CN207730580U - A kind of simulation is caused the experimental rig of negative friction of pile neutral point variation by ground preloading - Google Patents
A kind of simulation is caused the experimental rig of negative friction of pile neutral point variation by ground preloading Download PDFInfo
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- CN207730580U CN207730580U CN201820093406.2U CN201820093406U CN207730580U CN 207730580 U CN207730580 U CN 207730580U CN 201820093406 U CN201820093406 U CN 201820093406U CN 207730580 U CN207730580 U CN 207730580U
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Abstract
The utility model discloses a kind of simulations to cause the experimental rig that negative friction of pile neutral point changes by ground preloading, which includes cylindrical model case, ground loading system and image capturing system.Cylindrical model case is made of cup dolly and cylindrical transparent side wall glass；Transparent soil is filled inside model casing, model test stake upper edge depth does several marks, coloured gravel is arranged symmetrically in the transparent soil layer of different depth, and note upper height in transparent mould molding box external standard.Load plate is placed on transparent soil, is loaded by Based on Electro-hydraulic Loading Servo System.The image of coloured gravel and model test stake during image capturing system acquisition experiment.Utility model device is reasonable for structure, easy to operate, can be directly observed the displacement of stake and soil, causes the variation of negative friction of pile neutral point to provide a kind of effective means by ground preloading research.
Description
Technical field
The utility model belongs to geotechnical engineering field more particularly to a kind of simulation is caused by ground preloading in negative friction of pile
Property point variation experimental rig.
Background technology
Pile foundation negative friction force is widely present in pile foundation, and soft clay area is damaged because of negative friction due to pile foundation in recent years
Accident it is many, so the negative friction of stake has become one of the hot issue in pile foundation research.Soil consolidation settlement and
The soil body on pile foundation periphery can be made to settle with ground preloading, when sedimentation of the sedimentation of its pile peripheral earth more than stake, will produced
Raw negative friction.The transfer point of pile-side negative friction and positive friction, i.e. Pile Soil relative displacement are at 0, are exactly the neutral point of stake
Position.Analysis and calculating to the negative friction of stake are very the key links in Design of Foundation, and the depth of neutral point and
Position is then to determine the important parameter of negative friction of pile size.
The development of artificial synthesized transparent soil material makes transparent soil test field also extensive use in geotechnical engineering.It is artificial to close
It is made of with the pore-fluid with respective indices of refraction transparent soil particle at transparent soil, light wherein can that refraction does not occur
To pass through, so being transparent.Many scholars and scientific research personnel will melt using miscella or calcium bromide solution as pore liquid
Fused quartz, the materials such as silica gel have made transparency height as soil particle, and very close " transparent of physical property sand
Soil ".This just creates condition to observe the visual inspection of soil body internal deformation or seepage flow.
The empirical method of the determination stake neutral point position provided in existing pile foundation specification is inclined in many Practical Projects
Difference is larger；It is less for the displacement field research of soil around pile and stake when by influences such as preloadings；Conventional research negative friction of pile
Experiment plug-in type test method mostly used for the determination of neutral point position, but the mistake that earth pressure gauge and axle power meter etc. are brought
Difference it is uncontrollable, and can not directly obtain stake with soil overall deformation and settlement law, not enough clearly with intuitively.Therefore carry out
The experiment of neutral point position when accordingly for stake by negative friction just has a very important significance.
Invention content
In order to correct to the empirical method determined for neutral point position in specification, overcome routine test it is not intuitive enough,
The defects of plug-in type test method error is uncontrollable, it is negative that the utility model provides stake in the case of one kind can be used for simulating ground preloading
The experimental rig of frictional resistance neutral point variation, the device can control load, ground settlement, surface subsidence rate, soil layer
Permeability, by coloured gravel and stake side mark to obtain soil around pile different depth sedimentation and Pile Soil relative displacement in determination
Property point change in location.
Technical solution adopted by the utility model to solve its technical problems is：A kind of simulate causes stake to be born by ground preloading
The experimental rig of frictional resistance neutral point variation, which includes cylindrical model case, ground loading system and image capturing system；
The cylindrical model case includes cup dolly and the cylindrical transparent side wall glass that is fixed on cup dolly；The cylinder
Transparent glass sidewall bottom is equipped with osculum；Transparent soil is filled in the cylindrical model case, is buried in the different depth of transparent soil
If the coloured gravel being arranged symmetrically, the model test stake of transparent soil is inserted into the middle setting of cylindrical model case；The ground
Loading system includes holder, reaction beam, distribution beam, Based on Electro-hydraulic Loading Servo System and the load plate being covered on transparent soil, institute
Load plate center is stated to be provided with and the matched through-hole of model test stake size；The reaction beam is horizontally fixed on holder；The electricity
On liquid servo loading system support reaction beam, under connect distribution beam, transmit the force to distribution beam；Load plate is supported under the distribution beam, it will
Power passes to load plate, simulates preloading；Described image acquisition system collection model test pile and coloured gravel are in preloading
Change in displacement image.
