CN206531737U - A kind of energy pile stake Soil Interface mechanical behavior attribute testing equipment - Google Patents
A kind of energy pile stake Soil Interface mechanical behavior attribute testing equipment Download PDFInfo
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- CN206531737U CN206531737U CN201720205290.2U CN201720205290U CN206531737U CN 206531737 U CN206531737 U CN 206531737U CN 201720205290 U CN201720205290 U CN 201720205290U CN 206531737 U CN206531737 U CN 206531737U
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The utility model discloses a kind of energy pile stake Soil Interface mechanical behavior attribute testing equipment, including framework, vertical pressure loading system, stake Soil Interface simulation system, loop temperature-control system, water filling drainage system and data collecting system.Testing equipment of the present utility model and method pass through the temperature of loop temperature-control system regulation concrete hollow cylinder, the heat exchanging process of true simulation energy pile.Using water filling drainage system, control soil sample degree of saturation, the change procedure for simulating saturation soil sample soil around pile and stake Soil Interface normal stress pore water pressure under condition of different temperatures.Related sensor, collecting pile Soil Interface normal pressure and temperature data are arranged in concrete hollow cylindrical outer wall.By transmission rod axial force sensor and displacement transducer, the frictional force of collecting pile Soil Interface and relative shear deformation.By the collection and analysis of data, the research for the mechanical behavior feature and its evolutionary process of stake Soil Interface under hot and cold ringing provides test data.
Description
Technical field
The utility model belongs to Geotechnical Engineering experimental technique field, specifically a kind of energy pile Pile Soil interface mechanicses behavior
Attribute testing equipment.
Background technology
The stake of energy pile, also referred to as energy, is opened underground pile foundation as a kind of novel energy of shallow layer ground-temperature energy heat exchanger
Hair utilizes technology.In recent years, increasingly serious with energy crisis and problem of environmental pollution, shallow layer ground-temperature energy is green as one kind
Color, sustainable new energy have obtained extensive concern and development.The technology utilizes the thermal capacity of the earth, in summer by indoor heat
Amount, which is stored in underground, is used for the heating in winter, while also having reached the purpose of Summer Indoor refrigeration.Due to traditional earth source heat pump skill
Art needs to drill outside building yard, not only occupies extra place, and construction cost is higher, causes project initial investment
Greatly.Eighties 21 century, engineers are attempted to be placed in heat exchanger tube into pile foundation, sole plate and diaphram wall of building etc.
It is used for replacing traditional ground heat exchanger in structure, not only saves place and greatly reduce earth-source hot-pump system
Cost.Energy pile is that heat exchanger tube is placed in pile foundation, and it is realized by the circulation of fluid in pipe extracts and store heat into the earth
Amount.While saving the underground space, ensureing construction quality, pile body concrete heat exchange efficiency is high, with more preferable economic effect
Should.
Energy pile has the double action for undertaking upper load and carrying out heat exchange.The bearing capacity part of energy pile is complete
Portion comes from the side friction of stake and surrounding soil.In the hot and cold cyclic process of energy pile, the heat expansion of pile body and surrounding soil is cold
Contracting can influence the rigidity at Pile Soil interface and the lateral stress of soil around pile, so as to influence the bearing capacity of friction pile.At present, on becoming
The research of Pile Soil interface normal stress is less under the conditions of temperature, because the changing rule understanding to normal stress is unclear, to Pile Soil
The accurate judgement of interface maximum static friction force causes difficulty.In addition, under temperature match curing conditions, the shear property at Pile Soil interface is also
The hot issue studied at present.Based on this, the utility model proposes Pile Soil interface normal direction stress test under a kind of temperature match curing conditions and
Shearing test equipment, by laboratory test, is studied during temperature cycles, Pile Soil interface normal stress, the change of shear property
Law.The utility model discloses energy pile for grasping energy pile Pile Soil interface mechanical characteristic variation with temperature rule
The feature of loading capability, promotes the promotion and application of energy pile technology, with important theoretical research and engineering application value.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of energy pile Pile Soil interface mechanicses behavioral trait experiment and set
Standby, the testing equipment constraints different with method consideration simulates Pile Soil interface normal stress under different temperatures, side friction
The change of the parameters such as power, normal direction and tangential deformation, to study the change machine of Pile Soil interface mechanicses characteristic under hot and cold ringing
Reason is provided fundamental basis.
