CN110108748A - Frost heave experimental provision - Google Patents
Frost heave experimental provision Download PDFInfo
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- CN110108748A CN110108748A CN201910490231.8A CN201910490231A CN110108748A CN 110108748 A CN110108748 A CN 110108748A CN 201910490231 A CN201910490231 A CN 201910490231A CN 110108748 A CN110108748 A CN 110108748A
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- 238000007710 freezing Methods 0.000 claims abstract description 61
- 230000008014 freezing Effects 0.000 claims abstract description 61
- 238000001816 cooling Methods 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 238000005057 refrigeration Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 45
- 238000007405 data analysis Methods 0.000 claims description 13
- 238000013480 data collection Methods 0.000 claims description 13
- 238000013508 migration Methods 0.000 claims description 11
- 230000005012 migration Effects 0.000 claims description 11
- 238000007689 inspection Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 22
- 230000008569 process Effects 0.000 abstract description 19
- 239000002689 soil Substances 0.000 abstract description 18
- 238000010276 construction Methods 0.000 abstract description 7
- 239000011435 rock Substances 0.000 abstract description 5
- 238000011160 research Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000009897 systematic effect Effects 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 11
- 239000007788 liquid Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 230000005945 translocation Effects 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910052770 Uranium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000015110 jellies Nutrition 0.000 description 2
- 239000008274 jelly Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 210000000582 semen Anatomy 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/16—Investigating or analyzing materials by the use of thermal means by investigating thermal coefficient of expansion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
- G01N33/246—Earth materials for water content
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A kind of frost heave experimental provision, comprising: cold end end cap and room temperature end end cap are arranged on sample container, ground sample is filled in sample container for sample container；Refrigeration system, refrigeration system include freezing unit, and freezing unit includes cooling capacity discharge conduit, and cooling capacity discharge conduit is set on cold end end cap；Freezing front migrates detection system, and it includes power supply that freezing front, which migrates detection system, and power supply includes positive terminal and negative pole end, is in series with ammeter with power supply, is parallel with voltmeter.By the measurement for loading length, room temperature ground density, Frozen Rock and Soil density, current value and voltage value to ground, so that it may migrate detection system by freezing front and be measured to the length of Frozen Rock and Soil, to obtain the transfer parameter of freezing front.The present invention can carry out comprehensive and systematic research to freezing heave behavior caused in frozen construction engineering, and the further genralrlization use for artificially layer freezing process provides reference frame.
Description
Technical field
The present invention relates to civil engineering test equipment technical fields, more specifically, in particular to a kind of frost heave experiment dress
It sets.
Background technique
Artificial stratum freezing process is exactly to make the water freezing in stratum using artificial cooling technology, natural Rock And Soil is become
Frozen soil, increases its strength and stability, completely cuts off contacting for underground water and underground engineering, to guarantee mine shaft or underground engineering pick
Build the special constructional technique of construction.
Artificial stratum freezing process needs to carry out frost heave experiment to ground before implementation, to obtain the frost heave parameter of ground, from
And determine optimal arrangement and method for construction.Used frost heave experimental provision in the prior art, being only can be cold to ground progress
Freeze, ground character parameter can be obtained after freezing.
Since existing frost heave experimental provision can not obtain change of temperature field, change of stress field of the ground in freezing process
And water translocation situation can not embody ground freezing process if simple rely on freezes rear ground character parameter comprehensively
Physical behavior variation, then existing frost heave experimental provision just can not provide support for artificially the perfect of layer freezing process.
Summary of the invention
In conclusion the transfer parameter of ground freezing front in ground freezing process can be obtained by how providing one kind
The frost heave experimental provision taken, becomes those skilled in the art's urgent problem to be solved.
To achieve the goals above, the invention provides the following technical scheme:
A kind of frost heave experimental provision, comprising:
For loading the sample container of ground sample, cold end window and room temperature end window are offered on the sample container
Mouthful, the cold end window is oppositely arranged with the room temperature end window mouth, is provided with cold end end cap, Yu Suoshu on Yu Suoshu cold end window
Room temperature end end cap is provided on room temperature end window mouth；
Refrigeration system, the refrigeration system include for providing the freezing unit of cooling capacity, and the freezing unit includes
Cooling capacity discharge conduit, the cooling capacity discharge conduit are set on the cold end end cap, for the release of cooling capacity；
Freezing front migrates detection system, and the freezing front migration detection system includes power supply, and the power supply includes
There are positive terminal and negative pole end, the positive terminal and the negative pole end are divided into the cold end end cap and room temperature end end
It covers, for loading positive electrode current and negative electricity to the ground sample at the cold end window and the room temperature end window mouth
Stream, is in series with ammeter with the power supply, is parallel with voltmeter.
