 230000008859 change Effects 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000005856 abnormality Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 2
- 239000011241 protective layer Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000001237 Raman spectrum Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
- 230000002787 reinforcement Effects 0.000 description 6
- 238000011160 research Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000004807 localization Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 241000227180 Lyonia ferruginea Species 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- VMQPMGHYRISRHO-UHFFFAOYSA-N benzvalene Chemical group C1=CC2C3C1C32 VMQPMGHYRISRHO-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000003621 irrigation water Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Images
Abstract
The invention relates to a rapid damage positioning scheme for an internal geomembrane in anti-seepage engineering, belonging to the technical field of hydraulic engineering (civil engineering)- anti-seepage engineering. The method comprises the following steps of: combining continuous optical fibers and the geomembrane into a whole, wherein the optical fibers are uniformly arranged in a snakelike shape on the geomembrane, and the distance between the optical fibers is not greater than the temperature-sensitive distance of double optical fibers; using the geomembrane as an anti-seepage material and making the optical fiber path of the whole anti-seepage area through; leading out the endpoints of the optical fibers to an optical fiber temperature-measurement detection device and covering a protective layer of the geomembrane; and establishing a conversion formula between the XY coordinate values of optical fiber length L and an anti-seepage face according to the arrangement design of the anti-seepage engineering, monitoring the temperature of each position of the geomembrane by adopting the optical fiber temperature-measurement detection device, judging the area with abnormal temperature comparison to be a seeping position and judging the position with highest temperature abnormality to be the central position of the geomembrane damage. The method solves the problem of difficult damage positioning of the geomembrane and can obviously improve the safety of a dam using the geomembrane as an anti-seepage body.
Description
Technical field
The present invention relates to the localization method of the inner geomembrane damage of a kind of seepage control project, belong to hydraulic engineering (civil engineering work)---the seepage control technique field
Background technology
Seepage failure is the main reason that causes the routed disaster of collapsing of dykes and dams.In the constituent material of antiseepage body, cheap, the good seepage-proof property of geomembrane, and have the clear superiority that adapts to dam body, foundation deformation are in many earthquake areas, especially be almost preferred material in the karst landform zone.Correlation technique is after nineteen seventies is introduced China, formed one and overlapped standard and the rules such as complete geomembrane production, check, the design of antiseepage body, quality control on construction, examination, bulk life time also is significantly improved---and life expectancy is near 100 years.Countries in the world are all recommending geomembrane as impervious material in various design specificationss and job specifications energetically, and before China, economic and commercial committee, Ministry of Water Resources have also successively organized more than 50 demonstration project, in the hope of promoting as early as possible its range of application.But tension, the shearing strength of geomembrane are lower, and the geomembrane in dykes and dams is in case impaired under the effects such as environment, water and soil biology, liner external force, and its " position of ftractureing is difficult to determine " this significant deficiency displays immediately.Pre-buried monitoring instrument spreads in the soil body rapidly after passing through geomembrane due to infiltration, even in dykes and dams, also can't be determined damage location.This drawback makes the of short duration repairing of cracking initial stage lose opportunity, causes tearing with seepage failure and sharply expands, and serious threat is to the safety of dykes and dams.Therefore geomembrane at dykes and dams, especially in application in high type earth and rockfill dam be subject to great restriction always.
