CN108614089A - Compacted fill freeze thawing and weathering environmental simulation system and its test method - Google Patents
Compacted fill freeze thawing and weathering environmental simulation system and its test method Download PDFInfo
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- CN108614089A CN108614089A CN201810436684.8A CN201810436684A CN108614089A CN 108614089 A CN108614089 A CN 108614089A CN 201810436684 A CN201810436684 A CN 201810436684A CN 108614089 A CN108614089 A CN 108614089A
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Abstract
A kind of compacted fill freeze thawing of invention offer and weathering environmental simulation system and its test method.The device includes the LED daylight lamp being placed on experiment porch, liquid nitrogen frozen recycle unit, freeze thawing model casing, nitrogen heating recycle unit and wind devices processed.Soil sample is housed in the inner cavity of the freeze thawing model casing.When work, computer controls refrigerating cycle apparatus, nitrogen heating recycle unit and wind devices processed.The dynamic video camera monitoring soil sample freezes character.The test method of the device, including lay sensor, hit the test procedures such as real soil sample, installation monitoring device, tune-up data Acquisition Processor and Frozen-thawed cycled controller.The device can control the action time of Frozen-thawed cycled, realize the automation of winter frozen soil simulation.It can observe and measure the change in displacement of the soil body.Thin sight characteristic during observable specimen test.
Description
Technical field
The present invention relates to engineering cryopedology technical fields, and in particular to a kind of compacted fill freeze thawing and weathering environmental simulation system
System.
Background technology
Frozen soil refer to temperature at 0 DEG C or 0 DEG C hereinafter, and the various rocks containing ice and soil, it is extremely sensitive to temperature, contain
There is abundant ground ice.Therefore, there is frozen soil rheological characteristic, long-term strength to be far below instantaneous strength feature.Just because of these
Characteristic, two big danger must just be faced by building engineering structure in permafrost region：Frost heave and thaw collapse.What is wherein played an important role is water
Existing forms, when water becomes ice, volume increases, and makes soil expansion, and earth's surface therefore raising of arching upward, here it is frost heaves；Work as soil
In ice when being changed into water, thaw subsidence, abbreviation thaw collapse just occur for volume contraction, earth's surface.In the work repeatedly of both phenomenons
Under, the substrate in road or house just will appear rupture or collapse.Therefore, Frozen Ground Area carry out hydraulic engineering, industry with
The construction of civil buildings and Communication and Transportation Engineering, a series of engineerings that must just interact to frozen soil and its with engineering works
Cryopedology theory and practice problem makes answer, to ensure the stability of engineering works, durability and economy on frozen soil foundation
Reasonability.
In the prior art, the only simple unfreezing for simulating frozen soil, is short of with current conditions.It does not account for existing
The influence that field weathering and solar irradiation act on frozen soil, and monitor variation therein.
Therefore, there is an urgent need for develop it is a kind of can the Detailed simulation winter construction soil body freeze thawing variation simulator.
Invention content
The object of the present invention is to provide a kind of compacted fill freeze thawing and weathering environmental simulation system and its test methods, with solution
Certainly problems of the prior art.
To realize the present invention purpose and the technical solution adopted is that such, compacted fill freeze thawing and weathering environmental simulation system
System, including the freeze thawing model casing that is placed on experiment porch, and the LED daylight lamp that is arranged in outside freeze thawing model casing, liquid nitrogen are cold
Freeze recycle unit, nitrogen heating recycle unit and wind devices processed.
The transparent rectangular babinet of the freeze thawing model casing generally upper end opening.The outer wall of the freeze thawing model casing is covered with
Bright heat-barrier material.Several sensor lead mouths are disposed on the inner wall of the freeze thawing model casing.The sensor lead mouth connects
Enter temperature or displacement data acquisition system.Soil sample is housed in the inner cavity of the freeze thawing model casing.It is embedded in the soil sample
The temperature sensor of several displacement sensors and corresponding number.It is packaged with inner cavity chamber in the tank wall of the freeze thawing model casing.Institute
Inner cavity chamber is stated to be connected to liquid nitrogen frozen recycle unit and nitrogen heating recycle unit by bend pipe.
