CN107794882B - Geomembrane convenient for large-area leakage detection and leakage detection method thereof - Google Patents
Geomembrane convenient for large-area leakage detection and leakage detection method thereof Download PDFInfo
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- CN107794882B CN107794882B CN201710974229.9A CN201710974229A CN107794882B CN 107794882 B CN107794882 B CN 107794882B CN 201710974229 A CN201710974229 A CN 201710974229A CN 107794882 B CN107794882 B CN 107794882B
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- 238000001514 detection method Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000010365 information processing Effects 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 8
- 230000002265 prevention Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000009529 body temperature measurement Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000013307 optical fiber Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000004746 geotextile Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000010291 electrical method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- DPGAAOUOSQHIJH-UHFFFAOYSA-N ruthenium titanium Chemical compound [Ti].[Ru] DPGAAOUOSQHIJH-UHFFFAOYSA-N 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/40—Investigating fluid-tightness of structures by using electric means, e.g. by observing electric discharges
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Abstract
The invention discloses a geomembrane convenient for large-area leakage detection, which is formed by seamlessly splicing a plurality of single geomembranes; a plurality of electrodes are preset at corresponding positions on the upper surface and the lower surface of the single geomembrane, a pair of two corresponding electrodes is formed, each electrode is correspondingly connected with one lead, each lead is insulated with each other and is attached to the surface of the single geomembrane, wherein the lead on each single geomembrane is connected to a circuit bus through a circuit branch line, each single geomembrane corresponds to one circuit branch line, and the terminal of the circuit bus is connected with an instrument panel and an external power supply; also discloses a leakage detection method of the geomembrane. According to the invention, detection equipment does not need to be started all the time during leakage detection, energy is effectively saved, the detection equipment and the geomembrane are integrated, the detected position can be adjusted only by rotating the gear shifting knob during operation, and the operation and construction are convenient.
Description
Technical Field
The invention relates to a geomembrane leakage detection technology, in particular to a geomembrane convenient for large-area leakage detection and a leakage detection method thereof.
Background
The geomembrane has the advantages of small permeability coefficient, large elongation, good environmental protection benefit (relative to seepage prevention of concrete and clay materials), light weight, softness, easy construction, strong regional adaptability, high factory production quality guarantee rate, more convenient operation and maintenance and the like, and is widely applied to the field of seepage prevention, small roof waterproofing, large dam seepage prevention and large dam seepage prevention. In addition, along with the scientific development of geomembrane materials, the performance of the geomembrane is improved, the application of the geomembrane is wider, and the use scale is larger and larger in recent years. In some large-scale hydraulic engineering, such as dam, reservoir, dyke and other engineering, the application prospect of the geomembrane is good. The geomembrane is more and more favored by the masses of engineering personnel by virtue of the advantages of easy construction, short construction period, low manufacturing cost and the like.
The geomembrane is applied to the middle and low dams, the application technology is mature, the experience is rich, and the use effect is good. At present, the geomembrane is developing towards the application aspect of a high dam, and a Laos south European river six-level hydropower station has a dam height of 85 meters and is just used for preventing seepage due to exposure of the composite geomembrane. Geomembranes are also used in reservoir seepage control applications, and only a few examples are as follows: li Yang pumped storage power stationThe geomembrane is used for preventing seepage at the bottom of the upper reservoir and has a laying area of 25 ten thousand meters2(ii) a The geomembrane at the bottom of the upper reservoir of the Thai pumped storage power station has seepage prevention and the laying area is about 17.7 ten thousand meters2(ii) a In the great reservoir of northern province of northeast Shandong province of south Water, PE geomembrane 501 ten thousand meters is paved for reservoir disk seepage prevention2(ii) a In the Marshan pumped storage power station, the laying area of the geomembrane at the bottom of the reservoir is 23.5 ten thousand meters2(ii) a The area of the earth work film at the bottom of the reservoir of the full-capacity pumped storage power station is 49.1 ten thousand meters2. Therefore, in many projects, the usage amount of the geomembrane is very large and reaches hundreds of thousands of square meters.
