CN203213068U - Earth-rock dam for piping dam break simulating test - Google Patents
Earth-rock dam for piping dam break simulating test Download PDFInfo
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- CN203213068U CN203213068U CN 201320128191 CN201320128191U CN203213068U CN 203213068 U CN203213068 U CN 203213068U CN 201320128191 CN201320128191 CN 201320128191 CN 201320128191 U CN201320128191 U CN 201320128191U CN 203213068 U CN203213068 U CN 203213068U
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Abstract
The utility model relates to a earth-rock dam for a piping dam break simulating test, and the earth-rock dam comprises a dam body, wherein the dam body is mainly built through earth-rock materials; a weak layer capable of generating a piping channel is paved on the position, which is set according to test requirements, of the dam body; the weak layer is internally provided with a water pipe which penetrates through the dam body; the wall of the water pipe is provided with through holes which are distributed at intervals along the axial direction of the water pipe; the water pipe positioned on the upstream end of the dam body is provided with a valve. According to the utility model, the weak layer can be scoured in such a way that water is injected into the water pipe during the test, so that the formation of the piping channel inside the dam body is simulated and accelerated; field test failure and even unpredictable sudden dam break event generation which are caused because the formation time of the piping channel can not be controlled during the test are prevented from causing life and property loss by controlling the lasting time of a field piping test.
Description
Technical field
The utility model relates to a kind of earth and rockfill dam, is specifically related to a kind of earth and rockfill dam of using in simulation piping dam break test.
Background technology
China has built more than 8.8 ten thousand of reservoir dam, and more than 640 ten thousand of small-sized dykes wherein are earth and rockfill dam more than 90%.These reservoir constructions are of the remote past, and many all is that local peasant is self-built, and series of hydrological is short, and flood control by reservoir regulation storage capacity and flood carrying capacity are underestimated, and many reservoir designs and construction standard are low, in case dam-break accident takes place, will bring serious disaster to the downstream.According to statistics, piping dam break ratio is the one of the main reasons of earth and rockfill dam dam break up to 29% in the earth and rockfill dam dam break event.
Yet because the inside that the earth and rockfill dam piping process of bursting is accompanied by the piping passage washes away, inner passage complex process such as cave in, the process of bursting has strong nonlinearity, non-constancy, and the course prediction that bursts of piping so far is still very difficult.For the dam body that cohesionless material is constructed, because the dam break current mostly are non-constant rapidly avried flow, the governing equation of inviscid silt migration washes away in the process inapplicable in piping inside.And the dam body of constructing for cohesive material, because cohesive soil silt migration theory is still immature, therefore, current physics scale model is difficult to obtain the rational piping process of bursting.In other words, the laboratory test of carrying out so far can't well solve the guide problem mostly, and indoor piping dam break test result is mostly to be achievements qualitatively, and the non-quantitation achievement.Carry out on-the-spot large scale piping dam break test and be so far research method the most reliably.
Because on-the-spot large scale test relates to reservoir, use in place, flood flowing district, downstream, problems such as reservoir water source supply, each on-the-spot large scale dam break test funds are huge, guarantee that it is the earth and rockfill dam piping process field trial key of success of bursting that the piping process of bursting fully develops (incipient piping passage-passage widens-downstream dam slope and dam crest sink-burst).
Therefore, if can propose a kind of after piping dam break on-test, can form piping passage and the final test earth and rockfill dam that the piping dam break takes place, so to improving the on-the-spot piping success of the test of large scale rate, grasp earth and rockfill dam piping dam break mechanism and have significant values, also have great importance to promoting China's dam break hydraulics discipline development.
The utility model content
The technical problems to be solved in the utility model is: propose a kind ofly after piping dam break on-test, can stablize and form piping passage and the final test earth and rockfill dam that the piping dam break takes place.
The utility model is that the technical scheme that solves the problems of the technologies described above proposition is: a kind of earth and rockfill dam for simulation piping dam break test, comprise the dam body that is mainly built up by native stone bank, it is characterized in that: in described dam body, lay the weak floor that can produce the piping passage according to the test requirements document setting position, be provided with the water pipe that runs through described dam body in the described weak floor, tube wall at described water pipe has along its axial direction through hole spaced apart, and the upstream extremity that described water pipe is positioned at described dam body is provided with valve.
