CN1920178A - Distributed optical fiber sensing monitoring based dam seepage analog apparatus - Google Patents
Distributed optical fiber sensing monitoring based dam seepage analog apparatus Download PDFInfo
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- CN1920178A CN1920178A CNA2006100322585A CN200610032258A CN1920178A CN 1920178 A CN1920178 A CN 1920178A CN A2006100322585 A CNA2006100322585 A CN A2006100322585A CN 200610032258 A CN200610032258 A CN 200610032258A CN 1920178 A CN1920178 A CN 1920178A
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Abstract
The invention relates to a simulator based on the distributed optical fiber sensation to detect dam seepage, wherein it comprises: optical fiber sensing demodulator, sensing optical cable embedded into the dam model media inside the box; and the dam seepage simulating controlling unit around the sensing optical cable which mainly comprises a main transmitting tube and several branch transmitting tubes inserted into the box; the end of branch transmitting tube has media filter network and temperature humidity sensor; the mina transmitting tube has flux control valve; the bottom of box has movable bottom plate; therefore, it can simulate the detection on the dam seepage. And it can be used to search the dam seepage or be used as experiment equipment.
Description
Technical field
The present invention relates to a kind of analogue means, especially a kind of analogue means based on the distributed optical fiber sensing monitoring dam seepage.
Background technology
Seepage and piping are the main causes that dyke destroys, bursts, monitoring to temperature in the dike is an effective means of surveying and discern dyke seepage flow and seepage, especially the distributed optical fiber temperature sensing system of development in recent years can be 1 meter long-term continuous monitoring to the temperature implementation space resolution ratio on tens of km length, and can accurately locate, be particularly suitable for monitorings such as river levee, reservoir dam.At present, adopt the object of distributed optical fiber temperature sensing system monitoring to mainly contain three classes both at home and abroad: the first kind is the seepage of pipeline, and second class is the cable of power plant or transformer station, and the 3rd class is the dam of concrete structure.Adopt the less of temperature monitoring for the seepage flow in earth dam or the earth and rockfill dam, the safety problem of dyke more and more needs dam is carried out omnibearing monitoring, and is anxious to be solved based on the application problem of distributed optical fiber temperature sensing system in the dyke safety monitoring.But earth embankment and Tu Shidiba and concrete dam are in structure or cause at inner seepage flow in the change of medium temperature that very big difference is all arranged.Have following wretched insufficiency if adopt to select actual dam to carry out field trial: the seepage flow of dykes and dams and seepage be one by the slow process that occurs to development, just form piping when serious, it is unrealistic and acquire a certain degree of difficulty to be used for the long term monitoring on the spot of scientific research experimental period; Be difficult for finding accurately the dykes and dams section that takes place or seepage will take place; Can not take out easily in case the optical cable that is used to test is imbedded in the dykes and dams, need lay optical cable, expense height again when changing the dykes and dams section; To can not repeated test with a kind of flow event; Distance between seepage flow and optical cable can not be chosen arbitrarily, is unfavorable for studying the influence of the distance of optical cable and seepage flow origination point to test signal.Therefore, make up a dam seepage analogue means, with the platform of the Changing Pattern of thermal field in these dykes and dams that cause as research seepage flow phreatic line position distribution, seepage flow etc., so that lay scheme according to useful result of study design sensing optic cable the best on dyke; Study the rule that concerns between leakage and the fiber-optic signal, for the alarm threshold value of determining the embankment safety monitor and early warning system provides foundation.Publication number CN1632496A is the dam leakage positioning distributed fibre-optical temperature sensing monitor and the method for Chinese invention patent application, disclosed the employing bidirectional coupler, wavelength division multiplexer, avalanche diode, main amplifier, sample mean device and accumulator, computer, driver, signals collecting and treatment system that the laser diode module sensing optic cable is formed, this device is to lay on real dyke whether the fiber optic cable monitor dam seepage takes place and the location depended software system of seepage flow point, can not be at short notice to the seepage flow degree of seepage flow point and seepage flow dot spacing from signal study, be not easy to change rapidly tested object, be not easy to change mounting means after the installation, can not be used as experimental study well.The Chinese utility model patent of publication number CN200320127902.9 disclosed layer net equipressuring plate and seepage simulation test device, adopt skeleton stratum reticulare and sand prevention stratum reticulare to form layer net equipressuring plate, only provide the part technical measures for simulation seepage flow, it or not a whole set of analogue means, and can not simulate the situation of single-point seepage flow, not possess distributed monitoring capability.
