CN104374645A - Mechanical dynamic tester for flexible impervious body joint structure and testing method - Google Patents
Mechanical dynamic tester for flexible impervious body joint structure and testing method Download PDFInfo
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- CN104374645A CN104374645A CN201410687174.XA CN201410687174A CN104374645A CN 104374645 A CN104374645 A CN 104374645A CN 201410687174 A CN201410687174 A CN 201410687174A CN 104374645 A CN104374645 A CN 104374645A
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Abstract
The invention discloses a mechanical dynamic tester for a flexible impervious joint structure and a testing method. aiming at the problems that after a face film or a panel impervious structure of a high rock-fill dam runs for a long time with water storage, the part anchored by a conventional impervious film at the periphery of the upstream face of a dam body under certain depth or the flexible water-stopping structure at the peripheral joint of the panel easily has damage phenomenon. The mechanical dynamic tester and the testing method can simulate the deformation damage of the face film and the panel impervious structure under different upper and lower contact materials on site. The mechanical dynamic tester group of the flexible impervious joint structure mainly comprises a high-pressure container (pressure chamber), a water charge and discharge (gas) pipe valve system, a mechanical dynamic and test specimen installation platform system, and a displacement and pressure measurement feedback control system and a monitoring system. The damage mechanism at the anchoring joint part at the periphery of an impervious body of a high face membrane rock-fill dam at a certain water depth can be disclosed by the test.
Description
Technical field
The present invention relates to flexible barrier body seam construction mechanical dynamic test apparatus and test method thereof, belong to high facial mask rock-fill dams film leakage preventing structure technical field.
Background technology
What the reservoir dam in water resources development and utilization adopted earth rock material to build a dam account for most of ratio, although wherein major part belongs to middle weir, dam the highest is in the world earth and rockfill dam.Impervious body in high rock-fill dams mainly adopts cohesive soil core-wall or reinforced concrete panel, and for dam site ground be comparatively deeply covered layer time, clay core-wall (or sloping core) can only be adopted to connect the pattern of ground concrete cut.High clay core wall rockfill dam need gather clay near dam site, and cost of not only taking over the land for use is high, and causes surface vegetation to destroy, influence ecological environment.The flexible barrier body adopting polymer membrane to become can replace cohesive soil, incomplete statistics, has at least 167 earth and rockfill dams to adopt film antiseepage to the whole world in 2010.For higher facial mask rock-fill dams, after dam body is subject to deadweight and effect of water pressure, rockfill materials will produce the displacement deformation of maximal phase for height of dam 0.5% ~ 1%, the film be laid on dam facing will with dam body displacement, and the peripheral anchor of film is on almost indeformable rock mass or concrete bodies, distortion dam body and almost between indeformable rock mass relative to a seam, film is made to produce relatively large stretcher strain in the yardstick that the intersection of rock mass or concrete bodies and Earth-rockfill Dam is very little, due to the constraint at the upper and lower contact material interface of film, the very large extensibility that film self has also is difficult to play a role, very easily destroy in the seam areas of dam facing and rock mass, be called for short " seam crossing destruction " herein.
It is relevant that head, the interfacial characteristics of this place's dam deformation amount, film and upper and lower contact material and film own physical mechanical characteristic bear in " seam crossing destruction " and this place, and along with the increase of head during reservoir just retaining, the stretcher strain of film is a dynamic process.How to disclose the mechanism of " seam crossing destruction " and be applied to engineering practice, need to develop a kind of can bearing investigated seam crossing head, the interfacial characteristics of this place's dam deformation amount, film and upper and lower contact material and film own physical mechanical characteristic and can simulate the test apparatus of dynamic process as variable, develop corresponding test method simultaneously.The present invention's " a kind of flexible barrier body seam machinery dynamic tester and test method " will make to realize above-mentioned proposition becomes possibility.
Summary of the invention
The present invention is directed to high facial mask rock-fill dams peripheral seam structure very easily to destroy but lack analysis means and method and propose a kind of flexible barrier body seam machinery dynamic tester and test method.