Further, the model test stake is made of organic PC pipes；The transparent soil is configured by quartz sand and miscella
It forms
Further, the reaction beam is bolted on holder, can adjust height by bolt.
Further, the osculum is equipped with the piston of different infiltration coefficients, to change its drainage condition.
Further, described image acquisition system includes at least two high-definition digitals being arranged on the outside of cylindrical model case
Video camera.
The utility model has the beneficial effects that：
1, it is placed in transparent soil as the observation object of the sedimentation of the soil body using coloured gravel in the utility model, it can be from dress
It sets outer direct viewing to be settled by soil layer when preloading to soil around pile, altitude scale of the control calibration on cylindrical glass can
Intuitively carry out qualitative analysis.
2, for the confirmation of neutral point position judged by the relative displacement of coloured gravel and stake in the utility model
, quantitative analysis is carried out by the image that is acquired to image processing apparatus, without any plug-in type experimental rig such as earth pressure gauge,
Axle power meter etc. enormously simplifies operation and error smaller.
3, the material and surface roughness of model test stake oneself can be adjusted in the utility model, and organic PC pipe surfaces pass through
The polishing of sand paper forms the different contact surface of roughness.
4, Based on Electro-hydraulic Loading Servo System can be simulated not with control load, displacement and loading speed in the utility model
The case where under the conditions of same preloading.
5, the drainage condition of soil can be controlled in the utility model using the piston of different permeability.
Description of the drawings
Fig. 1 is experimental provision side view and coloured gravel along height placement figure；
Fig. 2 is that coloured gravel arranges vertical view；
Fig. 3 is draining hole and piston figure；
In figure：Cup dolly 1；Transparent native 2；Cylindrical transparent side wall glass 3；Load plate 4；Model test stake 5；There is smalt
Gravel 6；Holder 7；Reaction beam 8；Bolt 9；Distribution beam 10；Based on Electro-hydraulic Loading Servo System 11；Osculum 12；Image capturing system 13；
Computer 14；Piston 15.
Specific implementation mode
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, the purpose of this utility model
It will be apparent from effect.
As shown in Figs. 1-3, a kind of simulation provided by the utility model causes negative friction of pile neutral point to become by ground preloading
The experimental rig of change, the device include cylindrical model case, ground loading system and image capturing system 13；
The cylindrical model case includes cup dolly 1 and the cylindrical transparent side wall glass that is fixed on cup dolly 1
3；3 bottom of cylindrical transparent side wall glass is equipped with osculum 12；Transparent native 2 are filled in cylindrical model case, not transparent native 2
With the embedded coloured gravel 6 being arranged symmetrically of depth, transparent native 2 model test stake is inserted into the middle setting of cylindrical model case
5；
The ground loading system includes holder 7, reaction beam 8, distribution beam 10, Based on Electro-hydraulic Loading Servo System 11 and covering
Load plate 4 on transparent native 2,4 center of load plate are provided with and the matched through-hole of 5 size of model test stake；Reaction beam 8 is horizontal solid
It is scheduled on holder 7；On Based on Electro-hydraulic Loading Servo System 11 support reaction beam 8, under connect distribution beam 10, transmit the force to distribution beam 10；Institute
Distribution beam is stated 10 times to load plate 4, is transmitted the force to load plate 4, is simulated preloading；
The change in displacement figure of 13 collection model test pile 5 of described image acquisition system and coloured gravel 6 in preloading
Picture, incoming computer 14 are analyzed；
Model test stake 5 is made of organic PC pipes；Transparent native 2 are configured by quartz sand and miscella；Electro-hydraulic servo adds
The load mode of loading system 11 includes command displacement and control load；Reaction beam 8 is fixed on by bolt 9 on holder 7, Neng Goutong
It crosses bolt 9 and adjusts height；Load plate 4 ensures transparent native 2 by uniform load using the poly (methyl methacrylate) plate of high rigidity；Osculum
12 are equipped with the piston 15 of different infiltration coefficients, to change its drainage condition.
The course of work of the utility model is：
The calibration of height is carried out outside cylindrical transparent side wall glass 3；Reaction beam 8 is increased to the position of appropriate work；
Image capturing system 13 is arranged on the outside of cylindrical model case；Transparent native 2 are configured in model casing, outside model test stake 5
It is to observe the sedimentation of pile body different location, model test stake 5 is pre-buried extremely if wall equidistantly does along depth direction and does mark
The depth of design, pile crown are higher by transparent native 2 slightly, ensure that load plate 4 can be inserted in pile crown, while the two of model test stake 5
Side is divided into several layers along depth direction by transparent native 2 etc., smalt gravel 6 is disposed in every layer of same high degree of symmetry, to reflect
Bright native 2 sedimentation；Load plate 4 is covered, initial pictures is recorded using image capturing system 13, is sent to computer 14 and carries out initially
The calibration of sedimentation and deformation；The piston 15 that different infiltration coefficients are chosen according to different test requirements documents blocks the simulation of osculum 12
Drainage condition；According to different test requirements documents, by Based on Electro-hydraulic Loading Servo System 11, control load and displacement are loaded respectively；
Multiple series of image information is obtained by the infiltration coefficient progress test of many times of change load, displacement, piston 15, imports computer 14；
Displacement around pile field can be obtained by being fitted the subsidence curve of coloured gravel 6；Count transparent native 2 every layer of native settling amount and model test
The settling amount of 5 marks of stake finds out sedimentation by comparison and mutually exists together as neutral point position.