Summary of the invention
At above-mentioned situation, the present invention provides a kind of simple in structure, and small investment is easy to operate, can simulate the dam seepage of different medium fast, and the seepage flow degree is controlled, but identical operating mode repetition based on distributed fiber temperature sensing monitoring dam seepage analogue means.
For achieving the above object, a kind of analogue means based on the distributed optical fiber sensing monitoring dam seepage, it mainly comprises the Fibre Optical Sensor demodulating unit, the sensing optic cable that is connected with the Fibre Optical Sensor demodulating unit, wherein sensing optic cable is embedded in the interior dykes and dams model media of casing, described sensing optic cable is fixed on the casing through optical cable fixing device, be provided with dam seepage simulation and control module around the described sensing optic cable in the dam model medium, described dam seepage simulation comprises that with control module one is fixed on the main woven hose on the antinose-dive leg, Cheng Duozhi divided woven hose to stretch in the interior dykes and dams simulation medium of casing after this main woven hose passed box body wall, place, its minute woven hose mouth of pipe end establishes the medium filter screen and reaches the fixedly fixed disk of Temperature Humidity Sensor sensing head, described Temperature Humidity Sensor sensing head is electrically connected with display on being fixed on main woven hose, described main woven hose is provided with each minute woven hose flow control valve, described main woven hose end is provided with piecing devices and the flexible pipe that is connected with power source, and described bottom half is provided with movable floor and discharging bolt.
For implementation structure optimization, its further step is:
Described optical cable fixing device is arranged at the U type groove place on the box bilateral wall, settles sensing optic cable, U type groove to be provided with the husky bar of the retaining that inserts optical cable fixing device in the U type groove.
Described piecing devices comprise the fixed flange that is fixed in main woven hose delivery end and the moving flange plate and the rubber sheet gasket that adapt to fixed flange, and they are clamped in one through bolt, and described moving flange plate is provided with arc groove.
Be provided with intercepter plate in the described main woven hose, connect firmly at least three branch woven hoses on this intercepter plate.
Described flow control valve is provided with the control delivery port that is connected with the computer USB interface.
Dam model medium in the described casing is sand or soil or rock or their mixture.
Described sensing optic cable be arranged in parallel in casing several sections.
Described analogue means can expand to the analogue means of two covers and the above same structure of two covers.
The present invention adopts sensing optic cable is embedded in the dam model medium in the casing, thereby realize the technical scheme that monitoring is simulated to dam seepage, having overcome existing dam seepage detection system true seepage flow of direct monitoring after install at a place needs long-time standby just can obtain monitoring result and changes the defective that need bury optical cable when monitoring the place again underground; Be suitable for adopting the positioning distributed fibre-optical temperature sensing monitoring technology to be used for the research of dam seepage, also can make the usefulness of teaching experimental equipment simultaneously.
The present invention has compared to existing technology:
1) determines simulation seepage flow point fast;
2) the seepage flow degree is controlled;
3) energy is studied the dykes and dams of different medium within a short period of time with identical optical cable;
4) can simulate the infiltration of different liquids or gas;
5) flow event can reproduce;
6) sensing optic cable can repeatedly use;
7) be not subjected to effect of natural conditions, but long run test;
8) seepage flow point and sensing optic cable locus are adjustable, help studying distance between seepage flow point and sensing optic cable to advantages such as the influence of test signal and optimization sensing optic cable laying schemes.
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Description of drawings
Fig. 1 is the topology layout schematic diagram of analogue means of the present invention.
Fig. 2 is the phantom drawing of the oblique upper end of analogue means of the present invention.
