CN110186777A - It is a kind of simulation soil body confining pressure under the conditions of Frozen-thawed cycled testing equipment - Google Patents
It is a kind of simulation soil body confining pressure under the conditions of Frozen-thawed cycled testing equipment Download PDFInfo
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- CN110186777A CN110186777A CN201910461801.0A CN201910461801A CN110186777A CN 110186777 A CN110186777 A CN 110186777A CN 201910461801 A CN201910461801 A CN 201910461801A CN 110186777 A CN110186777 A CN 110186777A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0224—Thermal cycling
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Abstract
It is a kind of simulation soil body confining pressure under the conditions of Frozen-thawed cycled testing equipment, including cryogenic freezing bucket, air compressor machine and freezing liquid refrigeration system, freezing liquid refrigeration system includes freezing liquid refrigeration cycle apparatus, condenser pipe, touch screen control system and temperature sensor, the condenser pipe of freezing liquid refrigeration cycle apparatus passes through the cryogenic freezing bucket from bottom to up, and the other end of condenser pipe is connect with the import of freezing liquid refrigeration cycle apparatus is back to water pump；Water pump is located at the lower section of the freezing liquid refrigeration cycle apparatus, and freezing liquid cooling cycle system display location is in the top of freezing liquid refrigeration cycle apparatus；Cryogenic freezing bucket cylinder bung links air compressor machine by gas conduit.The present invention provide it is a kind of it is low in cost, step is simplified, save the time, accuracy is high, it is widely applicable freeze the testing equipment that confining pressure is controllable when soil sample, freezing-thawing soil sample soil body sample under the conditions of more meeting the actual controllable confining pressure of engineering can be provided for the test of the standard element soil body.
Description
Technical field
The invention belongs to soil mechanics to test field, and the experiment of Frozen-thawed cycled is set under the conditions of being related to a kind of simulation soil body confining pressure
It is standby.
Background technique
Engineering with artificial freezing method construction uses the industry in coal in China earliest, to avoid unstability, leakage etc. occur when sinking shaft
Safety accident.During construction freezing method, frost wall (Frozen Soil Cylinder) forms firm protective layer around pit shaft, not only may be used
Sealing effect is also acted as to enhance soil strength, brings great convenience to construction.The freezing construction technique in China has been at present
Maturation is applied in wider underground engineering.
The time that freezing construction is applied in subway tunnel construction project is later, the north applied to the seventies earliest
Capital subway location.In recent years, China built a large amount of subway tunnels and needs to glue across layer of sand, mud, cobble, sandy gravel stratum, rich water
The bad soil layer such as soil layer, construction freezing method is good with its sealing, intensity is high, the advantages such as safe and reliable these soil property regions gradually
It is universal.Wherein, freezing construction achieves good effect at muddy soft soil location.For silt soil after freezing, intensity is big
Amplitude is promoted, and has been saved supporting expense, has been brought good economic benefit.It is more in Metro Connected Passage-way Construction by taking Hangzhou as an example
Construction freezing method is selected, to solve the problems, such as that support apparatus caused by construction working space is too small is difficult to admission.
However, the temperature recovery later with frozen construction, frozen soil gradually melt, melt the more non-frozen soil of skeleton structure of soil
Huge change, specific manifestation occurs are as follows: macrovoid increases, and fine pore is reduced, and honeycomb occurs.Soil structures caused by freezing
Change causes long-term settlement more non-freeze thawing section in freeze thawing section after subway circulation to increase 5-6 times, and differential settlement is excessive after construction.
The cryogenic vacuum precompressed sample making apparatus for the analog Frozen-thawed cycled environment that confining pressure influences in freezing process is not considered
It succeeds in developing, and has come into operation.However, the soil body undergoes frozen-thaw process under the conditions of confining pressure, confining pressure size and the soil volume change,
The parameters such as setting temperature, melt temperature are closely related.Without freezing curtain in cryogenic freezing soil sample under the conditions of confining pressure and Practical Project
Formation condition differs greatly.Soil mechanics test apparatus such as hydrate triaxial apparatus and Low temperature NMR instrument can be in setting confining pressure conditions
Lower completion is freezed.However instrument is valuable, general unit is difficult to pay its purchase and maintenance cost.And expensive instrument dress sample is cumbersome,
It is extremely low that muddy soft soil fills sample success rate.
