CN107806117A - The realization device and implementation method of soil lateral pressure in pile foundation model test - Google Patents
The realization device and implementation method of soil lateral pressure in pile foundation model test Download PDFInfo
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- CN107806117A CN107806117A CN201711280972.0A CN201711280972A CN107806117A CN 107806117 A CN107806117 A CN 107806117A CN 201711280972 A CN201711280972 A CN 201711280972A CN 107806117 A CN107806117 A CN 107806117A
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- 239000002689 soil Substances 0.000 title claims abstract description 72
- 238000012360 testing method Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- 238000006073 displacement reaction Methods 0.000 claims description 16
- 238000002474 experimental method Methods 0.000 claims description 11
- 239000011888 foil Substances 0.000 claims description 4
- 235000012489 doughnuts Nutrition 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- Structural Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides the realization device and implementation method of soil lateral pressure in a kind of pile foundation model test.The realization device of soil lateral pressure includes Model Pile, annulus load plate, pressurized equipment, the reaction frame for coordinating pressure with pressurized equipment, force cell, the uplift pile for supporting heatable adobe sleeping platform and placement reaction frame in pile foundation model test；Uplift pile is located at the periphery of heatable adobe sleeping platform, and Model Pile is vertically placed in heatable adobe sleeping platform, and force cell is located at the bottom of Model Pile；After the soil body fills up heatable adobe sleeping platform, annulus load plate is placed in soil body surface centered on Model Pile；The inside radius of annulus load plate is more than or equal to the height of Model Pile；Reaction frame is in uplift pile, and pressurized equipment is located at the top surface of annulus load plate located at the top of Model Pile and equably, and pressurized equipment correspondingly acts on reaction frame.The present invention can be simulated from stake top to stake bottom as depth gradually increases the actual soil lateral pressure that soil lateral pressure also gradually increases.
Description
Technical field
The invention belongs to Geotechnical Engineering pile foundation modeling techniques field, and in particular to side in a kind of pile foundation model test
To the realization device and implementation method of soil pressure.
Background technology
With the fast development of modern urban construction, there are many executive information systems, these buildings are to ground
Requirement for bearing capacity is higher.Pile foundation is widely used in foundation engineering as a kind of main base form.And in pile foundation
In engineering, the interaction of pile foundation and soil around pile is to study the key of pile foundation bearing capacity.Pile foundation model test is in research pile foundation
Played an important role in terms of stress performance and the mechanism of action.
But in model test, because stake long-press is reduced according to similar proportion, cause the lateral of stake in model test
Soil pressure differs larger with the soil lateral pressure of stake in Practical Project.In order to simulate actual soil lateral pressure, generally require and adopt
Use centrifuge.But centrifuge test is on the one hand with high costs；On the other hand, in pile foundation model test, in order to truly reflect
Actual pile-soil interaction, slip casting around pile effect etc., the reduced scale of model test is smaller, makes that moulded dimension is larger, weight
Heavier, now the power capacity of centrifuge does not reach the requirement of experiment, and the soil lateral pressure in the soil body is between stake soil
Rubbing action, the shape of stake soil cement plane have material impact.If actual soil lateral pressure can not be simulated, its result of the test is then
It is difficult to actual mechanical behavior and engineering characteristic for evaluation engineering prototype.
Therefore, development is a kind of can realize the method and device for simulating actual soil lateral pressure, for pile foundation model test
Development play an important roll.
The content of the invention
In order to overcome above-mentioned technological deficiency, the present invention provides a kind of realization device of soil lateral pressure in pile foundation model test
And implementation method, it is not necessary to by means of centrifuge, actual soil lateral pressure can be realized in pile foundation model test.
To achieve these goals, the present invention uses following technical scheme：
In a kind of pile foundation model test the realization device of soil lateral pressure include Model Pile, annulus load plate, pressurized equipment,
For coordinating the reaction frame of pressure, force cell with the pressurized equipment, for supporting heatable adobe sleeping platform and place the reaction frame
Uplift pile；The uplift pile is located at the periphery of heatable adobe sleeping platform, and the Model Pile is vertically placed in the heatable adobe sleeping platform, and the force cell is set
In the bottom of the Model Pile；After the soil body fills up heatable adobe sleeping platform, the annulus load plate is placed in the soil body centered on the Model Pile
Surface；The inside radius of the annulus load plate is more than or equal to the height of the Model Pile；The reaction frame is located at the resistance to plucking
In stake, the pressurized equipment is located at the top surface of the annulus load plate located at the top of the Model Pile and equably, and described
Pressurized equipment correspondingly acts on the reaction frame.