To realize above-mentioned utility model purpose, the utility model is adopted the following technical scheme that：
A kind of energy pile Pile Soil interface mechanicses behavioral trait testing equipment, including it is framework, Pile Soil interface simulation system, perpendicular
To pressure-loaded system, loop temperature-control system, data collecting system.
The framework is used to support the other systems of testing equipment.
The Pile Soil interface simulation system include base, annular soil sample, concrete hollow cylinder, pressing plate, hollow ring and
Servo step motor.The position on the base top is used to place concrete hollow cylinder and annular soil sample..Prefabricated concrete
Hollow cylinder is installed in hollow ring.Load the experiment soil body between concrete hollow cylinder and hollow ring, form annular
Soil sample.Utilize concrete hollow cylinder and the contact surface simulation Pile Soil interface of annular soil sample.The servo step motor is arranged on
On base, for promoting concrete hollow cylinder, it would however also be possible to employ other manner is promoted, servo step motor is not that this practicality is new
The testing equipment of type is necessary.When servo step motor promotes concrete hollow cylinder, annular soil sample is remained stationary as, and makes coagulation
The relative shear changing of the relative positions, the deformation at simulation Pile Soil interface occur for native hollow cylinder and the contact surface of annular soil sample.Concrete hollow is justified
Column outer wall is provided with groove, for placing earth pressure gauge and the first temperature sensor, the normal stress and temperature at measurement Pile Soil interface
Degree, hollow parts are used to draw sensor signal lines.The pre-buried heat exchanger tube in concrete hollow cylinder, using circulation fluid to coagulation
Native hollow cylinder heating cools.Pressing plate is stamped on soil sample top, and soil sample is vertically loaded by pressing plate, simulates pile peripheral earth
Natural crustal stress states.Hollow ring is installed among the base upper space of framework, and hollow ring bottom plate bottom is provided with biography
Press chamber.In addition, pressure transmission chamber is engaged with base can play a part of fixation hollow annulus.Concrete hollow cylinder can truly simulate stake
Interaction between soil, and beneficial to shearing test is carried out, be easy to place sensor, it is to avoid disturbance of the sensor to soil sample.
The vertical pressure loading system is used to apply vertical load to annular soil sample.
The loop temperature-control system is used for the temperature changing process of simulation piles, includes temperature-rise period and the winter of summer pile body
Season pile body temperature-fall period.The data collecting system includes earth pressure gauge and the first temperature sensor, earth pressure gauge and first
Temperature sensor is arranged in the groove of concrete hollow cylindrical outer wall, the normal stress and temperature data of collecting pile-Soil Interface.
The hollow ring is indium steel loop, and indium steel has very low thermal coefficient of expansion at normal temperatures, and thermal conductivity factor is low, can be very
Meet test requirements document well.
Further, the data collecting system also includes distributed fiberoptic sensor, in concrete hollow cylindrical outer wall
Ring pastes distributive fiber optic strain sensor, the radial deformation for measuring pile body under temperature match curing conditions.
Further, data collecting system also includes load transducer and displacement transducer, the load transducer and position
Displacement sensor is arranged between vertical pressure loading system and concrete hollow cylinder, for obtaining the work of servo stepping motor
The frictional force of the displacements of Shi Houbi concrete hollow cylinders, speed and Pile Soil interface.
Further, the energy pile Pile Soil interface mechanicses behavioral trait testing equipment also includes water filling drainage system.Institute
Stating water filling drainage system includes limbers, water injection valve, air bleeding valve.The limbers is opened in base bottom, and the pressing plate leads to
Cross elastic tape to be in close contact with concrete and hollow ring, hollow ring is in close contact with bottom pressure transmission chamber by elastic tape, bottom
Seat is in close contact with concrete hollow cylinder by elastic tape, is prevented ring-type soil sample from seepage occurring in process of the test, is reached close
The purpose of envelope.The water injection valve is arranged on outside limbers, can control soil sample saturation shape by limbers, water filling draining
State.Pore pressure gauge is installed outside the limbers, in real time the change of measurement process of the test Pore Pressure.The pressure
Steam vent is offered on plate, drain tap is connected on pressing plate with pressing plate steam vent.In temperature elevation process, concrete is empty
Heart cylinder can outside expansion extrusion soil；During temperature reduction, heavy wall concrete hollow cylinder can be caused to contract again
Stress state between stake soil changes, mutual between the stake soil that true simulation energy pile is caused due to hot and cold circulation
Effect.
