CN104280531A - Overburden pressure loading device applied to geotechnical vibration table test - Google Patents
Overburden pressure loading device applied to geotechnical vibration table test Download PDFInfo
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- CN104280531A CN104280531A CN201410561287.5A CN201410561287A CN104280531A CN 104280531 A CN104280531 A CN 104280531A CN 201410561287 A CN201410561287 A CN 201410561287A CN 104280531 A CN104280531 A CN 104280531A
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Abstract
The invention discloses an overburden pressure loading device applied to a geotechnical vibration table test. The overburden pressure loading device comprises a model box, an air bag, an air source and a pressing cover, wherein the air bag is arranged inside the model box and is connected with the air source by virtue of a pipeline; the pressing cover covers an opening of the model box and is fixedly connected with the wall of the model box. By virtue of the overburden pressure loading device applied to the geotechnical vibration table test, the depth of foundation soil researched in an existing vibration table test can be effectively expanded, and thus technical support is provided for deeply researching the dynamic characteristics of deep soil.
Description
Technical field
The present invention relates to a kind of equipment for geotechnological shaketalle test simulation soil body burden pressure, belong to test unit technical field.This equipment is specially adapted to simulation test soil body burden pressure in geotechnological shaketalle test and geotechnical centrifuge shaketalle test, not only can the base pressure of simulant building thing (structures), also can simulate the upper earthing body gravity stress that deep covering layer acts on.This device can simulate additional stress of soil or deep soil effective stress under the prerequisite not increasing shaking table load-bearing, for the soil body Dynamic Characteristics Test studied further under certain stress level provides important technical support.
Background technology
The site condition of in-situ test is completely true, its test findings is relatively reliable, but for problems such as explosion, Pollutants Diffusion, eaerthquake damages, because residing surrounding medium is complicated, heterogeneous many field interactions are strong, space-time span is large, it is larger to carry out on-the-spot overall process monitoring difficulty.By contrast, scale (model) test is when disclosing the mechanism of these processes, checking scientific theory and solving engineering technology problem, more flexible effective.
The shaking table model be used widely in Geotechnical Engineering earthquake research field has two classes: common shaketalle test (1g acceleration of gravity) and hydro-extractor shaketalle test (ng acceleration of gravity).Shaking table model can apply various forms of seismic event, in order to simulate the primary earthquake of some seismisms, principal earthquake and aftershock overall process, can understand and be familiar with response feature and the breakoff phenomenon of subjects in seismic process intuitively, become a kind of technical way of geotechnological earthquake research at present.Research contents has related to the force model response analysis of groundsill and foundation, the distortion of building liquefaction shock settlement, dykes and dams and side slope and estimation of stability, underground structure eaerthquake damage and floating, soil--all many-sides such as structural interaction, earthen structure earthquake response, liquefaction of soil mass, achieve plentiful and substantial scientific payoffs.
Be subject to the restriction of vibration table surface size and load-bearing capacity, the soil thickness of model ground is very limited, is generally no more than 2m.For the buildings that ground exists (structures), also or subjects is the darker soil body of buried depth, because in esse soil body burden pressure fails to obtain corresponding embodiment in test, be not inconsistent causing the initial stress state of the stress state of model ground and prototype ground.Therefore the model ground that the shaketalle test carried out under these conditions obtains and the earthquake response of works are difficult to reproduce truly actual prototype ground and the earthquake response of structure on it.
Site liquefaction evaluation and anti-liquefying treatment are the important topics in geotechnical earthquake engineering field always.Although shaketalle test can embody the anti-seismic performance of model preferably, actual stress state cannot be reflected by the test of model, therefore also there is larger dispute in the anti-seismic performance of the prototype structure calculated and foundation soil body.Therefore in process of the test, correct simulation prototype actual stress determines reliability and the authenticity of test findings, for evaluating actual prototype ground and on it, earthquake response of structure provides technical support.
Summary of the invention
The object of the invention is the defect overcoming prior art, a kind of geotechnological shaketalle test burden pressure charger is provided, for realizing the applying of soil body overlying burden in shaking table model, the stress level of the model soil body and the prototype soil body is matched, thus the foundation soil body realized under in-situ stress level or soil--the shaketalle test of structure Interaction Systems.
The technical scheme realizing the object of the invention is: geotechnological shaketalle test burden pressure charger, comprise model casing, described charger also comprises air bag, source of the gas and gland, described air bag is located in model casing, be connected with source of the gas by pipeline, described gland overlay model case mouth, and be fixedly connected with model tank wall.
As a further improvement on the present invention, be also provided with the upper and lower protective seam of horizontal-extending in described model casing, described air bag is located in the space between upper and lower protective seam.
As a further improvement on the present invention, described source of the gas is provided with tensimeter and pressure regulator valve.
As a further improvement on the present invention, with bolts between described gland and model casing.
Beneficial effect of the present invention is as follows:
1. device structure is simple.This device is processed by specialty, and realization supports the use with existing test model case;
2. air pressure-loading.Not only load-bearing is even for test soil sample, and for the larger operating mode of soil sample burden pressure, can reduce because material object loads the trouble brought, and then avoid because loading the impact of conducting oneself with dignity on test findings;
3. load mode simple and flexible.According to test model and condition, gas cylinder, air pump etc. can be selected as adding carrier gas source, accurately can be controlled size and the loading speed of gasbag pressure by pressure regulating valve device, guarantee that soil sample internal pressure is evenly transmitted, and inside air bag pressure size can be changed at any time according to testing requirements;
4. this equipment also can be used as the consolidation device in test sample making course.By controlling size and the loading speed of gasbag pressure, soil sample is made to complete effective consolidation.
