CN203479673U - Distributed fiber test platform for monitoring seepage of earth and rockfill dam - Google Patents
Distributed fiber test platform for monitoring seepage of earth and rockfill dam Download PDFInfo
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- CN203479673U CN203479673U CN201320433351.2U CN201320433351U CN203479673U CN 203479673 U CN203479673 U CN 203479673U CN 201320433351 U CN201320433351 U CN 201320433351U CN 203479673 U CN203479673 U CN 203479673U
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Abstract
The utility model discloses a distributed fiber test platform for monitoring seepage of an earth and rockfill dam. The platform comprises a heating system, a seepage system and a DTS (Distributed Fiber Temperature Sensor System). The platform is a practical platform with extremely high operability, is used for monitoring seepage of the dam and is based on construction of a dam seepage monitoring two-field coupling simplified model. Combined with the DTS, the platform can be used in a seepage monitoring project of a porous media structural body such as the earth and rockfill dam and a dyke in practice and can be a reliable test platform for various related test research. The platform has the advantages of wide test range, high precision, simplicity in arrangement, low monitoring cost, high work efficiency, high engineering adaptability and the like.
Description
Technical field
The utility model relates to a kind of distribution type fiber-optic test platform of monitoring native stone dam seepage situation, belongs to distributed optical fiber temperature sensor technology field.
Background technology
Optical fiber is not only as sensor but also as transmission medium, and it is simple in structure, and not only convenient construction but also maintainability are strong, reliability is high, and incipient fault rate is significantly less than conventional art.Mendez in 1989 etc. are first by since carrying out structural safety detection in Fibre Optical Sensor embedded concrete structure, and various countries scholar has further promoted the application of this technology in building, hydraulic engineering.In recent years, along with the construction of large hydraulic engineering and the requirement of modernization of water resources, distributed optical fiber temperature sensor technology has been successfully applied to mass concrete temperature, Crack Monitoring, slope monitoring and the monitoring of rock panel crack.
But for the seepage monitoring of the porous media structure bodies such as earth and rockfill dam and dykes and dams, also in exploring the qualitative stage.Theory in Quantitative Monitoring also exists many problems urgently study and solve with applying.Temperature, as a kind of natural tracer agent, has unique advantage in seepage monitoring, and the many cases of recent domestic have confirmed the importance of temperature parameter to dam seepage monitoring.Distributed optical fiber temperature sensing system (Distributed Fiber Temperature Sensor System), referred to as DTS system, is a kind of sensor-based system for measurement space temperature field distribution in real time that development in recent years is got up.In this system, optical fiber is sensor, is also the transmission channel of signal.Utilize Raman scattering to carry out distributed, successional real-time measurement to temperature.By distributed optical fiber temperature sensor technology, carry out dam leakage monitoring and caused showing great attention to of engineering circles and academia.As a kind of temperature sensing means, its theory and technology application is very ripe.
But the monitoring of leakage based on distributed optical fiber temperature sensor technology is as a kind of new application of this technology, its referential experience seldom, all awaits further further investigation in technology and construction technology.At present, the applied research of this technology in monitoring of leakage also rests on the qualitative stage, by monitoring abnormal temperature point, judges the general location of seepage, normally as the supplementary mode of other monitoring meanss.Because this technology is also immature in the theory of monitoring of leakage application aspect, particularly not yet set up at present causes between the same environment temperature of optical fiber heating temperature rise, heating power, seepage velocity, therefore, carrying out native stone dam seepage fiber-optic monitoring theoretical research and model test has great importance.
Utilize the seepage monitoring of optical fiber temperature-measurement to be divided into heating and gradient method, but now all research all concentrates in the derivation or simple experimental study of pure theoretical equation, the result causing is that the correctness of theoretical formula to be refused to say yes or no and to test in order testing, due to theoretical and test separated, up to the present, also do not set up a set of theory and its corresponding practical approach that operates being really applied in dam seepage monitoring, be therefore badly in need of wanting a native stone dam seepage test platform.
Utility model content
Utility model object: the purpose of this utility model is for the deficiencies in the prior art, a kind of distribution type fiber-optic test platform of monitoring native stone dam seepage situation is provided, the problem existing in Porous Media monitoring and measuring application is carried out to innovative research, the optical fiber that the experience of native bank of stone dam seepage velocity is monitored and obtained and saturation is monitored is laid to some row problems such as form and analytical approach the most reliable test platform is provided, and this platform has good stability, workable, precision is high, cost is low, engineering adaptability waits by force many merits.