The beneficial effects of the utility model are:
The utility model is provided with weak floor and water pipe is set in weak floor by sending out living piping place in the dam body inside of earth and rockfill dam.At the trial, can be by water filling form the washing away of weak floor to water pipe, thus simulation and accelerate the formation of the inner piping passage of dam body.Can effectively avoid after the earth and rockfill dam in using the utility model when the on-the-spot piping of earth and rockfill dam is tested, can't forming the steady seepage passage, can't form the risk of piping dam break, improve the success of the test rate, guarantee that test data is complete; And can control field pipes and gush test time of carrying out, avoid in the test piping passage formation time uncontrollable, and then cause the field trial failure, even cause occurring the sudden dam break event that is difficult to expect, cause life and property loss.
Having improved of technique scheme:
Even in order to guarantee current, prevent that the local water outlet of piping passage internal cause is smooth and cause passage to stop up that cause test failure, the through hole gross area on the described water pipe tube wall and the ratio of described water pipe cross sectional area are less than 1; In addition, for guaranteeing through hole enough water yields are arranged, the ratio of the through hole gross area and described water pipe cross sectional area is greater than 0.5.
In order to increase piping in-channel water stream osmotic pressure, guarantee that the piping passage forms, described water pipe is positioned at the downstream sealing of described dam body.
For anti-antipriming pipe to go out water flow velocity inhomogeneous, the elevation of the upstream extremity of described water pipe is greater than the elevation of the downstream of described water pipe, described water pipe is spent greater than 0 degree and less than 7 with the angle that horizontal plane forms.
In order to be conducive to form the piping passage, described weak floor is mainly laid by fine sand or medium sand and is formed, and the thickness of described weak floor is greater than 0.6m, and width is greater than 1.5m.
Enter the piping passage for avoiding taking place water from the upstream side of weak floor, interference test is carried out, described weak floor is provided with the clay blanket that thickness is 0.5m at the domatic water line upstream end place of the upstream side of described dam body, and the covering layer scope is greater than upstream dam slope side weak floor scope.
Description of drawings
Below in conjunction with accompanying drawing the earth and rockfill dam for simulation piping dam break test of the present utility model is described further.
Fig. 1 is the transverse cross-sectional view that is used for the earth and rockfill dam of simulation piping dam break test in the utility model.
Fig. 2 is the longitudinal sectional drawing that is used for the earth and rockfill dam of simulation piping dam break test in the utility model.
Fig. 3 is the enlarged drawing of A portion among Fig. 1.
Fig. 4 is the structural representation of water pipe in the utility model.
The specific embodiment
Embodiment one
According to Fig. 1, Fig. 2 and shown in Figure 3, the utility model comprises dam body 1.Dam body 1 is mainly built at dam foundation heap by native stone material and is formed, and the elevation at dam body 1 top is 8m, water level 7.6m on the dam.
In testing program, the default position of piping passage that occurs is in the 1m eminence of the relative dam foundation.Therefore the position high apart from dam foundation 1m in dam body 1 is equipped with the material-paving that the main weak floor 2(that is made of sand can certainly adopt other easily to run off under the souring of current), the degree of depth of weak floor 2 is 0.6m, width is 1.5m, and sand selects the fine sand between the fineness modulus 2.2-1.6.
In weak floor 2, the water pipe 3 that to be embedded with a diameter be 30cm, water pipe 3 runs through dam body 1 along the upstream and downstream direction of dam body 1.
The elevation of the upstream extremity of water pipe 3 is greater than the elevation of the downstream of described water pipe, and water pipe 3 should be 1 degree in the present embodiment greater than 0 degree and less than 7 degree with the angle that horizontal plane forms.
Valve 4 sealings are adopted in the sealing of water pipe 3 downstream, upstream extremity, must open at any time.
Enter the piping passage for avoiding taking place water from the upstream side of weak floor 2, interference test is carried out, and weak floor arranges the clay blanket 5 that thickness is 0.5m in domatic exit, dam body upstream, and the covering layer height is 1m, width is 2.2m, and the covering layer scope is greater than upstream dam slope side weak floor scope.
As shown in Figure 4, have on the body of water pipe 3 along its axial direction through hole 6 spaced apart, through hole 6 gross areas on water pipe 3 tube walls and the ratio of described water pipe 3 cross sectional areas are 0.9 in the present embodiment greater than 0.5 and less than 1.
Embodiment two
According to Fig. 1, Fig. 2 and shown in Figure 3, the utility model comprises dam body 1.Dam body 1 is mainly built at dam foundation heap by native stone material and is formed, and the elevation at dam body 1 top is 8m, water level 7.6m on the dam.
In testing program, the default position of piping passage that occurs is in the 1m eminence of the relative dam foundation.Therefore the position high apart from dam foundation 1m is equipped with the material-paving that the main weak floor 2(that is made of sand can certainly adopt other easily to run off under the souring of current in dam body 1), the degree of depth of weak floor 2 is 0.6m, width is 1.5m, and sand selects the fine sand between the fineness modulus 2.2-1.6.