In the engineering of large-area geomembranes, the problem of leakage detection of the geomembrane during construction and operation is very prominent, which may be a very important factor limiting the large-area use of the geomembrane. Although the current technology for detecting the leakage of the geomembrane is various, such as: the method comprises a double-electrode method, a resistivity method (an electrode grid method), a high-voltage direct current method, a groundwater monitoring method, a diffusion tube method, a capacitance sensor method, a tracer method and the like, but the methods are mainly used for detecting the leakage condition of the geomembrane in a small range and can not effectively solve the problem of leakage detection of the large-area underwater geomembrane in the operation period. Although the distributed optical fiber temperature measurement technology can realize large-range temperature measurement, on one hand, the distributed optical fiber temperature measurement technology is interfered by the rise of underground water level, and on the other hand, the distributed optical fiber temperature measurement technology is expensive to use in a large range. The detection principle of the electrical method is that the electrical insulation property of the geomembrane and the electrical conductivity of liquid are utilized, if the geomembrane is not damaged, a current loop cannot be formed due to the insulation property of the geomembrane, and a signal cannot be detected; if the geomembrane is damaged, the current passes through the damaged part (leak) to form a current loop, so that an electric signal can be detected, and the leak is positioned according to the distribution rule of the detection signal. This method is currently very robust in geomembrane leakage measurement, but has not been effectively applied to large area geomembrane leakage detection problems.
In the engineering of large-area geomembranes such as reservoir bottom seepage prevention and the like of a reservoir, after the reservoir is used for storing water, if the geomembrane at a certain position is damaged to cause seepage, the damaged position of the geomembrane is difficult to be timely and effectively measured, so that the large-area use of the geomembrane is greatly limited.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a geomembrane convenient for large-area underwater leakage detection, and aims to provide a leakage detection method of the geomembrane.
The technical scheme is as follows: the geomembrane convenient for large-area leakage detection comprises a plurality of single geomembranes which are seamlessly spliced; the upper surface and the lower surface of the single geomembrane are correspondingly provided with a plurality of electrodes, the corresponding two electrodes form a pair, each electrode is correspondingly connected with one conducting wire, each conducting wire is insulated with each other and is attached to the surface of the single geomembrane, so that the geomembrane, the electrodes and the conducting wires form an organic whole, the conducting wires on each single geomembrane are connected to a circuit bus through circuit branch lines, each single geomembrane corresponds to one circuit branch line, all the lines are insulated with each other, and the terminal of the circuit bus is connected with an instrument panel and an external power supply.
The connected instrument panel is provided with a plurality of rotary switches, each rotary switch is correspondingly connected with a circuit branch line of each single geomembrane, and different gears of each rotary switch are correspondingly connected with different counter electrodes on the single geomembrane.
And a positive electrode interface and a negative electrode interface which are connected with an external power supply are arranged on each rotary switch.
The purpose of electrifying a circuit with a certain pair of electrodes by using an external power supply is achieved by rotating to different gears.
In order to ensure that the wires attached to the geomembrane do not influence the splicing between the two geomembranes, grooves can be reserved at the positions where the wires are spliced by the two geomembranes during production, so that the wires are embedded into the grooves of the geomembranes, and the welding of the geomembranes can not be influenced.
Furthermore, the two sides of the single geomembrane are wrapped with geotextiles, so that the effect of protecting the geomembrane is achieved.
Meanwhile, the quick and effective connection between the wires can be realized through the adapter, the wires are connected to the adapter, and the adapter is formed by combining the protruding plug and the groove connector, so that the quick and effective connection of the wires during construction can be realized.
The leakage detection method of the geomembrane convenient for large-area leakage detection comprises the following steps:
(1) dividing a geomembrane in a region to be detected into a plurality of detection units by using the idea of breaking up into parts, wherein each detection unit comprises a plurality of single geomembranes, and each detection unit is connected with an instrument panel;
(2) the method comprises the steps of firstly, carrying out rough leakage judgment on a detection unit by using the thought from rough to fine, arranging a drainage channel in the detection unit, and judging whether the detection unit leaks or not by measuring and analyzing flow speed and water pressure information in the drainage channel;
(3) selecting a detection unit with leakage, finely judging the leakage position, sequentially connecting an external power supply to a rotary switch corresponding to each single geomembrane in the detection unit, rotationally shifting gears, selecting to apply voltage to different counter electrodes in the single geomembrane, testing whether a measured counter electrode corresponding circuit generates current through a current testing device, and thus performing leakage detection.
The step (2) is specifically as follows: the detection unit is internally provided with a drainage channel such as a drainage blind pipe, a leakage detection device such as a current meter or an osmometer is arranged in the drainage blind pipe, the measured information is transmitted to the information processing terminal in a wired or wireless mode, the information is analyzed by the information processing terminal, and whether leakage occurs in the detection unit or not is judged.
Has the advantages that: compared with the prior art, the invention has the advantages that: (1) firstly, the geomembrane provided by the patent has a self-detection function, and detection equipment is organically combined with the geomembrane in advance during factory production, so that the quality is effectively ensured, and the construction is facilitated; (2) secondly, the method realizes the detection of the leakage of the large-area geomembrane by two steps by using the thought from coarse to fine, does not need to start all detection equipment all the time, and effectively saves energy; (3) as long as this patent is simply through the knob of shifting of rotating, the realization that just can be convenient applys voltage to the different counter electrodes on the single width geomembrane, and it is very convenient to operate.