Fig. 3 is the phantom drawing of analogue means polycrystalline substance shown in Figure 2.
Fig. 4 is the front view of dam seepage simulation and control module in the analogue means shown in Figure 1.
Fig. 5 is the front view of intercepter plate shown in Figure 4.
Fig. 6 is the left view of piecing devices shown in Figure 4.
Fig. 7 is the right view of piecing devices shown in Figure 4.
Fig. 8 is the sectional views of piecing devices shown in Figure 6 along A-A.
Fig. 9 is the enlarged drawing of Temperature Humidity Sensor fixed disk shown in Figure 4.
Figure 10 is the left view of Fig. 9.
The phantom drawing that Figure 11 be arranged in parallel in casing for sensing optic cable shown in Figure 1.
1. Fibre Optical Sensor demodulating units among the figure, 11. sensing optic cables, 12. optical fiber demodulating systems, 13. optical cables volume, 14. the sensing optic cable joint, 15. termination boxes, 2. optical cable fixing device, 21. chuck, 22. base plates, 3. casing, 31. movable floor, 32. discharging bolts, 33. limited blocks, 34. keep off husky bar, 4. dam seepage is simulated and control module, 41. clamping devices, 5. branch woven hose, 51. fixed covers, 52. medium filter screens, 53. fixed disk, 54. screens platforms, 55. Temperature Humidity Sensor sensing heads, 56. display, 6. main woven hose, 61. flow control valves, 611. the control delivery port, 62. intercepter plates, 63. circular holes, 64. piecing devices, 641. bolts, 642. moving flange plates, 643. rubber sheet gasket, 644. fixed flanges, 645. arc grooves, 65. snake-like hose, 66. water source interface pipe, 7. power sources.
The specific embodiment
By accompanying drawing as seen, a kind of analogue means based on the distributed optical fiber sensing monitoring dam seepage, it mainly comprises Fibre Optical Sensor demodulating unit 1 and dam seepage simulation and control module 4, this Fibre Optical Sensor demodulating unit 1 is by sensing optic cable 11, optical fiber demodulating system 12, optical cable volume 13, sensing optic cable joint 14, termination box 15 is formed, sensing optic cable 11 is embedded in the casing 3 interior dykes and dams model medias, sensing optic cable 11 is in optical cable fixing device 2 is fixed in U type groove on casing 3 two sides, optical cable fixing device is arranged on the casing 3 outer wall bottoms of U type groove, establishes the husky bar 34 of retaining on the U type groove and inserts in the optical cable fixing device 2.Optical cable fixing device 2 comprises the fixedly chuck 21 and the base plate 22 of sensing optic cable 11, base plate 22 has the stopper slot that inserts the husky bar 34 of retaining, on the U type groove two side that is bolted to casing 3, in order to make the husky bar 34 of retaining can be close to casing 3 two sides, set up limited block 33 in upper end, casing 3 two side.
Referring to accompanying drawing, be provided with dam seepage simulation and control module 4 around the sensing optic cable 8 in the dam model medium, it mainly divides woven hose 5 to form by a main woven hose 6 and a Duo Zhi who is fixed on the antinose-dive leg, divide woven hose 5 to connect firmly by the intercepter plate 62 that is arranged in the main woven hose 6, intercepter plate 62 is nested in the inwall of main woven hose 6, establish the circular hole 63 that connects firmly branch woven hose 5 on the intercepter plate 62, fix a branch woven hose 5 in each circular hole 63, three circular holes 63 in the present embodiment connect firmly at least three branch woven hoses 5.
