CN205530405U - Centrifugal model testing device of composite foundation and common property of supporting construction - Google Patents
Centrifugal model testing device of composite foundation and common property of supporting construction Download PDFInfo
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- CN205530405U CN205530405U CN201620388546.3U CN201620388546U CN205530405U CN 205530405 U CN205530405 U CN 205530405U CN 201620388546 U CN201620388546 U CN 201620388546U CN 205530405 U CN205530405 U CN 205530405U
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Abstract
The utility model discloses a centrifugal model testing device of composite foundation and common property of supporting construction, including the mold box, be equipped with foundation soil in the mold box, the vertical backplate that is used for a simulation revetment that inlays in the foundation soil is equipped with a plurality of foundation pile model pile in that one side of mold box internal branch backplate is vertical, and the foundation soil top of inlaying foundation pile model pile sets up the mattress layer, and foundation soil, foundation pile model pile and mattress layer form the composite foundation jointly, and composite foundation and a common existence of the backplate construction environment that corresponds to reality more from this is used for the excavation district of simulation excavation in the opposite side setting of a backplate, whole test device can be used for the test when the foundation ditch excavates according to the demand setting, the test system of foundation soil deformation displacement data etc. In the composite foundation, excavating like this and distinguishing when excavating, research composite foundation and supporting construction's the power or the change of displacement production to better guidance practice.
Description
Technical field
This utility model relates to foundation model, particularly composite foundation and the centrifugal model test device of the common character of supporting construction.
Background technology
Tradition Geotechnical Engineering laboratory test is carried out under normal gravity condition, owing to or cannot be difficult to reproduce on-the-spot actual size
Condition, is the most often scaled model, and according to soil body weight stress, what scaled model brought is times contracting of soil body degree of depth h, enters
And change soil body self-weight stress field, to the structure with deadweight as primary load, it is impossible to and reflection prototype stress state, cause model
Test cannot simulate the phenomenon that prototype is occurred.
Geotechnical centrifugal model test can the existence of true simulated gravity field, reproduce engineering actual stress state, by numerous scholars
Being generally recognised as carrying out test method most advanced in Geotechnical Engineering research, maximally effective at present, geotechnical centrifugal model test is relative
In prototype measurement, indoor often gravitational field testing machine Numerical Simulations method, there is irreplaceable and unique advantage.
The most ripe with theory of composite foundation, a large amount of multi-rise buildings have employed CFG pile composite foundation.At present, lack both at home and abroad
The weary research theoretical for composite foundation Mechanical Characters of Composite Ground existing under lateral excavation condition and foundation pit supporting construction thereof makes engineering circles lack
Correctly carrying out theory and the method for this type of Design of Excavation Project, designer typically ignores existing composite foundation reinforcement, ignores
An existing clump of piles can reduce the advantageous effect of supporting construction displacement, and composite foundation is regarded as undisturbed soil, and conservative carries out foundation ditch
Engineering design, causes the substantial amounts of wasting of resources, and meanwhile, such to arrange measured data accuracy relatively low, it is impossible to more
Reaction Practical Project problem practically.
In sum, along with maximization, the complication of underground engineering, rely on the way of engineering experience in the past and can not meet and set
Meter, construction requirement, carry out base pit engineering centrifugal model test and can effectively study base pit engineering problem, promotes base pit engineering reason
Opinion is perfect with numerical simulation.
Utility model content
The purpose of this utility model is the centrifugal model that this utility model provides a kind of composite foundation and the common character of supporting construction
Assay device, this device, as the assay device of composite foundation Yu supporting construction, can be used for closing on composite foundation excavation of foundation pit
The research of mechanical property, to setting up to ensure the composite foundation Foundation Pit Support Design theory safely as target and method, has tight
The construction value compeled and long-range theory significance.
In order to reach above-mentioned purpose, this utility model adopts the following technical scheme that
Composite foundation and the centrifugal model test device of the common character of supporting construction, including model casing, be provided with ground in model casing
Base soil, is vertically embedded with the retaining-plate for simulating braced wall in foundation soil, in model casing, the side of retaining-plate is vertically provided with many
Individual foundation pile Model Pile, the foundation soil top being embedded with foundation pile Model Pile arranges bed course, and foundation soil, foundation pile Model Pile and mattress layer are altogether
Same form compound foundation, thus composite foundation and retaining-plate jointly exist and more conform to practice of construction environment, another at retaining-plate
Side is provided for the excavation area of excavation simulation；Whole assay device can be provided for testing when excavation of foundation pit according to demand,
The test system of foundation soil deformation displacement data etc. in composite foundation；So when excavation area is excavated, study composite foundation
The change that power or displacement with supporting construction produces, thus preferably Guiding Practice.