The statistics of relevant department shows: be difficult in time discover, be difficult to the location due to the geomembrane in dykes and dams after being damaged and repair, most of engineerings (or even mini engineering) all are reluctant to use geomembrane, would rather be with at double cost, carry out large-scale watertight grouting.China has many areas to belong to earthquake-prone region, although its earthquake magnitude or to destroy earthquake intensity usually little, the antiseepage body that forms due to grouting is thin and crisp, relatively poor with the affinity of dam body materials, inevitable when dam is subjected to the shake distortion fracture or contact zones emanate.So grouting-seepage-grouting again-vicious circle circulation of seepage more just occurred in many places, spend the fund grouting of millions of～tens million of units at every turn, can only make the infiltration index of dam in 2～5 years reach corresponding standard.Bear Dayao County, the Yunnan dragon woods reservoir identified as example take the applicant: May calendar year 2001 dam grouting complete, flood season, the seepage flow index test was qualified then; Finding immediately after earthquake in July, 2003 than larger seepage before grouting, and the native dangerous situation of stream occurs, is three dams, class danger through secure authentication.The national debt fund of more than 200 ten thousand yuan only " reinforcing " this little (one) type reservoir dam 2 years, the cost of irrigation water is increased severely to unacceptable 3000～5000 yuan/m
3
By contrast, geomembrane belongs to flexible material, adaptive faculty to the distortion of the dam body dam foundation is very strong, in the situation that do not suffer external force to pierce through, tear, its aging speed can satisfy the economic life demand of most hydraulic engineerings, is specially adapted to many earthquake areas and karst area as cheap and good-quality impervious blanket.For example, the ground such as Kunming Golden Temple Reservoir region and Green Lake once leaked for a long time in a large number, repeatedly adopted concrete plug, fill concrete, filling grouting etc. all to fail to deal with problems, and used at last geomembrane to make the benzvalene form bedding, had just reached the target of leak-stopping seepage control.National great flood flood season in 1998, geomembrane is also the measure that the various places antiseepage is speedily carried out rescue work and the most generally adopted.In case the problem of geomembrane " damage location " is resolved, must improve geomembrane security performance, improve the cost performance of antiseepage body, obviously reduce the cost of dykes and dams; And can win the valuable repairing time for the dykes and dams after geomembrane destruction, effectively prevent the routed initiation disaster of collapsing of dykes and dams.
Data-searching shows, the research in the geomembrane association area both at home and abroad mainly concentrates on aspect two: the 1. research of laying process, and as screening, level, the thickness of bed course, and the relation of hydraulic pressure, measure etc. intercepts water in the corner; 2. the research of material modification, as manage to increase toughness, the plasticity of geomembrane, change thickness, lengthen the life anti-aging etc.But aspect " determining of built-in geomembrane damaged part ", not yet retrieve any research or achievement information.
" distributed optical fiber temperature measurement technology " is already ripe, is particularly suitable for the engineering of intensive monitoring on a large scale, has been successfully applied to the hydration heat monitoring of concrete dam, the fields such as temperature monitoring of high-tension cable.Temperature can be by saturated or unsaturated soil body transmission, and the variation of temperature in the stratum is continuous.Water density in the time of 4 ℃ is maximum, so the water temperature bottom reservoir is usually lower; Temperature Distribution in the stratum is just the opposite, and temperature stabilization raises along with the increase of the degree of depth.Many research is verified: the low temperature abnormality of finding in dykes and dams or the dam foundation is relevant with storehouse water concentrative seepage, so usable temp detects the concentrative seepage that geomembrane damage causes.In addition, " reinforcement " of pliable and tough optical fiber acts on, and can also obviously improve the properties of geomembrane.
Summary of the invention
Technical matters solved by the invention is: the monitoring of a kind of engineering built-in anti-seepage geomembrane damage is provided, and has determined fast the method for damage location, its principle mature and reliable, easy and simple to handle, quantitative test and calculating are quick.
Solving the scheme that technical matters of the present invention adopts is: continuous optical fiber and geomembrane are combined into one, and optical fiber is snakelike shape on geomembrane evenly distributed, and the spacing between optical fiber is less than or equal to the responsive to temperature distance of two times of optical fiber; As impervious material, and make the optic fibre light path conducting in whole antiseepage zone with geomembrane; Draw the end points of optical fiber to the optical fiber temperature-measurement pick-up unit, cover the protective seam of geomembrane; Press the layout design of seepage control project, set up the change type between the XY coordinate figure of fiber lengths L and antiseepage face, adopt the optical fiber temperature-measurement pick-up unit to monitor the temperature at each position of geomembrane, be seepage place the abnormal regional determination of temperature contrast occurring, and the maximum part of temperature anomaly is the center of geomembrane damage.
Concrete technical scheme of the present invention also comprises:
Described fibre diameter is 4 μ m～50 μ m, and the arrangement pitch≤1m between optical fiber, optical fiber both can sandwich in geomembrane or be pasted on a side of geomembrane, and perhaps optical fiber will be arranged near geomembrane responsive to temperature zone; Geomembrane is taked to lay along axis of dam direction, should not cut off optical fiber in the side, but the geomembrane of unnecessary width is embedded laying to antiseepage border (dam crest, the dam foundation etc.).