Shown in accompanying drawing, Cheng Duozhi divided woven hose 5 to stretch in the casing 3 interior dykes and dams simulation mediums after main woven hose 6 passed box body wall, place, its minute woven hose 5 mouth of pipe ends establishes medium filter screen 52 and reaches the fixedly fixed disk 53 of Temperature Humidity Sensor sensing head 55, medium filter screen 52 is fixed between branch woven hose 5 mouth of pipe ends and the fixed cover 51 by fixed cover 51, and fixed cover 51 is connected with the mode of dividing woven hose 5 mouth of pipe ends with screw thread, wherein 53 of the fixed disks of Temperature Humidity Sensor sensing head 55 are clamped together by screens platform 54 on minute woven hose 5 and fixed cover 51, Temperature Humidity Sensor sensing head 55 interts on the circular hole of fixed disk 53, this fixed disk 53 can be done 360 degree rotations around minute woven hose 5, when forwarding correct position to, tighten fixed cover 51, fixed disk 53 is clamped between fixed cover 51 and the screens platform 54, Temperature Humidity Sensor sensing head 55 is electrically connected with display 56 on being fixed on main woven hose 6, realize humiture monitoring and to the control of seepage flow flow and with the comparison of sensing optic cable demodulation result, main woven hose 6 is provided with each minute woven hose flow control valve 61, the flow of a branch woven hose 5 of a control valve control, can be connected with the computer USB interface by the control delivery port 611 of flow control valve 61 and realize control in real time, also can be by the control panel hand-guided on the control valve, be provided with the piecing devices 64 of carrying pipe end to be connected with power source 7 at main woven hose 6 ends, piecing devices 64 comprise fixed flange 644 that is fixed in main woven hose 6 delivery ends and moving flange plate 642 and the rubber sheet gasket 643 that adapts to fixed flange 644, they are clamped in one through bolt 641, on moving flange plate 642, be provided with angle adjustment arc groove 645, moving flange plate 642 and fixed flange 644 can be adjusted by angle adjustment arc groove 645 in main woven hose 6 radial positions, the seepage flow mouth can be around the approximate 360 ° of rotations continuously of main woven hose, realize that approximate 360 degree on seepage flow mouth and sensing optic cable 11 vertical direction are adjustable, piecing devices 64 1 ends are connected with snake-like hose 65, unclamp dam seepage simulation and control module clamping device 41, main, divide woven hose to regulate the horizontal direction position by snake-like hose 65, after finishing, adjustment regulates clamping device 41, fixedly dam seepage simulation and control module 4 realizes that seepage flow mouth and sensing optic cable 11 are adjustable in the horizontal direction.
Operating principle of the present invention and operation:
Be liquid medium with water in the embodiment, and can in medium, add color.
The sensing optic cable chuck 21 that sensing optic cable 11 is passed optical cable fixing device 2 is across in the sensing optic cable U of box bilateral wall type groove, clamp chuck 21, the base plate 22 of optical cable fixing device 2 is covered on casing 3 two sides, the husky bar 34 of retaining is passed the stopper slot of limited block 33 insertion optical cable fixing devices 2 base plates 22 of upper end, casing 3 two side, fixedly optical cable fixing device 2 is on casing 3 two sides with screw, and the while is clamped in the husky bar 34 of retaining between base plate 22 and casing 3 two sides.Main woven hose 6 is passed casing 3 walls, adjust the position of dividing woven hose 5 mouths of pipe and sensing optic cable 11, the adjustment fixedly clamping device 41 of dam seepage and piping simulation and control module 4 of back that finishes, fixing main, divide the woven hose position, with bolt 641 is piecing devices 64 that fixed flange 644 and moving flange plate 642 and the rubber sheet gasket 643 that adapts to fixed flange 644 are clamped in one, load onto snake-like hose 65 at fixed flange 644 ends again, at snake-like hose 65 other end filled with water source interface pipes 66, if adjust the vertical direction 360 degree angles of dividing woven hose 5 mouths of pipe and sensing optic cable 11, unclamp the bolt 641 of fixed clamping device 41 and piecing devices 64, adjust bolt 641 in the angle of moving flange plate 642 and adjust the position of arc groove 645, fastening bolt 641 and fixed clamping device 41 after adjustment finishes, if adjust the horizontal level that divides woven hose 5 mouths of pipe and sensing optic cable 11, unclamp clamping device 41, move main woven hose, the length of its horizontal direction is by snake-like hose 65 compensation, adjust finish after fixed clamping device 41 again.Put the fixed disk 53 of Temperature Humidity Sensor sensing head 55 at minute woven hose 5 mouth of pipe places, cover medium filter screen 52 simultaneously, screw in fixed cover 51 again, fix the fixed disk 53 of medium filter screen 52 and Temperature Humidity Sensor sensing head 55, intert into Temperature Humidity Sensor sensing head 55 on the circular hole of the fixed disk 53 of Temperature Humidity Sensor sensing head 55, being electrically connected connects Temperature Humidity Sensor sensing head 55 and the display 56 that is fixed on the main woven hose 6.If adjust the position of the circumferencial direction of the Temperature Humidity Sensor sensing head 55 and branch woven hose 5 mouths of pipe, unclamp fixed cover 51, the fixed disk 53 of rotation Temperature Humidity Sensor sensing head 55, adjust fastening again fixed cover 51 behind the position of Temperature Humidity Sensor sensing head 55 and the circumferencial direction that divides woven hose 5 mouths of pipe, at last, cover movable floor 31, fix discharging bolt 32.