Summary of the invention
In order to make up the deficiency that can not restore soil body Freezing-Melting Condition under confining pressure of conventional freeze-thaw testing equipment, the present invention is provided
A kind of confining pressure low in cost, that step is simplified, accuracy is high, widely applicable controllably freezes soil sample testing equipment.The equipment can be with
Freezing-thawing soil body sample under the conditions of controllable confining pressure is provided is tested for the standard element soil body.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of experimental facilities of simulation pressurization Frozen-thawed cycled, including cryogenic freezing bucket, air compressor machine and freezing liquid refrigeration system,
The freezing liquid refrigeration system includes freezing liquid refrigeration cycle apparatus, condenser pipe, touch screen control system and temperature sensor, described
The condenser pipe of freezing liquid refrigeration cycle apparatus passes through the cryogenic freezing bucket, the other end of the condenser pipe and freezing from bottom to up
The import connection of liquid refrigeration cycle apparatus is back to water pump, and the water pump is located at the lower section of the freezing liquid refrigeration cycle apparatus,
The freezing liquid cooling cycle system display location is in the top of freezing liquid refrigeration cycle apparatus；The cryogenic freezing bucket cylinder bung
Air compressor machine is linked by gas conduit；
The cryogenic freezing bucket include vacuum heat-insulation sealing cover, four layers of barrel and moisture recorder composition, the vacuum every
Heat seal lid is by being high pressure resistant material main body, and high pressure sealing rubber ring, laborsaving I-shaped handle forms, and relief valve, pressure is arranged
Table and the threaded hole being connected with the interface of air compressor machine；The barrel is respectively outer layer metal protective layer, macromolecule from outside to inside
Organic hard aluminium foil froth bed, elastic organic material layer, high-end PIR cold insulation tube layer, the interior circulation of the elastic organic material layer are handed over
For condenser pipe is placed, the temperature sensor is placed in the interior of cryogenic freezing bucket, passes through probe precise measurement soil sample internal temperature；
The air compressor machine is oil-free silent air compressor, freezing soil under confining pressure in analog 0-700Kp；Air compressor machine connection pressure
Power meter switch, air compressor machine stops working when a setup pressure value is reached；When pressure value descends below set pressure 10Kp, pneumatics
Machine automatically turns on ftercompction to setting value.
Further, the cryogenic freezing bucket is cylindrical stainless steel barrel, and lower section is laid with 80 layers of geotechnological woven fabric point in it
Absciss layer, bottom are PIR cold insulation tube layer, described to freeze temperature within the barrel recorder, model RC-4HA8000, probe insertion soil sample
Center is every temperature of 15 minutes records, and error is ± 0.1 DEG C, and moisture recorder is powered by button cell, and the used time is
12 months, record after the completion of by data line connect computer can draw out thermograph curve automatically, calculate temperature extremal and
Accurate mean temperature.
Further, the touch screen control system is capacitance plate, can be precisely controlled solidification point by finger touching operation, freeze
Tie time and freeze cycle number.It accidentally touches in order to prevent, touch screen and manual knob start or stop controllable freezing process simultaneously
Beginning and end.Display shows that it monitors the temperature real-time change of every condenser pipe and is recorded as temperature song in freezing process
Line, and data can be automatically saved.
Further, the touch screen control system carries usb interface, and record temperature data can be copied by flash disk.
The capacitor screen roomy bright, image clearly, manual dexterity, screen tilt upwards, facilitate vertical view to operate, meet practical behaviour
Dynamic need in work.