Further, for the ease of observing, model casing is that transparent material is made.
Further, multiple PIV labelling point for providing location reference is set in the outside of model casing, is so easy to analyze
The physical location of soil particle pixel in photograph sheet, also includes being installed on multiple shootings of excavation area in centrifuge crossbeam and model casing
Machine, can draw the misalignment of the soil body according to camera head gained photograph pixel analysis.
Further, described bed course is mattress layer, and described mattress layer is coarse sands layer.
Further, the surface-coated in foundation pile Model Pile has the epoxy coating increasing coefficient of friction, with sand in epoxy coating
Son；In order to increase the coefficient of friction on foundation pile Model Pile surface, need to be coated with a layer thickness at 0.5mm left and right thickness on its surface
Epoxy coating, spills sand, the friction surface that rear formation to be solidified is certain before epoxy coating is done and coagulated, increases coefficient of friction,
Its spacing determine according to acceleration proportionality coefficient according to actual pitch or according to experiment it needs to be determined that.
Further, being the internal earth bag equipped with soil for the excavation area of excavation simulation, earth bag outer surface is provided with and facilitates removal of soil
The suspension ring of bag, such setting greatly facilitates the excavating device excavation to soil layer.
Further, described retaining-plate is aluminium sheet, makes according to bending rigidity equivalence principle, is used for simulating support pile.
Further, described foundation pile Model Pile is CFG stake, is made up according to compressional stiffness equivalence of aluminium-alloy pipe.
Further, the bottom of described foundation pile Model Pile is coniform, it is simple to insert in foundation soil, upper end closure, its length
Determining according to centrifuge acceleration scale, acceleration proportionality coefficient is exactly centrifuge accekeration, comprehensive before test
The centrifuge accekeration determined after consideration, each unit determined after this accekeration in model test need according to the rules with
This scale smaller, such as acceleration magnitude are 40, and model length dimensional units should be just 1/40 size of prototype.
The manufacture method of described centrifugal model test device, specifically comprises the following steps that
1) use sand rain method that the foundation soil setting thickness is set in model casing；
2) in foundation soil, it is vertically arranged retaining-plate, continues in the side of retaining-plate to arrange foundation soil to the thickness set；
3) many foundation stake Model Pile is set in foundation soil and continues the top using sand rain method to foundation soil height Yu foundation pile Model Pile
End flushes；
4) in step 1) to step 3) carry out while, according to the bucket earthwork make earth bag；
5) earth bag is positioned over the opposite side of retaining-plate as excavation area；
6) in step 3) complete after or in step 5) complete after, be embedded with foundation pile Model Pile foundation soil top use sand rain
Method arranges coarse sand as mattress layer.
In step 1) and step 6) in all use a line point type sand rain method, control to fall away from, go out husky hole dimension and go out husky head and always flow
Amount is to reach target relative compaction.
The beneficial effects of the utility model are:
1) the assay device principle in this utility model is simple, and structure structure is clear, it is simple to installs and manufactures, cheap.
2) it is collectively forming the composite foundation construction environment as actual condition by foundation soil, foundation pile Model Pile and mattress layer, with
Practice of construction operating mode is consistent, meets the change of foundation soil actual stress, by the research of whole assay device, it is thus achieved that data tool
There is practical study meaning.
3) assay device made according to practice of construction environment, utilizes foundation pile model dress to replace the foundation pile in reality, earth bag to replace
Soil layer, retaining-plate to be excavated simulate support pile, though simple in construction, practicality is high, the beneficially research of actual condition.
Accompanying drawing explanation
Fig. 1 is top view of the present utility model.
Fig. 2 is the 1-1 profile of this utility model Fig. 1.
Fig. 3 is the 2-2 profile of this utility model Fig. 2.
In figure: 1, model casing；2, foundation soil；3, foundation pile Model Pile；4, mattress layer；5, earth bag；6, retaining-plate.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out clear,
Complete description.