Should reserve the non-fiber overlapping region of 0.2m～0.5m at the edge of each width geomembrane, be used for being welded to each other or bonding, and adopt film to connect optical fiber that optical fiber welds each width geomembrane joint end to end outward, form the light path of a comprehensive conducting.
As the antiseepage main body of water retaining structure, concentrative seepage will appear in the damaged part of geomembrane.The repeatedly repeated experiments of carrying out under various environment temperatures, various ambient humidity all proves: the flowing of geomembrane damage position water body, therefore before will causing temperature and breakage herein, with near unbroken position, obvious difference is arranged all, can determine the damage location of geomembrane through the excess temperature contrast.Optical fiber temperature-measurement error≤0.03 ℃, the positioning error≤0.3m of built-in geomembrane damage.These parameters all is enough to satisfy the needs of seepage control project safety and reinforcement.
The function of each important composition of the present invention is:
(1) optical fiber geomembrane: geomembrane in retaining works as the antiseepage main body; The optical fiber geomembrane with wherein distribution type fiber-optic as intensive sensor, the temperature variation of each point in the monitoring geomembrane, and the judgment basis that breaks as geomembrane with " the temperature contrast is abnormal ".
(2) judgement temperature contrast is abnormal: concentrative seepage will appear in the damaged part of geomembrane, before the mobile temperature and breakage that causes herein of water body, and near unbroken position obvious difference is all arranged.Optical fiber temperature-measurement error≤0.03 ℃ contrasts the damage location that extremely comes to determine geomembrane by temperature.
(3) optical fiber temperature measurement system: take optical fiber as sensor, gather again and again the temperature value of each measuring point in geomembrane, and automatically contrast with before this temperature of this point, near the temperature of each measuring point, the temperature anomaly of finding to surpass threshold value is automatic sound-light alarm and show the fiber lengths L that abnormity point is corresponding.Can use the existing optical fiber temperature-measurement equipment such as Raman spectrum view.
(4) coordinate conversion of abnormity point: the laying construction with each building site geomembrane is designed to foundation, temperature is contrasted abnormity point be converted into the XY coordinate figure of antiseepage face to the fiber lengths L of initial point, make locator data consistent with engineering technical personnel's convention, be convenient to determine rapidly and accurately the damage location of geomembrane.
Principle of work of the present invention:
(1) anti-Stokes light intensity and temperature are closely related
Molecular scattering will occur in monochromatic (single-frequency) light in optical fiber, thus the Raman spectrum of generation and " the source light frequency is different ".Its medium frequency is called again stokes light lower than the composition of source light, and frequency is called again anti-Stokes light higher than the composition of source light; Frequency and the source equation of light not larger both sides spectral line are called large Raman spectrum.The business of the anti-Stokes light in large Raman spectrum and the light intensity of stokes light with the vibrational energy level of molecule---temperature is closely related, has had ripe theory and calculating formula.
(2) scattering of light and speed and optical fiber are closely related
The material of optical fiber, microscopical structure all have a direct impact Raman spectrum and velocity of propagation.As long as on-site proving the light velocity in optical fiber, set the interval of measuring point, according to the travel-time of Raman spectrum, just can calculate easily the fiber lengths of each measuring point.
(3) Fiber Optic Pyrometer is ripe
The successful Application that Fiber Optic Pyrometer is arranged in a lot of fields.For example: in network system, utilize optical fiber temperature-measurement to monitor the temperature anomaly of ultra high-tension transmission line; At mass concrete engineering, utilize optical fiber temperature-measurement to exceed standard with the hydration heat that monitors inside configuration; At concrete dam, utilize optical fiber temperature-measurement to determine the thin position of seeing leak path; Etc. too numerous to enumerate.
(4) temperature variation of built-in each measuring point of geomembrane is significantly related with concentrative seepage
Concentrative seepage will appear in the damaged part of geomembrane, before the mobile temperature and breakage that causes herein of water body, with near unbroken position obvious difference is all arranged.The temperature measurement error of optical fiber≤0.03 ℃ contrasts extremely by temperature and just can determine the damage location of geomembrane.
