CN110258435A - A kind of true stress high earth and rockfill dam dynamic test method of hundred meter levels off field - Google Patents
A kind of true stress high earth and rockfill dam dynamic test method of hundred meter levels off field Download PDFInfo
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- CN110258435A CN110258435A CN201910552875.5A CN201910552875A CN110258435A CN 110258435 A CN110258435 A CN 110258435A CN 201910552875 A CN201910552875 A CN 201910552875A CN 110258435 A CN110258435 A CN 110258435A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
- E02B1/02—Hydraulic models
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/06—Earth-fill dams; Rock-fill dams
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The present invention provides a kind of true stress high earth and rockfill dam dynamic test methods of hundred meter levels off field, it include: using the maximum particle diameter of model box size permission as the upper limit, equivalent substitution oversize part determines model material gradation in proportion, layering is hit fills 100cm high model dam body in fact, it is controlled by design of dam body maximum dry density, is arranged at an equal altitude 5 acceleration transducers and displacement meter along height of dam in axis of dam position；Centrifugal acceleration is adjusted separately and carries out shaking table model for five stages, each experimental stage inputs 3 vibration frequency 2Hz, acceleration amplitude 0.3g, sine wave when holding under the corresponding centrifugal acceleration of 20s；By acceleration peak value under difference centrifugal acceleration at different elevations and sedimentation deformation is fitted using hyperbola and regression analysis, and matched curve is expanded to centrifugal acceleration 100g, obtains true stress and corresponds to 100m grades high earth and rockfill dam evaluation index off field.The present invention can quantitatively determine true stress 100m grades high earth and rockfill dam meets with macroseism off field dynamic response acceleration profile rule, amplitude and dam crest and shake the cores evaluation index such as sunken.
Description
Technical field
The invention belongs to earth and rockfill dam macroseism analogue technique fields, and in particular to a kind of true stress hundred meter level Gao Tushi off field
Dam dynamic test method.
Background technique
At this stage, the Disaster Data of 100m grades high earth and rockfill dam experience macroseism is still very limited.Ground large shake table model
Test is to study a kind of important means of 100m grades high earth and rockfill dam dynamic performance.It is answered by shock effect drag dam over the ground
The measurement of power and deformation, with the anti-stress for pushing away prototype dam of certain similarity relation and deformation.But ground large shaking table model
It can not simulate the true stress field of prototype, the ess-strain likelihood of model and prototype is not 1, and high earth and rockfill dam dam material
Intensity and deformation characteristic are closely related with stress and strain level, thus directly answer the result of ground vibration platform model test
For prototype Aseismic Design, there are certain uncertainties.And centrifuge shaking table model is rapidly developed in recent years
One new and high technology, be the high earth-rock works Seismic Problems of research more effectively and advanced research method and experimental technique,
In the research of high earth-rock works Seismic Problems using increasingly extensive.Especially in high earth and rockfill dam eaerthquake damage mechanism, numerical value point
Model verifying and strengthening measure for earthquake resistance verifying etc. are analysed, which shows huge superiority.
However, being limited by the centrifugation factors such as making machine vibration table moulded dimension and weight, 100m grades high earth and rockfill dam centrifuge vibration
Dynamic platform model test still needs to greatly than ruler reduced scale, and than the dam material dynamic characteristics after ruler reduced scale, there are larger with former dam material greatly
Difference, it is difficult to by the quantitative analysis of model test result and evaluate 100m grades high earth and rockfill dam acceleration profile rule, amplitude and dam
Top shakes the cores evaluation index such as sunken.Therefore, it is necessary to study a kind of true stress high earth and rockfill dam dynamic test sides of hundred meter levels off field
Method.
Summary of the invention
The object of the present invention is to provide a kind of true stress high earth and rockfill dam dynamic test methods of hundred meter levels off field, are guaranteeing mould
On the basis of type and prototype dam body stress and strain likelihood are 1, select to input identical earthquake under several centrifugal accelerations
It is dynamic to obtain the dynamic response characteristics on model dam, corresponding height of dam prototype dam can be obtained based on likelihood relationship (centrifugal acceleration)
Dynamic response characteristics establish centrifugal acceleration and different height of dam prototype dam body dynamic characteristics by regression analysis and curve matching
Inner link, matched curve, which is carried out extension, can quantitatively obtain true stress 100m grades of prototype dams (height of dam 100m) experiences off field
The dynamic response characteristics of macroseism.