The LED daylight lamp includes supporting rack, connecting rod and fluorescent lamp ontology.Support frame as described above includes fixed cross beam.Institute
Fixed cross beam is stated to be arranged in above freeze thawing model casing.The connecting rod upper end is flexibly connected with fixed cross beam, lower end and fluorescent lamp
Ontology is flexibly connected.The connecting rod can be slided along fixed cross beam level.The fluorescent lamp ontology can be rotated around connecting rod lower end.
Data collection processor and dynamic video camera are there also is provided outside the freeze thawing model casing.The dynamic video camera, position
It moves inductor and temperature sensor is connected with data collection processor.The data collection processor is connected with computer.
When work, the fluorescent lamp ontology irradiates soil sample.The wind devices processed 13 generate air-flow and uniformly transfer to soil examination
Sample surface.The computer control liquid nitrogen frozen recycle unit or nitrogen heating recycle unit work.The liquid nitrogen frozen cycle
Liquid nitrogen is passed through in inner cavity chamber by equipment, cooling soil body sample.Heated nitrogen is passed through inner cavity chamber by the nitrogen heating recycle unit
It is interior, soil body sample is heated, realizes Frozen-thawed cycled.The temperature sensor monitors the temperature change in sample in real time.Institute
State the displacement data of different location inside displacement sensor record soil sample.The variation diagram of the dynamic video camera shooting soil sample
As information.The monitoring data of the data collection processor acquisition storage dynamic video camera, displacement sensor and temperature sensor
Afterwards, it is transferred to computer.
Further, the wind devices processed include gas source, the control of cold and hot temperature, humidification Dehumidification controlling and parallel air outlet.
The wind devices processed can generate the air-flow containing a certain amount of moisture and temperature.
Further, liquid nitrogen is passed through from inner cavity chamber bottom, top outflow, and is flowed back into freeze cycle control device.Heating
Nitrogen is passed through from inner cavity chamber bottom, top outflow, and is flowed back into nitrogen heating recycle unit.
Further, the displacement sensor is cyclic annular displacement magnetic inductor.The spherical temperature sensor of temperature sensor.
The spherical temperature sensor is firm to be nested in corresponding cyclic annular displacement magnetic inductor.
Invention additionally discloses a kind of application methods about above-mentioned compacted fill freeze thawing and weathering environmental simulation system, including
Following steps：
1) according to experiment demand, displacement sensor and temperature sensor are laid in freeze thawing model box cavity.In freeze thawing mould
The outer wall of molding box is designed as transparent heat-insulated material.
2) soil sample is put into freeze thawing model box cavity and hits reality.
3) computer, data collection processor and dynamic video camera are debugged.
4) liquid nitrogen frozen recycle unit freezes by design requirement.Nitrogen heats recycle unit by design requirement system
Heat.Wind devices processed generate parallel airflow by design requirement.Data collection processor acquires and records data.
5) position, angle and the intensity for adjusting fluorescent lamp ontology, are irradiated soil sample.Wind devices processed are by design requirement
Generate air-flow.Data collection processor acquires and records data.
6) computer carries out analyzing processing to data collection processor record data.
The solution have the advantages that unquestionable：
A. the action time that can control Frozen-thawed cycled, the automation of winter frozen soil simulation is realized；
B. the Frozen-thawed cycled effect under different sunlight can be simulated.It can carry out freeze thawing of the simulation winter soil body under weathering environment
Cycle；
C. it can observe and measure the change in displacement of the soil body.Thin sight characteristic during observable specimen test；
D. the sample item after testing is easy to collect.
Description of the drawings
Fig. 1 is apparatus structure schematic diagram；
Fig. 2 is freeze thawing model casing and LED daylight lamp layout drawing；
Fig. 3 is freeze thawing mold box configuration schematic diagram；
Fig. 4 is body structure cut away view；
Fig. 5 is sample cut away view；
Fig. 6 is deformation test method flow diagram.
In figure：Computer 1, data collection processor 2, dynamic video camera 3, LED daylight lamp 4, supporting rack 401, fixed cross
Beam 4011, connecting rod 402, fluorescent lamp ontology 403, displacement sensor 5, temperature sensor 6, transparent heat-insulated material 7, liquid nitrogen frozen
Recycle unit 8, freeze thawing model casing 9, cavity body 901, heated nitrogen entrance 902, liquid nitrogen outlet 903, liquid nitrogen entrance 904, heating
Nitrogen outlet 905, nitrogen heating recycle unit 10, soil sample 11, wind devices processed 13, gas source 1301, the control of cold and hot temperature
1302, Dehumidification controlling 1303, parallel air outlet 1304, sensor lead mouth 14 are humidified.