The invention has the beneficial effects as follows:
(1) provide the localization method of built-in geomembrane damage position
Be difficult to discover and locate reparation after geomembrane in dykes and dams is damaged, this drawback will be lost the repairing time, cause the even dam break of sharply expansion of seepage failure, and therefore the application of geomembrane all is subject to very large restriction always in worldwide.The present invention introduces the geomembrane anti-seepage technology with " optical fiber temperature-measurement " principle of maturation, lays practice in conjunction with the innovation of optical fiber geomembrane and antiseepage, has fundamentally solved the difficult problem that can't locate after the built-in geomembrane damage of seepage control project.Test shows: the positioning error of this invention is enough to satisfy the requirement of engineering safety and reinforcement lower than 0.3m.
(2) promote use, saving construction costs, the disaster reduction and prevention of geomembrane
Seepage failure is the dangerous condition of dykes and dams and causes routed main reason of collapsing, geomembrane is the flexible cheap impervious material of various countries' specification recommends, its expected life can satisfy the requirement of economic life of a project, in many earthquake areas, especially be almost preferred material in the karst landform zone, Ministry of Water Resources had also once organized a plurality of demonstration projects to be promoted.China is maximum, the sick dangerous section's journey of dykes and dams quantity maximum country in the world, and government all takes out the reinforcement that tens billion of funds are used for hydraulic engineering every year.Because this invention has solved " built-in geomembrane damage location " this key issue, geomembrane is as cheap and good-quality antiseepage body, its application category will obtain rapid expansion, replace gradually the high price structures such as filling grouting, grout curtain and even high-pressure rotary-spray grouting, cut-pff wall, thereby produce under the premise that security is guaranteed significant economic benefit.This technology all is of great importance for the security performance that improves geomembrane, the cost performance of improving the antiseepage body, the stability that increases dam slope, the reinforcement expense etc. of obviously saving dykes and dams, and the dykes and dams that wreck for geomembrane have won the valuable repairing time, can effectively reduce the generation of the routed disaster of collapsing of dykes and dams.
(3) innovation of " optical fiber geomembrane " has been proposed
Have benefited from the fast development of communication field, the diameter of optical fiber has reached 4 μ m, and transparency is enough, the existing example that uses G652 type optical fiber success thermometric 30km length, periphery to contain 0.5m, and pliability also meets " fiber " attribute fully.With the various geomembranes of the snakelike implantation of optical fiber, not only arranged intensive monitoring sensor, can also play the effect of " reinforcement ", improve the mechanical property of traditional geomembrane.
Description of drawings
Fig. 1 is optical fiber geomembrane structural representation of the present invention;
Fig. 2 is that geomembrane of the present invention is laid view.
In figure: geomembrane 1, optical fiber 2, antiseepage border 3, overlapping weldering film district 4, film connect optical fiber 5, dam crest 6 outward.
Embodiment
(1) make the optical fiber geomembrane
Referring to Fig. 1, in the production run of traditional geomembrane 1, optical fiber 2 is arranged in a serpentine fashion wherein, thereby obtains " optical fiber geomembrane ".If the fabric width of geomembrane is B, the geomembrane edge respectively stays δ (suggestion 0.25m) as the overlapping welding of non-fiber (bonding) zone, single long Γ of optical fiber
1=B-2 δ; Optical fiber is more responsive to the temperature variation in the 0.5m of its both sides, therefore the spacing Γ between temperature-measuring optical fiber
2≤ 1m (suggestion 0.6m).
(2) lay the optical fiber geomembrane
Referring to Fig. 2, in the work progress of seepage control project with above-mentioned optical fiber geomembrane 1 as impervious material, press current specifications construction.For avoiding too much fibre-optical splice and location Calculation loaded down with trivial details, suggestion is laid along axis of dam direction; Should not cut off in the side optical fiber 2, suggestion embeds the geomembrane of unnecessary width to antiseepage border 3 (dam crest, the dam foundation etc.).
(3) connect the light path of spectrum sensor and equipment
Lay complete after, according to the standard of communication optical fiber, the optical fiber 2 that connects each width geomembranes 1 of optical fiber 5 welding outward with film end to end, form the light path of a comprehensive conducting.Referring to Fig. 2, establish the length that each film connects optical fiber 5 outward and be respectively S
1, S
2...Draw the starting point of optical fiber, light path is communicated on the Raman spectrum temp measuring system, then press the protective seam (dam shell earth material, dam slope protection building stones etc.) that current specifications covers geomembrane.