Preferably, the annulus load plate is socketed successively by multiple donuts forms, and the inside radius of innermost layer annulus is big
In or equal to the Model Pile height；Of annulus can be determined according to the soil lateral pressure size that experiment needs to realize
Number.
Preferably, the radius of the heatable adobe sleeping platform is 2.5-3.5 times of the Model Pile height.The height of the Model Pile and half
Footpath determines according to the model test likelihood ratio.
Preferably, the realization device of soil lateral pressure also includes foil gauge, the foil gauge in a kind of pile foundation model test
Located at the Model Pile side；Can the height stake of measurement model stake at any time axle power change, calculate pile side friction and stake end branch
Support force.
Preferably, the realization device of soil lateral pressure also includes being used for mould described in elastic carrier in a kind of pile foundation model test
The latch plate of type stake, the latch plate are located at the bottom of the force cell.Latch plate is set more realistically to simulate stake
Hold carrying effect.The depth of the heatable adobe sleeping platform is the Model Pile and the height sum of the latch plate.
Preferably, the number of the uplift pile is 6-12 roots.
Preferably, the reaction frame includes inner ring, the outer shroud concentric with the inner ring and the support for being connected inner ring and outer shroud
Bar；The support bar is crossed to form central point；The angle that the adjacent support bar is formed is identical.
It is particularly preferred, the support bar include connection inner ring and outer shroud first support bar and connection inner ring and outer shroud and
Meet at the second support bar at center；The second support bar is crossed to form central point；The first support bar and second support bar
Interlaced arrangement, and adjacent first support bar is identical with the angle that second support bar is formed.
Preferably, the pressurized equipment is jack；The jack is located at the top of institute's displacement sensors, and very heavy
The top on top corresponds to the central point of the reaction frame；The jack is further equally located at the top surface of the annulus load plate, and
The top of jack is corresponded on the support bar of the reaction frame.The soil lateral pressure size for needing to realize according to experiment determines very heavy
The number on top and jack top power size, and the height of the uplift pile determines according to jack top power size.
The implementation method of soil lateral pressure, step are as follows in a kind of pile foundation model test：
S1：Heatable adobe sleeping platform is arranged, and uplift pile is set on heatable adobe sleeping platform periphery；
S2：Force cell is located to the bottom of Model Pile, then the Model Pile is vertically placed in heatable adobe sleeping platform；And to heatable adobe sleeping platform
In insert the soil body, until fill up whole heatable adobe sleeping platform；
S3：By annulus load plate centered on the Model Pile, soil body surface is placed in, is then placed on counter-force described anti-
The top of pile pulling, and it is fixed；The inside radius of the annulus load plate is more than or equal to the height of the Model Pile；
S4：By pressurized equipment located at the top of the Model Pile and equably in the annulus load plate, and described
Pressurized equipment correspondingly acts on the reaction frame；
S5：During experiment, the pressurized equipment starts to press, and applies different loads by the pressurized equipment, obtains experiment
Data.
Preferably, the step S2 includes for force cell being located at the bottom of Model Pile, and latch plate then is located at into institute
The bottom of force cell is stated, then the Model Pile is vertically placed in heatable adobe sleeping platform；And the soil body is inserted into heatable adobe sleeping platform, until filling up whole
Individual heatable adobe sleeping platform.
Preferably, the step S4 includes for displacement transducer being located at the top of the Model Pile, and the pressurized equipment is set
In the top of institute's displacement sensors and equably located at the top surface of the annulus load plate, and pressurized equipment correspondingly acts on institute
State reaction frame.