Further, the loop temperature-control system includes low temperature thermostat bath, water circulating pump, heat exchanger tube, choke valve, flow velocity
Meter；Data collecting system also includes second temperature sensor, the temperature for monitoring circulation fluid.The low temperature thermostat bath includes adding
Warm device and cooler, with temp regulating function.Heat-insulating material is used around thermostat（Such as polystyrene foam plastics）Parcel,
Heat is prevented to scatter and disappear.Thermostat interior circulation liquid is pumped into simulation piles by water circulating pump via aqueduct（Concrete hollow cylinder）In
Heat exchanger tube, for circulation fluid flowing power is provided.Choke valve is set on the aqueduct, for adjusting liquid in heat exchanger tube
Flow velocity, it is in turbulent condition to make liquid in pipe.Second temperature sensor is arranged at the heat exchanger tube inlet and outlet, for measuring
Heat exchanger tube imports and exports the temperature of circulation fluid.Another arrangement current meter, the flow velocity for measuring and controlling circulation fluid.By importing and exporting temperature
Heating and the temperature-fall period of degree and circulation fluid flow control simulation piles.The aqua type anti-icing fluid conduct of ethylene glycol is used in experiment
Circulation fluid, the aqua type anti-icing fluid of ethylene glycol has boiling point height, small volatility, modest viscosity and varied with temperature small, thermally-stabilised
Property it is good the advantages of, operating temperature at -45 ~ 155 DEG C, Pass Test requirement.
Further, the vertical pressure loading system uses lever load system, and lever load system includes lever, weight
Code, threaded rod, transmission rod.The vertical pressure loading system is equipped with several levers, is radially distributed, there is screw thread centre
Bar, threaded rod surrounding is equipped with steel shaft, and lever one end is connected on threaded rod by steel shaft, and the other end applies counterweight, passes through lever
Principle applies vertical load to ring-type soil sample.Described threaded rod one end is threaded, and is connected to by nut on lever, threaded rod
It can move up and down.Transmission rod lower end is concave shaped, is contacted with pressing plate bearing point, transmits vertical load.
Further, data collecting system also includes transmission rod axial force sensor, and ring-type soil is vertically applied to for measuring
Pressure on sample.
The utility model proposes a kind of energy pile Pile Soil interface mechanicses behavioral trait testing equipment, advantage be use
Lever load system, vertical pressure is applied to soil sample, and the static lateral pressure principle according to soil presses to Pile Soil interface, with pile body
Actual loading condition be identical.The counterweight of corresponding weight is placed in lever one end, vertical pressure, stability is accurately controlled
It is good, and compressed due to soil sample by transmission rod and connecting device filtering, deviation of lever and the lateral load caused.Utilize circulation fluid
Pass through the temperature of loop temperature-control system regulation heavy wall concrete hollow cylinder, the true heating simulated in energy pile heat exchanging process
And temperature-fall period.Using water filling drainage system, saturation, draining are carried out to annular soil sample, simulation saturation soil sample is in different temperatures bar
The change procedure of soil around pile and Pile Soil interface normal stress pore water pressure under part.In heavy wall concrete hollow cylindrical outer wall cloth
Put related sensor, collecting pile-Soil Interface normal pressure and temperature data.Pass through transmission rod axial force sensor and displacement sensing
Device, the frictional force of collecting pile-Soil Interface and relative shear deformation.By the collection and analysis of data, under being hot and cold ringing
The research of the mechanical behavior feature and its evolutionary process at Pile Soil interface provides test data.Testing equipment pair of the present utility model
In grasping energy pile Pile Soil interface mechanical characteristic variation with temperature rule, the feature of energy pile bearing capacity is disclosed, energy is promoted
The promotion and application of source stake technology, with important theoretical research and engineering application value.
