CN207832473U - A kind of model assay systems of research high gradient slope pier footing stress deformation characteristic - Google Patents
A kind of model assay systems of research high gradient slope pier footing stress deformation characteristic Download PDFInfo
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- CN207832473U CN207832473U CN201721585582.XU CN201721585582U CN207832473U CN 207832473 U CN207832473 U CN 207832473U CN 201721585582 U CN201721585582 U CN 201721585582U CN 207832473 U CN207832473 U CN 207832473U
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Abstract
A kind of model assay systems of research high gradient slope pier footing stress deformation characteristic, pier footing itself stress and deformation, the real-time monitoring of the horizontal displacement of pier footing surrounding soil and slope surface characteristic point horizontal displacement during being tested with implementation model, and have the characteristics that simple and convenient and accurate and reliable.Pilot system includes：Reduced scale high gradient slope body soil model, fills in model casing, is made of gliding mass and slider bed, the formation sliding surface of the two；Reduced scale pier footing model is embedded in pier footing surrounding soil model, and the pier footing of its underpart enters across gliding mass in slider bed；Jack loading system, by loading baffle along sliding surface direction hierarchical loading in gliding mass rear end；Test device, including device is tested in pier footing stress and deformation test device, pier footing surrounding soil horizontal distortion test device and slope surface characteristic point horizontal displacement, be set on pier footing and reduced scale pier footing surrounding soil model in.
Description
Technical field
Utility model is related to geotechnical engineering, more particularly to a kind of mould of research high gradient slope pier footing stress deformation characteristic
Type pilot system.
Background technology
Research to pier footing bearing mechanism and mechanical characteristic is to carry out the base of bearing capacity research, inner-force analysis
Plinth, and establish and rationally design theoretical premise.For all kinds of pile foundations on level land, domestic and foreign scholars have made intensive studies,
And lot of research is obtained, the bearing mechanism and load transmittance process to this type foundation pile have formd a set of more complete
With ripe theoretical system, and received by numerous engineers and technicians.And by geographical location, load and stake week rock-soil material etc.
The influence of factor, on high gradient slope the bearing mechanism of pier footing with mechanical characteristic compared with ordinary pile foundation, there are many differences,
Thus the application of conventional wisdom will be subject to certain restrictions.
Indoor layer during similar model test is the common research means for studying high gradient slope pier footing mechanical characteristic.High steep side
Caused by the lateral load of Ramp bridge pier foundation is mainly the lateral deformation by gliding mass, the monitoring to the deformation of pier footing surrounding soil
Mechanical characteristic to studying high gradient slope pier footing has very important significance.And high gradient slope pier footing was studied in the past
In the model test of stress deformation characteristic, it is only capable of testing the stress of pier footing itself with deformation.The reason is that：
(1) common slopes internal displacement monitoring means are (such as：Multipoint displacement meter, inclinometer pipe etc.), it is mainly used for outdoor large scale mould
Type is tested or field monitors on the spot, and traditional monitoring means often cannot be satisfied the required precision of indoor model test；(2) three-dimensional
Laser scanner and high-speed camera measure the displacement that can only measure side slope slope surface, and equipment price costliness is not easy to obtain.
Therefore, the model test test system of existing high gradient slope pier footing stress deformation characteristic is still incomplete,
The measurement of pier footing surrounding soil horizontal distortion urgently supplements especially in model test.
Utility model content
The technical problem to be solved is that provide a kind of research high gradient slope pier footing stress deformation characteristic for utility model
Model assay systems, pier footing itself stress and deformation, pier footing surrounding soil water during being tested with implementation model
Prosposition moves and the real-time monitoring of slope surface characteristic point horizontal displacement, and has the characteristics that simple and convenient and accurate and reliable.
Technical solution is as follows used by utility model solves its technical problem：
A kind of model assay systems of research high gradient slope pier footing stress deformation characteristic of the utility model, feature
It is that it includes：Reduced scale high gradient slope body soil model, fills in model casing, is made of gliding mass and slider bed, and the formation of the two is slided
Dynamic face；Reduced scale pier footing model is embedded in pier footing surrounding soil model, the pier footing of its underpart pass through gliding mass into
Enter in slider bed；Jack loading system, by loading baffle along sliding surface direction hierarchical loading in gliding mass rear end；Device is tested,
Including pier footing stress and deformation test device, pier footing surrounding soil horizontal distortion test device and slope surface feature
Point horizontal displacement test device, be set on pier footing and reduced scale pier footing surrounding soil model in.