Technical scheme: a kind of distribution type fiber-optic test platform of monitoring native stone dam seepage situation described in the utility model, comprises heating system, osmotic system, DTS system, data processing and Computer Aided Analysis System;
Described heating system comprises AC power and the load heating resistance wire of adjustable voltage, and the AC power of described adjustable voltage applies burning voltage to load heating resistance wire and heats;
Described osmotic system comprises model groove and water system, and described water system provides seepage flow for the porous medium in model groove;
Described DTS system comprises distributed optical fiber temperature measurement main frame and linear multimode temperature sensing optical fiber, and described load heating resistance wire is arranged in linear multimode temperature sensing optical fiber, and described linear multimode temperature sensing optical fiber is embedded in the porous medium in model groove; Described distributed optical fiber temperature measurement main frame obtains corresponding position and temperature information for gathering and analyze the time and intensity information of the Raman back-reflection light producing when laser pulse is propagated from the injection side injection of linear multimode temperature sensing optical fiber in optical fiber;
Described data processing and Computer Aided Analysis System comprise that data preparation module, figure check module, saturation analysis module and coefficient of heat conductivity computing module, and the test figure that can obtain described DTS system carries out that data preparation, figure are checked, saturation analysis and coefficient of heat conductivity calculate.
Further, described load heating resistance wire is the metal armour in linear multimode temperature sensing optical fiber or fixedly uses steel wire.
The AC power of described adjustable voltage comprises AC power, pressure regulator and load circuit, and described AC power is connected with the input end of pressure regulator, and the output terminal of described pressure regulator is connected with load circuit.
Because the resistance of the steel wire in optical fiber or metal armour is smaller, if need larger heating power, just need very large electric current, therefore when selecting pressure regulator, must consider the rated current of pressure regulator, the exciting current exciting during for fear of connection pressure regulator power supply is very large, easily cause air-break tripping operation and test and DTS system are caused to harmful effect, load circuit is improved, the first switch that described load circuit comprises, second switch, load heating resistance wire, pilot lamp and voltage table, described the first switch, second switch and load heating resistance wire are connected between the both positive and negative polarity of output terminal of pressure regulator successively, described pilot lamp and the first switch in parallel, voltage table and second switch, load heating resistance wire is in parallel.
Described model groove adopts all-cis formula completely to grout method, groove inside dimension is: long 2.6m, wide 1m, high 1.15m, its inwall is laid impervious barrier, in groove, lay the first thick loaded filter of 30cm, on the first loaded filter, lay the first anti-filter net, described the first anti-filter is laid the fine sand layer that 55cm is thick on the net, on described fine sand layer, lay the second anti-filter net, described the second anti-filter is laid the second loaded filter that 30cm is thick on the net, on the sidewall of described model groove, have water inlet, piezometric tube is buried hole and water delivering orifice underground, described water inlet, piezometric tube is buried hole underground and is positioned at the first loaded filter, described water delivering orifice is apart from notch 15cm, in the two lateral walls of described model groove, have two apart from the wall penetration optical fibers hole of bottom land 65cm, described wall penetration optical fibers hole is positioned on the axis of symmetry of two side.Described the first loaded filter and the second loaded filter consist of the medium of different-grain diameter.
Described linear multimode temperature sensing optical fiber comprises two optical fiber, be respectively 1# optical fiber and 2# optical fiber, described 1# optical fiber is through the wall penetration optical fibers hole in the two lateral walls of model groove, level is laid in fine sand layer, described 2# optical fiber and 1# optical fiber are laid in same plummet face and are converted into some horizontal segments parallel with 1# optical fiber, wherein there are three horizontal segments to be positioned at the below of 1# optical fiber, distance apart from 1# optical fiber is respectively 5cm, 15cm, 30cm, article two, horizontal segment is positioned at the top of 1# optical fiber, apart from the distance of 1# optical fiber, is respectively 5cm, 15cm.
