CN202351119U - Physical model test device for soil piercing deformation of cut-off wall - Google Patents
Physical model test device for soil piercing deformation of cut-off wall Download PDFInfo
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- CN202351119U CN202351119U CN 201120469653 CN201120469653U CN202351119U CN 202351119 U CN202351119 U CN 202351119U CN 201120469653 CN201120469653 CN 201120469653 CN 201120469653 U CN201120469653 U CN 201120469653U CN 202351119 U CN202351119 U CN 202351119U
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Abstract
The utility model provides a physical model test device for the soil piercing deformation of a cut-off wall. The device comprises an organic glass tank and a cut-off wall model. The organic glass tank is used for containing a soil specimen. A certain space is reserved above the organic glass tank, and serves as an overburden pressure cavity in which an air bag is arranged. The bottom end of the diaphragm wall model is inserted into the soil specimen, and the top of the diaphragm wall model is connected with a pressure rod which is connected with a dial indicator. A pressure sensor which is connected with a reader through a conducting wire is buried into the soil at the bottom of the diaphragm wall model. The piercing displacement of the diaphragm wall model is realized through a triaxial test loading system, the air bag is used for pressurizing to simulate the layered filling of a dam, and the pressure sensor is used for measuring wall end pressure, so that the change rules of the wall end pressure under different overburden initial pressures along with the development of piercing deformation can be accurately obtained. The device is rational in design, simple in structure and convenient to operate, and the requirements of a physical model test in the soil piercing deformation of the diaphragm wall can be completely met.
Description
Technical field
The utility model relates to rock-soil mechanics soil and structural interaction analogue technique field, specifically is the physical experiments device that a kind of cut-pff wall thrusts soil deformation.
Background technology
After getting into 21 century, China's water resources and hydropower construction welcomes unprecedented construction peak, Yalongjiang River, Dadu River, the Lancang River, Jinsha jiang River, so that will build tens of high earth and rockfill dams and high earth rock cofferdam on the Nujiang, Yajiang.At present more than the 200m that builds and built in the high earth and rockfill dam, the overwhelming majority is the core wall rockfill dam that connects concrete cut under the employing soil property core-wall; High earth rock cofferdam adopts the antiseepage form that connects geomembrane on the cut-pff wall.Therefore, certainly exist cut-pff wall and surrounding medium INTERACTION PROBLEMS, adopt physical experiments research interaction mechanism, setting up constitutive relation and parameter is the important content of rock-soil mechanics test.For rigidity bigger cut-pff wall and clay or coarse-grained soil interaction, accurately disclose its intensity and deformation characteristic, particularly the characteristic of the surface of contact of wall top and filler should be carried out physical experiments.Adopt the surface of contact of Interface Element simulation wall top and filler at present; Still simulate as continuous medium; The cut-pff wall vertical displacement and the stress that all cause calculating are higher greatly; Because cut-pff wall top is thrust weir body filler and will be caused wall top contact pressure to discharge with the vertical deformation of wall top reducing greatly, its basic reason is to understand fully that not wall top and filler interaction deformation mechanism can rationally describe wall and push up the constitutive relation of thrusting soil deformation with setting up.
Because the complicacy of high earth and rockfill dam and high earth rock cofferdam work progress; It is very difficult with the change procedure that thrusts displacement to obtain cut-pff wall wall top stress; Therefore, the wall top is thrust the experimental study of soil deformation constitutive relation and is also become the difficult point problem in the rock-soil mechanics test.
If will make an experiment by traditional method of thinking; Employing applies soil pressure and measures model wall end pressure and thrust distortion; Can not guarantee to thrust the accurately qualitative of distortion, in addition directly on the soil body plus-pressure can make the soil solidifying draining produce distortion, make the stable cycle lengthening of test; Also can influence the measurement of thrusting distortion, all be to be difficult to accept on still being test period from the test instrument equipment performance.Therefore press for new test method and thinking; The novel test method that the inventor creates is to adopt reverse thinking to simulate this test; Promptly adopt triaxial test loading system to apply for the cut-pff wall model and thrust displacement; Adopt the placement in layers of air bag pressurization simulation dam; Adopt the micro pressure box to measure the wall end pressure, can comparatively accurately obtain so not the same cover original pressure (placement in layers of simulation dam) down the wall end pressure but still do not have the physical experiments device that ready-made cut-pff wall thrusts soil deformation in the prior art with thrusting the development of deformation Changing Pattern.
Summary of the invention
The utility model technical matters to be solved provides the physical experiments device that a kind of cut-pff wall thrusts soil deformation, can reflect accurately that cut-pff wall wall end stress is with the rule of development of thrusting distortion in high earth and rockfill dam and the high earth rock cofferdam work progress.
A kind of cut-pff wall thrusts the physical experiments device of soil deformation, comprises organic glass tank, model cut-pff wall, and said organic glass bucket is used to the soil sample of packing into; Certain space is reserved as the burden pressure chamber in the top of said machine glass tank; Burden pressure is provided with air bag in the chamber, and soil sample is inserted in the bottom of said model cut-pff wall, and the top is connected with the pressure rod that is connected with dial gauge; Pressure transducer is imbedded in the bottom of model cut-pff wall, and pressure transducer is connected with readout instrument through lead.