The utility model has the beneficial effects that solving inside the model test mesoslope body of previous high gradient slope pier footing
Horizontal distortion is difficult to the problem of obtaining, and can meet the test of pier footing itself stress and deformation simultaneously, soil around pier footing
The test of test and the slope surface characteristic point horizontal displacement of body horizontal distortion；This method is simple and convenient, it is accurate and reliable, convenient for real
It applies；Pasting the phosphorus bronze band of foil gauge can be embedded at any position of high gradient slope model, obtain entire high gradient slope system
Horizontal displacement situation of change spatially, the stress deformation of pier footing and the deformation of its surrounding soil are connected.
Description of the drawings
This specification includes following seven width attached drawing：
Fig. 1 is the work point prototype diagrammatic cross-section of Example selected by the utility model；
Fig. 2 is model test apparatus diagrammatic cross-section；
Fig. 3 is high gradient slope pier footing scale model diagrammatic cross-section；
Fig. 4 is high gradient slope pier footing scale model schematic top plan view；
Fig. 5 is miniature earth pressure gauge layout diagram；
Fig. 6 is foil gauge layout diagram；
Fig. 7 is phosphorus bronze band strain gauge adhesion schematic diagram.
Component and corresponding label are shown in figure：Gliding mass 1, sliding surface 2, slider bed 3, pier footing 4, pier footing cushion cap 5,
Model casing 6, jack loading system 7, counterforce device 8 load baffle 9, high gradient slope slope foot 10, horizontal displacement meter 11, phosphorus blueness
Copper strips 12, earth pressure test foundation pile 13, strain testing foundation pile 14, miniature earth pressure gauge 15, foil gauge 16, pile strain piece 16a.
Specific implementation mode
Utility model is further illustrated with reference to the accompanying drawings and examples.
Referring to Figures 1 and 2, the model test of a kind of research high gradient slope pier footing stress deformation characteristic of utility model
System includes：Reduced scale high gradient slope body soil model, fills in model casing 6, is made of gliding mass 1 and slider bed 3, the formation of the two
Sliding surface 2；Reduced scale pier footing model is embedded in pier footing surrounding soil model, and the pier footing 4 of its underpart, which passes through, to be slided
Body 1 enters in slider bed 3；Jack loading system 7, by load baffle 9 along 2 direction hierarchical loading of sliding surface after gliding mass 1
End；Test device, including pier footing stress and deformation test device, pier footing surrounding soil horizontal distortion test device and
Slope surface characteristic point horizontal displacement test device, be set on pier footing 4 and reduced scale pier footing surrounding soil model in.
The utility model is using by the way of 3 direction hierarchical loading of sliding surface, model is calculated by three-dimensional artificial in 1 rear of gliding mass
The loading effect point at rear portion simulates landslide caused by (such as rainfall) under the Thrust of Landslide and external force factor that rear portion gliding mass 1 generates
Thrust-augmented situation solves horizontal distortion inside the model test mesoslope body of previous high gradient slope pier footing and is difficult to obtain
The problem of, the test of pier footing itself stress and deformation, the test of pier footing surrounding soil horizontal distortion can be met simultaneously
And the test of slope surface characteristic point horizontal displacement.
With reference to Fig. 4, determining earth pressure test foundation pile 13 and strain is selected to survey in each bridge pier foundation pile on the pier footing 4
Foundation pile 14 is tried, using heel row bridge pier foundation pile as strain testing foundation pile 14, corresponding front row bridge pier foundation pile is as earth pressure test
Foundation pile 13.Referring to figure 5 and figure 6, the pier footing stress includes that miniature earth pressure gauge 15 and pile body are answered with deformation test device
Become piece 16a, the vertical interval of miniature earth pressure gauge 15 is pasted on the leading flank of earth pressure test foundation pile 13 and strain testing base
On the leading flank and trailing flank of stake 14, vertically interval is pasted on the surface of strain testing foundation pile 14 pile strain piece 16a in groups,
Every group includes multiple circumferentially spaced-apart pile strain piece 16a.
Referring to figure 6 and figure 7, the pier footing surrounding soil horizontal distortion test device is that vertical interval is pasted on phosphorus blueness
The foil gauge 16 of copper strips 12, phosphorus bronze band 12 are embedded in around pier footing 4 vertically at a certain distance, and bottom end is fixed on model
1 surface of gliding mass is freely stretched out in 6 bottom of case, upper end.
With reference to Fig. 3, the slope surface characteristic point horizontal displacement test device is horizontal displacement meter 11, is set to gliding mass 1
With the front end intersection of 3 front end intersection of slider bed and gliding mass 1 and the pier footing cushion cap 5 on 4 top of pier footing.
