CN109883837A - A kind of the Model Pile tester and its test method of controllable soil temperature - Google Patents
A kind of the Model Pile tester and its test method of controllable soil temperature Download PDFInfo
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- CN109883837A CN109883837A CN201910222516.3A CN201910222516A CN109883837A CN 109883837 A CN109883837 A CN 109883837A CN 201910222516 A CN201910222516 A CN 201910222516A CN 109883837 A CN109883837 A CN 109883837A
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Abstract
The present invention relates to a kind of Model Pile tester of controllable soil temperature and its test methods, comprising: bottom plate, outer ring side plate, inner ring side plate, side plate temperature control tube assembly, top cover, stake model；Side plate temperature control tube assembly is set in annular space between outer ring side plate, inner ring side plate, and the side plate temperature control tube assembly includes: multiple cricoid side plate temperature control tubes disposed in parallel from top to bottom；Heat-insulating shield is additionally provided between each layer side plate temperature control tube in annular space；Independent inlet tube and outlet tube are respectively connected on the outside of each side plate temperature control tube, the inlet tube and outlet tube are connect with circulation fluid system, and the temperature of the circulation fluid in each layer side plate temperature control tube is adjusted by circulation fluid system.Using Model Pile tester of the invention and its test method, the soil body can be simulated in different temperatures and change the situation under path, the stake soil mechanics behavior under said circumstances is studied.
Description
Technical field
The invention patent relates to During Geotechnical Tests technical field, in particular to the Model Pile of a kind of controllable soil temperature is tested
Instrument and its test method.
Background technique
At this stage, the soil body is appeared as under temperature action for a research hotspot.
Such as: temperature change is considered as a kind of load by CN101430318A, and it discloses a kind of temperature-control consolidation pressure chamber systems
System.The side wall of temperature-control consolidation pressure chamber is the cavity type structure made by stainless steel, pressure chamber tubular electric hot plate embedment pressure room
In side wall, the both ends of the resistance wire of pressure chamber's tubular electric hot plate are connect with temperature regulator.Pressure chamber's electroheat pair is mounted on pressure
Ceiling covers, and one end is placed in water-filled pressure chamber, and output end is connect with temperature regulator.Sample water drain, pore water
Amount of pressure test tube, ambient pressure connecting tube are all made of stainless steel material production, and interlude is helicoidal structure, and helicoidal structure is set
Enter in the constant water container of temperature.The sample water drain drawn from the constant water container of temperature becomes pipe with body and connect, pore water pressure
It measures pipe to connect with measuring pore water pressure system, ambient pressure connecting tube is connect with voltage regulation of voltage regulation system.It can satisfy change
Change the needs that temperature load acts on lower saturated soil sample hot consolidation test, the hot consolidation of Accurate Determining saturated soil sample can be used to
Deflection.Above-mentioned apparatus is main
For another example: CN109270109A discloses a kind of soft clay hot consolidation experimental model device, including pedestal, top cover, interior
Drum and outer drum, inner circle casing connect in outer drum, and pedestal is arranged in the upper end setting top cover of interior drum and outer drum, lower end,
Pedestal and top cover are bolted using at least three anchor poles around the outer drum, and drain bar is provided in interior drum, interior
It is wound with conductor wire in outer wall of barrel, iron staff is provided in drain bar, interior drum inner upper end is provided with piston, the center of piston
With with the matched grooving of drain bar, grooving top have wire through-hole, grooving cover on drain bar and can move up and down with
Soil sample in compressing in drum, iron staff and conductor wire are separately connected power positive cathode, and surrounding between interior drum for piston is formed
Atmospheric pressure cavity offers gas injection aperture on bottom cover, and booster pump is connect by pipeline with gas injection aperture, and to atmospheric pressure cavity inflation to simulate
Preloading pressure.The device is able to solve gas leakage under vacuum preloading, vacuum degree reduces, husky well surrounding soil is heated in thermal consolidation
Non-uniform problem.
For another example: 106596297 A of CN discloses a kind of energy pile Pile Soil interface mechanics behavioral trait testing equipment and side
Method, including frame, vertical pressure loading system, Pile Soil interface simulation system, loop temperature-control system, water filling drainage system and
Data collection system.Testing equipment and method of the invention passes through the temperature of loop temperature-control system regulation concrete hollow cylinder,
The heat exchanging process of real simulation energy pile.Using water filling drainage system, control soil sample degree of saturation, simulation saturation soil sample be not
The change procedure of soil around pile and Pile Soil interface normal stress pore water pressure under the conditions of synthermal.Outside concrete hollow cylinder
Wall arranges related sensor, collecting pile-Soil Interface normal pressure and temperature data.It is passed by transmission rod axial force sensor and displacement
Sensor, collecting pile-Soil Interface frictional force and relative shear deformation.It is hot and cold ringing by the acquisition and analysis of data
The research of the mechanical behavior feature and its evolutionary process at lower Pile Soil interface provides test data.