A kind of flexible barrier body seam construction mechanical dynamic test instrument, comprise pressure chamber and Inlet and outlet water (gas) system of pipe and valve, machine power and specimen mounting platform system, displacement and pressure measurement feedback control system and surveillance, it is characterized in that above-mentioned pressure chamber and Inlet and outlet water (gas) system of pipe and valve, machine power and specimen mounting platform system, displacement and pressure measurement feedback control system three systems form by sensor, chip and software the total system that process of the test controls voluntarily;
Described pressure chamber and Inlet and outlet water (gas) system of pipe and valve are made up of upper and lower two pressure vessels, inlet and outlet pipe and operation valves, and upper and lower pressure vessel is connected by ring flange;
Described machine power and specimen mounting platform system are made up of the servomotor bottom downforce room, leading screw, specimen mounting platform, and be connected by leading screw between specimen mounting platform with servomotor, speed control moves up and down; Specimen mounting platform is disc, and place bed course and antiseepage film sample in disk, antiseepage film realizes periphery by ring flange and fixes;
Described displacement and pressure measurement feedback control system are made up of displacement and pressure transducer, feedback controller.
Described upper and lower pressure vessel internal diameter is 500mm, design pressure 2.2MPa, high 250mm in upward pressure container, high 5500mm in downforce container.
Described specimen mounting platform external diameter 499mm, platform edges arranges the ring of wall thickness 2mm height 60mm.
Described surveillance is made up of underwater camera device.
The test method of described flexible barrier body seam construction mechanical dynamic test instrument, key step is:
(1) first specimen mounting platform is adjusted to reference position, loaded by course in specimen mounting platform disk, then be arranged on above bed course by flexible barrier body and protective seam thereof, the edge of impervious body flushes with the edge of the ring flange of downforce room; The ring flange covered upward pressure room, on the ring flange of lower container, tightens ring flange.
(2) open venthole and the water inlet pipe at top, upward pressure room, make water be full of upper container, and reach gradually
Test design hydraulic pressure force value.
(3) treat that force value after a period of stabilisation, start displacement and pressure measurement feedback control system, make examination
Sample mounting platform declines slowly, opens upward pressure room water inlet pipe simultaneously and is continuously applied water pressure, by automatically controlling the speed that Coordination Platform declines and upward pressure room water-filling pressurizes, within making water pressure remain positive and negative 5% of test design value.
(4) in platform decline process, real-time auto-measuring and record platform decline displacement; Underwater camera
Device shows in real time and records flexible barrier body and declines with platform and deform and the situation (whether relative displacement occurring between flexible barrier body and bed course) of bed course, until flexible barrier body destroys, upward pressure indoor water pressure declines rapidly, all system closings, off-test.
Technique effect:
Flexible barrier body seam construction mechanical dynamic test instrument can the deformation process of flexible barrier body peripheral anchor seam crossing impervious body in Dam body displacement process of falseface membrane stack masonry dam and state completely, and its outstanding superiority is:
(1) under water pressure remains the condition within positive and negative 5% of test design value, drive specimen mounting platform to move down by servomotor and leading screw by displacement and pressure measurement feedback control system, simulate reservoir filling completely to Dam body displacement mode during a certain water level;
(2) on sample, water pressure is applied, overcome the test of existing model casing on sample, to apply pressure by hydraulic pressurization plate and can not produce the technical barrier of friction resistance by Simulated Water pressure between sample and permeable protective seam, make test result and the actual goodness of fit of engineering produce the lifting of matter;
(3) can not only acquisition test data automatically, and observe sample deformation in pressure vessel by unerwater-surveillance system until the overall process destroyed.
(4) blank of flexible barrier body seam construction mechanical dynamic test instrument and this research field of test method thereof, has originality.
Accompanying drawing explanation
Fig. 1 is flexible barrier body seam construction mechanical dynamic test instrument schematic diagram.