Brief description of the drawings
Fig. 1 is testing equipment structural representation of the present utility model；
Fig. 2 is heat exchanger tube layout drawing in concrete hollow cylinder；
Fig. 3 is fibre optical sensor, earth pressure gauge and temperature sensor scheme of installation；
Fig. 4 is Pile Soil interface Local map；
Fig. 5 is base profile；
Fig. 6 is base vertical view；
Fig. 7 is base graphics
Fig. 8 is indium steel loop front view；
Fig. 9 is indium steel loop bottom schematic view；
Figure 10 is indium steel loop schematical top view；
Figure 11 is vertical loading system top view.
Accompanying drawing number：1. framework；2. lever；3. counterweight；4. threaded rod；5. transmission rod；6. base；7. heavy wall concrete is empty
Heart cylinder；8. permeable stone；9. pressing plate；10. hollow ring；11. heat-insulating material；12. elastic tape；13. limbers；14. servo is walked
Enter motor；15 heat exchanger tube；16. earth pressure gauge；17. the first temperature sensor；18. low temperature thermostat bath；19. water pump；20. section
Flow valve；21. current meter；22. second temperature sensor；23. pressure sensor；24. pore pressure gauge；25. fibre optical sensor；
26. load transducer；27. displacement transducer；28. (FBG) demodulator；29. water injection valve；30. air bleeding valve.
Embodiment
Below in conjunction with the accompanying drawings, to the utility model proposes a kind of energy pile Pile Soil interface mechanicses behavioral trait experiment set
It is standby to be described in detail.In description of the present utility model, it is to be understood that term " left side ", " right side ", " top ", " under
The orientation or position relationship of the instruction such as portion ", " bottom " are, based on orientation shown in the drawings or position relationship, to be for only for ease of and retouch
State the utility model and simplify and describe, rather than indicate or imply signified device or element must have specific orientation, with
Specific azimuth configuration and operation, " first ", " second " etc. are not offered as the significance level of parts, therefore it is not intended that right
Limitation of the present utility model.The specific size used in the present embodiment technical scheme solely for the purpose of illustration, is not intended to limit this
The protection domain of utility model.
As shown in figure 1, a kind of energy pile Pile Soil interface mechanicses behavioral trait testing equipment, including framework, vertical pressure add
Loading system, Pile Soil interface simulation system, loop temperature-control system, data collecting system.
The preferred erection of steel work of framework 1, effect is to provide the strong point for the other systems of the present apparatus, and steel frame construction is by channel-section steel and steel
Plate seamless welding is formed, and bottom plate has made widening treatment, and reinforcement processing is made along girder and secondary beam length direction, and steel frame type framework is provided
The sufficient space of simulated test.Other materials that can support testing equipment also may be used.
Pile Soil interface simulation system include base 6, concrete hollow cylinder 7, permeable stone 8, pressing plate 9, hollow ring 10,
Heat-insulating material 11, elastic tape 12.Concrete hollow cylinder 7 uses heavy wall, and heavy wall concrete hollow cylinder 7 can truly simulate reality
Stake in engineering, hollow-core construction is mainly easy to draw the signal wire of sensor.As shown in Figs. 5 to 7, in the middle of the top half of base 6
For cylindrical space, for installing heavy wall concrete hollow cylinder 7, heavy wall concrete hollow cylinder 7 is arranged on centre position；Bottom
The lower right side of seat 6 is provided with part hollow and right openings under limbers 13, base, for placing servo stepping motor 14.
There is a connecting rod moving up and down centre, and servo stepping motor 14 promotes heavy wall coagulation by connecting rod with given pace
Native hollow cylinder 7, with the effect for making Pile Soil interface occur detrusion.
As shown in figure 3, heavy wall concrete hollow cylinder 7 is hollow-core construction, and outer wall is provided with some grooves, for installing soil
The temperature sensor 17 of pressure gauge 16 and first, the number of sensors that number of recesses can be laid as needed is determined.Groove internal diameter with
Sensor external diameter matches, and earth pressure gauge and temperature sensor is fixed in groove using epoxy resin, signal wire then passes through
Heavy wall concrete hollow cylinder hollow structure is exported, and is connected with outside (FBG) demodulator 28, computer is then attached to, for gathering
Pile Soil interface normal stress and temperature data.As shown in Fig. 2 in heavy wall concrete hollow cylinder pre-buried heat exchanger tube 15, it is and outer
Portion's heat exchanger tube is connected.