108981819 A of CN discloses a kind of system and method for testing energy pile temperature and stress distributions, including model list
Member, temperature loading unit and measuring unit；Model unit includes being contained with the test soil body case of soil and setting in test soil
In energy pile；Temperature loading unit includes the water tank being sequentially communicated, water pump, temperature cycles control machine and heat exchanger tube, heat exchanger tube
It is set to inside energy pile, and the both ends of heat exchanger tube are connected to temperature cycles control machine, temperature cycles control machine and water tank connect
It is logical；Measuring unit includes being uniformly arranged on several thermocouples, several earth pressure gauges, several pore waters of test in soil
Pressure gauge, several foil gauges being arranged on the outer wall of energy pile and the displacement meter being arranged on the pile cover of energy pile.This hair
The system and method for bright test energy pile temperature and stress distributions can accurately measure the temperature and stress distributions of energy pile.
It was found from above-mentioned research: the factor that should be paid attention in temperature factor.
However, research now is in the following areas or blank:
1) soil body is under spring, summer, autumn and winter isometric time-temperature circulation, side friction and bearing capacity of this species diversity to pile foundation
What has influence；
2) when pile foundation length is longer, the Temperature Distribution of soil layer differs greatly, and under these conditions, soil temperature variation
Again can side friction on pile foundation and bearing capacity what has influence；
3) for energy stake, the long-term heat supply of pile foundation and refrigeration are used alternatingly, and pile foundation itself is also at continuous heat
In swollen shrinkage, however above-mentioned energy stake, influence of the soil body under long-time temperature cycles is not considered, does not consider practical soil body sheet yet
The temperature difference of body influences.
Above-mentioned 3 factors, do not occur targetedly simulation test research device also；On solving
State problem.
Summary of the invention
The object of the present invention is to provide a kind of Model Pile tester of controllable soil temperature and its test methods, with simulation
Soil body situation under temperature change path.
A kind of Model Pile tester of controllable soil temperature, comprising: bottom plate, outer ring side plate, inner ring side plate, side plate temperature
Keyholed back plate component, top cover, stake model；
Outer ring side plate, inner ring side plate are mounted in bottom plate, and top cover is connect with outer ring side plate；
The soil body is filled between inner ring side plate, and stake model is placed in the soil body；
Bottom outer ring side plate, inner ring side plate level cross-sectionn be circle, and the two center of circle is same point；In outer ring side
Side plate temperature control tube assembly is set in annular space between plate, inner ring side plate, and the side plate temperature control tube assembly includes: from top to bottom
Multiple cricoid side plate temperature control tubes disposed in parallel；
Heat-insulating shield is additionally provided between each layer side plate temperature control tube in annular space；The outside of each side plate temperature control tube
It is respectively connected with independent inlet tube and outlet tube, the inlet tube and outlet tube are connect with circulation fluid system, pass through circulation
Liquid system adjusts the temperature of the circulation fluid in each layer side plate temperature control tube；
Further, the protruding first level loop connecting plate of outer ring side plate, between outer ring side plate and inner ring side plate
Top area is also fixedly connected with the second horizontal endless connecting plate；
The first level loop connecting plate, the second horizontal endless connecting plate are provided with threaded hole；It is set on top cover
It is equipped with the threaded hole mutually coped with the threaded hole of the first level loop connecting plate, the second horizontal endless connecting plate；
Top cover and first level loop connecting plate, the second horizontal endless connecting plate, by corresponding bolt hole, with
And bolt and nut component is fixed together；
The top cover temperature control tube assembly and soil body top strain adjustable plate are fixedly connected in the lower end of top cover；The top
Lid temperature control tube assembly links together with top cover, soil body top strain adjustable plate；The lower surface of soil body top strain adjustable plate is set
It is equipped with top-film；
The top cover temperature control tube assembly use may expand non-permeable film and be made；In the top cover temperature control of top cover temperature control tube assembly
Circulating liquid is passed through in pipe to realize that temperature, top cover temperature control tube assembly are that the top cover temperature control tube of multiple concentric circles is constituted.
Further, soil body top strain adjustable plate is provided centrally with hole, and in order to which neck ring passes through, neck ring is pressed in top
On portion's film, the interior side contacts in outside and the centre bore of soil body top strain adjustable plate；
Round thread hole is also offered on top cover, and hole pile pipe guidance pipe collar, stake are installed in above-mentioned round thread hole
Pipe guidance pipe collar is adapted to the stake diameter of stake model, and stake model sequentially passes through pile pipe guidance pipe collar and neck ring, subsequently into soil
In body.
Further, pile pipe guides the sliding pearl that is internally provided with of pipe collar, and sliding pearl contacts with stake model.
Further, further includes: permeable structure layer, drain valve, permeable structure layer bottom plate top and including being set to
It encloses between side plate, drainpipe is set in bottom plate, the region that drainpipe stretches out bottom plate is provided with drain valve；In permeable knot
The top of structure layer is provided with bottom film, and the inner surface of inner ring side plate is provided with side film.