Drawings
FIG. 1 is a schematic view of a geomembrane structure of the present invention facilitating large area leak detection;
fig. 2 is an enlarged view of a portion of the geomembrane of fig. 1;
fig. 3 is a plan view of a single geomembrane electrode of the present invention;
FIG. 4 is a schematic cross-sectional view of a single earth working mold of the present invention;
FIG. 5 is a schematic diagram of a circuit bus terminal instrument panel according to the present invention;
FIG. 6 is an enlarged view of the construction of a single geomembrane joint according to the present invention;
FIG. 7 is a schematic view of a transition joint for a line connection according to the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
The geomembrane convenient for large-area leakage detection as shown in fig. 1 and 2 comprises a plurality of single geomembranes 1 which are seamlessly spliced; the geomembrane adopts HDPE geomembrane with the thickness of 2.0mm, the width of a single geomembrane is 5m, the length of the single geomembrane is 100m, three rows of geomembranes form a detection unit 101, and each row is provided with 5 single geomembranes 1.
As shown in fig. 3 and 4, 8 electrodes 2 are preset at corresponding positions on the upper and lower surfaces of each single geomembrane 1, and form a pair corresponding to two electrodes 2, 4 pairs in total, the electrodes are ruthenium-titanium plated sheet electrodes (diameter 50mm, thickness 1mm), each electrode 2 is correspondingly connected with one lead 3, each lead 3 is isolated by an insulating coating and attached to the surface of the single geomembrane 1, wherein the lead 3 on each single geomembrane 1 is connected to a circuit bus 5 through a circuit branch 4, each single geomembrane 1 corresponds to one circuit branch 4, each detection unit 101 corresponds to one circuit bus 5, and the terminal of the circuit bus 5 is connected with an instrument panel 6 and an external power supply.
As shown in fig. 5, a plurality of rotary switches 601 are provided on the instrument panel 6, and each rotary switch 601 is correspondingly connected to a circuit branch of each single geomembrane 1.
Different gears of each rotary switch 601 are correspondingly connected with different counter electrodes 2 on the single geomembrane 1.
Each rotary switch 601 is provided with a positive electrode interface 602 and a negative electrode interface 602 which are connected with an external power supply, and different pairs of electrodes can be adjusted by rotating a gear shifting knob 603 to be detected.
As shown in fig. 6, the connecting end of the adjacent single geomembranes 1 is provided with a groove for embedding the wires 3, and two sides of the single geomembrane 1 are wrapped and covered with geotextiles 7.
As shown in fig. 7, the wire is connected to the end of the wire by a transition joint 9 which is a combination of a male plug 901 and a female connector 902.
The leakage detection method of the geomembrane convenient for large-area leakage detection comprises the following steps:
(1) dividing the geomembrane of an area to be detected into a plurality of detection units 101, wherein each detection unit 101 comprises a plurality of single geomembranes 1, and each detection unit 101 is connected with an instrument panel 6;
(2) the center of the detection unit 101 is provided with a drainage blind pipe 8, the drainage blind pipe 8 penetrates through the whole detection unit 101, meanwhile, drainage blind pipes with smaller diameters are arranged perpendicular to the drainage blind pipe every 10m, so that leakage water in the area of the detection unit 101 is guided into the drainage blind pipe 8 to be discharged, a flow velocity meter or a seepage pressure meter is arranged inside the drainage blind pipe 8, information of the measured flow velocity and the measured water pressure is transmitted to an information processing terminal, the information is analyzed, and whether leakage occurs in the detection unit 101 is judged;
(3) selecting a detection unit with leakage, finding out a terminal instrument panel corresponding to the detection unit, sequentially selecting a rotary switch 601 corresponding to a single geomembrane 1, connecting an external power supply to positive and negative interfaces 602 corresponding to the rotary switch 601, sequentially rotating a gear shifting knob 603, applying voltage to different counter electrodes on the single geomembrane, and if a circuit corresponding to a certain counter electrode is found to have current during power supply, proving that the leakage exists in a control range corresponding to the counter electrode.
Claims (6)
1. The utility model provides a geomembrane convenient to large tracts of land seepage detects which characterized in that: the geomembrane is formed by seamlessly splicing a plurality of single geomembranes (1); the upper surface and the lower surface of the single geomembrane (1) are correspondingly provided with a plurality of electrodes (2), a pair of two corresponding electrodes (2) is formed, each electrode (2) is correspondingly connected with one lead (3), each lead (3) is insulated with each other and is attached to the surface of the single geomembrane (1), wherein the lead (3) on each single geomembrane (1) is connected to a circuit bus (5) through a circuit branch (4), each single geomembrane (1) corresponds to one circuit branch (4), and the terminal of the circuit bus (5) is connected with an instrument panel (6) and an external power supply; adjacent the link of single width geomembrane (1) is equipped with the recess that supplies wire (3) embedding, single width geomembrane (1) both sides parcel has geotechnological cloth (7), the wire passes through crossover sub with the tip of wire to be connected, and this crossover sub is formed by outstanding plug and groove connection head combination.