In figure 1. The pressure chamber (2) under pressure chamber top flange (3) under the seal of the screw drive power plant 4. Helical screw and sheath 5. Sample installation platform (disc) 6. The platform operation control system (including water pressure chamber pressure feedback) 7. Pressure chamber on 8. On the bottom of the pressure chamber flange 9. Pressure chamber on the feed line 10. The pressure chamber inlet pipe valve (automatic or manual) 11. Pressure on the chamber inlet pipe pressure sensor (or pressure) 12. Pressure on the chamber inlet pipe flowmeter 13. 14. Pressure chamber on the outlet pipe pressure chamber on the outlet pipe valve (automatic or manual) 15. The pressure chamber outlet pipe pressure sensor (or pressure) 16. On top of the pressure chamber exhaust pipe 17. Pressure chamber on the exhaust valve 18. 19 platform displacement measurement system. The underwater lighting camera device, exhaust pressure chamber and a drain under 21. The exhaust pressure chamber and a drain valve under 22. Stent 23. Control the computer.
Embodiment
A kind of flexible barrier body seam construction mechanical dynamic test instrument, comprise pressure chamber 7 and 1 and Inlet and outlet water (gas) pipe 9, 13, 16 and 20 valves 10, 14, 17 and 21 systems, machine power 3 and specimen mounting platform 5 system, displacement 18 and pressure measurement 11 and 15 feedback control system 23 and surveillance 19, it is characterized in that above-mentioned pressure chamber 7 and 1 and Inlet and outlet water (gas) pipe 9, 13, 16 and 20 valves 10, 14, 17 and 21 systems, machine power 3 and specimen mounting platform 5 system, displacement 18 and pressure measurement 11 and 15 feedback control system 6 and 23 3 systems pass through sensor, chip and software form the total system that process of the test controls voluntarily, pressure chamber 7 and 1 and Inlet and outlet water (gas) pipe 9,13,16 and 20 valve 10,14,17 and 21 system are made up of upper 7, lower 1 two pressure vessels, inlet and outlet pipe 9,13,16 and 20 and operation valve 10,14,17 and 21, and upper and lower pressure vessel 7 and 1 is connected with 2 by ring flange 8, machine power and specimen mounting platform system are made up of the servomotor 3 bottom downforce room 1, leading screw 4, specimen mounting platform 5, and be connected by leading screw 4 between specimen mounting platform 5 with servomotor 3, speed control moves up and down, specimen mounting platform 5 is in disc, and place bed course and antiseepage film sample in disk, antiseepage film realizes periphery by ring flange 8 and 2 and fixes, displacement and pressure measurement feedback control system are made up of displacement and pressure transducer 18,11 and 15, feedback controller 6 and 23.Upper and lower pressure vessel 7 and 1 internal diameter is 500mm, design pressure 2.2MPa, high 250mm in upward pressure container 7, high 5500mm in downforce container 1.
Specimen mounting platform 5 external diameter 499mm, platform edges arranges the ring of wall thickness 2mm height 60mm.
The sealing servomotor (propulsion system) 3 that top connects screw 4 is arranged on bottom downforce room 1, and leading screw 4 is provided with water-proof jacket outside middle and lower part, all can prevent sample from destroying hourglass water intrusion device inner; Leading screw 4 top connects specimen mounting platform 5, because the external diameter of movable mounting platform 5 only differs 1mm with downforce room 1 internal diameter, so need accurate installation; By displacement 18, pressure 11 and 15 sensor, water inlet control valve 10 and, data collecting instrument 6, servomotor 3 and leading screw 4, control chip and software forms displacement and pressure measurement feedback control system, this is the most crucial system of test instrument; Underwater lighting, underwater camera and monitor 19 form real-time unerwater-surveillance system.