Particularly preferred, the pressurized equipment is jack；The step S4 includes institute's displacement sensors being located at institute
The top of Model Pile is stated, then the jack is located at the top of institute's displacement sensors, and the corresponding effect in top of jack
In the central point of the reaction frame, jack is further equally located at the top surface of the annulus load plate, and the top pair of jack
It should act on the support bar of the reaction frame.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, the present invention is more than or equal to the annulus load plate of Model Pile height by inside radius, added located at Model Pile and annulus
Pressurized equipment on support plate coordinates reaction frame to apply pressure to the soil body, can simulate from stake top to stake bottom as depth gradually increases
The actual soil lateral pressure that big soil lateral pressure also gradually increases；
2nd, by the force cell located at Model Pile bottom, can the bottom of feedback model stake at any time stressing conditions；
3rd, Model Pile is vertically placed in heatable adobe sleeping platform by the present invention, and heatable adobe sleeping platform size and depth can be true according to different tests requirement
Determine, not the certain model casing of size depth, the soil lateral pressure field of different depth can be realized according to different tests condition, this
For in research pile foundation test, there is crucial shadow the problems such as pile-soil interaction, slip casting around pile effect, stake soil cement plane shape
Ring；
4th, pressurized equipment is located at the top surface of the annulus load plate located at the top of the bit model stake and equably, realizes
Model Pile is fifty-fifty by the soil lateral pressure in all directions.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the schematic diagram of principle of the invention experiment；
Fig. 3 is the datagram of lateral stress in experiment shown in Fig. 2；
Fig. 4 is the schematic flow sheet of the device implementation method shown in Fig. 1；
1- Model Piles；2- force cells；3- latch plates；4- displacement transducers；5- annulus load plates；6- jack；7-
Reaction frame；8- uplift piles；9- heatable adobe sleeping platforms.
Embodiment
The preferred embodiments of the present invention are illustrated below in conjunction with accompanying drawing, it will be appreciated that described herein preferred real
Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Embodiment 1：
As shown in figure 1, the realization device of soil lateral pressure includes Model Pile 1 in a kind of pile foundation model test, annulus loads
Plate 5, pressurized equipment, force cell 2, for pressurized equipment coordinate pressure reaction frame 7, for supporting heatable adobe sleeping platform 9 and place
The uplift pile 8 of reaction frame 7.The inside radius of annulus load plate 5 is more than or equal to the height of Model Pile 1.Preferably, annulus load plate
5 are socketed and form successively by multiple donuts, and the inside radius of innermost layer annulus is more than or equal to the height of Model Pile 1；Can root
Factually testing needs the soil lateral pressure size realized to determine the number of annulus.In the present embodiment, annulus number is 3.
Specifically, the radius of heatable adobe sleeping platform 9 is 2.5-3.5 times of the height of Model Pile 1；The depth of heatable adobe sleeping platform 9 is Model Pile 1 and spring
The height sum of plate 3.The height and radius of Model Pile 1 determine according to the model test likelihood ratio.Uplift pile 8 is located at the week of heatable adobe sleeping platform 9
Side.Preferably, the number of uplift pile 8 is 6-12 roots.Force cell 2 is located at the bottom of Model Pile 1.Model Pile 1 is vertically placed to
In heatable adobe sleeping platform 9.Reaction frame 7 includes inner ring, the outer shroud concentric with inner ring and the support bar for being connected inner ring and outer shroud；Support bar intersects shape
Into central point, the angle that adjacent supports bar is formed is identical.In the present embodiment, support bar includes first of connection inner ring and outer shroud
Strut and connection inner ring and outer shroud and meet at the second support bar at center；Second support bar is crossed to form central point.First support
Bar and second support bar interlaced arrangement, and adjacent first support bar is identical with the angle that second support bar is formed.Filled out in the soil body
After full heatable adobe sleeping platform 9, annulus load plate 5 is placed in soil body surface centered on Model Pile 1.Pressurized equipment located at Model Pile 1 top and
Equably in annulus load plate 5, and pressurized equipment correspondingly acts on reaction frame 7.Pressurized equipment is very heavy in the present embodiment
Top 6.Jack 6 is located at the top of displacement transducer 4, and the top of jack 6 correspondingly acts on the central point of reaction frame 7；Thousand
Jin top 6 is further equally located at the top surface of annulus load plate 5, and the top of jack 6 correspondingly acts on the support bar of reaction frame 7
On.The number of jack 6 and the top power size of jack 6 are determined according to the soil lateral pressure size that experiment needs to realize, and resisted
The height of pile pulling 8 determines according to the top power size of jack 6.
As shown in figure 1, the realization device of soil lateral pressure also includes being used for elastic carrier mould in a kind of pile foundation model test
The latch plate 3 of type stake 1, latch plate 3 are located at the bottom of force cell 2.Set latch plate 3 more realistically to simulate an end to hold
Load acts on.