As shown in figure 4, prefabricated concrete hollow cylinder is installed in hollow ring, the two center of circle is overlapped, in concrete
Load the experiment soil body between hollow cylinder and hollow ring, compaction in layers forms annular soil sample.Using concrete hollow cylinder with
The contact surface simulation Pile Soil interface of annular soil sample.Bottom plate bottom is provided with pressure transmission chamber, is closely connected by elastic tape with base limbers
Connect, be hollow-core construction in the middle of bottom plate, hollow internal diameter matches with heavy wall concrete hollow cylinder external diameter, and is reached by elastic tape
One ring groove is arranged at sealing purpose, bottom plate top, air during water filling in energy fully saturation soil sample evacuation aperture gap.Hollow ring 10
Periphery parcel heat-insulating material 11, prevents heat to scatter and disappear, and bottom heat-insulating material 11 is provided with five circular holes, and bottom protrusion steel column passes through exhausted
Hot material 11 supports upper load, and both with heat insulating function, upper load can be supported again.
As shown in Fig. 8,9 and 10, hollow ring 10 uses indium steel loop, and indium steel loop thermal coefficient of expansion is low, under temperature match curing conditions
Deformation is not produced, the dilatancy of soil sample can be constrained, and thermal conductivity factor is low, with certain heat insulating function.
Heavy wall concrete hollow cylinder 7 can truly simulate stake in Practical Project, and its hollow-core construction is easy to draw sensor
Signal wire.To prevent water body seepage in water filling drainage procedure, elastic tape 12 is installed in relevant position, sealed purpose is reached.
In temperature elevation process, heavy wall concrete hollow cylinder 7 outwards expansion can compress the soil body, and during temperature reduction, heavy wall is mixed
Solidifying soil hollow cylinder can cause the stress state between stake soil to change to contract again, and true simulation energy pile is due to cold
Thermal cycle and cause stake soil between interaction.
Loop temperature-control system includes heat exchanger tube 15, low temperature thermostat bath 18, water circulating pump 19, choke valve 20, current meter 21, the
Two temperature sensors 22, for simulating summer, winter the ground cooling of pile body and temperature-rise period in heat exchange.Low temperature thermostat bath 18 is wrapped
Warmer and cooler are included, circulation fluid uses the aqua type anti-icing fluid of ethylene glycol, high with boiling point, and volatility is small, modest viscosity
And vary with temperature small, the features such as heat endurance is good.Heat-insulating material polystyrene foam can be used around low temperature thermostat bath 18
Plastic wraps, prevent heat to scatter and disappear.Circulation fluid is pumped into simulation piles by water circulating pump 19, is circulation fluid in aqueduct 15 and is changed
Offer power is provided in heat pipe.On aqueduct 15, choke valve 20 is set to be used to adjust water guide at pump outlet
The flow velocity of circulation fluid in pipe, it is turbulent condition to make in-pipe flow, and choke valve 20 can also be arranged on other positions on aqueduct 15.
Second temperature sensor 22 is arranged at water guide water inlet tube and water outlet.Another arrangement current meter 21, adjusts according to current meter 21 and throttles
Valve 20 reaches the purpose of coutroi velocity, and the heating of simulation piles is controlled by out temperature and circulation fluid flow velocity and was cooled
Journey.
Data collecting system includes the axle power on the miniature earth pressure gauge 16 in Pile Soil interface, temperature sensor 17, transmission rod 4
Sensor 23, base pore pressure gauge 24, distributed fiberoptic sensor 25, load transducer 26 and displacement transducer 27.
The outer wall surrounding of heavy wall concrete hollow cylinder 7 arranges earth pressure gauge 16 and temperature sensor 17, and the normal direction of collecting pile-Soil Interface should
Power and temperature data, by the axial force sensor 23 on transmission rod 4, measure the load vertically applied.Base pore pressure gauge
24 collection saturation soil sample pore water pressure data.Distributive fiber optic strain is pasted in the outer wall ring of heavy wall concrete hollow cylinder 7
Sensor 25, is connected with outside (FBG) demodulator 28, monitors the radial deformation of heavy wall concrete hollow cylinder.In heavy wall concrete hollow
Load transducer 26 and displacement are installed between cylinder 7 and connecting device 5 and between servo stepping motor 14 and top connecting rod
Sensor 27, frictional force and shear displacemant for monitoring Pile Soil interface in shear history.