Further, the diameter of said organic glass bucket is 24.4cm, highly is 40cm, wall thickness 2.5cm.
Further, the top of said organic glass bucket is provided with, and the bottom is provided with the chassis, takes over a business with the chassis and adopts screwed pull bar screwing hermetic.
Further, take over a business to be provided with the burden pressure turnover connector that air feed capsule air intake opening passes.
Further, said pressure transducer is miniature soil pressure cell, the lead of drawing from miniature soil pressure cell through the transducer sheath after, after the limit wall cabling of organic glass bucket is drawn from the bottom, connect readout instrument.
Further, described readout instrument is a statical strain indicator.
Further, said model cut-pff wall adopts cylindrical organic tempered glass or cuboid plank to process.
The utility model adopts triaxial test loading system to apply for the model cut-pff wall and thrusts displacement; Adopt the placement in layers of air bag pressurization simulation dam; Adopts pressure sensor measures the wall end pressure, can comparatively accurately obtain the not the same wall end pressure that covers under the original pressure like this with thrusting the development of deformation Changing Pattern.The utility model is reasonable in design, simple for structure, easy to operate, satisfy the physical experiments requirement that cut-pff wall thrusts soil deformation fully.
Description of drawings
Fig. 1 is the cut-open view that the utility model cut-pff wall thrusts one of them embodiment of physical experiments device of soil deformation;
Fig. 2 is certain engineering wall end pressure and trial curve that thrusts deformation relationship and the matched curve of adopting the utility model to obtain.
Among the figure: the 1-pressure rod; The 2-dial gauge; The 3-pull bar; 4-burden pressure chamber; 5-transducer sheath; The 6-lead; The 7-pressure transducer; The 8-readout instrument; The 9-burden pressure is imported and exported; The 10-screw; The 11-transition bed; The 12-soil sample; 13-organic glass bucket; The 14-sand bedding course; The 15-chassis; 16-model cut-pff wall; 17-takes over a business.
Embodiment
To combine the accompanying drawing in the utility model below, the technical scheme in the utility model will be carried out clear, intactly description.
Shown in Figure 1 for the utility model cut-pff wall thrusts the cut-open view of one of them embodiment of physical experiments device of soil deformation, the physical experiments device that said cut-pff wall thrusts soil deformation comprises organic glass tank 13, model cut-pff wall 16, loading system and capacity value examining system.
The diameter of organic glass bucket 13 is 24.4cm in the present embodiment; Highly be 40cm, wall thickness 2.5cm, staving are every from top to bottom to adopt the adhesive tape hoop to reinforce at a distance from 6cm; Can guarantee security and sealing in the process of the test, certain space is reserved as burden pressure chamber 4 in the top of organic glass bucket 13.
Said model cut-pff wall 16 can adopt cylindrical organic tempered glass or cuboid plank to process, and the top of model cut-pff wall 16 is connected with said loading system, and loading system described in the present embodiment is typical triaxial test loading system.Concrete, the top of model cut-pff wall 16 is connected with pressure rod 1, and dial gauge 2 is connected with pressure rod 1, is used to measure the displacement of pressure rod 1, thereby obtains the deflection that model cut-pff wall 16 thrusts soil sample 12.Pressure transducer 7 is imbedded in the bottom of model cut-pff wall 16; Pressure transducer described in the present embodiment 7 is miniature soil pressure cell; The lead 6 of drawing from miniature soil pressure cell earlier through transducer sheath 5 in case broken; Lead 6 connects readout instrument 8 after the limit wall cabling of organic glass bucket 13 is drawn from the bottom then, and readout instrument described in the present embodiment 8 is a statical strain indicator.
Adopt air bag to charge into gases at high pressure in the burden pressure chamber 4 on said organic glass bucket 13 tops, its top is provided with burden pressure and imports and exports 9.
The step that adopts the utility model test unit to make an experiment is specific as follows:
1) at first organic glass bucket 13 is placed on the chassis 15, periphery is filled out fine sand bed course 14, makes the model bottom smooth.
2) the soil sample layering is packed in organic glass tank 13, the control soil sample is hitting reality under certain density, hits real back and adopts fine sand that reference laminas are set in the middle of soil sample 12, and test is every to be provided with one deck reference lamina at a distance from 2cm, and soil sample 12 installs to predetermined height always.
3) drive the deep trouth of certain depth at soil sample 12 centers, the model cut-pff wall 16 that miniature soil pressure cell can will be equipped with in the aperture is put into wherein, and guarantee model cut-pff wall 16 not off normal just in time in soil sample 12 centers.Add the butter transition bed 11 sealing soil samples of 3cm then at the soil sample upper surface, leave air bag above that.
4) with organic glass bucket 13 add have a counter-force bar take over a business 17, the air bag air intake opening is imported and exported 9 and is passed from taking over a business 17 burden pressures reserved.Adopt screwed pull bar 3 connect to take over a business 17 with chassis 15, tighten pull bar 3 to seal organic glass tank 13 with screw 10 then, adopt air bag on soil sample 12, to add predetermined burden pressure then, The model is left standstill make an experiment after 12 hours at last.