Preferably, the positive terminal is provided with positive gasket, and the anode gasket is set to the cold end end cap or described
On the end cap of room temperature end；The negative pole end is provided with cathode gasket, and the cathode gasket is set to room temperature end end cap or described
On cold end end cap.
Preferably, the power supply is DC power supply.
Preferably, the invention also includes have noncryogenic system；The noncryogenic system includes the water for exporting room temperature water flow
Pump, is connected with normal temperature water pipe with the water outlet of the water pump, the normal temperature water pipe is set on the end cap of the room temperature end.
Preferably, the sample container is the tubular structure that cross section is regular shape.
Preferably, the cooling capacity discharge conduit is helical coiled tube structure setting on the medial surface of the cold end end cap；
The normal temperature water pipe is helical coiled tube structure setting on the medial surface of room temperature end end cap.
Preferably, the invention also includes there is comprehensive parameters to obtain system, it includes data that the comprehensive parameters, which obtain system,
Acquisition and analysis instrument；It further includes having the temperature information for obtaining ground specimen temperature information to obtain that the comprehensive parameters, which obtain system,
Component, the temperature information securing component connect with the data collection and analysis instrument signal and are set in the sample container.
Preferably, it further includes the moisture information having for obtaining ground sample moisture information that the comprehensive parameters, which obtain system,
Securing component, the moisture information securing component, which connect with the data collection and analysis instrument signal and is set to the sample, to be held
In device.
Preferably, it further includes the stress having for obtaining ground sample ess-strain information that the comprehensive parameters, which obtain system,
Strain information securing component, the ess-strain information acquisition component connect and are arranged with the data collection and analysis instrument signal
In in the sample container.
Preferably, the temperature information securing component, the moisture information securing component and the ess-strain information
Securing component forms a detection unit；It is set in the sample container, from the cold end window direction room temperature end window mouth
It is equipped with mounting rod, the detection unit is set on the mounting rod.
Beneficial effects of the present invention are as follows:
The present invention provides a kind of frost heave experimental provisions, which includes sample container, the sample container
On offer cold end window and room temperature end window mouth, cold end end cap, Yu Suoshu room temperature end window are provided on Yu Suoshu cold end window
It is provided with room temperature end end cap on mouthful, ground sample is filled in sample container.The frost heave experimental provision further includes refrigeration system,
The refrigeration system includes for providing the freezing unit of cooling capacity, and the freezing unit includes cooling capacity discharge conduit, described
Cooling capacity discharge conduit is set on the cold end end cap, for the release of cooling capacity, is released by the one end of refrigeration system to ground sample
The amount of letting cool, to realize ground frost heave.The frost heave experimental provision further includes freezing front migration detection system, the freezing front
Migrating detection system includes power supply, and the power supply includes positive terminal and negative pole end, the positive terminal and the cathode
End is divided on the cold end end cap and room temperature end end cap, for the cold end window and the room temperature end window mouth
The ground sample at place loads positive electrode current and cathodal current, is in series with ammeter with the power supply, is parallel with voltmeter.Pass through
The measurement of length, room temperature ground density, Frozen Rock and Soil density, current value and voltage value is loaded to ground, so that it may pass through jelly
Migration detection system in knot sharp side measures the length of Frozen Rock and Soil, to obtain the transfer parameter of freezing front.By upper
Structure design is stated, the present invention can simulate the freezing heave behavior of soil body during frozen construction, i.e. simulation freezing process
Frost-heaving force variation tendency in middle freezing process obtains the water translocation parameter in freezing process in soil layer, to frozen construction
Caused freezing heave behavior carries out comprehensive and systematic research in engineering, and the further genralrlization use for artificially layer freezing process provides ginseng
Examine foundation.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.Wherein:
Fig. 1 is the equivalent circuit diagram of freezing front migration detection system when carrying out frost heave experiment；
Fig. 2 is the structural schematic diagram of frost heave experimental provision in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of mounting rod in the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of sample container in the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of cold end end cap in the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of room temperature end end cap in the embodiment of the present invention；
Description of symbols:
Sample container 1, room temperature end end cap 3, freezing unit 4, cooling capacity discharge conduit 5, inlet 5a, goes out liquid at cold end end cap 2
Mouth 5b, power supply 6, ammeter 7, voltmeter 8, water pump 9, data collection and analysis instrument 10, detection unit 11, mounting rod 12, normal-temperature water
Pipe 13, outlet end 13b, feed liquor main pipe 14, goes out liquid main pipe 15 at input end 13a.