In casing 3, fill medium, as sand, soil, rock or their mixture.Present embodiment is filled up casing 3 and compacting with sand, connect Fibre Optical Sensor demodulating unit 1, the control delivery port 611 of flow control valve 61 is connected with the computer USB interface, adjust flow control valve 61 positions, open power source 7 switches, allow the leakage medium be that the liquid of water enters in the casing 3 in the dykes and dams model medias, carry out data acquisition and analysis then.When the needs adjustment divides the position of woven hose 5 mouths of pipe and sensing optic cable 11, pull up discharging bolt 32, open movable floor 31, unload the dykes and dams simulation medium, unclamp fixed clamping device 41, the bolt 641 of releasable joint device 64 is adjusted the level of branch woven hose 5 mouths of pipe and sensing optic cable 11 and the position of vertical direction, fixed clamping device 41, the bolt 641 of secure splice device 64, adorn medium again in casing 3, compacting remeasures.Pull up discharging bolt 32 after Measurement and analysis finishes, open movable floor 31, unload the dykes and dams simulation medium.Repeat above step when testing next time.If study of the detection of different sensing optic cable sections to the same seepage flow point under the different distance, several sections sensing optic cables 11 then be arranged in parallel in the dykes and dams simulation medium in casing 3, position that adjust to divide woven hose 5 mouths of pipe and sensing optic cable 11 can realize 11 pairs of same seepage flow points of multistage sensing optic cable such as two sections or three sections or four sections are surveyed simultaneously.If research is remote and a so far apart multistage dam monitoring and signal transmission, the analogue means that described analogue means can expand at least two covers and the above same structure of two covers carry out many places to be measured, can connect between two covering devices long range hadn wheel around optical cable.
Fibre Optical Sensor demodulating unit 1 adopts a kind of distributing optical fiber sensing detection system that is used for monitoring in real time variations in temperature on the optical cable segment, main stimulated Brillouin scattering principle according to optical fiber.Ooze out when reaching to a certain degree from seepage flow mouth medium filter screen 52 when oozing body, certain variation will take place in the temperature around the sensing optic cable 11, sensing optic cable 11 these variations of induction, sensing optic cable 11 reaches information optical fiber demodulating system 12 simultaneously, thereby judges seepage flow position and seepage flow degree by optical fiber demodulating system 12.The The data control corresponding scheme of measuring according to Temperature Humidity Sensor can contrast with the shown data of Fibre Optical Sensor demodulating unit 1 simultaneously.