Further, the soil body is arranged between bottom film, side film, is additionally provided with top-film on the top of the soil body；Bottom film,
Side film, top-film are all made of latex film.
Further, stake model top is connect with loading system, and loading system includes: gantry crane, power telescopic rod；At gantry
The crossbeam lower part hung is provided with mobile platform, and the lower part of mobile platform is fixedly installed dynamic telescopic rod, under power telescopic rod
End is provided with mounting hole, pile cover installation part is provided at the top of the stake model, pile cover installation part is threadingly attached to power
In the mounting hole of the lower end of telescopic rod.
Further, the distribution of side plate temperature control tube uses: the form that top is close and caliber is thin, lower part is dredged and caliber is thick.
Further, material identical with heat-insulating shield, inner ring side are also used within the scope of the corresponding heat-insulating shield of inner ring side plate
The other parts of plate use thermally conductive/cold material.
Further, inner ring side plate, outer ring side plate, heat-insulating shield link into an integrated entity.
Further, outer ring side plate uses heat-insulating material, and in outer ring, side plate is provided with several liquid-passing holes, is used to for inlet tube
And outlet tube passes through.
Further, the bottom temperature that the bottom temperature control tube of several concentric circles is constituted is embedded in permeable structure layer or bottom plate
Keyholed back plate component, bottom temperature control tube assembly and circulation fluid system connectivity.
Further, a model temperature control tube assembly is internally provided in stake model；Stake model temperature control tube assembly and circulation fluid
System connectivity.
A kind of working method of the Model Pile tester of controllable soil temperature comprising following steps:
First, the soil body is embedded: the placement in layers soil body buries temperature sensor according to preset height in the soil body, to survey
Measure temperature Stress Field Distribution in the soil body；It is additionally provided with settlement sensor on soil body top, to measure the sedimentation situation on native surface；
Second, after the completion of the soil body fills, top cover is mounted on inner ring side plate, on the side plate of outer ring；
Third is opened top cover temperature control tube assembly, the unlatching of side plate temperature control tube assembly, by control system so that soil body temperature
Degree field is preset initial temperature field；
4th, piling: using the process of static press piling, mobile platform is adjusted, so that the tip perpendicular alignmnet stake of stake model
Position center, restarts power telescopic rod, stake model is depressed into predetermined depth；
5th, after the completion of piling, control system sends instruction, adjusts top cover temperature control tube assembly, side plate temperature control tube assembly, makes
The temperature paths for obtaining the soil body are run according to preset operating condition, finally carry out static load test.
Further, after piling, the drain valve during testing is always on；After the completion of piling, pass through sash weight control
Pile body verticality processed；After piling, pile-soil model is stood one to testing again after two weeks.
Further, further include following test equipment in test:
Foil gauge is posted on the surface of stake, to measure strain of the pile foundation at different depth, and then obtains pile foundation in difference
Stress intensity under depth；
In the embedded soil body, miniature earth pressure gauge is buried on the surface of stake, to measure Pile Soil normal stress；
Miniature earth pressure gauge is also buried in the bottom of stake, to measure stake end stress；
A pressure sensor is laid, between pile cover and power telescopic rod to measure pile top load；
It is additionally provided with displacement sensor on the top of stake model, to measure the displacement at the top of stake model.
A kind of working method of the Model Pile tester of controllable soil temperature comprising following steps:
First, the soil body is embedded: the placement in layers soil body buries temperature sensor according to preset height in the soil body, to survey
Measure temperature Stress Field Distribution in the soil body；
It is additionally provided with settlement sensor on soil body top, to measure the sedimentation situation on native surface；
Second, after the completion of the soil body fills, top cover is mounted on inner ring side plate, on the side plate of outer ring；
Third is opened top cover temperature control tube assembly, the unlatching of side plate temperature control tube assembly, by control system so that soil body temperature
Degree field is preset initial temperature field；
4th, piling: using the process of static press piling, mobile platform is adjusted, so that the tip perpendicular alignmnet stake of stake model
Position center, restarts power telescopic rod, stake model is depressed into predetermined depth；After piling, drain valve is opened；
5th, after the completion of piling, control system sends instruction, adjusts top cover temperature control tube assembly, side plate temperature control tube assembly, bottom
Portion's temperature control tube assembly, the temperature of every temperature control tube in stake model temperature control tube assembly, so that the temperature road of the soil body and stake model
Diameter is run according to preset operating condition, finally carries out static load test.
By adopting the above technical scheme, compared with prior art, advantage includes the following.
First, the design of side plate temperature control tube assembly is proposed, the side plate temperature control tube group constituted based on multilayer side plate temperature control tube
Part can be layered and heat/cool down to the temperature of the soil body.
Second, side plate temperature control tube is given using " formal distribution that top is close and caliber is thin, lower part is dredged and caliber is thick ", is
The design proposed based on the soil temperature regularity of distribution.