Described water system comprises water tank, flow control valve, water pump and circulating water pool, described water tank is positioned at the top of circulating water pool and model groove, the bottom of described water tank is connected with circulating water pool by water inlet pipe, water pump, described water inlet pipe is provided with flow control valve, the bottom of described water tank is connected with the water inlet of model groove by rising pipe, described rising pipe is provided with flow control valve, and the upside of described water tank is provided with run-down pipe, and described run-down pipe is connected with circulating water pool.
By the fiber-optic monitoring principle of native stone dam seepage, two coupling models based on simplifying native stone seepage field of embankments and temperature field, by two the control differential equations that are quantitatively coupled that are applicable to dam seepage fiber-optic monitoring of deriving, and the susceptibility of the degree that influences each other between two, incidence relation based on seepage element and DTS thermometric information, has designed above-mentioned test platform.
Compared with prior art, its beneficial effect is the utility model: the utility model test platform (1) is a kind of extremely strong practical platform of the property grasped based on building two coupling simplified models of dam seepage monitoring and monitoring for dam seepage; (2) in conjunction with DTS system, developed a set of monitoring system towards seepage flow, for the seepage monitoring practical implementation of the porous media structure bodies such as earth and rockfill dam and dykes and dams provide may, for every correlation test research and establishment a reliable test platform; (3) this test platform also comprises that test figure that data processing and Computer Aided Analysis System obtain DTS system carries out that data preparation, figure are checked, saturation analysis and coefficient of heat conductivity calculate; (4) with respect to traditional dot matrix, monitor this test platform for all fronts any point probe temperature platform, and there is the many merits such as test specification is wide, precision is high, laying is simple, monitoring cost is low, work efficiency is high, engineering adaptability is strong; Generally speaking, this test platform have the complete novelty of design concept, mentality of designing complete tight, suit every advantages such as theoretical property is strong, workable, good endurance, anti-electromagnetic interference (EMI).
Accompanying drawing explanation
Fig. 1 is that test platform forms schematic diagram described in embodiment 1.
Fig. 2 is optical fiber type of heating schematic diagram described in embodiment 1.
Fig. 3 is load circuit schematic diagram described in embodiment 1.
Fig. 4 is data processing and Computer Aided Analysis System schematic diagram described in embodiment 1.
Fig. 5 is fiber arrangement and model groove front view in embodiment 1.
Fig. 6 is that in embodiment 1, sectional drawing is looked on a model groove left side.
Fig. 7 is the schematic diagram of water system model described in embodiment 1.
Embodiment
Below technical solutions of the utility model are elaborated, but protection domain of the present utility model is not limited to described embodiment.
embodiment 1:as shown in Figure 1, a kind of distribution type fiber-optic test platform of monitoring native stone dam seepage situation, comprises heating system 1, osmotic system 2, DTS system 3, data processing and Computer Aided Analysis System 4.
Described heating system comprises AC power and the load heating resistance wire of adjustable voltage, described load heating resistance wire is the steel wire 8 in linear multimode temperature sensing optical fiber, and the AC power of described adjustable voltage applies burning voltage to load heating resistance wire and heats.
Described osmotic system comprises model groove and water system, and described water system provides seepage flow for the porous medium in model groove.
Described DTS system comprises distributed optical fiber temperature measurement main frame and linear multimode temperature sensing optical fiber, and described linear multimode temperature sensing optical fiber is embedded in the porous medium in model groove, the inner packaging optical device of distributed optical fiber temperature measurement main frame, laser instrument, data processing module etc.; Optical fiber temperature-measurement main frame sets a pulse laser equipment, and its collinearity multimode temperature sensing optical fiber is connected and output laser pulse, and optical fiber afterbody is connected with the joints of optical fibre; The time and intensity information of the Raman back-reflection light that the collection of described distributed optical fiber temperature measurement main frame and analysis laser pulse produce while propagating in optical fiber from the injection side injection of linear multimode temperature sensing optical fiber obtains corresponding position and temperature information, after obtaining the temperature and positional information of every bit, can obtain a whole optical fiber along the temperature curve of journey diverse location.