(4) set up the coordinate conversion formula
Referring to Fig. 2, according to the layout design of seepage control project, use conventional mathematic(al) manipulation, derive fiber lengths L take the temp measuring system entrance as initial point O and the change type between the XY coordinate figure.
(5) temperature monitoring
Set the measuring point interval (suggestion 0.01m) on optical fiber, demarcate the light velocity in this project employing optical fiber.Automatically monitor again and again the temperature variation of each measuring point of geomembrane inner fiber with optical fiber temperature measurement system (Raman spectrum view, etc.), and automatically contrast with before this temperature of this point, near the temperature of each measuring point; The temperature anomaly that find to surpass threshold value is automatic sound-light alarm and show that abnormity point is apart from the fiber lengths L of temp measuring system entrance.Temperature anomaly threshold value suggestion: the 0.5min interval, with measuring point contrast 〉=± 0.6 ℃, with near 〉=0.2 ℃ of each measuring point contrast.
(6) coordinate conversion of locator value
Based on the change type that step (4) is set up, the fiber lengths L of the maximum abnormity point in temperature contrast district is converted into the XY coordinate figure of geomembrane damage position.
For example, establish in Fig. 2 the H point and surpass threshold value because of geomembrane perforation, temperature anomaly, optical fiber temperature measurement system is reported to the police and is shown that the L value of two optical fiber abnormity point is respectively L
1=1089.00m and L
2=1095.10m, the abnormal temperature increment is respectively Δ T
1=0.58 ℃ and Δ T
2=1.89 ℃.Can determine the coordinate of geomembrane damage position in the dam through lower column operations.
1. suppose by design and construction note known: geomembrane fabric width B=6m; Edge overlapping non-fiber zone δ=0.25m; 5 geomembranes (from top to bottom) are long C respectively
1=120m, C
2=113m, C
3=103m, C
4=89m, C
5=70m; Film connects optical fiber (from top to bottom) long S respectively outward
1=16m, S
2=16m, S
3=9m, S
4=19m.Film inner fiber interval Γ
2=0.6m, the long Γ of optical fiber list
1=B-2 δ=5.5m.
2. final acceptance of construction is calculated: the fiber lengths D in each geomembrane (from top to bottom)
D
1＝(C
1-2δ)/Γ
2×(Γ
1+Γ
2)+Γ
1＝1220.42m
D
2＝(C
2-2δ)/Γ
2×(Γ
1+Γ
2)+Γ
1＝1149.25m
D
3＝(C
3-2δ)/Γ
2×(Γ
1+Γ
2)+Γ
1＝1047.58m
D
4＝(C
4-2δ)/Γ
2×(Γ
1+Γ
2)+Γ
1＝905.25m
D
5＝(C
5-2δ)/Γ
2×(Γ
1+Γ
2)+Γ
1＝712.08m
3. the coordinate conversion of fiber-optic monitoring abnormity point: L
1＜L
2＜D
1Therefore it is D that two temperature anomaly points all are positioned at length
1Geomembrane in.
Because of int[L
1/ (Γ
1+ Γ
2)]=178, int[L
2/ (Γ
1+ Γ
2)]=179, remainder is 0.52＜Γ
1, on the X value all without the impact.Therefore X
1=int[L
1/ (Γ
1+ Γ
2)] * Γ
2=106.80m
X
2＝int[L
2/(Γ
1+Γ
2)]×Γ
2＝107.40m
Because of L
1, L
2Respectively corresponding optical fiber space-number 178 be that even number, 179 is odd number, 0.52 pair of Y value of remainder respectively from upper, certainly exert an influence down: Y
1=0.52m; Y
2=Γ
1-0.52=4.98m.
4. calculate the coordinate of geomembrane drilling point H: some H is to the distance of both sides fiber optic temperature abnormity point, is approximated to inverse ratio with the increment Delta T of abnormal temperature.
(H
X-X
1)∶(X
2-H
X)≈ΔT
2∶ΔT
1；(H
Y-Y
1)∶(Y
2-H
Y)≈ΔT
2∶ΔT
1
Bring the data that obtain previously into, the coordinate that can solve geomembrane drilling point H is: H
X≈ 107.26m, H
Y≈ 3.93m.