Water filling drainage system includes limbers 13, water injection valve 29, air bleeding valve 30；Limbers 13 is by base 6, with indium
The bottom pressure transmission chamber of steel loop 10 connects, and water injection valve 29 is arranged on outside limbers 13.Limbers 13, water injection valve can be passed through
29th, air bleeding valve 30 carries out saturation to soil sample, and the change that pore pressure gauge 24 monitors pore water pressure is installed outside limbers 13
Change.
Vertical pressure loading system can be by the way of vertical force be loaded directly into, it would however also be possible to employ Indirect Loaded vertical force
Mode.In order to reach in preferable effect, the present embodiment, using lever load system, including lever 2, counterweight 3, threaded rod
4th, there are four lever loading devices transmission rod 5, are radially distributed as shown in figure 11, in loading system, and the one end of lever 2 passes through
Steel shaft is connected on framework, and the other end applies counterweight 3, and vertical load is applied by lever principle, and the one end of threaded rod 4 carries spiral shell
Line, is connected on framework by nut, can be moved up and down.It is connected on transmission rod 5 by steel shaft with lever 2, lower end connects with steel plate
Touch, transmit vertical load.When annular soil sample sectional area is larger, radiant type loading system can provide higher vertical load,
It is simple to operate and loading is uniform.
Specific test method：
Test soil sample selection sand, it is assumed that 20 DEG C of indoor temperature.
Preparation：Mounting seat 6, the bolt of firm banking 6 checks water valve 29 and limbers 13, runs servomotor
14, check whether can normal operation, after displacement sensing 27 and load transducer 22 are installed in relevant position.Place soil sample before
Heat-insulating material 11 is placed in surrounding and bottom, arranged in heavy wall concrete hollow cylinder earth pressure gauge 16, temperature sensor 17 and
Distributed fiberoptic sensor 25, is put into indium steel loop 10 and permeable stone 8 and justifies the heavy wall concrete hollow for installing sensor afterwards
Post is arranged on base, inserts soil sample in surrounding layering and is compacted, soil sample is put into permeable stone 8 and pressing plate 9 and on pressing plate after filling in
Place insulating materials 11 in portion.Displacement transducer 27 and load sensing are installed between threaded rod 4 and heavy wall concrete hollow cylinder
Device 26, transmission rod 5 is installed on a predetermined position, adjusts threaded rod 4 and pressure sensor 23 is put into its underpart.
Pore pressure gauge 24 and water valve 29 are installed in the outside of base 6, temperature-controlling system is checked.
Test procedure：
First with lever load system, vertical load is applied to ring-type soil sample by placing counterweight, static side pressure is utilized
Power principle makes the normal stress at Pile Soil interface reach certain value.The normal stress setting value needs specific setting according to experiment, such as
50kPa, 100kPa, 200kPa etc..
Afterwards according to the experimental condition of design, enable water filling drainage system and saturation and draining are carried out to annular soil sample.Saturation：
Determine after the opening of drain tap 24 by limbers 13 to the slow water filling of annular soil sample, exclude the air in soil sample space and make soil
Sample saturation, closes drain tap 24 and water injection valve 23 afterwards（Soil sample can also be made to reach that saturation state is gone forward side by side before loading
Row loading）；Draining：Water injection valve 23 is always in process of the test；
The circulation fluid in low temperature thermostat bath 18 is pumped into heavy wall concrete hollow cylinder using water circulating pump 19, by following
The temperature of ring temperature-controlling system regulation and control heavy wall concrete hollow cylinder 7, records the numerical value of current meter 21, according to gateway lower water temperature section
Flow the coutroi velocity of valve 20.