Utilize the present invention can simulate multiple seepage environment, as improving room temperature, simulation dykes and dams ambient climate changes, also can be with the shower nozzle water spray, with the dykes and dams medium of simulation different moisture content on analogue means.According to the difference of room temperature, can adopt gradient method and heating.Gradient method is to utilize optical fiber directly to measure the Temperature Distribution that seepage flow causes dam and embankment drastic change, thereby determines the method for seepage flow position.The prerequisite of this method successful Application is that the interior medium temperature of analogue means and the liquid of seepage simulation and control module 4 exist certain temperature difference.The temperature difference is big more, and seepage flow causes local temperature to change also more greatly, and temperature gradient is also big more, easy more judgement seepage flow point position.Heating is for heating the method that the optical fiber ambient temperature is raise then determine the position by metal center protective casing or the special electric conductor energising that is provided with.This method is not needed the condition restriction of temperature difference.By heating the optical fiber ambient temperature is raise, when there was seepage flow in dykes and dams, this place's fiber optic temperature rises will be obviously smaller, and temperature will be hanged down, thereby makes seepage flow obtain the location.
Claims (8)
1. analogue means based on the distributed optical fiber sensing monitoring dam seepage, it mainly comprises Fibre Optical Sensor demodulating unit (1), the sensing optic cable (11) that is connected with Fibre Optical Sensor demodulating unit (1), it is characterized in that sensing optic cable (11) is embedded in the interior dykes and dams model media of casing (3), described sensing optic cable (11) is fixed on the casing (3) through optical cable fixing device (2), described sensing optic cable (11) is provided with dam seepage simulation and control module (4) in the dam model medium on every side, described dam seepage simulation comprises that with control module (4) one is fixed on the main woven hose (6) on the antinose-dive leg, Cheng Duozhi divided woven hose (5) to stretch in the interior dykes and dams simulation medium of casing (3) after this main woven hose (6) passed box body wall, place, its minute woven hose (5) mouth of pipe end establishes medium filter screen (52) and reaches the fixedly fixed disk (53) of Temperature Humidity Sensor sensing head (55), described Temperature Humidity Sensor sensing head (55) is electrically connected with display (56) on being fixed on main woven hose (6), described main woven hose (6) is provided with each minute woven hose (5) flow control valve (61), described main woven hose (6) end is provided with piecing devices (64) and the flexible pipe (65) that is connected with power source (7), and described casing (3) bottom is provided with movable floor (31) and discharging bolt (32).
2. a kind of analogue means according to claim 1 based on the distributed optical fiber sensing monitoring dam seepage, it is characterized in that described optical cable fixing device (2) is arranged at the U type groove place on casing (3) two side, settle sensing optic cable (11) in the U type groove, U type groove is provided with the husky bar (34) of the retaining that inserts optical cable fixing device (2).
3. a kind of analogue means according to claim 1 based on the distributed optical fiber sensing monitoring dam seepage, it is characterized in that described piecing devices (64) comprise the fixed flange (644) that is fixed in main woven hose (6) delivery end and adapt to the moving flange plate (642) and the rubber sheet gasket (643) of fixed flange (644), they are clamped in one through bolt (641), and described moving flange plate (642) is provided with arc groove (645).
4. a kind of analogue means based on the distributed optical fiber sensing monitoring dam seepage according to claim 1 is characterized in that being provided with intercepter plate (62) in the described main woven hose (6), connects firmly at least three branch woven hoses (5) on this intercepter plate (62).
5. a kind of analogue means based on the distributed optical fiber sensing monitoring dam seepage according to claim 1 is characterized in that described flow control valve (61) is provided with the control delivery port (611) that is connected with the computer USB interface.
6. a kind of analogue means based on the distributed optical fiber sensing monitoring dam seepage according to claim 1 is characterized in that the dam model medium in the described casing (3) is sand or soil or rock or their mixture.
7. a kind of analogue means based on the distributed optical fiber sensing monitoring dam seepage according to claim 1 is characterized in that described sensing optic cable (11) be arranged in parallel several sections in casing.
8. a kind of analogue means based on the distributed optical fiber sensing monitoring dam seepage according to claim 1 is characterized in that described analogue means can expand to the analogue means of two covers and the above same structure of two covers.
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| CNB2006100322585A CN100430557C (en) | 2006-09-18 | 2006-09-18 | Distributed optical fiber sensing monitoring based dam seepage analog apparatus |
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| CNB2006100322585A CN100430557C (en) | 2006-09-18 | 2006-09-18 | Distributed optical fiber sensing monitoring based dam seepage analog apparatus |
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