Claims (3)
1. built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle, it is characterized in that: continuous optical fiber and geomembrane are combined into one, optical fiber is snakelike shape on geomembrane evenly distributed, and back and forth the spacing between adjacent fiber is less than or equal to the responsive to temperature distance of two times of optical fiber; As impervious material, make the conducting light paths of the regional optical fiber of whole antiseepage with geomembrane; Draw the end points of optical fiber to the optical fiber temperature-measurement pick-up unit, cover the protective seam of geomembrane; Press the layout design of seepage control project, set up the change type between the coordinate figure of fiber lengths L and antiseepage face, monitor the temperature at each position of geomembrane with the optical fiber temperature-measurement pick-up unit, be seepage place the abnormal regional determination of temperature contrast occurring, the maximum part of temperature anomaly be defined as the center of geomembrane damage.
2. by the built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle claimed in claim 1, it is characterized in that: described fibre diameter is 4 μ m～50 μ m, back and forth arrangement pitch≤the 1m between adjacent fiber; Geomembrane is taked to lay along axis of dam direction, at the antiseepage boundary, the geomembrane of unnecessary width is laid to antiseepage border embedding.
3. by the built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle claimed in claim 2, it is characterized in that: should reserve the non-fiber overlapping region of 0.2m～0.5m at the edge of each width geomembrane, and adopt film to connect optical fiber that optical fiber welds each width geomembrane joint end to end outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010109990.4A CN101799430B (en) | 2010-02-20 | 2010-02-20 | Built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010109990.4A CN101799430B (en) | 2010-02-20 | 2010-02-20 | Built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101799430A CN101799430A (en) | 2010-08-11 |
| CN101799430B true CN101799430B (en) | 2013-05-08 |
Family
ID=42595195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010109990.4A Expired - Fee Related CN101799430B (en) | 2010-02-20 | 2010-02-20 | Built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101799430B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106931896A (en) * | 2017-03-31 | 2017-07-07 | 四川大学 | The optical fiber sensing technology and system of geomembrane anti-seepage earth and rockfill dam deformation monitoring |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306019A (en) * | 2011-06-22 | 2012-01-04 | 宋志军 | Method for monitoring closed circular coal yard optical fiber temperature and optical fiber monitoring device |
| CN104236827B (en) * | 2013-06-09 | 2016-12-28 | 同济大学 | A kind of Tunnel Water Leakage detection method based on thermograde and device |
| CN103412142B (en) * | 2013-09-10 | 2015-04-08 | 河海大学 | Device and method for monitoring and testing seepage speed of porous medium structural body |
| CN105297783B (en) * | 2015-10-22 | 2017-03-08 | 昆明理工大学 | One kind can monitor many material joint seepage prevention systems |
| CN105738268B (en) * | 2016-05-10 | 2017-06-16 | 河海大学 | Hydraulic Projects observed seepage behavior Integrated Monitoring System and monitoring method under complex environment |
| CN112227303B (en) * | 2020-08-24 | 2021-08-27 | 河海大学 | Optical fiber detection system for determining seepage position of reservoir seepage-proofing panel |
| CN113607336A (en) * | 2021-07-28 | 2021-11-05 | 安徽理工大学 | Distributed detection system and detection method for leakage of vertically-paved plastic seepage-proof curtain |
| CN113739868B (en) * | 2021-09-10 | 2023-07-28 | 武汉理工大学 | Real-time early warning and monitoring system and method for ponding of natural sponge facility |
| CN114323335B (en) * | 2022-03-16 | 2022-06-21 | 浙江大学湖州研究院 | Distributed optical fiber temperature measurement system for high-temperature pipeline group |
| CN115162389B (en) * | 2022-08-25 | 2023-07-18 | 中煤科工集团西安研究院有限公司 | Anti-seepage and monitoring integrated mine anti-seepage membrane curtain water interception method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030035099A1 (en) * | 2001-07-16 | 2003-02-20 | Kazunaga Kobayashi | Distortion measuring apparatus and distortion measuring method using this apparatus |
| CN1588013A (en) * | 2004-08-24 | 2005-03-02 | 西安科技大学 | Snake type fiber-optical sensor burying and detecting method and its snake type fibre-optical sensor |
