CN104790441A - Effective pile length researching simulation test box for variable parameter super-long pile - Google Patents
Effective pile length researching simulation test box for variable parameter super-long pile Download PDFInfo
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- CN104790441A CN104790441A CN201510195754.1A CN201510195754A CN104790441A CN 104790441 A CN104790441 A CN 104790441A CN 201510195754 A CN201510195754 A CN 201510195754A CN 104790441 A CN104790441 A CN 104790441A
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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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Abstract
The invention discloses an effective pile length researching simulation test box for a variable parameter super-long pile. The effective pile length researching simulation test box comprises a test pile, a bearing table, a bottom plate, a conduction column, springs, a jack, a flexible loader, a test box body, a partition plate, a counter-force beam and a counter-force frame, and further comprises an optical fiber sensor, soil stress detectors and a test pile body variation layer. By means of the effective pile length researching simulation test box, tests of a super-long pile foundation under certain control conditions can be completed; the action mechanism of the super-long pile foundation is explored, and the effective pile length phenomenon is researched; the test pipe body is a pile capable of being assembled and disassembled, the outer layer of the pile body is wrapped by the test pile body variation layer, various pile body parameters such as the diameter of the pile and the friction and resistance coefficients between the pile and soil, the diameter of the pile end and other parameters can be varied, and the mutual variation of various parameters between the super-long pile and the soil body can be basically covered. Theoretical guidance and test data support are provided for the design of the super-long pile foundation, and the application and practice risks of the super-long pile foundation are lowered.
Description
Technical field
The invention belongs to field of civil engineering, be specifically related to a kind of variable element super long pile effective length research simulation chamber.
Background technology
In Shanghai, the poor soft clay area of Tianjin, Foochow, Wuhan, the geological conditions such as Hangzhou, the use of super long pile is a large amount of and is necessary.Such as, world-wide trading center, the Shanghai world, Jin Mao Tower have employed the steel pipe pile that embedded depth reaches 80m, and Xi Ganghui mansion, Pu have employed the bored pile that embedded depth reaches 85m.The engineerings such as the Ocean Mansion in Efficiency in Buildings in Tianjin Area, Ao Dong mansion, Taida mansion, Ou Jiahua GuoMao Center mansion, Hua Xin mansion, Jin Huang mansion and rainbow bridge, Haihe Bridge all have employed the super-long filling pile being greater than 50m.30 2m diameter bores castinplace piles are connect, the long 77m of stake under the Bridge Main Pier cushion cap of lake, South Pacific, Huzhou.
Need to spend a large amount of manpowers owing to carrying out super long pile basis prototype test, material resources and time, the prototype test and research of especially carrying out multi-column pier foundation more because of site condition and other factors restriction and cannot carry out, at this moment model testing research have to be adopted, then be generalized in practical engineering application on the basis of model testing, the model testing of stake is the actual working state according to pile foundation, set up the model with prototype with similitude rule, by scientific instrument and equipment, Control experiment condition artificially, research pile foundation is in test that is a certain or stress deformation characteristic in some cases, pile foundation engineering technique research application design and the construction stage all occupy critical role.The theoretical research that it is not only pile foundation provides experimental data and testing and verification, and provides according to for engineering design and then instruct engineering practice.
" effective length " obtains the concern of engineering circles and academia as an experimental phenomena, and forefathers have done many useful experimental studies and theoretical research in this respect, but research point is not quite similar, and research technique method and theoretical analysis method are not identical yet.
Huzhou area of Zhejiang province is located in Northern Zhejiang area Taihu Lake basin, is typical soft clay area.Its weak soil has the features such as thickness is large, high-moisture, macrovoid ratio, low-intensity, high sensitivity high-compressibility, hypotonicity.Mostly the main method that the construction of soft clay area building is current is that long stake is passed through and the methods such as Soft Soil-composite Foundation reinforcing.Huzhou area of Zhejiang province builing industry develops rapidly in recent years, structure foundation Foundation Design is mainly based on single rigid pile such as drilled pile, tube-sinking cast-in-situ pile and Static Pressure Precast Piles, few in the application of building foundation engineering composite foundation, the application on super long pile basis is rare especially, more than main cause perform an analysis, therefore carry out about the test and application research on super long pile basis seems abnormal important.