As shown in Figure 1-Figure 3, composite foundation and the centrifugal model test device of the common character of supporting construction, including model casing 1,
For the ease of observing, model casing 1 is made for transparent material, is provided with foundation soil 2 in model casing 1, the most embedding in foundation soil 2
Having the retaining-plate 6 for simulating braced wall so that be divided into two regions in model casing, side is composite foundation district, and opposite side is
Excavation area, described retaining-plate is aluminium sheet, makes according to bending rigidity equivalence principle, the side of retaining-plate 6 in model casing 1
Vertically being provided with multiple foundation pile Model Pile 3, the foundation soil top being embedded with foundation pile Model Pile 3 arranges mattress layer 4, foundation soil 2, base
Stake Model Pile 3 and mattress layer 4 are collectively forming composite foundation, and thus composite foundation and retaining-plate 6 jointly exist and more conform to reality
Border construction environment, the opposite side at retaining-plate 6 is provided for the excavation area of excavation simulation；Whole assay device can be according to demand
It is provided for testing when excavation of foundation pit, the test system of foundation soil 2 deformation displacement data etc. in composite foundation；So opening
Dig district when excavating, the change that power or the displacement of research composite foundation and supporting construction produces, thus preferably instruct reality
Trample.
Bed course can be flexibility can also be rigidity, the concrete of rigid mat usually C7.5-C10 is pounded, and it is applicable to thin
And big monolithic floor surface and block surface layer；Flexible cushion (mattress layer) is usually with various scattered materials, such as sand, slag, broken
Stone, dirt etc. are compacted form, and it is applicable to thicker block surface layer.
Arrange multiple PIV labelling point in the outside of model casing 1, multiple video cameras are separately mounted on centrifuge crossbeam and model
The top of excavation area in case 1.
Further, there is the epoxy coating of increase coefficient of friction in foundation pile Model Pile 3 surface-coated, with sand in epoxy coating
Son；In order to increase the coefficient of friction on foundation pile Model Pile surface, need to be coated with a layer thickness at 0.5mm left and right thickness on its surface
Epoxy coating, spills sand, the friction surface that rear formation to be solidified is certain before epoxy coating is done and coagulated, increases coefficient of friction,
Its spacing determine according to acceleration proportionality coefficient according to actual pitch or according to experiment it needs to be determined that.
Being the internal earth bag 5 equipped with soil for the excavation area of excavation simulation, earth bag 5 outer surface is provided with the suspension ring facilitating removal of earth bag,
Such setting greatly facilitates the excavating device excavation to soil layer.
For meeting practice of construction environment, described foundation pile Model Pile 3 is CFG stake, by aluminium-alloy pipe according to compressional stiffness equivalence system
Becoming, the bottom of described foundation pile Model Pile 3 is coniform, it is simple to insert in foundation soil 2, upper end closure, its length according to from
Scheming centrifugal acceleration scale determines, centrifugal acceleration before the test according to test it needs to be determined that, typically consider field
Ground area, support pile and CFG stake stake are long, formation condition, indoor model test than the factor such as chi, centrifuge parameters, selected
Centrifugal model test than chi is, i.e. centrifuge setting speed, the every unit determined after centrifuge acceleration in test need by
Regulation carries out reduction conversion, and long measure here is scaled: the length dimension in model=physical length size/centrifugal acceleration.