According to experimental design, when pile body and pile peripheral earth temperature reach test requirements document, start servomotor 14, promote mixed
Solidifying soil hollow cylinder is moved by design speed, and such as 0.02mm/min makes Pile Soil interface produce relative shear, simulates actual Pile Soil
Mechanical behavior of the interface under temperature match curing conditions, obtains the frictional force of a Soil Interface.In addition to speed, concrete can also be controlled
The other side of the motion mode of hollow cylinder, such as come and go shearing or disposable linear shear, such as spiral shearing etc.
Deng.
Under during experiment is whole using data collecting system collection different temperatures Pile Soil interface normal stress, temperature,
Pore water pressure, the displacement of heavy wall concrete hollow cylinder, radial deformation, with the related data such as the frictional force of annular soil sample.
Based on the description to the utility model preferred embodiment, it should be apparent that be defined by the appended claims
The utility model be not limited only to the specific detail illustrated in specification above, without departing from the utility model objective or
Scope to many obviously change of the present utility model equally possible reaches the purpose of this utility model.
Claims (8)
1. a kind of energy pile Pile Soil interface mechanicses behavioral trait testing equipment, it is characterised in that add including framework, vertical pressure
Loading system, Pile Soil interface simulation system, loop temperature-control system, data collecting system；
The framework is used to support the other systems of testing equipment；
The Pile Soil interface simulation system includes base, annular soil sample, concrete hollow cylinder, pressing plate and hollow ring；It is described
The position on base top is used to place concrete hollow cylinder and annular soil sample；Prefabricated concrete hollow cylinder is installed on hollow
In annulus；Load the experiment soil body between concrete hollow cylinder and hollow ring, form annular soil sample；The concrete hollow
Cylindrical outer wall is provided with groove, for placing earth pressure gauge and the first temperature sensor；It is stamped pressing plate in the annular soil sample top；Institute
State hollow ring to be installed among base upper space, hollow ring bottom plate bottom is provided with pressure transmission chamber；
The vertical pressure loading system is used to apply vertical load to annular soil sample；
The loop temperature-control system is used for the temperature changing process of simulation piles；
The data collecting system includes earth pressure gauge and the first temperature sensor, earth pressure gauge and the first temperature sensor arrangement
In the groove of concrete hollow cylindrical outer wall.
2. energy pile Pile Soil interface mechanicses behavioral trait testing equipment according to claim 1, it is characterised in that described
Hollow ring is indium steel loop.
3. energy pile Pile Soil interface mechanicses behavioral trait testing equipment according to claim 1, it is characterised in that described
Data collecting system also includes distributed fiberoptic sensor, and distributive fiber optic strain is pasted in concrete hollow cylindrical outer wall ring
Sensor.
4. energy pile Pile Soil interface mechanicses behavioral trait testing equipment according to claim 1, it is characterised in that described
Data collecting system also includes load transducer and displacement transducer, and the load transducer and displacement transducer are arranged on vertical
Between pressure-loaded system and concrete hollow cylinder.
5. energy pile Pile Soil interface mechanicses behavioral trait testing equipment according to claim 1, it is characterised in that also wrap
Include water filling drainage system；The water filling drainage system includes limbers, water injection valve, air bleeding valve；The limbers is opened in bottom
Seat bottom, the pressing plate is in close contact by elastic tape and concrete and hollow ring, and hollow ring passes through with bottom pressure transmission chamber
Elastic tape is in close contact, and base is in close contact with concrete hollow cylinder by elastic tape；The water injection valve is arranged on water flowing
Outside hole；Pore pressure gauge is installed outside the limbers；Steam vent is offered on the pressing plate, drain tap is in pressing plate
On, it is connected with pressing plate steam vent.
6. energy pile Pile Soil interface mechanicses behavioral trait testing equipment according to claim 1, it is characterised in that described
Loop temperature-control system includes low temperature thermostat bath, water circulating pump, heat exchanger tube, choke valve, current meter；Data collecting system also includes the
Two temperature sensors；The low temperature thermostat bath includes warmer and cooler；The heat exchanger tube is embedded in the concrete hollow
In cylinder；The water circulating pump is used to thermostat interior circulation liquid being pumped into the heat exchanger tube via aqueduct；In the aqueduct
Upper setting choke valve；Second temperature sensor is arranged at the heat exchanger tube inlet and outlet；Another arrangement current meter.