Along with super long pile basis application development in engineering, the research on super long pile basis is also subject to day by day to the attention of scholar and engineers and technicians.Mainly concentrate in the calculating of bearing capacity and the research of settlement calculation method to the research on super long pile basis at present, it is mainly studied and can be divided into theoretical research and experimental study two aspects.Although Chinese scholars has carried out many useful discussions in theory on super long pile basis, and in conjunction with the engineering practice of China, propose some corresponding design and calculation methods.But, about indoor model test and the on-the-spot full scale test on super long pile basis, so far there is not been reported, especially super long pile basis king-pile, native load transfer law, stake-soil-bed course-cushion cap acting in conjunction mechanism and analytical method, pile-type and pile arrangement are on the impact etc. of overlength bearing behavior and sedimentation, all await dark people research.This problem is for existing composite foundation treatment Construction Condition, related documents is consulted on the basis of forefathers' research, analyze in conjunction with Huzhou area of Zhejiang province soil layer geological condition and correlation engineering follow-up study, carry out the simulating lab test Study and appliance research of weak soil super long pile basis, improve Huzhou area of Zhejiang province super long pile basic engineering construction status with this, promote the application development on weak soil super long pile basis.
Carry out the test and application research on super long pile basis, there are important theory significance, strong engineering background and good economic and social benefits.
Summary of the invention
An object of the present invention is the indoor model test by super long pile basis, research super long pile basis king-pile, native load transfer law, stake-soil-bed course-cushion cap acting in conjunction mechanism and analytical method, pile-type and pile arrangement, on problems such as the impacts of overlength bearing behavior and sedimentation, provide a kind of variable element super long pile effective length to study simulation chamber.
The invention provides a kind of variable element super long pile effective length research simulation chamber, comprise test pile, cushion cap, base plate, conductive post, spring, jack, flexible loader, chamber, dividing plate, reaction beam and reaction frame, also comprise Fibre Optical Sensor, soil stress meter and test pile body change layer; Described chamber top outer installs described jack, below described chamber inside top, described flexible loader is installed, below described flexible loader, described base plate is installed, described cushion cap is installed by described base plate central authorities, the described conductive post of flexible loader is mounted across above described cushion cap, described conductive post upper end connects described jack, and the described jack other end connects described reaction beam; Described test pile is arranged on below described cushion cap, tests pile body change layer described in described test pile outer layer covers; At the bottom of described chamber, described dividing plate is installed, under described dividing plate, described spring is installed; Landfill soil layer in described chamber, in soil layer, different depth places described soil stress meter; Have surface-based described reaction frame outside described chamber, described reaction beam is installed in described reaction frame upper end.
Further, described test pile body change layer is lubricating layer or exasperate adhesive plaster winding layer.
Further, described test pile bottom is also provided with enlarged footing.
Further, it is inner that described Fibre Optical Sensor is arranged on described test pile, the external computer of described Fibre Optical Sensor.
Further, described flexible loader is ring-shaped rubber leather sheath, filled with gas.
Further, described chamber sidewall is provided with gutter, and described gutter one end in chamber is provided with filter screen.
Beneficial effect of the present invention is: variable element super long pile effective length research simulation chamber of the present invention, is a kind of Novel ultralong pile foundation simulated test instrument, can completes the super long pile basic test of certain controlled condition; The mechanism of action on super long pile basis is explored, and effective length phenomenon is studied; The present invention breaks through the field condition complexity that super long pile Foundation Fieldbus field original position load test stabilization exists, existing experimental facilities means cannot reflect composite foundation practical working situation comprehensively, and existing on-the-spot single pile mattress layer experimental study limitation, design for super long pile basis provides theoretical direction and experimental data support, reduces super long pile base application and puts into practice risk.
Simulant building thing structural element composition of the present invention and stressed load transmission, wherein conductive post, cushion cap, base plate reduces in proportion according to structural element, and become an entirety by reinforced concrete spliced, wherein all kinds stake can with cushion cap free splicing, jack applies counter-force load to conductive post by reaction beam, load is passed to simulated test stake by conductive post again, flexible loader is rubber sleave, by aerating pressurization, rubber case is expanded to load to base plate and soil layer, at jack and flexible loader under mutual and acting in conjunction, simulant building thing structure foundation basic stress, fiber optic sensor is embedded with in test pile, stress box is had in soil, test super long pile respectively, with different soil force-bearing situation.Under chamber base spacer, spring is housed, spring can be installed and removed, and the soil layer of different compressibilty simulated by different-stiffness spring, can simulate the following layer compression situation of super long pile.Test pile body is detachable stake, and outer layer covers test pile body change layer, can change various pile parameter, as the parameter such as frictional resistance coefficient, stake end diameter between stake diameter, stake soil, substantially can contain the mutual change of many kinds of parameters between super long pile and the soil body.