Third gives inner ring side plate region corresponding with heat-insulating shield and also uses heat-insulating material, i.e., inner ring side plate is along high
It spends direction to use: thermally conductive/coolant-heat-insulating material, the design alternateed.
4th, by side plate temperature control tube component, bottom temperature control tube assembly, top cover temperature control tube assembly, to the temperature of the soil body
Degree field is finely controlled.
5th, the working method in the temperature field for how changing the soil body of tester is expounded.
Detailed description of the invention:
Fig. 1: the design diagram of the Model Pile tester of the controllable soil temperature of embodiment one.
Fig. 2: the side plate temperature control tube of embodiment one and the connection schematic diagram of circulation fluid system.
Fig. 3: the design diagram of the top cover temperature control tube assembly of embodiment one.
Fig. 4: the gantry crane of embodiment one and the connection schematic diagram of power telescoping member, stake model.
Fig. 5: each layer side plate temperature control tube of embodiment two and the design diagram of heat-insulating shield.
Fig. 6: the design diagram of the inner ring side plate of embodiment three, outer ring side plate and heat-insulating shield.
Fig. 7: the design diagram of the Model Pile tester of the controllable soil temperature of example IV.
Fig. 8: the design diagram of the stake model temperature control tube assembly of the stake model of embodiment five.
Fig. 9: the connection design drawing of control system and sensor, the circulatory system etc. of the invention.
Specific embodiment
Embodiment one: as shown in Figs 1-4, a kind of Model Pile tester of controllable soil temperature, comprising: bottom plate 1, outer
Enclose side plate 2, inner ring side plate 3, side plate temperature control tube assembly 4, permeable structure layer 5, drain valve 6, top cover 7 (its cross section be circle),
Stake model guides pipe collar 8, top cover temperature control tube assembly 9, neck ring 10, stake model 13；
Side portion structure is as follows:
Bottom plate 1 is interconnected and fixed with outer ring side plate 2, inner ring side plate 3；Outer ring side plate 2, the level of inner ring side plate 3 are horizontal
Section is circle, and the two center of circle is same point；
Side plate temperature control tube assembly 4 is arranged in annular space between outer ring side plate 2, inner ring side plate 3, and (side plate is using double-deck
Effect be, outer ring side plate 2 use heat-insulating material, prevent the influence of external heat；It is placed by the design of double-layer structure
Side plate temperature control tube assembly 4), the side plate temperature control tube assembly 4 includes: multiple cricoid side plate temperature controls disposed in parallel from top to bottom
Pipe 4-1；
Heat-insulating shield 4-2 is additionally provided between each layer side plate temperature control tube 4-1 in annular space；Each side plate temperature control tube
Independent inlet tube 11-1 and outlet tube 11-2, the inlet tube 11-1 and outlet tube 11-2 are respectively connected on the outside of 4-1
It is connect with circulation fluid system 11, is provided with micropump on inlet tube 11-1；
Temperature (each layer side plate temperature control of the circulation fluid in each layer side plate temperature control tube 4-1 is adjusted by circulation fluid system 11
The temperature of circulation fluid in pipe 4-1 can be adjusted, and the difference of different depth soil temperature is realized with this)；
In outer ring, side plate 2 is provided with several liquid-passing holes, for passing through for inlet tube 11-1 and outlet tube 11-2.
Bottom structure design is as follows:
Permeable structure layer 5 bottom plate 1 top and be set between inner ring side plate 3, in bottom plate be arranged draining
Pipe is provided with drain valve 6 in the region that drainpipe stretches out bottom plate；
The top of permeable structure layer 5 is provided with bottom film, the inner surface of inner ring side plate 3 is provided with side film.
Top structure is as follows:
The protruding first level loop connecting plate of outer ring side plate 2, the top between outer ring side plate 2 and inner ring side plate 3
Region is also fixedly connected with the second horizontal endless connecting plate；The first level loop connecting plate, second horizontal endless connect
Fishplate bar is provided with threaded hole；It is provided on top cover 7 and is connect with the first level loop connecting plate, second horizontal endless
The threaded hole that the threaded hole of plate is mutually coped with；
Top cover 7 and first level loop connecting plate, the second horizontal endless connecting plate, by corresponding bolt hole,
And bolt and nut component is fixed together；
The top cover temperature control tube assembly 9 is fixedly connected in the lower end of top cover 7 and soil body top strain adjustable plate 12 (is used
To realize that the dispersion to soil body upper pressure is transmitted)；The top cover temperature control tube assembly 9 and top cover 7, soil body top strain adjustable plate
12 link together；The lower surface of soil body top strain adjustable plate 12 is provided with top-film；
The use of top cover temperature control tube assembly 9 may expand non-permeable film and be made；In the top cover temperature of top cover temperature control tube assembly 9
Circulating liquid is passed through in keyholed back plate to realize that temperature, top cover temperature control tube assembly 9 are that the top cover temperature control tube of multiple concentric circles is constituted；
Influence of the top cover temperature control tube assembly 9 in addition to that can be used to simulate soil body upper temp, by adjusting circulating liquid
Flow, the size of adjustable top cover temperature control tube assembly 9, so adjust soil body top strain adjustable plate 12 displacement, i.e., in fact
Now to the adjusting of soil body top stress.