2. The geomembrane facilitating large area leak detection according to claim 1, wherein: the instrument panel (6) is provided with a plurality of rotary switches (601), and each rotary switch (601) is correspondingly connected with a circuit branch line of each single geomembrane (1).
3. The geomembrane facilitating large area leak detection according to claim 2, wherein: different gears of each rotary switch (601) are correspondingly connected with different counter electrodes (2) on the single geomembrane (1).
4. The geomembrane facilitating large area leak detection according to claim 2, wherein: and each rotary switch (601) is provided with a positive electrode interface and a negative electrode interface (602) which are connected with an external power supply.
5. The method for leak testing a geomembrane for facilitating large area leak testing according to claim 1, 2, 3 or 4, wherein: the method comprises the following steps:
(1) dividing the geomembrane of an area to be detected into a plurality of detection units, wherein each detection unit comprises a plurality of single geomembranes, and each detection unit is connected with an instrument panel;
(2) arranging a drainage channel in the detection unit, and judging whether the detection unit leaks or not by measuring and analyzing flow speed and water pressure information in the drainage channel;
(3) selecting a detection unit with leakage, sequentially connecting an external power supply to a rotary switch corresponding to each single geomembrane in the detection unit, rotationally shifting gears, selecting to apply voltage to different counter electrodes in the single geomembrane, and testing whether a measured circuit corresponding to the counter electrodes generates current through a current testing device, thereby carrying out leakage detection.
6. The method of leak testing a geomembrane facilitating large area leak testing according to claim 5, wherein: the step (2) is specifically as follows: a drainage blind pipe (8) is arranged in the detection unit, a flow velocity meter or an osmometer is arranged in the drainage blind pipe (8), the measured information is transmitted to an information processing terminal, the information is analyzed, and whether leakage occurs in the detection unit or not is judged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710974229.9A CN107794882B (en) | 2017-10-19 | 2017-10-19 | Geomembrane convenient for large-area leakage detection and leakage detection method thereof |
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| CN201710974229.9A CN107794882B (en) | 2017-10-19 | 2017-10-19 | Geomembrane convenient for large-area leakage detection and leakage detection method thereof |
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| CN107794882B true CN107794882B (en) | 2020-02-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108755595B (en) * | 2018-06-27 | 2020-11-24 | 红河哈尼族彝族自治州水利水电工程地质勘察咨询规划研究院 | Seepage-proofing geomembrane seepage maintenance device and maintenance method for reservoir area |
| CN109403270B (en) * | 2018-09-26 | 2021-12-10 | 中国中元国际工程有限公司 | Construction method for geomembrane fixing leakage detection drainage exhaust member of pumped storage power station |
| CN109738138B (en) * | 2019-01-31 | 2020-11-24 | 河北工程大学 | Method and system for positioning HDPE (high-density polyethylene) film leakage position by utilizing traveling wave |
| CN110952506B (en) * | 2019-12-16 | 2021-03-30 | 兰州理工大学 | Self-conveying water-stone separated type flood discharge aqueduct and construction method |
| CN114509217B (en) * | 2022-01-24 | 2023-10-20 | 中国长江三峡集团有限公司 | Reservoir leakage detection device and detection method thereof |
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| CN1979152A (en) * | 2005-12-07 | 2007-06-13 | 中国环境科学研究院 | Double-electrode detection method and apparatus for seepage of seepage-proof layer |
| CN101210855B (en) * | 2006-12-27 | 2010-06-16 | 中芯国际集成电路制造(上海)有限公司 | Multipath fluid leakage detector |
| CN102889967B (en) * | 2012-10-12 | 2015-10-28 | 重庆新和平自动化有限公司 | Refuse landfill geomembrane seepage rapid detection system and detection method |
| US9033620B2 (en) * | 2013-02-11 | 2015-05-19 | Gse Environmental, Llc | Leak detectable geomembrane liners for containment system and method of testing for leaks |
| CN104677565B (en) * | 2015-02-15 | 2017-09-05 | 中国科学院武汉岩土力学研究所 | A kind of damaged leakage detection method of landfill site seepage prevention layer |
| CN205015444U (en) * | 2015-09-02 | 2016-02-03 | 四川正升环保科技有限公司 | Bipolar electrode high voltage insulation detector |
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