7. energy pile Pile Soil interface mechanicses behavioral trait testing equipment according to claim 1, it is characterised in that described
Vertical pressure loading system uses lever load system, and lever load system includes lever, counterweight, threaded rod, transmission rod；Loading
System is equipped with several levers, is radially distributed, and there is threaded rod centre, and threaded rod surrounding is equipped with steel shaft, and lever one end passes through
Steel shaft is connected on threaded rod, and the other end applies counterweight；Threaded rod one end is threaded, and is connected to by nut on lever, spiral shell
Rasp bar can be moved up and down；Transmission rod lower end is concave shaped, is contacted with pressing plate bearing point.
8. energy pile Pile Soil interface mechanicses behavioral trait testing equipment according to claim 1, it is characterised in that described
Data collecting system also includes transmission rod axial force sensor, for measuring the vertical pressure being applied in ring-type soil sample.
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| CN201720205290.2U CN206531737U (en) | 2017-03-05 | 2017-03-05 | A kind of energy pile stake Soil Interface mechanical behavior attribute testing equipment |
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| CN201720205290.2U CN206531737U (en) | 2017-03-05 | 2017-03-05 | A kind of energy pile stake Soil Interface mechanical behavior attribute testing equipment |
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| CN206531737U true CN206531737U (en) | 2017-09-29 |
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Cited By (8)
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| WO2018161866A1 (en) * | 2017-03-05 | 2018-09-13 | 南京大学 | Device and method for testing mechanical behavior characteristic of pile-soil interface for energy pile |
| CN108709809A (en) * | 2018-01-12 | 2018-10-26 | 中铁二院工程集团有限责任公司 | A kind of simple rock weathering, creep integration experimental rig and test method |
| CN108801807A (en) * | 2018-06-08 | 2018-11-13 | 中南大学 | A kind of pile-soil interface shearing dynamic characteristic test apparatus |
| CN109540690A (en) * | 2018-11-13 | 2019-03-29 | 河海大学 | A kind of pile-soil interface mechanical property testing device based on temperature control triaxial apparatus |
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| WO2018161866A1 (en) * | 2017-03-05 | 2018-09-13 | 南京大学 | Device and method for testing mechanical behavior characteristic of pile-soil interface for energy pile |
| CN108709809A (en) * | 2018-01-12 | 2018-10-26 | 中铁二院工程集团有限责任公司 | A kind of simple rock weathering, creep integration experimental rig and test method |
| CN108801807B (en) * | 2018-06-08 | 2019-10-22 | 中南大学 | A kind of pile-soil interface shearing dynamic characteristic test apparatus |
| CN108801807A (en) * | 2018-06-08 | 2018-11-13 | 中南大学 | A kind of pile-soil interface shearing dynamic characteristic test apparatus |
| US10907320B2 (en) | 2018-06-08 | 2021-02-02 | Central South University | Test apparatus for pile-soil interface shear mechanical properties |
| WO2019232983A1 (en) * | 2018-06-08 | 2019-12-12 | 中南大学 | Pile-soil contact surface shear mechanical property testing equipment |
| CN109540690A (en) * | 2018-11-13 | 2019-03-29 | 河海大学 | A kind of pile-soil interface mechanical property testing device based on temperature control triaxial apparatus |
| CN109556658A (en) * | 2018-12-19 | 2019-04-02 | 青岛理工大学 | A kind of energy pile efficiency of pile groups experimental rig |
| CN109556658B (en) * | 2018-12-19 | 2024-05-10 | 青岛理工大学 | Energy pile group pile effect test device |
| CN109883837A (en) * | 2019-03-22 | 2019-06-14 | 温州大学 | A kind of the Model Pile tester and its test method of controllable soil temperature |
| CN109883837B (en) * | 2019-03-22 | 2021-07-23 | 温州大学 | Model pile tester capable of controlling soil body temperature and testing method thereof |
| CN115478568A (en) * | 2022-08-22 | 2022-12-16 | 宁波大学 | Experimental apparatus is cuted to drainage stake soil contact surface |
| CN115478568B (en) * | 2022-08-22 | 2023-09-29 | 宁波大学 | Pile soil contact surface shearing experiment device for drainage pile |
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