This shaketalle test burden pressure charger can reach following technical indicator:
(1) pressure limit: 0 ~ 300kPa;
(2) model soil sample size: can according to testing requirements, the balloon size that processing and fabricating is supporting;
(3) soil body degree of depth is simulated: equipment can simulate the burden pressure of 0 ~ 50m buried depth soil body.
The present invention can effectively expand the degree of depth studying foundation soil body in existing shaketalle test, for the kinematic behavior furtheing investigate deep soil provides technical support.
Accompanying drawing explanation
Fig. 1 is the diagrammatic cross-section of the embodiment of the present invention 1;
Fig. 2 is the stressed schematic diagram of gland and model casing in the embodiment of the present invention 1.
Embodiment
Be described further below in conjunction with embodiment and accompanying drawing.
As shown in Figure 1; geotechnique's shaketalle test burden pressure charger 100; be made up of model casing 1, air bag 2, source of the gas 3 and gland 4; up-protective layer 8a and the lower protective layer 8b of horizontal-extending is also provided with in model casing 1; air bag 2 is located in the space that up-protective layer 8a and lower protective layer 8b surrounds; and be connected with source of the gas 3 by pipeline 5, gland 4 overlay model case mouth 11, and be fixedly connected with model tank wall 12.
Source of the gas 3 can select gas cylinder or air pump, and source of the gas 3 is with pressure regulator valve 6 and tensimeter 7, and gas is fed air bag 2 by pressure regulator valve 6 by source of the gas 3, and air pressure is applied to the surface of the test soil sample 9 in model casing 1 by air bag 2 in conjunction with gland 4.Size and the applying speed of air bag 2 pressure are controlled by pressure regulator valve 6, to meet testing requirements.
Adopt bolt 10 to be connected into entirety between gland 4 and model casing 1, air bag 2, by gland 4 equilibrium establishment between gasbag pressure and model casing internal force, makes gasbag pressure effectively can be delivered to test soil sample inner.The stressed schematic diagram of gland 4 and model casing 1 is shown in shown in accompanying drawing 2.
Claims (5)
1. geotechnological shaketalle test burden pressure charger, comprises model casing, it is characterized in that, described charger also comprises air bag, source of the gas and gland, and described air bag is located in model casing, is connected with source of the gas by pipeline, described gland overlay model case mouth, and be fixedly connected with model tank wall.
2. device according to claim 1, is characterized in that, be also provided with the upper and lower protective seam of horizontal-extending in described model casing, described air bag is located in the space between upper and lower protective seam.
3. device according to claim 1, is characterized in that, described source of the gas is provided with tensimeter and pressure regulator valve.
4. device according to claim 1, is characterized in that, with bolts between described gland and model casing.
5. device according to claim 1, is characterized in that, described source of the gas adopts gas cylinder or air pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410561287.5A CN104280531A (en) | 2014-10-21 | 2014-10-21 | Overburden pressure loading device applied to geotechnical vibration table test |
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| CN201410561287.5A CN104280531A (en) | 2014-10-21 | 2014-10-21 | Overburden pressure loading device applied to geotechnical vibration table test |
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| CN104280531A true CN104280531A (en) | 2015-01-14 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255704A (en) * | 2017-07-21 | 2017-10-17 | 石家庄铁道大学 | Rock slope with along layer near cut underground excavation model assay systems and test method |
| CN107271292A (en) * | 2017-08-14 | 2017-10-20 | 精功（绍兴）复合材料有限公司 | Product axial compression test tool device |
| CN108005669A (en) * | 2018-02-02 | 2018-05-08 | 中铁隧道局集团有限公司 | A kind of balancing earth-pressure shielding machine analogue experiment installation |
| CN108316933A (en) * | 2018-02-02 | 2018-07-24 | 中铁隧道局集团有限公司 | A kind of method that native case bankets in balancing earth-pressure shielding machine simulated experiment |
| CN108362577A (en) * | 2018-01-26 | 2018-08-03 | 中国电力科学研究院有限公司 | A kind of original position direct shear apparatus and its detection method |
| CN108374666A (en) * | 2018-03-13 | 2018-08-07 | 中铁隧道局集团有限公司 | The method that native case bankets in earth pressure balanced shield, EPBS identification of formation research experiment |
| CN114813001A (en) * | 2022-06-27 | 2022-07-29 | 中国飞机强度研究所 | Vibration fatigue test system and method for low additional stiffness of airplane |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255704A (en) * | 2017-07-21 | 2017-10-17 | 石家庄铁道大学 | Rock slope with along layer near cut underground excavation model assay systems and test method |
| CN107271292A (en) * | 2017-08-14 | 2017-10-20 | 精功（绍兴）复合材料有限公司 | Product axial compression test tool device |
| CN108362577A (en) * | 2018-01-26 | 2018-08-03 | 中国电力科学研究院有限公司 | A kind of original position direct shear apparatus and its detection method |
| CN108005669A (en) * | 2018-02-02 | 2018-05-08 | 中铁隧道局集团有限公司 | A kind of balancing earth-pressure shielding machine analogue experiment installation |
| CN108316933A (en) * | 2018-02-02 | 2018-07-24 | 中铁隧道局集团有限公司 | A kind of method that native case bankets in balancing earth-pressure shielding machine simulated experiment |
| CN108374666A (en) * | 2018-03-13 | 2018-08-07 | 中铁隧道局集团有限公司 | The method that native case bankets in earth pressure balanced shield, EPBS identification of formation research experiment |
| CN114813001A (en) * | 2022-06-27 | 2022-07-29 | 中国飞机强度研究所 | Vibration fatigue test system and method for low additional stiffness of airplane |
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Application publication date: 20150114 |