Beneficial effects of the present invention are mainly manifested in:
1) soil sample is placed in setting confining pressure environment during freezing, and is simulated practical frozen construction under the conditions of freezing pressure, is met reality
Border construction operating condition, improves subsequent Thawing soil experimental accuracy and accuracy.
2) present invention can self-clocking, the soil body can manually sets every with cycle-index from freezing duration, guick freezing room, time knot
Beam warning reminding.
3) temperature of the present invention can record in real time, and condenser pipe temperature and soil sample internal temperature can record simultaneously and be depicted as song
Line, it is careful to the control of soil sample frozen-thaw process accurate.
4) not only low-temperature resistance, heat-insulating capability are good using high-end PIR cold insulation tube layer by the present invention, and negative pressure ability is good.It reduces outer
Portion's condenser pipe temperature losses reduce energy consumption.
5) the setting Pass Test demand of touch screen, equipment passes through display screen during the work time can be monitored in real time every
Pipe temperature.
6) for the present invention using salting liquid as refrigerant agent, the service life is long, uses stable and equipment operation safety.
Detailed description of the invention
Fig. 1 is that soil sample freezes barrel structure schematic diagram.
Fig. 2 is that temperature control and refrigerating fluid recycle integrated equipment schematic diagram.
Fig. 3 is air Compressor unit structure.
Fig. 4 is apparatus structure top view.
Fig. 5 is device appearance main view.
Fig. 6 is device appearance right view.
In figure: Fig. 1 is that soil sample freezes bucket, and Fig. 2 is freezing liquid refrigeration system, and Fig. 3 is air compressor machine.In the cooling bucket of soil sample, 1
It is handle for vacuum heat-insulation sealing cover, 2,3 be high pressure sealing rubber ring, and 4 be outer protective layer, and 5 be the organic hard aluminium of macromolecule
Foil froth bed, 6 be elastic organic material, and 7 be separating layer, and 11 be water outlet, and 13 be water inlet, and 33 be high-end PIR cold insulation tube layer,
34 be condenser pipe, and 35 be temperature monitor, and 36 be bolt, and 37 be dial plate, and 38 be gas outlet.In cold liquid circulation integrated equipment, 8
To control equipment, 9 be shell, and 10 be heat preservation heat insulation layer, and 13 be water outlet, and 14 be handle, and 18 be USB interface, and 16 be handle, 28
It is water inlet for touch screen, 31.In air compressor machine, 17 be mute cotton, and 18 be full copper machine, and 19 be quality product capacitor, and 20 be wear-resisting
Rubber shock-absorbing wheel, 21 be drain valve, and 22 be switch button, and 23 be air gauge, and 24 be fast interface, and 25 be mobile handrail, and 26 are
Yielding rubber Slippery proof foot pad, 27 be compressed air pump, and 29 be air gauge, and 30 be pressure controller.
Specific embodiment
The present invention is described further with reference to the accompanying drawing
Referring to Fig.1~Fig. 6, a kind of simulation pressurization freeze-thaw cycle experiment equipment, including soil sample freeze bucket Fig. 1, freezing liquid system
The top of cooling system Fig. 2 and air compressor machine Fig. 3, the soil sample freezing bucket are vacuum heat-insulation sealing cover 32.In the soil sample freezing bucket
The bucket wall one in portion shares four layers, is that outer protective layer 4, the organic hard aluminium foil froth bed 5 of macromolecule, elasticity have respectively from outside to inside
Machine material layer 6, high-end PIR cold insulation tube layer 33.The high-end PIR cold insulation tube layer 33 of innermost layer can be stable maintain bucket in temperature
To reach the authenticity of simulation.Circulation is placed condenser pipe 34 in elastic organic material layer 6, has point in soil sample freezing bucket bottom
Absciss layer 7, for accurate monitoring temperature within the barrel, soil sample freezes bucket inner wall and is equipped with temperature monitor 35.One end of the condenser pipe enters water
The water outlets 13 that mouth 12 should recycle integrated equipment with refrigerating fluid be connected, and the other end water outlet of condenser pipe should be recycled with refrigerating fluid
The water inlet 31 of integrated equipment is connected.The control of equipment 8 is wanted and controlled to temperature monitor 35 on present apparatus soil sample freezing bucket inner wall
The temperature controlling instruments of system is connected.