| WO2006001071A1 (en) * | 2004-06-25 | 2006-01-05 | Neubrex Co., Ltd. | Distributed optical fiber sensor |
| CN1901418A (en) * | 2006-07-21 | 2007-01-24 | 南京大学 | Method and system for monitoring soil property side slope distributive fiber optic strain |
| CN101490522A (en) * | 2006-07-13 | 2009-07-22 | 法国坦卡特土工合成材料公司 | Device, system and method of detecting and locating malfunctions in a hydraulic structure, and a hydraulic structure equipped with said device |
-
2010
- 2010-02-20 CN CN201010109990.4A patent/CN101799430B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030035099A1 (en) * | 2001-07-16 | 2003-02-20 | Kazunaga Kobayashi | Distortion measuring apparatus and distortion measuring method using this apparatus |
| WO2006001071A1 (en) * | 2004-06-25 | 2006-01-05 | Neubrex Co., Ltd. | Distributed optical fiber sensor |
| CN1588013A (en) * | 2004-08-24 | 2005-03-02 | 西安科技大学 | Snake type fiber-optical sensor burying and detecting method and its snake type fibre-optical sensor |
| CN101490522A (en) * | 2006-07-13 | 2009-07-22 | 法国坦卡特土工合成材料公司 | Device, system and method of detecting and locating malfunctions in a hydraulic structure, and a hydraulic structure equipped with said device |
| CN1901418A (en) * | 2006-07-21 | 2007-01-24 | 南京大学 | Method and system for monitoring soil property side slope distributive fiber optic strain |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106931896A (en) * | 2017-03-31 | 2017-07-07 | 四川大学 | The optical fiber sensing technology and system of geomembrane anti-seepage earth and rockfill dam deformation monitoring |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101799430A (en) | 2010-08-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101799430B (en) | Built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle | |
| CN101793502B (en) | Method for detecting breakage position of built-in geomembrane by fiber strain | |
| CN201660871U (en) | Geomembrane with function of positioning damaged position | |
| KR101294136B1 (en) | Device for prediction underground dynamic behavior by using acoustic emission sensor and producing method thereof | |
| CN105698897A (en) | Distributed optical fiber sensing technology and system for earth-rock dam seepage line monitoring | |
| Zheng et al. | Leakage detection and long-term monitoring in diaphragm wall joints using fiber Bragg grating sensing technology | |
| Wang et al. | Performance evaluation of buried pipe under loading using fiber Bragg grating and particle image velocimetry techniques | |
| Chai et al. | Experimental study on PPP-BOTDA distributed measurement and analysis of mining overburden key movement characteristics | |
| Inaudi et al. | Monitoring dams and levees with distributed fiber optic sensing | |
| Lin et al. | Experimental and numerical investigations into leakage behaviour of a novel prefabricated utility tunnel | |
| Jiang et al. | Use of Brillouin optical time domain reflectometry to monitor soil-cave and sinkhole formation | |
| CN206829119U (en) | A kind of prewetting method for ground treatment structure of collapsible loess | |
| CN204080780U (en) | for tunnel earth pressure gauge embedding device | |
| Artières et al. | Fiber optics monitoring solution for canal dykes | |
| JP4366829B2 (en) | Water shielding structure management system | |
| Yang et al. | Sensor monitoring of a newly designed foundation pit supporting structure | |
| CN104215365A (en) | Pavement structure layer internal shearing stress testing sensor and embedding technology and application thereof | |
| CN204882545U (en) | In same direction as layer rock matter side slope testing system that slides | |
| CN104123433A (en) | Method for determining soil deformation caused by high-pressure horizontal rotary jet grouting construction | |
| Piao et al. | Application of distributed optical fiber sensing technology in the anomaly detection of shaft lining in grouting | |
| CN115655343A (en) | Dam safety monitoring system and monitoring method based on distributed optical fiber sensing technology | |
| Zhu et al. | Seepage and settlement monitoring for earth embankment dams using fully distributed sensing along optical fibers | |
| CN203241304U (en) | Formation fracturing resistance test apparatus | |
| CN102677645B (en) | Multi-field coupling real-time sensing method for horizontal frozen soil | |
| Inaudi et al. | Paradigm shifts in monitoring levees and earthen dams: distributed fiber optic monitoring systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130508 Termination date: 20150220 |
|
| EXPY | Termination of patent right or utility model |