Described data processing and Computer Aided Analysis System comprise that data preparation module, figure check module, saturation analysis module and coefficient of heat conductivity computing module, and the test figure that can obtain described DTS system carries out that data preparation, figure are checked, saturation analysis and coefficient of heat conductivity calculate;
Optical fiber that the present embodiment adopts, its outermost is restrictive coating, and interior is armor, has fixedly steel wire between restrictive coating and armor, and armor inside is optical fiber.Described AC power to optical cable inside fixedly steel wire apply burning voltage and heat.There are two fixedly steel wires optical cable inside, and steel wire heating is had to two kinds of modes, and as shown in Figure 2, mode one is two terminated lines, only to a steel wire heating; Mode two is single-ended wiring, and the other end is connected two steel wires.Consider the rated current of pressure regulator, as well as possible for heating effect under same current, the present embodiment is selected Second Linking Method mode.
As shown in Figure 3, the AC power of described adjustable voltage comprises AC power 5, pressure regulator 7 and load circuit, and described AC power 5 is connected with the input end of pressure regulator 7, and the output terminal of described pressure regulator 7 is connected with load circuit.
Because the steel wire resistance in optical fiber is smaller, if need larger heating power, just need very large electric current, therefore when selecting pressure regulator, must consider the rated current of pressure regulator, the exciting current exciting during for fear of connection pressure regulator power supply is very large, easily cause air-break tripping operation and test and DTS system are caused to harmful effect, load circuit is improved, the first air-break that described load circuit comprises, the second air-break, load heating resistance wire, pilot lamp and voltage table, described the first air-break, the second air-break and load heating resistance wire are connected between the both positive and negative polarity of output terminal of pressure regulator successively, described pilot lamp is in parallel with the first air-break, voltage table and the second air-break, load heating resistance wire is in parallel.
As illustrated in Figures 5 and 6, described model groove adopts all-cis formula completely to grout method, groove inside dimension is: long 2.6m, wide 1m, high 1.15m, its inwall is laid plastic sheeting as impervious barrier, in groove, lay the first thick loaded filter 9 of 30cm, on the first loaded filter 9, lay the first anti-filter net 10, described the first anti-filter is laid the fine sand layer 11 that 55cm is thick on the net, on described fine sand layer 11, lay the second anti-filter net 21, on described the second anti-filter net 21, lay the second loaded filter 22 that 30cm is thick, on the sidewall of described model groove, have water inlet 12, piezometric tube is buried hole 14 and water delivering orifice 13 underground, described water inlet 12, piezometric tube is buried hole 14 underground and is positioned at the first loaded filter, described water delivering orifice 13 is apart from notch 15cm, in the two lateral walls of described model groove, have two apart from the wall penetration optical fibers hole of bottom land 65cm, described wall penetration optical fibers hole is positioned on the axis of symmetry of two side, entery and delivery port water receiving pipe, piezometric tube and optical fiber adopt rubber to tie tight and 502 glue sealing waterproof with the interface section of plastic sheeting, utilize current that fine sand is filled closely knit.
Described linear multimode temperature sensing optical fiber comprises two optical fiber, be respectively 1# optical fiber 15 and 2# optical fiber 16, described 1# optical fiber 15 is through the wall penetration optical fibers hole in the two lateral walls of model groove, level is laid in fine sand layer 11, described 2# optical fiber 16 and 1# optical fiber 15 are laid in same plummet face and are converted into some horizontal segments parallel with 1# optical fiber, wherein there are three horizontal segments to be positioned at the below of 1# optical fiber, distance apart from 1# optical fiber is respectively 5cm, 15cm, 30cm, article two, horizontal segment is positioned at the top of 1# optical fiber, apart from the distance of 1# optical fiber, is respectively 5cm, 15cm.
As shown in Figure 7, described water system comprises water tank 17, flow control valve 18, water pump 19 and circulating water pool 20, described water tank 17 is positioned at the top of circulating water pool 20 and model groove, the bottom of described water tank 17 is connected with circulating water pool 20 by water inlet pipe, water pump 19, described water inlet pipe is provided with flow control valve 18, the bottom of described water tank 17 is connected with the water inlet of model groove by rising pipe, described rising pipe is provided with flow control valve 18, the upside of described water tank 17 is provided with run-down pipe, and described run-down pipe is connected with circulating water pool 20.
Above-mentioned test platform is mainly the relation between research heating power, media water-bearing rate and seepage velocity three, therefore mainly design three kinds of operating modes: unsaturation is without seepage flow operating mode, saturated without seepage flow operating mode, saturated flow operating mode; Unsaturation is mainly used to analyze the temperature rise situation of optical fiber under different water cut, different heating power without seepage flow operating mode; Saturated without seepage flow operating mode in order to study the coefficient of heat conductivity of optical fiber in saturated media, obtain heating power; Saturated flow operating mode is in order to research and analyse the correlationship of seepage velocity and temperature.