In weak floor 2, the water pipe 3 that to be embedded with a diameter be 20cm, water pipe 3 runs through dam body 1 along the upstream and downstream direction of dam body 1.
The level height value of the upstream extremity of water pipe 3 is greater than the level height value of the downstream of described water pipe, and water pipe 3 should be 6 degree in the present embodiment greater than 0 degree and less than 7 degree with the angle that horizontal plane forms.
Valve 4 sealings are adopted in the sealing of water pipe 3 downstream, upstream extremity, must open at any time.
Enter the piping passage for avoiding taking place water from the upstream side of weak floor 2, interference test is carried out, and weak floor arranges the clay blanket 5 that thickness is 0.5m in domatic exit, dam body upstream, the covering layer height is 1m, and width is 2.2m, and the covering layer scope is greater than upstream dam slope side weak floor scope.As shown in Figure 4, have on the body of water pipe along its axial direction through hole 6 spaced apart, through hole 6 gross areas on water pipe 3 tube walls and the ratio of described water pipe 3 cross sectional areas are 0.8 in the present embodiment greater than 0.5 and less than 1.
The above-described embodiment that is not limited to of the present utility model, all employings are equal to replaces the technical scheme that forms, and all drops in the protection domain of the utility model requirement.
Claims (6)
1. one kind is used for the earth and rockfill dam that simulation piping dam break is tested, comprise the dam body that is mainly built up by native stone bank, it is characterized in that: be equipped with the weak floor that can produce the piping passage at described dam body according to the test requirements document setting position, be provided with the water pipe that runs through described dam body in the described weak floor, tube wall at described water pipe has along its axial direction through hole spaced apart, and the upstream extremity that described water pipe is positioned at described dam body is provided with valve.
2. according to the described earth and rockfill dam for simulation piping dam break test of claim 1, it is characterized in that: the through hole gross area on the described water pipe tube wall and the ratio of described water pipe cross sectional area are greater than 0.5 and less than 1.
3. according to the described earth and rockfill dam for simulation piping dam break test of claim 1, it is characterized in that: described water pipe is positioned at the downstream sealing of described dam body.
4. according to the described earth and rockfill dam for simulation piping dam break test of claim 1, it is characterized in that: the elevation of the upstream extremity of described water pipe is greater than the elevation of the downstream of described water pipe, and the angle that described water pipe and horizontal plane form is greater than 0 degree and less than 7 degree.
5. according to the arbitrary described earth and rockfill dam for simulation piping dam break test of claim 1-4, it is characterized in that: described weak floor is mainly laid by fine sand or medium sand and is formed, and the thickness of described weak floor is greater than 0.6m, and width is greater than 1.5m.
6. according to the arbitrary described earth and rockfill dam for simulation piping dam break test of claim 1-4, it is characterized in that: described weak floor is provided with the clay blanket that thickness is 0.5m at the domatic water line upstream end position of the upstream side of described dam body place, and the covering layer scope is greater than upstream dam slope side weak floor scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320128191 CN203213068U (en) | 2013-03-20 | 2013-03-20 | Earth-rock dam for piping dam break simulating test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320128191 CN203213068U (en) | 2013-03-20 | 2013-03-20 | Earth-rock dam for piping dam break simulating test |
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| CN203213068U true CN203213068U (en) | 2013-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320128191 Withdrawn - After Issue CN203213068U (en) | 2013-03-20 | 2013-03-20 | Earth-rock dam for piping dam break simulating test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114552A (en) * | 2013-03-20 | 2013-05-22 | 水利部交通运输部国家能源局南京水利科学研究院 | Earth and rockfill dam for simulating piping dam break test |
| CN109163877A (en) * | 2018-07-12 | 2019-01-08 | 水利部交通运输部国家能源局南京水利科学研究院 | The large scale field test simulator of sub-bottom changes piping dangerous situation |
-
2013
- 2013-03-20 CN CN 201320128191 patent/CN203213068U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114552A (en) * | 2013-03-20 | 2013-05-22 | 水利部交通运输部国家能源局南京水利科学研究院 | Earth and rockfill dam for simulating piping dam break test |
| CN109163877A (en) * | 2018-07-12 | 2019-01-08 | 水利部交通运输部国家能源局南京水利科学研究院 | The large scale field test simulator of sub-bottom changes piping dangerous situation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130925 Effective date of abandoning: 20150204 |
|
| RGAV | Abandon patent right to avoid regrant |