The present invention provides a kind of true stress high earth and rockfill dam dynamic test methods of hundred meter levels off field, comprising the following steps:
Step 1, the maximum particle diameter allowed using model box size is the upper limit, and equivalent substitution oversize part determines model in proportion
Expect gradation, layering, which is hit, fills 100cm high model dam body in fact, controls by design of dam body maximum dry density, in axis of dam position Yan Ba
Height is arranged at an equal altitude 5 acceleration transducers and displacement meter；
Step 2, centrifugal acceleration is adjusted separately and carries out shake table mould for five stages of 10g, 20g, 30g, 40g and 50g
Type test, each experimental stage input 3 vibration frequency 2Hz, acceleration amplitude 0.3g, and the corresponding centrifugation of 20s adds when holding
Sine wave under speed；
Step 3, acceleration peak value under difference centrifugal acceleration at different elevations and sedimentation deformation are carried out using hyperbola
Fitting and regression analysis on this basis expand matched curve to centrifugal acceleration 100g, obtain true stress and correspond to off field
100m grades high earth and rockfill dam evaluation index；The evaluation index includes that acceleration profile rule, amplitude and dam crest shake are fallen into.
Further, this method further include:
After completing the step 1 to step 3, with the raising of moulded dimension and centrifugal acceleration, this method is directly answered
For 150m grades or more high earth and rockfill dam centrifuge shaking table model.
Compared with prior art the beneficial effects of the present invention are:
By existing centrifuge shaketalle test equipment and technology, true stress 100m grades of high earth and rockfill dams off field are quantitatively determined
Dynamic response acceleration profile rule, amplitude and the dam crest that (height of dam 100m) meets with macroseism shake the cores evaluation index such as sunken, have
Following advantage:
1, can guarantee that model dam and prototype dam stress and strain likelihood are 1, by existing centrifugation making machine vibration table technology with
True stress 100m grades high earth and rockfill dam (height of dam 100m) centrifuge shaking table model off field can be completed in equipment；
2, true stress 100m grades high earth and rockfill dam experience macroseism off field can be quantitatively determined by curve matching and regression analysis
Dynamic response acceleration profile rule, amplitude and dam crest shake the cores evaluation index such as fall into, add for dam body Aseismic Design and antidetonation
Gu the formulation of measure provides scientific basis；
3, existing dynamic calculation model can effectively be verified in the applicability and standard of 100m grades high earth and rockfill dam kinematic analysis
True property；
4, with the upgrading of centrifuge shaketalle test equipment, this method can be directly extended to 150m grades and the above water conservancy project
Building centrifuge shaking table model.
Detailed description of the invention
Fig. 1 is centrifuge shaking table model arrangement schematic diagram of the present invention；
Fig. 2 is stockpile grading curve figure；
Fig. 3 be under different centrifugal accelerations at the axis of dam dynamic response acceleration along height of dam distribution map；
Fig. 4 is different centrifugal acceleration dam crest peak accelerator distribution trends and matched curve figure；
Fig. 5 is that different centrifugal acceleration dam crests shake sunken amplitude distribution trend and matched curve figure.
Specific embodiment
The present invention is described in detail for each embodiment shown in reference to the accompanying drawing, but it should be stated that, these
Embodiment is not limitation of the present invention, those of ordinary skill in the art according to these embodiments made by function, method,
Or equivalent transformation or substitution in structure, all belong to the scope of protection of the present invention within.
The present embodiment by existing centrifuge shaketalle test equipment and technology, guarantee model dam and prototype dam stress and
On the basis of strain likelihood is 1, quantitatively determines the true stress dynamic response that 100m grades high earth and rockfill dam meets with macroseism off field and add
Speed distribution regularities, amplitude and dam crest shake the cores evaluation index such as sunken.
A kind of present invention, that is, true stress high earth and rockfill dam dynamic test method of hundred meter levels off field is guaranteeing model and prototype dam
On the basis of body stress and strain likelihood are 1, select several centrifugal accelerations and input identical earthquake motion to obtain model
The dynamic response characteristics on dam, the dynamic response that can be obtained different height of dam prototypes dam based on likelihood relationship (centrifugal acceleration) are special
Property, the inner link of centrifugal acceleration and different height of dam prototype dam body dynamic characteristics is established by regression analysis and curve matching,
Matched curve progress extension can quantitatively be obtained true stress, and 100m grades of prototype dams (height of dam 100m) meet with the dynamic of macroseism off field
The centrifuge shaking table model method of force-responsive characteristic.