Specific embodiment
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.The explanation of each example through the invention
Mode, which provides, to be not intended to limit the present invention.In fact, those skilled in the art will be clear that, the scope of the present invention or essence are not being departed from
In the case where mind, it can modify in the present invention and modification.For example, being illustrated or described as the spy of a part of one embodiment
Sign can be used for another embodiment, to generate another embodiment.Thus, it may be desirable to which the present invention includes to be included into appended power
Such modifications and variations in the range of benefit requirement and its equivalent.
In the description of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the present invention rather than require the present invention that must be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.Term used in the present invention " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected,
It may be a detachable connection；It can be directly connected, can also be indirectly connected by intermediate member, for the common of this field
For technical staff, the concrete meaning of above-mentioned term can be understood as the case may be.
Fig. 1 is please referred to Fig. 6, wherein Fig. 1 is the equivalent circuit of freezing front migration detection system when carrying out frost heave experiment
Figure；Fig. 2 is the structural schematic diagram of frost heave experimental provision in the embodiment of the present invention；Fig. 3 is the knot of mounting rod in the embodiment of the present invention
Structure schematic diagram；Fig. 4 is the structural schematic diagram of sample container in the embodiment of the present invention；Fig. 5 is cold end end cap in the embodiment of the present invention
Structural schematic diagram；Fig. 6 is the structural schematic diagram of room temperature end end cap in the embodiment of the present invention.
In order to solve the problems in the existing technology, the present invention provides a kind of frost heaves for considering water translocation to test dress
It sets, quantitatively characterizing moisture field, temperature field, stress field, the variation tendency of strain and cutting edge of a knife or a sword can be freezed during manual pipe jacking
The migration in face, and then quantitative research is carried out to freezing heave behavior.
For this purpose, freezing to test for realizing ground the present invention provides a kind of frost heave experimental provision.
In the present invention, which includes the sample container 1 for loading ground sample.Sample container 1 by
Metal material is made, preferably steel.The vertical section of sample container 1 is regular shape, such as circle, ellipse, rectangle, just more
Side shape etc..Also, for sample container 1 using tubular structure, such as cylindrical shape, oval cylinder etc., such ground sample is loaded in examination
In sample container 1, when being compacted to ground sample, it is ensured that ground sample compactness is more consistent.
Cold end window is offered on sample container 1 and room temperature end window mouth, cold end window are oppositely arranged with room temperature end window mouth,
When sample container 1 is tubular structure, cold end window and room temperature end window mouth set up separately at the both ends of sample container 1.The present invention exists
It is provided with cold end end cap 2 on cold end window, room temperature end end cap 3 is provided on Yu Changwen end window mouth, by cold end end cap 2 to cold end window
Mouth is closed, and is closed by room temperature end end cap 3 to room temperature end window mouth.
In the present invention, cold end end cap 2 can be tightened on cold end window by the way of being threadedly coupled, and can also be used
Inserting mode fastens on cold end window；Room temperature end end cap 3 is tightened on room temperature end window mouth in a manner of using being threadedly coupled,
It can be fastened on room temperature end window mouth using inserting mode.Cold end end cap 2 and room temperature end end cap 3 are made of metal material, tool
Body, cold end end cap 2 and room temperature end end cap 3 are made of No. 45 steel.
Ground is loaded in sample container 1, in freezing experiment, needs to obtain the character parameter of ground, therefore,
Multiple sensors are additionally provided in sample container 1, the signal that sensor obtains is exported by survey line cable, so, the present invention is trying
The lead wire outlet passed through for survey line cable is offered on sample container 1, in a preferred embodiment of the present invention, two lead wire outlet
It is arranged respectively close to cold end window and room temperature end window mouth.