Accompanying drawing explanation
Figure 1 shows that variable element super long pile effective length of the present invention research simulation chamber structure chart;
Figure 2 shows that test pile outer layer covers lubricating layer schematic diagram of the present invention;
Figure 3 shows that test pile outer layer covers exasperate adhesive plaster winding layer schematic diagram of the present invention;
Figure 4 shows that enlarged footing schematic diagram is installed in test pile lower end of the present invention.
Detailed description of the invention
Hereafter will describe the specific embodiment of the invention in detail in conjunction with concrete accompanying drawing.It should be noted that the combination of technical characteristic or the technical characteristic described in following embodiment should not be considered to isolated, they can mutually be combined thus be reached better technique effect.In the accompanying drawing of following embodiment, the identical label that each accompanying drawing occurs represents identical feature or parts, can be applicable in different embodiment.
Figure 1 shows that variable element super long pile effective length of the present invention research simulation chamber structure chart, as shown in Figure 1, variable element super long pile effective length research simulation chamber of the present invention, comprise test pile 1, cushion cap 2, base plate 3, conductive post 4, spring 5, jack 6, flexible loader 7, chamber 8, dividing plate 9, reaction beam 10 and reaction frame 11, also comprise Fibre Optical Sensor 12, soil stress meter 13 and test pile body change layer 14.
Chamber 8 top outer installs jack 6, and install flexible loader 7 below chamber 8 inside top, flexible loader 7 is ring-shaped rubber leather sheath, filled with gas.Mounting base 3 below flexible loader 7, the central installation platform 2 of base plate 3, is mounted across the conductive post 4 of flexible loader 7 above cushion cap 2, conductive post 4 upper end connects jack 6, and jack 6 other end connects reaction beam 10.
Test pile 1 is arranged on below cushion cap 2, test pile 1 outer layer covers test pile body change layer 14, the inner installing optical fibres sensor 12 of test pile 1, the external computer of Fibre Optical Sensor 12.
Dividing plate 9 is installed at chamber 8 end, dividing plate 9 times mounting spring 5; Landfill soil layer 17 in chamber 8, in soil layer 17, different depth places soil stress meter 13; Chamber 8 sidewall is provided with gutter 15, and gutter 15 one end in chamber is provided with filter screen 16.
Have surface-based reaction frame 11 outside chamber 8, reaction beam 10 is installed in reaction frame 11 upper end.
As shown in Figures 2 and 3, test pile 1 outer field test pile body change layer 14 can be lubricating layer 18 or exasperate adhesive plaster winding layer 19.
As shown in Figure 4, test pile 1 bottom is also provided with enlarged footing 20.
Variable element super long pile effective length research simulation chamber of the present invention, is a kind of Novel ultralong pile foundation simulated test instrument, can completes the super long pile basic test of certain controlled condition; The mechanism of action on super long pile basis is explored, and effective length phenomenon is studied; The present invention breaks through the field condition complexity that super long pile Foundation Fieldbus field original position load test stabilization exists, existing experimental facilities means cannot reflect composite foundation practical working situation comprehensively, and existing on-the-spot single pile mattress layer experimental study limitation, design for super long pile basis provides theoretical direction and experimental data support, reduces super long pile base application and puts into practice risk.
Simulant building thing structural element composition of the present invention and stressed load transmission, wherein conductive post 4, cushion cap 2, base plate 3 reduces in proportion according to structural element, and become an entirety by reinforced concrete spliced, wherein all kinds stake can with cushion cap 2 free splicing, jack 6 applies counter-force load to conductive post 4 by reaction beam 10, load is passed to simulated test stake 1 by conductive post 4 again, flexible loader 7 is rubber sleave, by aerating pressurization, rubber case is expanded to load to base plate 3 and soil layer 17, at jack 6 and flexible loader 7 under mutual and acting in conjunction, simulant building thing structure foundation basic stress, test pile 1 li is embedded with fiber optic sensor 12, stressometer 13 is had in soil, testing experiment stake 1 and different soil 17 force-bearing situation respectively.Chamber 8 base spacer is equipped with spring 59 times, and spring 5 can be installed and removed, and the soil layer 17 of different compressibilty simulated by different-stiffness spring 5, can simulated test stake less than 1 soil layer 17 compressed state.Test pile 1 body is detachable stake, and outer layer covers test pile body change layer 14, can change various pile parameter, as the parameter such as frictional resistance coefficient, stake end diameter between stake diameter, stake soil, substantially can contain the mutual change of many kinds of parameters between test pile 1 and the soil body.