Soil body top strain adjustable plate 12 is provided centrally with hole, and in order to which neck ring 10 passes through, neck ring 10 is pressed in top
On portion's film, the interior side contacts in outside and the centre bore of soil body top strain adjustable plate 12；
Round thread hole is also offered on top cover 7, and pile pipe guidance pipe collar 8 in hole is installed in above-mentioned round thread hole
(by installing the size of the internal diameter of different pipe collars 8, the stake model that can be adapted for piles with different diameter passes through), pile pipe guides pipe collar 8
It is adapted to the stake diameter of stake model 13 and (prevents a model from tilting during piling), stake model 13 sequentially passes through pile pipe guidance pipe collar
8 and neck ring 10, subsequently into the soil body.
Further, pile pipe guides the sliding pearl that is internally provided with of pipe collar 8, and sliding pearl contacts with stake model 13.
The soil body is arranged between bottom film, side film, is additionally provided with top-film on the top of the soil body；Further, bottom film,
Side film, top-film are all made of latex film, to reduce the frictional force that the soil body is contacted with instrument edge；Meanwhile the effect of above-mentioned film
Also for reduction soil temperature by external influence.
13 top of stake model is connect with loading system, and loading system includes: gantry crane 14, power telescopic rod 15；At gantry
The crossbeam lower part for hanging 14 is provided with mobile platform 16, and dynamic telescopic rod 15 is fixedly installed in the lower part of mobile platform, and power is flexible
The lower end of bar 15 is provided with mounting hole, and the top of the stake model 13 is provided with pile cover installation part, and pile cover installation part passes through screw thread
It is connected in the mounting hole of the lower end of power telescopic rod 15.
Motor-driven jack or hydraulic mechanism etc. can be used to provide power in power telescopic rod 15.
A kind of Model Pile tester of controllable soil temperature is used to simulate the soil body under long term ambient temperature variation,
Influence to pile foundation；
The meaning of above-mentioned test is: generally (more exact to be saturated clay in stratum for Wenzhou Area
Saying is: weak soil), after the completion of pile foundation construction, on the one hand, the soil body can generate consolidation settlement under temperature cycles load action,
(soil body can form downward frictional resistance in sedimentation to pile foundation) unfavorable to the bearing capacity of pile foundation；On the other hand, the soil body is consolidating
After sedimentation, mechanical index can be improved, i.e., have advantageous one side again to the bearing capacity of pile foundation；But above-mentioned two aspect is comprehensive
Altogether, which kind of rule, either field test, simulation laboratory test or numerical simulation is presented, is showed no detailed grind
Study carefully.
In view of the above-mentioned problems, can be studied using tester of the invention:
Itself the following steps are included:
First, the soil body is embedded: the placement in layers soil body (the specific soil body is determined according to the engineering geological condition of simulation),
Temperature sensor is buried according to preset height in the soil body, to measure temperature Stress Field Distribution in the soil body；
It is additionally provided with settlement sensor on soil body top, to measure the sedimentation situation on native surface；
Second, after the completion of the soil body fills, top cover 7 is mounted on inner ring side plate 3, on outer ring side plate 2；
Third is opened the unlatching of top cover temperature control tube assembly 9, side plate temperature control tube assembly 4, by control system so that the soil body
Temperature field is preset initial temperature field；
4th, piling: using the process of static press piling, mobile platform 16 is adjusted, so that the tip perpendicular alignmnet of stake model
Stake position center, restarts power telescopic rod 15, stake model is depressed into predetermined depth；
5th, after the completion of piling, control system sends instruction, adjusts top cover temperature control tube assembly 9, side plate temperature control tube assembly 4,
So that the temperature paths of the soil body are run according to preset operating condition, static load test is finally carried out.
Further, after piling, the drain valve 6 during testing is always on；After the completion of piling, pass through sash weight control
Pile body verticality processed；After piling, pile-soil model is stood one to testing again after two weeks.
Further, further include following test equipment in test:
Foil gauge is posted on the surface of stake 13, to measure strain of the pile foundation at different depth, and then obtains pile foundation not
With the stress intensity under depth；
In the embedded soil body, miniature earth pressure gauge is buried on the surface of stake 13, to measure Pile Soil normal stress；
Miniature earth pressure gauge is also buried in the bottom of stake 13, to measure stake end stress；
A pressure sensor is laid, between pile cover and power telescopic rod 15 to measure pile top load；
It is additionally provided with displacement sensor on the top of stake model, to measure the displacement at the top of stake model.