In test process, substantially to observe Fei Xier tri-principles (repeated test, randomization and Partial controll), utilize universal meter, measure the resistance of metal armour in its optical fiber, select heating power as required, and by the Material Physics operating mode in water system adjustment model groove, repeat difference and require the test experiments under operating mode.
It is numerous and jumbled data that this test platform collects test figure, wherein comprising the information such as location point, temperature, Stokes, anti-Stokes light on monitoring time and optical fiber, pick out be concerned about data, not only waste time and energy, and the artificial accuracy of extracting is also difficult to guarantee, utilize the utility model according to process and Computer Aided Analysis System can be fast in real time and analytical test data accurately.
As mentioned above, although represented and explained the utility model with reference to specific preferred embodiment, it shall not be construed as the restriction to the utility model self.Not departing under the spirit and scope prerequisite of the present utility model of claims definition, can make in the form and details various variations to it.
Claims (7)
1. a distribution type fiber-optic test platform of monitoring native stone dam seepage situation, is characterized in that, comprises heating system, osmotic system and DTS system;
Described heating system comprises AC power and the load heating resistance wire of adjustable voltage, and the AC power of described adjustable voltage applies burning voltage to load heating resistance wire and heats;
Described osmotic system comprises model groove and water system, and described water system provides seepage flow for the porous medium in model groove;
Described DTS system comprises distributed optical fiber temperature measurement main frame and linear multimode temperature sensing optical fiber, and described load heating resistance wire is arranged in linear multimode temperature sensing optical fiber, and described linear multimode temperature sensing optical fiber is embedded in the porous medium in model groove; Described distributed optical fiber temperature measurement main frame obtains corresponding position and temperature information for gathering and analyze the time and intensity information of the Raman back-reflection light producing when laser pulse is propagated from the injection side injection of linear multimode temperature sensing optical fiber in optical fiber.
2. a kind of distribution type fiber-optic test platform of monitoring native stone dam seepage situation according to claim 1, is characterized in that, described load heating resistance wire is the metal armour in linear multimode temperature sensing optical fiber or fixedly uses steel wire.
3. a kind of distribution type fiber-optic test platform of monitoring native stone dam seepage situation according to claim 2, it is characterized in that, the AC power of described adjustable voltage comprises AC power, pressure regulator and load circuit, described AC power is connected with the input end of pressure regulator, and the output terminal of described pressure regulator is connected with load circuit.
4. a kind of distribution type fiber-optic test platform of monitoring native stone dam seepage situation according to claim 3, it is characterized in that, the first switch that described load circuit comprises, second switch, load heating resistance wire, pilot lamp and voltage table, described the first switch, second switch and load heating resistance wire are connected between the both positive and negative polarity of output terminal of pressure regulator successively, described pilot lamp and the first switch in parallel, voltage table and second switch, load heating resistance wire are in parallel.
5. a kind of distribution type fiber-optic test platform of monitoring native stone dam seepage situation according to claim 1, it is characterized in that, the groove inside dimension of described model groove is: long 2.6m, wide 1m, high 1.15m, its inwall is laid impervious barrier, in groove, lay the first thick loaded filter of 30cm, on the first loaded filter, lay the first anti-filter net, described the first anti-filter is laid the fine sand layer that 55cm is thick on the net, on described fine sand layer, lay the second anti-filter net, described the second anti-filter is laid the second loaded filter that 30cm is thick on the net, on the sidewall of described model groove, have water inlet, piezometric tube is buried hole and water delivering orifice underground, described water inlet, piezometric tube is buried hole underground and is positioned at the first loaded filter, described water delivering orifice is apart from notch 15cm, in the two lateral walls of described model groove, have two apart from the wall penetration optical fibers hole of bottom land 65cm, described wall penetration optical fibers hole is positioned on the axis of symmetry of two side.