The test method of above-mentioned flexible barrier body seam construction mechanical dynamic test instrument:
The flexible barrier body (outer edge area is decorated with the concentric circles of different colours, radius) of test design and top and bottom bed course thereof to be installed in Fig. 1 on 5. Platform and module; Start 3. leading screw propulsion system and 6. platform operation control systems, stop when the flexible barrier body at disk top is flushed with 2. ring flange tops, downforce room; Flexible barrier body is laid on 2. downforce room top flange dishes, by 7. upward pressure chamber caps, then tightens closed for upper lower flange; Open 16. upward pressure room top vent pipes and 10. upward pressure room water inlet pipe operation valves, close 14. upward pressure room rising pipe operation valves, upward pressure indoor water-filling slowly, until force value reaches test design value; Open 21. downforce and put room exhaust outlet pipe operation valve; Start 6. platform operation control systems, platform is slowly declined under the condition keeping upward pressure room water pressure basicly stable, along with platform declines slowly, flexible barrier body is in the constraint lower edge generation stretcher strain of upper underlayer, and distortion increases until destroy; The water of the upward pressure room after flexible barrier body destroys is discharged by 20. exhaust outlet pipes; In platform decline process, by the deflection of 18. platform displacement measurement system measurement platform, show the deformation process of flexible barrier body and the condition of upper underlayer by 19. underwater photographic systems; The effect of contraction at bed course interface is analyzed by the concentric circles observing flexible barrier body outer edge area; The limit of stretch elongation to the flexible barrier body that should bear head is determined by the measuring value of platform deflection.
When adopt comparatively small test hydraulic pressure force value time, bed course is very little or not yet produce for the constraint of flexible barrier body, and now, even if deflection when platform reaches above-mentioned high pressure values equally, flexible barrier body then not necessarily destroys.Can determine that this makes certain flexible barrier body between certain bed course that the critical hydraulic pressure force value destroyed occur in test instrument by test.
Claims (5)
1. a flexible barrier body seam construction mechanical dynamic test instrument, comprise pressure chamber and Inlet and outlet water (gas) system of pipe and valve, machine power and specimen mounting platform system, displacement and pressure measurement feedback control system and surveillance, it is characterized in that above-mentioned pressure chamber and Inlet and outlet water (gas) system of pipe and valve, machine power and specimen mounting platform system, displacement and pressure measurement feedback control system three systems form by sensor, chip and software the total system that process of the test controls voluntarily;
Described pressure chamber and Inlet and outlet water (gas) system of pipe and valve are made up of upper and lower two pressure vessels, inlet and outlet pipe and operation valves, and upper and lower pressure vessel is connected by ring flange;
Described machine power and specimen mounting platform system are made up of the servomotor bottom downforce room, leading screw, specimen mounting platform, and be connected by leading screw between specimen mounting platform with servomotor, speed control moves up and down; Specimen mounting platform is disc, and place bed course and antiseepage film sample in disk, antiseepage film realizes periphery by ring flange and fixes;
Described displacement and pressure measurement feedback control system are made up of displacement and pressure transducer, feedback controller.
2. flexible barrier body seam construction mechanical dynamic test instrument according to claim 1, is characterized in that described upper and lower pressure vessel internal diameter is 500mm, design pressure 2.2MPa, high 250mm in upward pressure container, high 5500mm in downforce container.
3. flexible barrier body seam construction mechanical dynamic test instrument according to claim 1, is characterized in that described specimen mounting platform external diameter 499mm, and platform edges arranges the ring of wall thickness 2mm height 60mm.
4. flexible barrier body seam construction mechanical dynamic test instrument according to claim 1, is characterized in that described surveillance is made up of underwater camera device.