In the present invention, which includes for realizing its freezing freezed to ground sample released cold quantity
System.
Specifically, refrigeration system includes for providing the freezing unit 4 of cooling capacity, and freezing unit 4 is by compressor, evaporation
The equipment such as device, condenser are constituted, and are carried out heat exchange by evaporator and are exported low temperature refrigerant medium, wherein coolant media is that CaCl2 is molten
Liquid and/or alcohol, preferably alcohol.
Freezing unit 4 includes cooling capacity discharge conduit 5, and cooling capacity discharge conduit 5 is set on cold end end cap 2, for cooling capacity
Release.Wherein, cooling capacity discharge conduit 5 uses metal tube, preferably copper pipe or copper alloy tube, and cooling capacity discharge conduit 5 uses
On cold end end cap 2, the inlet 5a of cooling capacity discharge conduit 5 stretches out helical coiled tube structure setting from the outer rim of cold end end cap 2,
The liquid outlet 5b of cooling capacity discharge conduit 5 is stretched out from the position close to 2 central point of cold end end cap.Cooling capacity discharge conduit 5 and evaporator
Heat exchange is carried out, the coolant media to circulate in cooling capacity discharge conduit 5 can absorb cooling capacity, then cooling capacity can be discharged into ground examination
In sample.
The refrigerator of freezing unit 4 is connected by feed liquor main pipe 14 with the inlet 5a of cooling capacity discharge conduit 5, cooling capacity release
The liquid outlet 5b of pipeline 5 is connect with refrigerator again by going out liquid main pipe 15；So that refrigerant is out of refrigerator via feed liquor
Main pipe 14, inlet 5a, cooling capacity discharge conduit 5, liquid outlet 5b and liquid main pipe 15 out, then flow back into refrigerator, form one
Circulation.
In the present invention, which includes the room temperature system for position ground room temperature in the temperature remains within the normal range end window mouth
System.Wherein, noncryogenic system includes the water pump 9 for exporting room temperature water flow, is connected with normal temperature water pipe with the water outlet of water pump 9
13, normal temperature water pipe 13 is set on room temperature end end cap 3, for providing normal temperature environment for ground sample.Wherein, normal temperature water pipe 13 is adopted
With metal tube, preferably copper pipe or copper alloy tube, normal temperature water pipe 13 is using helical coiled tube structure setting in room temperature end end cap 3
On, the input end 13a of normal temperature water pipe 13 is stretched out from the outer rim of room temperature end end cap 3, and the outlet end 13b of normal temperature water pipe 13 is from close to often
The position of warm 3 central point of end end cap is stretched out.The water energy to circulate in normal temperature water pipe 13 is enough and ground sample carries out heat exchange and in turn will
The temperature of ground sample is maintained room temperature.
Wherein, water pump 9 is preferably variable frequency pump, higher for the flow control accuracy of room temperature water flow.
Freeze in operation in actual ground, ground by level off to constant temperature state centered on cooling capacity discharge conduit 5 by
Gradually start to freeze, in order to enable ground sample is more nearly nature, the present invention is provided with noncryogenic system, is mentioned by noncryogenic system
Semen donors or heat make it be more nearly nature to change ground specimen temperature.
In the present invention, which includes migrating detection system for detecting the freezing front of freezing front migration
System.
Specifically, freezing front migration detection system includes power supply 6, and power supply 6 includes positive terminal and negative pole end, just
Extreme and negative pole end is divided on cold end end cap 2 and room temperature end end cap 3, is used for cold end window and room temperature end window mouth
Ground sample load positive electrode current and cathodal current, be in series with ammeter 7 with power supply 6, be parallel with voltmeter 8.
For some region of ground, ingredient, character are consistent substantially, therefore, in its natural state, this
The ground density p of ground in region2It is believed that it is consistent, in the frozen state, the ground density p of the ground in this region1?
Think consistent, ρ1≠ρ2。
After selecting a certain region, from Ohm's law:
U=I (R1+R2)
Above-mentioned formula is more specifically expressed are as follows:
It is known
Therefore
It derives
In above-mentioned formula, U, I can be measured by voltmeter 8 and ammeter 7, ρ1、ρ2For ground density (its
Approximately constant), S, that is, ground sample filling length, U, I, ρ1、ρ2And S is known parameters, passes through above-mentioned equation, it will be able to
11 length variation is calculated, 11 length variation just represents the migration of freezing front.