Specific implementation mode
With reference to embodiment, the invention will be further described, but should not be construed the above-mentioned subject area of the present invention only
It is limited to following embodiments.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and used
With means, various replacements and change are made, should all include within the scope of the present invention.
Embodiment 1：
Referring to Fig. 1, the present embodiment discloses a kind of compacted fill freeze thawing and weathering environmental simulation system, including is placed on experiment
Freeze thawing model casing 9 on platform, and be arranged in outside freeze thawing model casing 9 LED daylight lamp 4, liquid nitrogen frozen recycle unit 8, nitrogen
Gas heats recycle unit 10 and wind devices 13 processed.
The transparent rectangular babinet of the generally upper end opening of the freeze thawing model casing 9.The outer wall of the freeze thawing model casing 9 is covered with
Transparent heat-insulated material 7.Several sensor lead mouths 14 are disposed on the inner wall of the freeze thawing model casing 9.The sensor draws
14 cut-in temperature of line mouth or displacement data acquisition system.Soil sample 11 is housed in the inner cavity of the freeze thawing model casing 9.Referring to Fig. 5,
Multiple displacement sensors 5 and the temperature sensor 6 of corresponding number are embedded in the soil sample 11.The displacement sensor 5 is
Cyclic annular displacement magnetic inductor.6 spherical temperature sensor of the temperature sensor.The spherical temperature sensor is firm to be nested in pair
In the cyclic annular displacement magnetic inductor answered.Four side box walls of the freeze thawing model casing 9 successively be labeled as the first tank wall, the second tank wall,
Third tank wall and the 4th tank wall.Referring to Fig. 3, four side box walls of the freeze thawing model casing 9 are cavity structure.The sky of four side box walls
Cavity configuration surrounds inner cavity chamber 901.Heated nitrogen entrance 902 and liquid nitrogen outlet 903 are offered on the outer wall of first tank wall.
The liquid nitrogen outlet 903 is arranged in 902 top of heated nitrogen entrance.Liquid nitrogen entrance is offered on the outer wall of second tank wall
904 and heated nitrogen outlet 905.The heated nitrogen outlet 905 is arranged in 904 top of liquid nitrogen entrance.The third tank wall
Heated nitrogen entrance 902 and liquid nitrogen outlet 903 are offered on outer wall.The liquid nitrogen outlet 903 is arranged in heated nitrogen entrance 902
Top.Liquid nitrogen entrance 904 and heated nitrogen outlet 905 are offered on the outer wall of 4th tank wall.The heated nitrogen outlet
905 are arranged in 904 top of liquid nitrogen entrance.The heated nitrogen entrance 902, liquid nitrogen outlet 903, liquid nitrogen entrance 904 and heating nitrogen
The connection inner cavity chamber 901 of gas outlet 905 and outside.The liquid nitrogen frozen recycle unit 8 passes through liquid nitrogen outlet 903 and liquid nitrogen entrance
904 are connected to inner cavity chamber 901.The nitrogen heating recycle unit 10 passes through heated nitrogen entrance 902 and heated nitrogen outlet 905
It is connected to inner cavity chamber 901.
Referring to Fig. 2, the LED daylight lamp 4 includes supporting rack 401, connecting rod 402 and fluorescent lamp ontology 403.The support
Frame 401 includes fixed cross beam 4011.The fixed cross beam 4011 is arranged in 9 top of freeze thawing model casing.402 upper end of the connecting rod
It is flexibly connected with fixed cross beam 4011, lower end is flexibly connected with fluorescent lamp ontology 403.The connecting rod 402 can be along fixed cross beam
4011 horizontal slidings.The fluorescent lamp ontology 403 can be rotated around 402 lower end of connecting rod.
Data collection processor 2 and dynamic video camera 3 are there also is provided outside the freeze thawing model casing 9.The dynamic video camera
3, displacement sensor 5 and temperature sensor 6 are connected with data collection processor 2.The data collection processor 2 and computer
1 is connected.