Above-described embodiment is a kind of preferred version of the utility model, however is not to limit this practicality
It is novel.Those of ordinary skill in technical field can be in the case where not departing from the spirit and scope of the utility model
It makes a variety of changes and modification.Therefore all technical solutions for taking the mode of equivalent substitution or equivalent transformation to be obtained, all fall within
In the scope of protection of the utility model.
Claims (5)
1. a kind of simulation causes the experimental rig that negative friction of pile neutral point changes by ground preloading, which is characterized in that including circle
Cylindricality model casing, ground loading system and image capturing system (13)；The cylindrical model case includes cup dolly (1) and consolidates
The cylindrical transparent side wall glass (3) being scheduled on cup dolly (1)；Cylindrical transparent side wall glass (3) bottom is equipped with row
Water hole (12)；Transparent native (2) are filled in the cylindrical model case, the different depth in transparent native (2) is embedded to be arranged symmetrically
The model test stake (5) of transparent native (2) is inserted into coloured gravel (6), the middle setting of cylindrical model case；The ground load
System includes holder (7), reaction beam (8), distribution beam (10), Based on Electro-hydraulic Loading Servo System (11) and is covered in transparent native (2)
On load plate (4), load plate (4) center is provided with and the matched through-hole of model test stake (5) size；The reaction beam
(8) it is horizontally fixed on holder (7)；On the Based on Electro-hydraulic Loading Servo System (11) support reaction beam (8), under connect distribution beam (10),
Transmit the force to distribution beam (10)；Load plate (4) is supported under the distribution beam (10), transmits the force to load plate (4), simulates heap
It carries；The change in displacement figure of described image acquisition system (13) collection model test pile (5) and coloured gravel (6) in preloading
Picture.
2. the experiment that a kind of simulation according to claim 1 causes negative friction of pile neutral point to change by ground preloading fills
It sets, it is characterised in that：The model test stake (5) is made of organic PC pipes；Transparent native (2) are matched by quartz sand and miscella
It sets.
3. the experiment that a kind of simulation according to claim 1 causes negative friction of pile neutral point to change by ground preloading fills
It sets, it is characterised in that：The reaction beam (8) is fixed on by bolt (9) on holder (7), can be adjusted by bolt (9) high
Degree.
4. the experiment that a kind of simulation according to claim 1 causes negative friction of pile neutral point to change by ground preloading fills
It sets, it is characterised in that：The osculum (12) is equipped with the piston (15) of different infiltration coefficients, to change its drainage condition.
5. the experiment that a kind of simulation according to claim 1 causes negative friction of pile neutral point to change by ground preloading fills
It sets, it is characterised in that：Described image acquisition system (13) includes at least two high definition numbers being arranged on the outside of cylindrical model case
Code video camera.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820093406.2U CN207730580U (en) | 2018-01-19 | 2018-01-19 | A kind of simulation is caused the experimental rig of negative friction of pile neutral point variation by ground preloading |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820093406.2U CN207730580U (en) | 2018-01-19 | 2018-01-19 | A kind of simulation is caused the experimental rig of negative friction of pile neutral point variation by ground preloading |
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| CN207730580U true CN207730580U (en) | 2018-08-14 |
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| CN201820093406.2U Expired - Fee Related CN207730580U (en) | 2018-01-19 | 2018-01-19 | A kind of simulation is caused the experimental rig of negative friction of pile neutral point variation by ground preloading |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389060A (en) * | 2019-07-01 | 2019-10-29 | 浙江大学 | A kind of bamboo joint pile-cement soil contact face sample preparation device and contact surface frictional behavior research shearing test device and test method |
| CN113514339A (en) * | 2021-04-08 | 2021-10-19 | 湖北交投江北东高速公路有限公司 | Indoor similar model test device for vertical bearing characteristic of single core-added pile |
-
2018
- 2018-01-19 CN CN201820093406.2U patent/CN207730580U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389060A (en) * | 2019-07-01 | 2019-10-29 | 浙江大学 | A kind of bamboo joint pile-cement soil contact face sample preparation device and contact surface frictional behavior research shearing test device and test method |
| CN113514339A (en) * | 2021-04-08 | 2021-10-19 | 湖北交投江北东高速公路有限公司 | Indoor similar model test device for vertical bearing characteristic of single core-added pile |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20180814 Termination date: 20220119 |