The displacement sensor of the top setting of stake model and the settlement sensor of soil body top setting, can be used machine
Electric dial gauge (" heat exchange pile bearing capacity characteristic model experimental study in saturation clay ", Chinese Journal of Rock Mechanics and Engineering).
In step 1, in order to simulate saturation clay, needs after the completion of the soil body is filled, soil model immersion is stood one
Week；Simultaneously using top cover temperature control tube assembly 9 (it is made of the inflatable membrane material shunk), adjusted to adjust soil body top strain
Plate 12 to the pressure of the soil body (pressure sensor is arranged in the lower surface of soil body top strain adjustable plate 12), with this simulate the soil body by
The situation of evenly load.
In step 5, the temperature field of the soil body is achieved difference by top cover temperature control tube assembly 9, side plate temperature control tube assembly 4
Soil temperature, by adjusting the side plate temperature control component of the different layers of side plate temperature control tube assembly 4, to adjust different soil in not equality of temperature
Spend the variation in path.
Specifically, short form test, the temperature field of the soil body keeps unified, the soil body when simulating Seasonal Cycle bring influences
Initial temperature field be set to 26 ° (simulations summers), open the whole of top cover temperature control tube assembly 9 and side plate temperature control tube assembly 4
Then the solution in region makes the temperature of the soil body undergo 26 ° -5 ° -26 ° -5 ° ... and waits multiple circulations (2 weeks each circulation used times),
And then it can study under different circulations, the changing rule that Pile Soil interfacial pressure, stake top, native table settle.
The shortcomings that the studies above, is: not accounting for not identical (and the property of soil body of various soil mass temperature change itself
There is strong relationship in matter and temperature change path), therefore, the studies above still has much room for improvement.
In document: in " Ningbo Light rail different depth soil temperature changing rule observational study, Chinese prospective design ",
The soil body under different depth is reported with the temperature of seasonal variations: Ningbo area is in the soil temperature region below 10m
Stablize, the soil temperature of 5m or more is most sensitive.
The operation of top cover temperature control tube assembly 9 can make the soil body obtain change of gradient；Pass through side plate temperature control tube assembly 4
The temperature change of the further fine adjusting soil body is capable of in the adjusting of each layer side plate temperature control tube.
Embodiment two, in embodiment one: each layer side plate temperature control tube 4-1 is distributed along high uniformity.However, according in text
It offers: the research in " Ningbo Light rail different depth soil temperature changing rule observational study, Chinese prospective design ", top soil
The temperature of body becomes sensitive, and the variation of the lower part soil body is then basicly stable；To adapt to said circumstances, as shown in figure 5, embodiment two
In side plate temperature control tube 4-1 distribution using the design that top is close and caliber is thin, lower part is dredged and caliber is thick.
Using the design of embodiment two, foundation in initial temperature field realizes different soil under different temperatures path
Purpose is easier to realize.
The space that heat-insulating shield, outer ring side plate 2, the space formed between inner ring side plate 3 are side plate temperature control tube 4-1.
Embodiment three, the design of embodiment one, two are the temperature that the periphery soil body is influenced by inner ring side plate 3；Inner ring
Side plate 3 uses a kind of homogeneous material plate, can have trend temperature self-balanced in plate (second law of thermodynamics), actually answer
Used time is simultaneously bad.
As shown in fig. 6, the inner ring side plate 3 of embodiment three design it is as follows: in the corresponding heat-insulating shield 4-2 range of inner ring side plate
Material identical with heat-insulating shield 4-2 is inside also used, other parts use thermally conductive/cold material.
Further, inner ring side plate 3, outer ring side plate 2, heat-insulating shield link into an integrated entity；
Using the design of embodiment three, the non-uniform temperature distribution of inner ring side plate can be realized, and then be easily achieved the soil body
The different variations in temperature field.
Example IV, as shown in fig. 7, being embedded with the bottom temperature control of several concentric circles in permeable structure layer 5 or bottom plate
The bottom temperature control tube assembly 17 that pipe is constituted.
It is also provided with temperature control tube assembly by the bottom plate in tester, its object is to reinforce the control energy to soil temperature field
Power.
Embodiment five, for analog energy stake, factor includes three kinds: consolidation of the soil body under temperature change path is heavy
The influence that drop, temperature change path difference, the temperature change of pile foundation itself of the different depth soil body are brought；
The temperature change of energy stake can use the prior art, be internally provided with a model temperature control tube in stake model 13
Component 18；Stake model temperature control tube assembly 18 is connected to circulation fluid system 11.