6. a kind of distribution type fiber-optic test platform of monitoring native stone dam seepage situation according to claim 5, it is characterized in that, described linear multimode temperature sensing optical fiber comprises two optical fiber, be respectively 1# optical fiber and 2# optical fiber, described 1# optical fiber is through the wall penetration optical fibers hole in the two lateral walls of model groove, level is laid in fine sand layer, described 2# optical fiber and 1# optical fiber are laid in same plummet face and are converted into some horizontal segments parallel with 1# optical fiber, wherein there are three horizontal segments to be positioned at the below of 1# optical fiber, distance apart from 1# optical fiber is respectively 5cm, 15cm, 30cm, article two, horizontal segment is positioned at the top of 1# optical fiber, distance apart from 1# optical fiber is respectively 5cm, 15cm.
7. a kind of distribution type fiber-optic test platform of monitoring native stone dam seepage situation according to claim 5, it is characterized in that, described water system comprises water tank, flow control valve, water pump and circulating water pool, described water tank is positioned at the top of circulating water pool and model groove, water inlet pipe is passed through in the bottom of described water tank, water pump is connected with circulating water pool, described water inlet pipe is provided with flow control valve, the bottom of described water tank is connected with the water inlet of model groove by rising pipe, described rising pipe is provided with flow control valve, the upside of described water tank is provided with run-down pipe, described run-down pipe is connected with circulating water pool.
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| CN103364321A (en) * | 2013-07-19 | 2013-10-23 | 河海大学 | Distributed optical fiber test platform for monitoring earth rock dam seepage condition |
| CN104977673A (en) * | 2015-06-19 | 2015-10-14 | 河海大学 | Automatic control heat source specially-produced single-mode fiber for hydraulic engineering seepage monitoring |
| CN105785068A (en) * | 2016-05-06 | 2016-07-20 | 河海大学 | Distributed fiber monitoring system and method for seepage flow velocity of hydraulic structural body |
| CN105973783A (en) * | 2016-06-01 | 2016-09-28 | 四川大学 | Parallel crack seepage experiment system and method based on 3D printing |
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| CN103364321A (en) * | 2013-07-19 | 2013-10-23 | 河海大学 | Distributed optical fiber test platform for monitoring earth rock dam seepage condition |
| CN104977673A (en) * | 2015-06-19 | 2015-10-14 | 河海大学 | Automatic control heat source specially-produced single-mode fiber for hydraulic engineering seepage monitoring |
| CN104977673B (en) * | 2015-06-19 | 2016-03-02 | 河海大学 | A kind of water conservancy project is surveyed and is oozed with automatic control thermal source grill slip mode fiber |
| CN105785068A (en) * | 2016-05-06 | 2016-07-20 | 河海大学 | Distributed fiber monitoring system and method for seepage flow velocity of hydraulic structural body |
| CN105973783A (en) * | 2016-06-01 | 2016-09-28 | 四川大学 | Parallel crack seepage experiment system and method based on 3D printing |
| CN105973783B (en) * | 2016-06-01 | 2018-12-11 | 四川大学 | Parallel fracture seepage experimental system and experimental method based on 3D printing |
| WO2018192344A1 (en) * | 2017-04-20 | 2018-10-25 | 苏州南智传感科技有限公司 | System and method for monitoring seepage rate and moisture content of rock-soil body based on ihat-fbg |
| CN108680477A (en) * | 2018-01-12 | 2018-10-19 | 浙江大学 | Based on laser measurement technology and the visual piping experimental rig of transparent soil and method |
| CN108680477B (en) * | 2018-01-12 | 2024-04-12 | 浙江大学 | Piping test device and method based on laser test technology and transparent soil visualization |
| CN109596496A (en) * | 2018-12-14 | 2019-04-09 | 西安理工大学 | A kind of sandy soil seepage discharge monitoring platform based on Si-DTS |
| CN110095396A (en) * | 2019-04-10 | 2019-08-06 | 三峡大学 | Earth and rockfill dam exception seepage flow combined type monitoring test device and method based on distributed optical fiber temperature measurement |
| CN110095396B (en) * | 2019-04-10 | 2021-06-18 | 三峡大学 | Combined monitoring test device and method for abnormal seepage of earth and rockfill dam based on distributed optical fiber temperature measurement |
| CN113252244A (en) * | 2021-05-31 | 2021-08-13 | 江西省港航建设投资集团有限公司 | Building structure leakage test system based on distributed optical fiber and test method thereof |
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