Based on the above principles the method for the present invention the following steps are included:
A) maximum particle diameter allowed using model box size is the upper limit, and equivalent substitution oversize part determines model material grade in proportion
Match, layering, which is hit, fills 100cm high model dam body in fact, controls by design of dam body maximum dry density, in axis of dam position along height of dam etc.
Height 5 acceleration transducers of arrangement and displacement meter；
B) centrifugal acceleration is adjusted separately and carries out the examination of shake table model for five stages of 10g, 20g, 30g, 40g and 50g
It tests, each experimental stage inputs 3 vibration frequency 2Hz, acceleration amplitude 0.3g, the corresponding centrifugal acceleration of 20s when holding
Under sine wave；
C) acceleration peak value under difference centrifugal acceleration at different elevations and dam crest sedimentation deformation are carried out using hyperbola
Fitting and regression analysis, matched curve is expanded to centrifugal acceleration 100g, can be obtained true stress off field on this basis
Corresponding 100m grades high earth and rockfill dam acceleration profile rule, amplitude and dam crest shake the cores evaluation index such as sunken；After the completion of the above work,
With the raising of moulded dimension and centrifugal acceleration, this method can be directly applied to 150m grades or more high earth and rockfill dam centrifuge
Shaking table model.
Embodiment 1
Model arrangement schematic diagram is as shown in Figure 1.Dam material is granite stockpile, and model dam bottom width 200cm is high
100cm, upstream and downstream dam slope are 1:1.In figure, 1 is earth and rockfill dam；2 be acceleration transducer；3 be laser displacement sensor.
Fig. 2 solid line is that certain rock-fill dams stockpile designs grading curve.Using carrying out centrifuge after method reduced scale described in text
Shaking table model, maximum particle diameter 20mm, Fig. 2 dotted line are determining model test gradation.
When centrifugal acceleration rises to 10g, along river, to input-to-state stabilization, waveform is sine wave, frequency 20Hz, vibration
3 times, peak accelerator 4g, vibration lasts 2s every time；When centrifugal acceleration rises to 20g, along river to input-to-state stabilization, wave
Shape is sine wave, and frequency 40Hz vibrates 3 times, peak accelerator 8g, and vibration lasts 1s every time；Centrifugal acceleration rises to
When 30g, along suitable river to input-to-state stabilization, waveform is sine wave, and frequency 60Hz vibrates 3 times, and peak accelerator is respectively 12g,
Vibration lasts 2/3s every time；When centrifugal acceleration rises to 40g, along river, to input-to-state stabilization, waveform is sine wave, and frequency is
80Hz vibrates 3 times, and peak accelerator is respectively 16g, and vibration lasts 0.5s every time；When centrifugal acceleration rises to 50g, along suitable
To input-to-state stabilization, waveform is sine wave in river, and frequency 100Hz vibrates 3 times, and peak accelerator is respectively 20g, vibrates every time
Last 0.4s.
Along 5 acceleration transducers of height placement on the axis of dam, dam crest arranges that 1 settlement sensor, measurement dam are dynamic
Power reaction and seismic deformation.
Centrifuge shaking table model is carried out to the model dam, the axis of dam acceleration under different centrifugal accelerations is along dam
Height distribution, at the top of dam body acceleration peak value and permanent deformation amplitude as shown in Fig. 3, Fig. 4 and Fig. 5, result is analyzed by object mould it is found that
With the increase of centrifugal acceleration, model dam acceleration amplitude and dam crest sedimentation have good regularity, using multinomial into
After row fitting, dam crest peak accelerator and dam crest shake, which are fallen into curve progress extension, quantitatively to be obtained corresponding to 100m grades of Gao Tushi
The dynamic response acceleration amplitude and dam crest of Ba Moxingba (centrifugal acceleration 100g) settles, respectively 20.62m/s2With
80.2cm working well.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.
Claims (2)
1. a kind of true stress high earth and rockfill dam dynamic test method of hundred meter levels off field, which comprises the following steps:
Step 1, the maximum particle diameter allowed using model box size is the upper limit, and equivalent substitution oversize part determines model material grade in proportion
Match, layering, which is hit, fills 100cm high model dam body in fact, controls by design of dam body maximum dry density, in axis of dam position along height of dam etc.