In test comprising following steps:
First, the soil body is embedded: the placement in layers soil body (the specific soil body is determined according to the engineering geological condition of simulation),
Temperature sensor is buried according to preset height in the soil body, to measure temperature Stress Field Distribution in the soil body；
It is additionally provided with settlement sensor on soil body top, to measure the sedimentation situation on native surface；
Second, after the completion of the soil body fills, top cover 7 is mounted on inner ring side plate 3, on outer ring side plate 2；
Third is opened the unlatching of top cover temperature control tube assembly 9, side plate temperature control tube assembly 4, by control system so that the soil body
Temperature field is preset initial temperature field；
4th, piling: using the process of static press piling, mobile platform 16 is adjusted, so that the tip perpendicular alignmnet of stake model
Stake position center, restarts power telescopic rod 15, stake model is depressed into predetermined depth；After piling, drain valve 6 is opened；
5th, after the completion of piling, control system send instruction, adjustment top cover temperature control tube assembly 9, side plate temperature control tube assembly 4,
Bottom temperature control tube assembly 17, the temperature of every temperature control tube in stake model temperature control tube assembly 18, so that the soil body and stake model
Temperature paths are run according to preset operating condition, finally carry out static load test.
It should be noted that in order to realize the accurate control to soil temperature field and stake model temperature, top cover temperature control tube
Component 9, top cover temperature control tube assembly 9, bottom temperature control tube assembly 17, every temperature control tube in stake model temperature control tube assembly 18, with
Circulation fluid system 11 is connected to, and the inside of circulation fluid system 11 is corresponding to have independent circulation fluid cellular system with every temperature control tube,
To realize that the temperature of every temperature control tube independently changes.
Circulation fluid uses the prior art, such as uses the aqua type anti-icing fluid of ethylene glycol.
In addition, it is necessary to explanation, as shown in figure 9, the Model Pile for a kind of controllable soil temperature of the invention is tested
The schematic diagram of the control system of instrument；
Shown control system includes: data collection module, data disaply moudle, control module；
The aforementioned various kinds of sensors, such as temperature sensor, native table settlement sensor, pile head settlement sensor, strain
Piece, earth pressure gauge, pore pressure gauge etc., connect with data collection module；
Data collection module sends a signal to data disaply moudle, checks for testing crew；
Control module is connect with circulation fluid system, power telescopic rod, i.e., by control module come control loop liquid system, dynamic
The start and stop of power telescopic rod.
, the preferred embodiment of present aspect has already been described in detail above, it is understood that having read of the invention above-mentioned say
After awarding content, those skilled in the art can make various modifications or changes to the present invention.Such equivalent forms equally fall into this Shen
It please be in the protection scope of the appended claims.
Claims (10)
1. a kind of Model Pile tester of controllable soil temperature characterized by comprising bottom plate, outer ring side plate, inner ring side
Plate, side plate temperature control tube assembly, top cover, stake model；
Outer ring side plate, inner ring side plate are mounted in bottom plate, and top cover is connect with outer ring side plate；
The soil body is filled between inner ring side plate, and stake model is placed in the soil body；
Bottom outer ring side plate, inner ring side plate level cross-sectionn be circle, and the two center of circle is same point；The side plate, interior in outer ring
It encloses and side plate temperature control tube assembly is set in annular space between side plate, the side plate temperature control tube assembly includes: parallel from top to bottom
The multiple cricoid side plate temperature control tubes being arranged；
Heat-insulating shield is additionally provided between each layer side plate temperature control tube in annular space；The outside of each side plate temperature control tube connects
It is connected to independent inlet tube and outlet tube, the inlet tube and outlet tube are connect with circulation fluid system, pass through circulation fluid system
It unites to adjust the temperature of the circulation fluid in each layer side plate temperature control tube.
2. a kind of Model Pile tester of controllable soil temperature as described in claim 1, which is characterized in that outer ring side plate to
Outer stretching first level loop connecting plate, the top area between outer ring side plate and inner ring side plate are also fixedly connected with the second water
Flat ring shape connecting plate；
The first level loop connecting plate, the second horizontal endless connecting plate are provided with threaded hole；It is provided on top cover
The threaded hole mutually coped with the threaded hole of the first level loop connecting plate, the second horizontal endless connecting plate；
Top cover and first level loop connecting plate, the second horizontal endless connecting plate, pass through corresponding bolt hole and spiral shell
Bolt nut assembly is fixed together；
The top cover temperature control tube assembly and soil body top strain adjustable plate are fixedly connected in the lower end of top cover；The top cover temperature
Keyholed back plate component links together with top cover, soil body top strain adjustable plate；The lower surface of soil body top strain adjustable plate is provided with
Top-film；
The top cover temperature control tube assembly use may expand non-permeable film and be made；In the top cover temperature control tube of top cover temperature control tube assembly
Circulating liquid is passed through to realize that temperature, top cover temperature control tube assembly are that the top cover temperature control tube of multiple concentric circles is constituted.