With reference to Fig. 2, counterforce device 8 is fixedly installed in the model casing 6, jack loading system 7 is filled mounted on the counter-force
It sets on 8.
A kind of model assay systems of research high gradient slope pier footing stress deformation characteristic of the utility model are by following step
Rapid test：
1. according to the principle of similitude, reduced scale pier footing model is made, in filling the reduced scale high gradient slope body soil body in model casing 6
Model, and reduced scale pier footing model is embedded in the inner；
2. laying pier footing stress and deformation test device, pier footing surrounding soil horizontal distortion test device and slope
Device is tested in body surface region feature point horizontal displacement；
3. installing jack loading system 7 on counterforce device 8, the load baffle 9 of front end is perpendicular to sliding surface 2；
4. carrying out preloading in five minutes or more to model, preload is the 1/10~1/5 of design maximum load；
5. removal load, debugging test instrument, carry out experiment preparation；
6. jack loading system 7 carries out hierarchical loading to gliding mass 1 by loading baffle 9, makes entire high gradient slope system
It is gradually deformed until final destruction, carries out the record work of data by Acquisition Instrument and computer in the process.
Experiment after the completion of remove model, and carry out and take pictures, camera shooting etc. record work, clear up model casing, carry out data analysis
Processing work.
The step 3. in, the loading effect point of jack loading system 7 is calculated by three-dimensional artificial.The step
It in 6., is further applied load according to the classification of default peak load, every grade of load should keep the load five minutes or more after applying, to be tested
Next stage load can be carried out after data stabilization.
Claims (5)
1. a kind of model assay systems of research high gradient slope pier footing stress deformation characteristic, it is characterized in that it includes：Reduced scale
High gradient slope body soil model is filled in model casing (6), is made of gliding mass (1) and slider bed (3), the formation sliding surface of the two
(2)；Reduced scale pier footing model is embedded in pier footing surrounding soil model, and the pier footing (4) of its underpart passes through gliding mass
(1) enter in slider bed (3)；Jack loading system (7), by loading baffle (9) along sliding surface (2) direction hierarchical loading in cunning
Body (1) rear end；Device is tested, including pier footing stress is surveyed with deformation test device, pier footing surrounding soil horizontal distortion
It tries device and device is tested in slope surface characteristic point horizontal displacement, be set on pier footing (4) and around reduced scale pier footing
In soil model.
2. a kind of model assay systems of research high gradient slope pier footing stress deformation characteristic as described in claim 1,
It is characterized in：Determining earth pressure test foundation pile (13) and strain testing base are selected on the pier footing (4) in each bridge pier foundation pile
Stake (14), using heel row bridge pier foundation pile as strain testing foundation pile (14), corresponding front row bridge pier foundation pile is as earth pressure test
Foundation pile (13)；The pier footing stress and deformation test device include miniature earth pressure gauge (15) and pile strain piece (16a),
The vertical interval of miniature earth pressure gauge (15) is pasted on the leading flank of earth pressure test foundation pile (13) and strain testing foundation pile
(14) on leading flank and trailing flank, pile strain piece (16a) is vertical in groups to be spaced the table for being pasted on strain testing foundation pile (14)
On face, every group includes multiple circumferentially spaced-apart pile strain pieces (16a).
3. a kind of model assay systems of research high gradient slope pier footing stress deformation characteristic as described in claim 1,
It is characterized in：The pier footing surrounding soil horizontal distortion test device is the strain that vertical interval is pasted on phosphorus bronze band (12)
Piece (16), phosphorus bronze band (12) are embedded in vertically at a certain distance around pier footing (4), and bottom end is fixed on model casing (6)
Gliding mass (1) surface is freely stretched out in bottom, upper end.
4. a kind of model assay systems of research high gradient slope pier footing stress deformation characteristic as described in claim 1,
It is characterized in：The slope surface characteristic point horizontal displacement test device is horizontal displacement meter (11), is set to gliding mass (1) and slider bed
(3) the front end intersection of front end intersection and gliding mass (1) and the pier footing cushion cap (5) on pier footing (4) top.
5. a kind of model assay systems of research high gradient slope pier footing stress deformation characteristic as described in claim 1,
It is characterized in：Fixed setting counterforce device (8) in the model casing (6), jack loading system (7) are mounted on the counterforce device
(8) on.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107991115A (en) * | 2017-11-23 | 2018-05-04 | 中国铁路总公司 | A kind of model assay systems and test method for studying high gradient slope pier footing stress deformation characteristic |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107991115A (en) * | 2017-11-23 | 2018-05-04 | 中国铁路总公司 | A kind of model assay systems and test method for studying high gradient slope pier footing stress deformation characteristic |
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