5. the test method of a kind of flexible barrier body seam construction mechanical dynamic test instrument according to claim 1, key step is:
(1) first specimen mounting platform is adjusted to reference position, loaded by course in specimen mounting platform disk, then be arranged on above bed course by flexible barrier body and protective seam thereof, the edge of impervious body flushes with the edge of the ring flange of downforce room; The ring flange covered upward pressure room, on the ring flange of lower container, tightens ring flange;
(2) open venthole and the water inlet pipe at top, upward pressure room, make water be full of upper container, and reach gradually
Test design hydraulic pressure force value;
(3) treat that force value after a period of stabilisation, start displacement and pressure measurement feedback control system, make examination
Sample mounting platform declines slowly, opens upward pressure room water inlet pipe simultaneously and is continuously applied water pressure, by automatically controlling the speed that Coordination Platform declines and upward pressure room water-filling pressurizes, within making water pressure remain positive and negative 5% of test design value;
(4) in platform decline process, real-time measurement and record platform decline displacement; Underwater camera device
Real-time display is also recorded flexible barrier body and is declined with platform and deform and the situation of bed course, until flexible barrier body destroys.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106018109A (en) * | 2016-06-29 | 2016-10-12 | 济南大学 | Continuous stable pressurization type geomembrane liquid expansion deformation mechanical testing device |
| CN106323754A (en) * | 2016-08-08 | 2017-01-11 | 东北石油大学 | Experiment table used in remote online nondestructive testing comprehensive experiment device |
| CN107655760A (en) * | 2017-09-28 | 2018-02-02 | 水利部交通运输部国家能源局南京水利科学研究院 | Geomembrane bursting simulation test device and test method on particle bed course |
| CN108007762A (en) * | 2017-11-30 | 2018-05-08 | 河海大学 | Multifunction test instrument and test method for high rock-fill dams facial mask chucking effect |
| CN110954674A (en) * | 2019-12-02 | 2020-04-03 | 中国海洋大学 | Static sounding indoor simulation test device |
| CN112885205A (en) * | 2021-02-05 | 2021-06-01 | 浙江工业大学 | Internal pressure experiment platform |
| CN113640210A (en) * | 2021-06-29 | 2021-11-12 | 华北水利水电大学 | Testing device for deformation capability of geomembrane seepage prevention structure adapting to dam body or dam foundation |
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Cited By (12)
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| CN106018109A (en) * | 2016-06-29 | 2016-10-12 | 济南大学 | Continuous stable pressurization type geomembrane liquid expansion deformation mechanical testing device |
| CN106018109B (en) * | 2016-06-29 | 2019-05-03 | 济南大学 | A kind of continual and steady adding pressure type geotechnique film liquid bulging deformation mechanical testing equipment |
| CN106323754A (en) * | 2016-08-08 | 2017-01-11 | 东北石油大学 | Experiment table used in remote online nondestructive testing comprehensive experiment device |
| CN106323754B (en) * | 2016-08-08 | 2018-10-12 | 东北石油大学 | The experimental bench used in remote online non-destructive testing comprehensive experimental device |
| CN107655760A (en) * | 2017-09-28 | 2018-02-02 | 水利部交通运输部国家能源局南京水利科学研究院 | Geomembrane bursting simulation test device and test method on particle bed course |
| CN107655760B (en) * | 2017-09-28 | 2020-04-03 | 水利部交通运输部国家能源局南京水利科学研究院 | Geomembrane bursting simulation test device and test method on particle cushion layer |
| CN108007762A (en) * | 2017-11-30 | 2018-05-08 | 河海大学 | Multifunction test instrument and test method for high rock-fill dams facial mask chucking effect |
| CN110954674A (en) * | 2019-12-02 | 2020-04-03 | 中国海洋大学 | Static sounding indoor simulation test device |
| CN110954674B (en) * | 2019-12-02 | 2023-08-29 | 中国海洋大学 | Indoor simulation test device for static sounding |
| CN112885205A (en) * | 2021-02-05 | 2021-06-01 | 浙江工业大学 | Internal pressure experiment platform |
| CN113640210A (en) * | 2021-06-29 | 2021-11-12 | 华北水利水电大学 | Testing device for deformation capability of geomembrane seepage prevention structure adapting to dam body or dam foundation |
| CN113640210B (en) * | 2021-06-29 | 2024-05-03 | 华北水利水电大学 | Device for testing deformation capacity of geomembrane impermeable structure adapted to dam body or dam foundation |
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