3. a kind of Model Pile tester of controllable soil temperature as claimed in claim 1 or 2, which is characterized in that soil body top
Portion's stress adjustable plate is provided centrally with hole, and in order to which neck ring passes through, neck ring is pressed in top-film, outside and soil body top
The interior side contacts of the centre bore of portion's stress adjustable plate；
Round thread hole is also offered on top cover, pile pipe guidance pipe collar in hole is installed in above-mentioned round thread hole, and pile pipe is drawn
Conduit hoop is adapted to the stake diameter of stake model, and stake model sequentially passes through pile pipe guidance pipe collar and neck ring, subsequently into the soil body
In.
4. a kind of Model Pile tester of controllable soil temperature as claimed in claim 3, which is characterized in that pile pipe guiding tube
Hoop is internally provided with sliding pearl, and sliding pearl contacts with stake model.
5. a kind of Model Pile tester of controllable soil temperature as claimed in claim 3, which is characterized in that further include: thoroughly
Water-bound layer, drain valve, permeable structure layer bottom plate top and be set between inner ring side plate, set in bottom plate
Drainpipe is set, the region that drainpipe stretches out bottom plate is provided with drain valve；The top of permeable structure layer is provided with bottom film,
The inner surface of inner ring side plate is provided with side film.
6. a kind of Model Pile tester of controllable soil temperature as claimed in claim 5, which is characterized in that soil body setting exists
Between bottom film, side film, top-film is additionally provided on the top of the soil body；Bottom film, side film, top-film are all made of latex
Film.
7. a kind of Model Pile tester of controllable soil temperature as claimed in claim 6, which is characterized in that stake model top
It is connect with loading system, loading system includes: gantry crane, power telescopic rod；It is provided in the crossbeam lower part of gantry crane mobile flat
Dynamic telescopic rod is fixedly installed in the lower part of platform, mobile platform, and the lower end of power telescopic rod is provided with mounting hole, the stake model
Top be provided with pile cover installation part, pile cover installation part is threadingly attached in the mounting hole of the lower end of power telescopic rod.
8. a kind of Model Pile tester of controllable soil temperature as claimed in claim 7, which is characterized in that in stake model
It is internally provided with a model temperature control tube assembly；Stake model temperature control tube assembly and circulation fluid system connectivity.
9. using a kind of working method of the Model Pile tester of controllable soil temperature as claimed in claim 7, feature exists
In, comprising the following steps:
First, the soil body is embedded: the placement in layers soil body buries temperature sensor according to preset height in the soil body, to measure soil
Temperature Stress Field Distribution in body；It is additionally provided with settlement sensor on soil body top, to measure the sedimentation situation on native surface；
Second, after the completion of the soil body fills, top cover is mounted on inner ring side plate, on the side plate of outer ring；
Third is opened top cover temperature control tube assembly, the unlatching of side plate temperature control tube assembly, by control system so that soil temperature field
For preset initial temperature field；
4th, piling: using the process of static press piling, mobile platform is adjusted, so that in the tip perpendicular alignmnet stake position of stake model
The heart restarts power telescopic rod, and stake model is depressed into predetermined depth；
5th, after the completion of piling, control system sends instruction, top cover temperature control tube assembly, side plate temperature control tube assembly is adjusted, so that native
The temperature paths of body are run according to preset operating condition, finally carry out static load test.
10. using a kind of working method of the Model Pile tester of controllable soil temperature as claimed in claim 8 comprising with
Lower step:
First, the soil body is embedded: the placement in layers soil body buries temperature sensor according to preset height in the soil body, to measure soil
Temperature Stress Field Distribution in body；
It is additionally provided with settlement sensor on soil body top, to measure the sedimentation situation on native surface；
Second, after the completion of the soil body fills, top cover is mounted on inner ring side plate, on the side plate of outer ring；
Third is opened top cover temperature control tube assembly, the unlatching of side plate temperature control tube assembly, by control system so that soil temperature field
For preset initial temperature field；
4th, piling: using the process of static press piling, mobile platform is adjusted, so that in the tip perpendicular alignmnet stake position of stake model
The heart restarts power telescopic rod, and stake model is depressed into predetermined depth；After piling, drain valve is opened；
5th, after the completion of piling, control system sends instruction, adjusts top cover temperature control tube assembly, side plate temperature control tube assembly, bottom temperature
The temperature of keyholed back plate component, every temperature control tube in stake model temperature control tube assembly, so that the temperature paths of the soil body and stake model are pressed
It is run according to preset operating condition, finally carries out static load test.
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| CN201910222516.3A CN109883837B (en) | 2019-03-22 | 2019-03-22 | Model pile tester capable of controlling soil body temperature and testing method thereof |
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| CN201910222516.3A CN109883837B (en) | 2019-03-22 | 2019-03-22 | Model pile tester capable of controlling soil body temperature and testing method thereof |
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| CN112834564A (en) * | 2021-03-02 | 2021-05-25 | 中国海洋大学 | Testing device and method for adjusting soil body temperature |
| CN113377137A (en) * | 2021-05-14 | 2021-09-10 | 中国科学院长春光学精密机械与物理研究所 | Temperature control device of optical element |
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| CN109883837B (en) | 2021-07-23 |
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