Specifically, positive terminal is provided with positive gasket, and positive gasket is set on cold end end cap 2 or room temperature end end cap 3；It is negative
It extremely is provided with cathode gasket, cathode gasket is set on room temperature end end cap 3 or cold end end cap 2；Power supply 6 is DC power supply.On
The positive gasket and cathode gasket stated are iron gasket, are arranged in the inside of end cap (cold end end cap 2, room temperature end end cap 3)
On face.
During simulating frost heave, due to water translocation, the density of cause the to endure cold soil body and non-frozen soil body is variant, by
Above-mentioned rule is as can be seen that the length 11 for the soil body of enduring cold and the ratio of voltage and current are in a linear relationship, by voltage, electric current number
According to record and processing can measure the length of the soil body 11 of enduring cold, the place of this namely freezing front.Carrying out frost heave experiment
During, recording voltmeter, ammeter data handle experimental data.
In the present invention, which includes that comprehensive parameters obtain system, and comprehensive parameters obtain system and include
Data collection and analysis instrument 10.
It includes temperature monitoring subsystem, stress monitoring subsystem, moisture monitoring subsystem, strain that comprehensive parameters, which obtain system,
Monitoring subsystem.The present invention select TDS630 data collecting instrument carry out temperature, stress, strain acquirement, using moisture Acquisition Instrument into
The acquisition of row moisture information.
Specifically, temperature monitoring subsystem includes the temperature information acquisition group for obtaining ground specimen temperature information
Part, temperature information securing component connect with 10 signal of data collection and analysis instrument and are set in sample container 1.
Specifically, moisture monitoring subsystem includes the moisture information acquisition group for obtaining ground sample moisture information
Part, moisture information securing component connect with 10 signal of data collection and analysis instrument and are set in sample container 1.
Specifically, stress monitoring subsystem includes the stress information acquisition group for obtaining ground sample stress information
Part, stress information securing component connect with 10 signal of data collection and analysis instrument and are set in sample container 1.
Specifically, strain monitoring subsystem includes for obtaining ground sample (in freezing process) ess-strain information
Strain information securing component, strain information securing component connect with 10 signal of data collection and analysis instrument and are set to sample container 1
It is interior.
Temperature information securing component includes temperature data acquisition instrument and constantan-copper thermocouple string, temperature data acquisition instrument and heat
Galvanic couple string is connected by survey line, and constantan-copper thermocouple string is wound on mounting rod 12, tests the soil body for measuring in sample container 1
Internal temperature.
Moisture information securing component includes moisture transducer and moisture data Acquisition Instrument, and moisture data Acquisition Instrument and moisture pass
Sensor is connected by survey line, and moisture transducer is mounted on mounting rod 12, the moisture content for inside soil body in measuring device.
Stress information securing component includes stress data acquisition instrument and stress meter, and stress data acquisition instrument and stress measure member
Part is connected by survey line, and stress measuring element is mounted on mounting rod 12, the stress for inside soil body in measuring device；
Strain information securing component includes foil gauge and strain data Acquisition Instrument, and strain data Acquisition Instrument and foil gauge pass through
Survey line connection, foil gauge is mounted on mounting rod 12, for obtaining the strain information of ground sample (in freezing process).
Mounting means of the above-mentioned each sensor on mounting rod 12 is as follows: mounting rod 12 lies in a horizontal plane in sample container 1
Interior, cold end end cap 2 and room temperature end end cap 3 are stretched out in the both ends of mounting rod 12 respectively.A survey line is arranged on mounting rod 12, is surveyed
Line is located on the lateral central axes of sample container 1, and five measuring points, the cloth on each measuring point is arranged in the length direction along mounting rod 12
One group of detection unit 11 is set, four sensors (thermocouple, moisture transducer, the stress measuring element being arranged in detection unit 11
And foil gauge) around the equally circumferentially spaced of mounting rod 12.When mounting rod 12 is rectangular parallelepiped structure, four sensors are set respectively
On 4 sides of cuboid (except both ends of the surface).