The wind devices processed 13 include gas source 1301, cold and hot temperature control 1302, humidification Dehumidification controlling 1303 with it is parallel
Air outlet 1304.The wind devices processed 13 can generate the air-flow containing a certain amount of moisture and temperature.
When work, the fluorescent lamp ontology 403 irradiates soil sample 11.The wind devices processed 13, which generate, contains a certain amount of water
Divide, the air-flow of certain temperature is uniformly transferred to 11 surface of soil sample.The computer 1 controls liquid nitrogen frozen recycle unit 8 or nitrogen
Gas heats recycle unit 10 and works.Referring to Fig. 3, arrow indicates the flow direction of liquid nitrogen or heated nitrogen in figure.The liquid nitrogen is cold
Freeze recycle unit 8 liquid nitrogen is passed through in inner cavity chamber 901, cooling soil body sample 11.Liquid nitrogen is passed through from 901 bottom of inner cavity chamber, top
Outflow, and flow back into freeze cycle control device 8.Heated nitrogen is passed through inner cavity chamber by the nitrogen heating recycle unit 10
In 901, soil body sample 11 is heated, realizes Frozen-thawed cycled.Heated nitrogen is passed through from 901 bottom of inner cavity chamber, top outflow,
And it flows back into nitrogen heating recycle unit 10.The temperature sensor 6 monitors the temperature change in sample 11 in real time.Institute's rheme
Move 11 displacement data of soil sample that inductor 5 records different direction.The dynamic video camera 3 shoots the modified-image of soil sample 11
Information.The monitoring number of the acquisition storage dynamic of the data collection processor 2 video camera 3, displacement sensor 5 and temperature sensor 6
According to rear, it is transferred to computer 1.
Embodiment 2：
Referring to Fig. 6, the present embodiment discloses one kind about compacted fill freeze thawing described in embodiment 1 and weathering environmental simulation system
Test method, include the following steps：
1) according to experiment demand, displacement sensor 5 and temperature sensor 6 are laid in 9 inner cavity of freeze thawing model casing.In freeze thawing
The outer wall of model casing 9 lays transparent heat-insulated material 7.
2) soil sample 11 is put into 9 inner cavity of freeze thawing model casing and hits reality.
3) computer 1, data collection processor 2 and dynamic video camera 3 are debugged.
4) liquid nitrogen frozen recycle unit 8 freezes by design requirement.Nitrogen heat recycle unit 10 by design requirement into
Row heating.Wind devices 13 processed generate the parallel airflow with moisture by design requirement.Data collection processor 2 acquires and records number
According to.
5) position, angle and the intensity of adjustment fluorescent lamp ontology 403, is irradiated soil sample 11.Wind devices 13 processed by
Design requirement generates air-flow.Data collection processor 2 acquires and records data.
6) computer 1 records data to data collection processor 2 and carries out analyzing processing.
It is worth noting that Frozen-thawed cycled of the present embodiment by the simulation winter soil body, to realize the prison endangered frozen soil
It surveys, due to considering the effect of weathering and the effect of sunlight, the frozen soil that the condition of simulation frozen soil is closer in reality is made to become
Change.