Although give some embodiments of the present invention, it will be understood by those of skill in the art that without departing from the spirit of the invention herein, can change embodiment herein.Above-described embodiment is exemplary, should using embodiment herein as the restriction of interest field of the present invention.
Claims (6)
1. a variable element super long pile effective length research simulation chamber, comprise test pile, cushion cap, base plate, conductive post, spring, jack, flexible loader, chamber, dividing plate, reaction beam and reaction frame, it is characterized in that, also comprise Fibre Optical Sensor, soil stress meter and test pile body change layer; Described chamber top outer installs described jack, below described chamber inside top, described flexible loader is installed, below described flexible loader, described base plate is installed, described cushion cap is installed by described base plate central authorities, the described conductive post of flexible loader is mounted across above described cushion cap, described conductive post upper end connects described jack, and the described jack other end connects described reaction beam; Described test pile is arranged on below described cushion cap, tests pile body change layer described in described test pile outer layer covers; At the bottom of described chamber, described dividing plate is installed, under described dividing plate, described spring is installed; Landfill soil layer in described chamber, in soil layer, different depth places described soil stress meter; Have surface-based described reaction frame outside described chamber, described reaction beam is installed in described reaction frame upper end.
2. variable element super long pile effective length research simulation chamber as claimed in claim 1, it is characterized in that, described test pile body change layer is lubricating layer or exasperate adhesive plaster winding layer.
3. variable element super long pile effective length research simulation chamber as claimed in claim 1, it is characterized in that, described test pile bottom is also provided with enlarged footing.
4. the variable element super long pile effective length research simulation chamber as described in any one of claim 1-3, it is characterized in that, it is inner that described Fibre Optical Sensor is arranged on described test pile, the external computer of described Fibre Optical Sensor.
5. variable element super long pile effective length research simulation chamber as claimed in claim 4, it is characterized in that, described flexible loader is ring-shaped rubber leather sheath, filled with gas.
6. variable element super long pile effective length research simulation chamber as claimed in claim 5, it is characterized in that, described chamber sidewall is provided with gutter, and described gutter one end in chamber is provided with filter screen.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106480910A (en) * | 2016-12-09 | 2017-03-08 | 广州市建筑科学研究院有限公司 | The device and method that a kind of simulation is acted on test pile end different bearer |
| CN107059955A (en) * | 2017-04-05 | 2017-08-18 | 河南科技大学 | A kind of fixation and loading system for being used to simulate preferable single pile response |
| CN108612134A (en) * | 2018-04-26 | 2018-10-02 | 浙江大学宁波理工学院 | It is quiet to bore the device and method for taking root in pile load transport mechanism model test |
| CN108643249A (en) * | 2018-05-21 | 2018-10-12 | 东南大学 | Experimental provision and its assemble method for studying stake-rock interfacial failure mechanism |
| CN108951724A (en) * | 2018-07-24 | 2018-12-07 | 湖北工业大学 | Energy pile test monitoring system and test method |
| CN109060532A (en) * | 2018-07-30 | 2018-12-21 | 中国地质大学（武汉） | A kind of karst area ultra-long pile buckling stability indoor model experiments device and method |
| CN111609952A (en) * | 2020-05-28 | 2020-09-01 | 机械工业勘察设计研究院有限公司 | Calibration device and method for testing pile foundation internal force by line measurement method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106480910A (en) * | 2016-12-09 | 2017-03-08 | 广州市建筑科学研究院有限公司 | The device and method that a kind of simulation is acted on test pile end different bearer |
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| CN108951724A (en) * | 2018-07-24 | 2018-12-07 | 湖北工业大学 | Energy pile test monitoring system and test method |
| CN109060532A (en) * | 2018-07-30 | 2018-12-21 | 中国地质大学（武汉） | A kind of karst area ultra-long pile buckling stability indoor model experiments device and method |
| CN109060532B (en) * | 2018-07-30 | 2023-09-15 | 中国地质大学（武汉） | Karst area ultra-long pile buckling stability indoor model experimental device and method |
| CN111609952A (en) * | 2020-05-28 | 2020-09-01 | 机械工业勘察设计研究院有限公司 | Calibration device and method for testing pile foundation internal force by line measurement method |
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