Height 5 acceleration transducers of arrangement and displacement meter；
Step 2, centrifugal acceleration is adjusted separately and carries out the examination of shake table model for five stages of 10g, 20g, 30g, 40g and 50g
It tests, each experimental stage inputs 3 vibration frequency 2Hz, acceleration amplitude 0.3g, the corresponding centrifugal acceleration of 20s when holding
Under sine wave；
Step 3, acceleration peak value under difference centrifugal acceleration at different elevations and sedimentation deformation are fitted using hyperbola
And regression analysis, matched curve is expanded to centrifugal acceleration 100g on this basis, true stress is obtained and corresponds to 100m off field
The high earth and rockfill dam evaluation index of grade；The evaluation index includes that acceleration profile rule, amplitude and dam crest shake are fallen into.
2. the high earth and rockfill dam dynamic test method of hundred meter levels, feature exist a kind of true stress according to claim 1 off field
In, further includes:
After completing the step 1 to step 3, with the raising of moulded dimension and centrifugal acceleration, this method is directly applied to
150m grades or more high earth and rockfill dam centrifuge shaking table model.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910552875.5A CN110258435A (en) | 2019-06-25 | 2019-06-25 | A kind of true stress high earth and rockfill dam dynamic test method of hundred meter levels off field |
| AU2020100727A AU2020100727A4 (en) | 2019-06-25 | 2020-05-07 | Method For Dynamic Test Of 100 m-High Earth And Rockfill Dam Under Real Stress Field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910552875.5A CN110258435A (en) | 2019-06-25 | 2019-06-25 | A kind of true stress high earth and rockfill dam dynamic test method of hundred meter levels off field |
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| CN110258435A true CN110258435A (en) | 2019-09-20 |
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| AU (1) | AU2020100727A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115248303A (en) * | 2022-04-27 | 2022-10-28 | 中国电建集团贵阳勘测设计研究院有限公司 | 300 m-grade ultrahigh earth-rock dam core wall deformation centrifugal model test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111896204B (en) * | 2020-07-29 | 2024-10-08 | 中铁第四勘察设计院集团有限公司 | Model box for rock-soil model vibration test and design method thereof |
| CN113533130A (en) * | 2021-06-28 | 2021-10-22 | 南京仕达得尔智能科技有限公司 | Asphalt pavement compaction real-time monitoring method based on intelligent particles |
| CN114943170B (en) * | 2022-06-01 | 2024-06-14 | 大连理工大学 | Efficient ultra-deep overburden earth-rock dam diaphragm wall stress deformation refined analysis method |
| CN115201450B (en) * | 2022-06-23 | 2023-04-07 | 水利部交通运输部国家能源局南京水利科学研究院 | Prototype time and deformation calculation method for geotechnical centrifugal model test |
| CN115184461B (en) * | 2022-07-06 | 2023-06-02 | 水利部交通运输部国家能源局南京水利科学研究院 | Centrifugal test device and method for core wall dam break |
| CN115453656B (en) * | 2022-10-09 | 2024-08-13 | 安徽理工大学 | Correction method, device and equipment for earth-rock dam transient electromagnetic detection |
| CN116467903B (en) * | 2023-03-23 | 2024-06-21 | 中国电建集团成都勘测设计研究院有限公司 | Earthquake-resistant design method for medium-high earth-rock dam of deep cut river valley |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728436A (en) * | 2014-01-15 | 2014-04-16 | 水利部交通运输部国家能源局南京水利科学研究院 | Seismic dynamic centrifugal model test extension analysis method |
| CN107894311A (en) * | 2017-11-06 | 2018-04-10 | 中国水利水电科学研究院 | The model test method of earth and rockfill dam eaerthquake damage |
| CN108951721A (en) * | 2018-06-29 | 2018-12-07 | 江南大学 | A kind of method of strong rammer gangue ground dynamic stress |
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2019
- 2019-06-25 CN CN201910552875.5A patent/CN110258435A/en active Pending
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- 2020-05-07 AU AU2020100727A patent/AU2020100727A4/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728436A (en) * | 2014-01-15 | 2014-04-16 | 水利部交通运输部国家能源局南京水利科学研究院 | Seismic dynamic centrifugal model test extension analysis method |
| CN107894311A (en) * | 2017-11-06 | 2018-04-10 | 中国水利水电科学研究院 | The model test method of earth and rockfill dam eaerthquake damage |
| CN108951721A (en) * | 2018-06-29 | 2018-12-07 | 江南大学 | A kind of method of strong rammer gangue ground dynamic stress |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115248303A (en) * | 2022-04-27 | 2022-10-28 | 中国电建集团贵阳勘测设计研究院有限公司 | 300 m-grade ultrahigh earth-rock dam core wall deformation centrifugal model test method |
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| AU2020100727A4 (en) | 2020-06-18 |
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Application publication date: 20190920 |