As shown in figure 1, the realization device of soil lateral pressure also includes displacement transducer 4, position in a kind of pile foundation model test
Displacement sensor 4 is located at the top of Model Pile 1.Displacement transducer 4 can feedback model stake at any time 1 moved down after compression
Situation.
The technical principle of the realization device of soil lateral pressure in the pile foundation model test of the present embodiment：
As shown in Fig. 2 under conditions of gradually increasing with vertical height, it is different with outer radius scale to inside radius
Annulus applies identical load, calculates the change of lateral stress.It is theoretical using " Boussinesq's formula ", laterally should caused by calculating
As shown in figure 3, when vertical height/annulus inside radius is less than or equal to 1, lateral stress gradually increases power；When vertical height/circle
When ring inside radius is more than 1, lateral stress is gradually reduced.Therefore, inventor has found this principle being used in pile foundation model test,
The inside radius of annulus load plate is more than or equal to Model Pile height, and pressurized equipment is equably set in annulus load plate, can be real
The effect that existing soil lateral pressure gradually increases.Soil lateral pressure changing rule suffered by Practical Project stake be from stake top to stake bottom with
Depth gradually increases soil lateral pressure and also gradually increased.It can be seen that the present invention is more than or equal to the height of Model Pile 1 by inside radius
Annulus load plate 5 and the pressurized equipment in annulus load plate 5 apply pressure to the soil body, can accurately simulate and reality
Soil lateral pressure suffered by engineering pile.
In addition, as shown in Fig. 2 the numerical value of annulus outer radius/annulus inside radius is bigger, then lateral stress is bigger.It can be seen that circle
The external diameter of ring load plate is used for the maximum for controlling the soil lateral pressure applied.Therefore, the side realized can be needed according to experiment
The outside dimension of annulus load plate 5 is determined to soil pressure size, you can determines the annulus number of annulus load plate 5.
As shown in figure 4, realizing the method for actual soil lateral pressure in pile foundation model test described in the present embodiment, step is such as
Under：
S1：Heatable adobe sleeping platform 9 is arranged, and uplift pile 8 is set on heatable adobe sleeping platform periphery；
S2：Force cell 2 is located to the bottom of force cell 2 located at the bottom of Model Pile 1, latch plate 3, then by mould
Type stake 1 is vertically placed in heatable adobe sleeping platform 9；And the soil body is inserted into heatable adobe sleeping platform 9, until filling up whole heatable adobe sleeping platform；
S3：By annulus load plate 5 centered on Model Pile 1, soil body surface is placed in, reaction frame 6 is then placed in uplift pile 8
Top, it is and fixed；The inside radius of annulus load plate 5 is more than or equal to the height of Model Pile 1；
S4：Displacement transducer 4 is located to the top of Model Pile 1, then jack 6 is located at the top of displacement transducer 4, and
The top of jack 6 correspondingly acts on the central point of reaction frame 7；Jack 6 is further equally located at the top surface of annulus load plate 5,
And the top of jack 6 correspondingly acts on the support bar of reaction frame 7.
S5：During experiment, pressurized equipment starts to press, and applies different loads by pressurized equipment, obtains test data.
The above described is only a preferred embodiment of the present invention, any formal limitation not is done to the present invention, therefore
All contents without departing from technical solution of the present invention, the technical spirit according to the present invention any are simply repaiied to made for any of the above embodiments
Change, equivalent variations and modification, in the range of still falling within technical solution of the present invention.
Claims (10)
1. the realization device of soil lateral pressure in a kind of pile foundation model test, it is characterised in that loaded including Model Pile, annulus
Plate, pressurized equipment, for the pressurized equipment coordinate pressure reaction frame, force cell, for supporting heatable adobe sleeping platform and placement
The uplift pile of the reaction frame；
The uplift pile is located at the periphery of heatable adobe sleeping platform, and the Model Pile is vertically placed in the heatable adobe sleeping platform, and the force cell is located at
The bottom of the Model Pile；
After the soil body fills up heatable adobe sleeping platform, the annulus load plate is placed in soil body surface centered on the Model Pile；The annulus adds
The inside radius of support plate is more than or equal to the height of the Model Pile；
For the reaction frame in the uplift pile, the pressurized equipment is located at the top of the Model Pile and is equably located at institute
The top surface of annulus load plate is stated, and the pressurized equipment correspondingly acts on the reaction frame.