The air pump 27 of described air compressor machine Fig. 3 should be connected with Fig. 3 on vacuum heat-insulation sealing cover, for pressure limit 0-
700kp, when doing simulated experiment pressure range control in 0-500pa, pressure controller 30 must be bundled on air pump 27 with
Just the variation of detection air pressure in real time determines how adjusting air pressure change through the atmospheric pressure value of the display of air gauge 29.Air compressor machine
Switch 22 can make switch machine and use, and air compressor machine can also be forcibly closed when machine pressure reaches maximum, is avoided because air pressure is excessive
The accident of generation.Mute cotton 17 can effectively reduce the noise of air compressor machine, provide a relatively quiet environment to experimenter.
Air compressor machine can be effectively protected in air compressor machine transportational process in yielding rubber 26.
Described freezing liquid refrigeration system Fig. 2, top are divided into console, and lower part is refrigerating fluid recycle unit.Water outlet 13
It is hydronic in order to carry out with water inlet 31.Handle 16 is pulled out, coolant liquid can be added into device, it is easy to operate.
Three 8 controllable switch of button also can control the functions such as duration and timing.28 be touch screen, and touch screen not only has adjusting temperature
With the function of cooling duration, temperature and pressure history can also be drawn automatically, and can protect experimental data automatically, effectively prevent
The case where being lost because of experimental data caused by accident power-off.Usb 18 can export data obtained in experiment, and USB flash disk is
Plug-and-play, it is convenient and efficient, the time of data statistics arrangement can be greatly reduced.
All shells are stainless steel material in this experimental provision, and the specification of each experimental provision is moderate, and land occupation is empty
Between it is small.Wherein, the diameter of soil sample freezing bucket is 400mm, is highly 660mm, and it is 12mm that diameter is had on vacuum heat-insulation sealing cover
Drain tap, soil sample freezing bucket inner wall 33 on be mounted with temperature monitor 35.
Refrigerating fluid circulation integrated equipment and temperature control equipment 8 are a system in the device, and temperature control equipment is put
Enter in black rectangle box, then is fixed on above refrigerating fluid circulation integrated equipment by steel pipe.Temperature control system is controlled by Trackpad.
Pressure sensor 30 should be connected with air compressor machine 27, can observe at any time air pressure and adjust in time.On soil sample freezing bucket inner wall
Temperature monitor can record temperature in real time, and feed back to temperature control system at once.Testing obtained result all can be real-time
It is shown in display screen, facilitates testing crew observation either adjustment cryogenic temperature and duration.
In the present embodiment, soil sample is placed in setting confining pressure environment during freezing, and is simulated under the conditions of reality freezes pressure and is freezed to apply
Work meets practice of construction operating condition, improves subsequent Thawing soil experimental accuracy and accuracy.
For the present invention using salting liquid as refrigerant agent, the service life is long, uses stable and equipment operation safety.
The operating instruction of the present embodiment:
1) it opens to freeze and presses integrated testing equipment power supply, prefabricated saturation soil sample is put into freeze thawing case, close sealing cover, pressurization
Pressure is set to test.
2) it operates touch screen and selects solidification point, freeze duration, cycle-index.
3) start freezing procedures, terminate test and close instrument.
Above-described embodiment is a kind of preferred version of the invention, however is not intended to limit the invention.Have
The those of ordinary skill for closing technical field can also make various changes without departing from the spirit and scope of the present invention
Change and modification.Therefore all mode technical solutions obtained for taking equivalent substitution or equivalent transformation, all fall within guarantor of the invention
It protects in range.