5) repeat above-mentioned steps, the test to different burden pressures is accomplished.
Accompanying drawing 2 is certain engineering wall end pressure and trial curve that thrusts distortion and the matched curve of adopting the utility model to obtain; The matched curve and the trial curve that as can be seen from the figure adopt this test result to obtain coincide together basically, prove that thus this novel test device is rational.
The above; Be merely the embodiment of the utility model; But the protection domain of the utility model is not limited thereto; Any technician who belongs to the present technique field is in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection domain of the utility model.Therefore, the protection domain of the utility model should be as the criterion with the protection domain of claim.
Claims (7)
1. a cut-pff wall thrusts the physical experiments device of soil deformation; It is characterized in that: comprise organic glass tank (13), model cut-pff wall (16); Said organic glass bucket (13) soil sample (12) that is used to pack into, the top of said machine glass tank (13) are reserved certain space as burden pressure chamber (4), and the burden pressure chamber is provided with air bag in (4); Soil sample (12) is inserted in the bottom of said model cut-pff wall (16); The top is connected with the pressure rod that is connected with dial gauge (2) (1), and pressure transducer (7) is imbedded in the bottom of model cut-pff wall (16), and pressure transducer (7) is connected with readout instrument (8) through lead (6).
2. cut-pff wall as claimed in claim 1 thrusts the physical experiments device of soil deformation, it is characterized in that: the diameter of said organic glass bucket (13) is 24.4cm, highly is 40cm, wall thickness 2.5cm.
3. according to claim 1 or claim 2 cut-pff wall thrusts the physical experiments device of soil deformation; It is characterized in that: the top of said organic glass bucket (13) is provided with (17); The bottom is provided with chassis (15), takes over a business (17) and chassis (15) and adopts screwed pull bar (3) screwing hermetic.
4. cut-pff wall as claimed in claim 3 thrusts the physical experiments device of soil deformation, it is characterized in that: take over a business (17) and be provided with the burden pressure turnover connector (9) that air feed capsule air intake opening passes.
5. cut-pff wall as claimed in claim 1 thrusts the physical experiments device of soil deformation; It is characterized in that: said pressure transducer (7) is miniature soil pressure cell; The lead (6) of drawing from miniature soil pressure cell through transducer sheath (5) after, after the limit wall cabling of organic glass bucket (13) is drawn from the bottom, connect readout instrument (8).
6. thrust the physical experiments device of soil deformation like claim 1 or 5 described cut-pff walls, it is characterized in that: described readout instrument (8) is a statical strain indicator.
7. cut-pff wall as claimed in claim 1 thrusts the physical experiments device of soil deformation, it is characterized in that: said model cut-pff wall (16) adopts cylindrical organic tempered glass or cuboid plank to process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120469653 CN202351119U (en) | 2011-11-23 | 2011-11-23 | Physical model test device for soil piercing deformation of cut-off wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120469653 CN202351119U (en) | 2011-11-23 | 2011-11-23 | Physical model test device for soil piercing deformation of cut-off wall |
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| Publication Number | Publication Date |
|---|---|
| CN202351119U true CN202351119U (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120469653 Expired - Lifetime CN202351119U (en) | 2011-11-23 | 2011-11-23 | Physical model test device for soil piercing deformation of cut-off wall |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914632A (en) * | 2012-10-16 | 2013-02-06 | 武汉理工大学 | Multifunctional geotechnical model test chamber |
| CN102937644A (en) * | 2012-11-23 | 2013-02-20 | 河海大学 | Compound vacuum negative pressure soft foundation solidification technology indoor simulation analysis meter |
| CN105424273A (en) * | 2015-12-15 | 2016-03-23 | 河南工业大学 | Novel indoor earth pressure cell calibration tank |
| CN106769478A (en) * | 2017-01-23 | 2017-05-31 | 浙江大学 | A kind of pile-soil interface shearing test device |
| CN110987634A (en) * | 2019-11-15 | 2020-04-10 | 河海大学 | Test device and test method for hydraulic fracture of gravel-doped core wall |
-
2011
- 2011-11-23 CN CN 201120469653 patent/CN202351119U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914632A (en) * | 2012-10-16 | 2013-02-06 | 武汉理工大学 | Multifunctional geotechnical model test chamber |
| CN102937644A (en) * | 2012-11-23 | 2013-02-20 | 河海大学 | Compound vacuum negative pressure soft foundation solidification technology indoor simulation analysis meter |
| CN105424273A (en) * | 2015-12-15 | 2016-03-23 | 河南工业大学 | Novel indoor earth pressure cell calibration tank |
| CN106769478A (en) * | 2017-01-23 | 2017-05-31 | 浙江大学 | A kind of pile-soil interface shearing test device |
| CN110987634A (en) * | 2019-11-15 | 2020-04-10 | 河海大学 | Test device and test method for hydraulic fracture of gravel-doped core wall |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120725 |
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| CX01 | Expiry of patent term |