2. the realization device of soil lateral pressure in a kind of pile foundation model test according to claim 1, it is characterised in that institute
State annulus load plate and be socketed successively by multiple donuts and formed, the inside radius of innermost layer annulus is more than or equal to the Model Pile
Height.
3. the realization device of soil lateral pressure in a kind of pile foundation model test according to claim 1, it is characterised in that institute
The radius for stating heatable adobe sleeping platform is 2.5-3.5 times of the Model Pile height.
4. the realization device of soil lateral pressure in a kind of pile foundation model test according to claim 1, it is characterised in that also
Including foil gauge, the foil gauge is located at the Model Pile side.
5. the realization device of soil lateral pressure in a kind of pile foundation model test according to claim 1, it is characterised in that also
Including the latch plate for Model Pile described in elastic carrier, the latch plate is located at the bottom of the force cell.
6. the realization device of soil lateral pressure in a kind of pile foundation model test according to claim 1, it is characterised in that institute
Stating reaction frame includes inner ring, the outer shroud concentric with the inner ring and the support bar for being connected inner ring and outer shroud；The support bar intersects
Form central point；The angle that the adjacent support bar is formed is identical.
7. the realization device of soil lateral pressure in a kind of pile foundation model test according to claim 6, it is characterised in that institute
It is jack to state pressurized equipment；The jack is located at the top of the Model Pile, and the top of jack correspondingly acts on institute
State the central point of reaction frame；The jack is further equally located at the top surface of the annulus load plate, and the top pair of jack
The support bar of the reaction frame should be acted on.
8. the realization device of soil lateral pressure in a kind of pile foundation model test according to claim 1, it is characterised in that also
Including displacement transducer, institute's displacement sensors are located between the Model Pile and pressurized equipment.
9. the implementation method of soil lateral pressure in a kind of pile foundation model test, it is characterised in that step is as follows：
S1：Heatable adobe sleeping platform is arranged, and uplift pile is set on heatable adobe sleeping platform periphery；
S2：Force cell is located to the bottom of Model Pile, then the Model Pile is vertically placed in heatable adobe sleeping platform；And filled out into heatable adobe sleeping platform
Enter the soil body, until filling up whole heatable adobe sleeping platform；
S3：By annulus load plate centered on the Model Pile, soil body surface is placed in, counter-force is then placed on the uplift pile
Top, it is and fixed；The inside radius of the annulus load plate is more than or equal to the height of the Model Pile；
S4：By pressurized equipment located at the top of the Model Pile and equably in the annulus load plate, and the pressurization
Equipment correspondingly acts on the reaction frame；
S5：During experiment, the pressurized equipment starts to press, and applies different loads by the pressurized equipment, obtains test data.
10. implementation method according to claim 9, it is characterised in that the step S2 includes force cell being located at
The bottom of Model Pile, then latch plate is located to the bottom of the force cell, then the Model Pile is vertically placed to heatable adobe sleeping platform
In；And the soil body is inserted into heatable adobe sleeping platform, until filling up whole heatable adobe sleeping platform；And/or the step S4 includes displacement transducer being located at institute
The top of Model Pile is stated, the pressurized equipment is located at the top of institute's displacement sensors and is equably located at the annulus load plate
Top surface, and pressurized equipment correspondingly acts on the reaction frame.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711280972.0A CN107806117B (en) | 2017-12-06 | 2017-12-06 | Device and method for realizing lateral soil pressure in pile foundation model test |
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| CN201711280972.0A CN107806117B (en) | 2017-12-06 | 2017-12-06 | Device and method for realizing lateral soil pressure in pile foundation model test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109706908A (en) * | 2019-01-28 | 2019-05-03 | 重庆大学 | A kind of soil around pile Particle Breakage measuring device and its measurement method |
| CN111505250A (en) * | 2020-06-08 | 2020-08-07 | 金陵科技学院 | Landslide fixed support model based on composite material and matched sensor arrangement method |
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| CN111505250A (en) * | 2020-06-08 | 2020-08-07 | 金陵科技学院 | Landslide fixed support model based on composite material and matched sensor arrangement method |
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| Publication number | Publication date |
|---|---|
| CN107806117B (en) | 2024-01-26 |
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