Claims (6)
1. a kind of experimental facilities of simulation pressurization Frozen-thawed cycled, it is characterised in that: including cryogenic freezing bucket, air compressor machine and freezing liquid
Refrigeration system, the freezing liquid refrigeration system include that freezing liquid refrigeration cycle apparatus, condenser pipe, touch screen control system and temperature pass
Sensor, the freezing liquid cooling cycle system display location is in the top of freezing liquid refrigeration cycle apparatus；The condenser pipe is under
Supreme to pass through the cryogenic freezing bucket, the other end of the condenser pipe is connect with the import of freezing liquid refrigeration cycle apparatus to be back to
Water pump, the lower section cryogenic freezing bucket cylinder bung that the water pump is located at the freezing liquid refrigeration cycle apparatus pass through gas conduit
Link air compressor machine；
The cryogenic freezing bucket includes that vacuum heat-insulation sealing cover, four layers of barrel and moisture recorder composition, the vacuum heat-insulation are close
Capping is by being high pressure resistant material main body, high pressure sealing rubber ring, and laborsaving I-shaped handle forms, the high pressure resistant material of heat-insulating and sealing lid
Matter main body installation relief valve, pressure gauge and the threaded hole being connected with the interface of air compressor machine, the barrel are respectively from outside to inside
The organic hard aluminium foil froth bed of outer layer metal protective layer, macromolecule, elastic organic material layer, high-end PIR cold insulation tube layer, the bullet
Property organic material layer in cycle alternation place condenser pipe；The temperature sensor is placed in the interior of cryogenic freezing bucket, passes through probe
Precise measurement soil sample internal temperature；
The air compressor machine is oil-free silent air compressor, and freezing soil under confining pressure, air compressor machine connect pressure gauge in analog 0-700kp
Switch, air compressor machine stops working when a setup pressure value is reached.
2. the experimental facilities of simulation pressurization Frozen-thawed cycled as described in claim 1, it is characterised in that: cryogenic freezing bucket is cylinder
Shape stainless steel barrel, lower section is laid with 80 layers of geotechnological woven fabric separating layer in it, and bottom is PIR cold insulation tube layer.
3. the experimental facilities of simulation pressurization Frozen-thawed cycled as claimed in claim 2, it is characterised in that: moisture recorder is by button
Battery power supply, used time are 12 months, and thermograph song can be drawn out automatically by connecting computer by data line after the completion of record
Line calculates temperature extremal and accurate mean temperature.
4. the experimental facilities of the simulation pressurization Frozen-thawed cycled as described in one of claims 1 to 3, it is characterised in that: the touch screen
Control system is capacitance plate, and display shows that it monitors the temperature real-time change of every condenser pipe and is recorded as temperature in freezing process
It writes music line, and can automatically save, data will not lose after flash memory capability can guarantee accident power-off.
5. the experimental facilities of simulation pressurization Frozen-thawed cycled as claimed in claim 4, it is characterised in that: the touch screen control system
Included usb interface, record temperature data can be copied by flash disk.
6. the experimental facilities of simulation pressurization Frozen-thawed cycled as claimed in claim 4, it is characterised in that: the roomy bright, figure of screen
As clear, manual dexterity, screen tilts upwards, facilitates vertical view to operate, meets the dynamic need of people in actual operation.
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Cited By (4)
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| CN111735846A (en) * | 2020-07-16 | 2020-10-02 | 安徽理工大学 | Device and method for testing heat preservation and cold insulation performance of material under confining pressure |
| CN112098231A (en) * | 2020-10-12 | 2020-12-18 | 黑龙江省水利科学研究院 | Large triaxial mechanical test device and test method for simulating freeze-thaw cycle coarse-grained soil |
| CN114923768A (en) * | 2022-05-19 | 2022-08-19 | 西南石油大学 | Nondestructive dismounting type high-temperature high-pressure rock core holder device |
| CN116068470A (en) * | 2023-03-07 | 2023-05-05 | 吉林大学 | Sample temperature control device in nuclear magnetic resonance testing process |
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