Claims (5)
1. compacted fill freeze thawing and weathering environmental simulation system, it is characterised in that：Including the freeze thawing mould being placed on experiment porch
Molding box (9), and it is arranged in the outer LED daylight lamp (4) of freeze thawing model casing (9), liquid nitrogen frozen recycle unit (8), nitrogen heating
Recycle unit (10) and wind devices processed (13)；
The transparent rectangular babinet of the freeze thawing model casing (9) generally upper end opening；The outer wall of the freeze thawing model casing (9) is covered with
Transparent heat-insulated material (7)；Several sensor lead mouths (14) are disposed on the inner wall of the freeze thawing model casing (9)；The biography
Sensor lead wire outlet (14) cut-in temperature or displacement data acquisition system；Soil sample is housed in the inner cavity of the freeze thawing model casing (9)
(11)；Several displacement sensors (5) and the temperature sensor (6) of corresponding number are embedded in the soil sample (11).It is described
Inner cavity chamber (901) is packaged in the tank wall of freeze thawing model casing (9)；The inner cavity chamber (901) is recycled by bend pipe and liquid nitrogen frozen
Equipment (8) and nitrogen heating recycle unit (10) are connected to；
The LED daylight lamp (4) includes supporting rack (401), connecting rod (402) and fluorescent lamp ontology (403)；Support frame as described above
(401) include fixed cross beam (4011)；The fixed cross beam (4011) is arranged in 9 top of freeze thawing model casing；The connecting rod
(402) upper end is flexibly connected with fixed cross beam (4011), and lower end is flexibly connected with fluorescent lamp ontology (403)；The connecting rod
It (402) can be along the horizontal sliding of fixed cross beam (4011)；The fluorescent lamp ontology (403) can rotate around connecting rod (402) lower end；
Data collection processor (2) and dynamic video camera (3) are there also is provided outside the freeze thawing model casing (9)；The dynamic camera shooting
Instrument (3), displacement sensor (5) and temperature sensor (6) are connected with data collection processor (2)；The data acquisition process
Device (2) is connected with computer (1)；
When work, fluorescent lamp ontology (403) the irradiation soil sample (11)；The wind devices processed 13 generate air-flow uniformly transfer to
Soil sample (11) surface；Computer (1) the control liquid nitrogen frozen recycle unit (8) or nitrogen heat recycle unit (10) work
Make；Liquid nitrogen is passed through in inner cavity chamber (901) by the liquid nitrogen frozen recycle unit (8), cooling soil body sample (11)；The nitrogen system
Heated nitrogen is passed through in inner cavity chamber (901) by heat circulating equipment (10), is heated to soil body sample (11), realizes that freeze thawing follows
Ring；The temperature sensor (6) monitors the temperature change in sample (11) in real time；The displacement sensor (5) records soil sample
(11) displacement data of internal different location；The modified-image information of dynamic video camera (3) the shooting soil sample (11)；It is described
The monitoring data of data collection processor (2) acquisition storage dynamic video camera (3), displacement sensor (5) and temperature sensor (6)
Afterwards, it is transferred to computer (1).
2. compacted fill freeze thawing according to claim 1 and weathering environmental simulation system, it is characterised in that：The wind processed is set
Standby (13) include gas source (1301), cold and hot temperature control (1302), humidification Dehumidification controlling (1303) and parallel air outlet
(1304)；The wind devices processed (13) can generate the air-flow containing a certain amount of moisture and temperature.
3. compacted fill freeze thawing according to claim 3 and weathering environmental simulation system, it is characterised in that：Liquid nitrogen is from inner cavity
Room (901) bottom is passed through, top outflow, and is flowed back into freeze cycle control device (8)；Heated nitrogen is from inner cavity chamber (901)
Bottom is passed through, top outflow, and is flowed back into nitrogen heating recycle unit (10).
4. compacted fill freeze thawing according to claim 1 and weathering environmental simulation system, it is characterised in that：The displacement sense
It is cyclic annular displacement magnetic inductor to answer device (5)；The spherical temperature sensor of the temperature sensor (6)；The spherical temperature sensor
It is firm to be nested in corresponding cyclic annular displacement magnetic inductor.
5. a kind of test method about compacted fill freeze thawing and weathering environmental simulation system described in claim 1, feature exists
In including the following steps：
1) according to experiment demand, displacement sensor (5) and temperature sensor (6) are laid in freeze thawing model casing (9) inner cavity；Freezing
The outer wall for melting model casing (9) lays transparent heat-insulated material (7)；
2) soil sample (11) is put into freeze thawing model casing (9) inner cavity and hits reality；
3) debugging computer (1), data collection processor (2) and dynamic video camera (3)；
4) liquid nitrogen frozen recycle unit (8) freezes by design requirement；Nitrogen heat recycle unit (10) by design requirement into
Row heating；Wind devices (13) processed generate parallel airflow by design requirement；Data collection processor (2) acquires and records data；
5) position, angle and the intensity of adjustment fluorescent lamp ontology (403), is irradiated soil sample (11)；Wind devices (13) processed
Air-flow is generated by design requirement；Data collection processor (2) acquires and records data；
6) computer (1) carries out analyzing processing to data collection processor (2) record data.
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