The manufacture method of centrifugal model test device, specifically comprises the following steps that
1) use sand rain method that the foundation soil 2 setting thickness is set in model casing 1；
2) in foundation soil 2, it is vertically arranged retaining-plate 6, continues in the side of retaining-plate 6 to arrange foundation soil 2 to the thickness set
Degree；
3) arranging many foundation stake Model Pile 3 in foundation soil 2, foundation pile Model Pile 3 is CFG stake, according to acceleration ratio system
Number, precalculated CFG stake height h2, take foundation soil height h1+ CFG stake height h2About the twice for CFG height,
I.e. take h1=h2, and at model tank wall correspondence position h1、h2Place's reference mark, by foundation soil 2 sand rain method well prepared in advance
Insert in model casing 1, at foundation soil height h1Stop sand rain method behind slightly higher place and put sand, utilize thin horizontal line to make uniform in CFG stake
End, arrange each CFG stake in foundation soil 2, thin horizontal line flushes precalculated position h3Lower end, exists again with sand rain method
Sand waters in model casing 1 to height h in composite foundation district3Lower end；
4) in step 1) to step 3) carry out while, according to the bucket earthwork conversion make earth bag 5, filled by excavation of foundation pit
Put removal earth bag 5, it is achieved excavation models is excavated.Earth bag 5 uses high intensity cloth to make, and needs to carry out size according to excavation and sets
Count and sew up, retain top cover and do not sew up；
5) earth bag 5 is positioned over the opposite side of retaining-plate 6 as excavation area；
6) in step 3) complete after or in step 5) complete after, adopt at foundation soil 2 top being embedded with foundation pile Model Pile 3
By sand rain method, coarse sand is set as mattress layer 4, fallen away from, clearance hole size by control and go out Fructus Amomi total flow to reach target phase
To degree of compaction, mattress layer thickness determines according to centrifugal acceleration proportionality coefficient.
The above is only preferred implementation of the present utility model, it is noted that for the ordinary skill people of the art
For Yuan, on the premise of without departing from this utility model principle, it is also possible to make some improvements and modifications, these improve and profit
Decorations also should be regarded as protection domain of the present utility model.
Claims (9)
1. composite foundation and the centrifugal model test device of the common character of supporting construction, it is characterised in that include model casing,
It is provided with foundation soil in model casing, in foundation soil, is vertically embedded with the retaining-plate for simulating braced wall, retaining-plate in model casing
Side is vertically provided with multiple foundation pile Model Pile, and the foundation soil top being embedded with foundation pile Model Pile arranges bed course, foundation soil, foundation pile mould
Type stake and mattress layer are collectively forming composite foundation, and the opposite side at retaining-plate is provided for the excavation area of excavation simulation.
2. centrifugal model test device as claimed in claim 1, it is characterised in that model casing is that transparent material is made, institute
Stating bed course is mattress layer.
3. centrifugal model test device as claimed in claim 2, it is characterised in that multiple use is set in the outside of model casing
In providing the PIV labelling point of location reference, also include being installed on multiple video cameras of excavation area in centrifuge crossbeam and model casing.
4. centrifugal model test device as claimed in claim 1 or 2, it is characterised in that described mattress layer is coarse sands layer.
5. centrifugal model test device as claimed in claim 1 or 2, it is characterised in that be coated with on the surface of foundation pile Model Pile
It is covered with the epoxy coating increasing coefficient of friction, with sand in epoxy coating.
6. centrifugal model test device as claimed in claim 1 or 2, it is characterised in that for the excavation area of excavation simulation
For inside equipped with native earth bag, earth bag outer surface is provided with the suspension ring facilitating removal of earth bag.
7. centrifugal model test device as claimed in claim 1 or 2, it is characterised in that described retaining-plate is aluminium sheet.
8. centrifugal model test device as claimed in claim 1 or 2, it is characterised in that described foundation pile Model Pile is CFG
Stake, is made up according to compressional stiffness equivalence of aluminium-alloy pipe.
9. centrifugal model test device as claimed in claim 8, it is characterised in that the bottom of described foundation pile Model Pile is circle
Taper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620388546.3U CN205530405U (en) | 2016-04-30 | 2016-04-30 | Centrifugal model testing device of composite foundation and common property of supporting construction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620388546.3U CN205530405U (en) | 2016-04-30 | 2016-04-30 | Centrifugal model testing device of composite foundation and common property of supporting construction |
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| CN205530405U true CN205530405U (en) | 2016-08-31 |
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| CN201620388546.3U Expired - Fee Related CN205530405U (en) | 2016-04-30 | 2016-04-30 | Centrifugal model testing device of composite foundation and common property of supporting construction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105926688A (en) * | 2016-04-30 | 2016-09-07 | 山东大学 | Centrifugal model testing device provided with composite foundation and support structure with common shape and property and manufacturing method of centrifugal model testing device |
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2016
- 2016-04-30 CN CN201620388546.3U patent/CN205530405U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105926688A (en) * | 2016-04-30 | 2016-09-07 | 山东大学 | Centrifugal model testing device provided with composite foundation and support structure with common shape and property and manufacturing method of centrifugal model testing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160831 Termination date: 20170430 |