For the measurement of freezing front migration, the present invention is provided with iron gasket, external power supply 6, voltmeter 8, ammeter 7,
Wherein, iron gasket setting there are two and fixed on the medial surface of two end caps respectively, by conducting wire by external electricity on two iron gaskets
Source 6, ammeter 7 are concatenated, and shunt voltage table 8 constitutes a closed circuit；Freeze for testing water translocation in freezing process
Tie the position on sharp side.
The material of sample container 1, cold end end cap 2, room temperature end end cap 3 and mounting rod 12 in experimental provision is both preferably
45#Steel.
Experimental method is as follows:
(1) experimental provision assembles, and by temperature, moisture, stress, strain testing laying element will install on mounting rod 12
Bar 12 is put into sample container 1, will be wrapped in the survey line on mounting rod 12 by the lead wire outlet of 1 two sides of sample container and be drawn survey
Line, the center that mounting rod 12 passes through both ends end cap reserve round mouth, screw the screw thread on the end cap of one end, consolidated mounting rod 12 with bolt
It lives calmly, bankets into sample container 1, constantly vibrated during banketing to guarantee that soil layer is closely knit, screwed on other end end cap
Screw thread, blending bolt is fixed by end cap and mounting rod 12, then installs refrigeration system and noncryogenic system；
The refrigerator of refrigeration system is connected by feed liquor main pipe 14 with the inlet 5a on cold end end cap 2, and refrigerant is by going out
Liquid mouth 5b flows back to refrigerator by going out liquid main pipe 15, and normal temperature water pipe 13 is connected by water pipe with variable frequency pump 9, and water is by water tank
Variable frequency pump 9 is successively by water inlet pipe, input end 13a, normal temperature water pipe 13, outlet end 13b outlet pipe and then reflow tank；
(2) experimental provision is debugged, and starts refrigeration system, sets the temperature freezed, and opens other end water pump 9, is set constant
Flow；
(3) frost heave is simulated, in the whole process, (acquires situation tune depending on experimental data at interval of certain data acquisition time
It is whole) carry out a data acquisition；
(4) experimental provision is removed, Data Processing in Experiment is carried out.
Technical solution bring provided by the invention has the beneficial effect that: can be to the jelly of soil body during frozen construction
Swollen effect is simulated, i.e. frost-heaving force variation tendency in simulation freezing process in freezing process；Obtain soil in freezing process
Water translocation parameter in layer.Comprehensive and systematic research is carried out to freezing heave behavior caused in frozen construction engineering, for artificially
The further genralrlization of layer freezing process uses offer reference frame.
The above is only a preferred embodiment of the present invention, is not intended to restrict the invention, and comes for those skilled in the art
It says, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any modification, equivalent
Replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of frost heave experimental provision characterized by comprising
For loading the sample container (1) of ground sample, cold end window and room temperature end window mouth are offered on the sample container,
The cold end window is oppositely arranged with the room temperature end window mouth, and cold end end cap (2), Yu Suoshu are provided on Yu Suoshu cold end window
Room temperature end end cap (3) is provided on room temperature end window mouth；
Refrigeration system, the refrigeration system include for providing the freezing unit (4) of cooling capacity, and the freezing unit includes cold
It measures discharge conduit (5), the cooling capacity discharge conduit is set on the cold end end cap, for the release of cooling capacity；
Freezing front migrates detection system, and the freezing front migration detection system includes power supply (6), and the power supply includes
Positive terminal and negative pole end, the positive terminal and the negative pole end are divided into the cold end end cap and room temperature end end cap
Above, for loading positive electrode current and cathodal current to the ground sample at the cold end window and the room temperature end window mouth,
Ammeter (7) is in series with the power supply, is parallel with voltmeter (8).
2. frost heave experimental provision according to claim 1, which is characterized in that
The positive terminal is provided with positive gasket, and the anode gasket is set to the cold end end cap or room temperature end end cap
On；
The negative pole end is provided with cathode gasket, and the cathode gasket is set to room temperature end end cap or the cold end end cap
On.
3. frost heave experimental provision according to claim 1, which is characterized in that
The power supply is DC power supply.
4. frost heave experimental provision according to claim 1, which is characterized in that
It further include having noncryogenic system；
The noncryogenic system includes to be connected with room temperature with the water outlet of the water pump for exporting the water pump of room temperature water flow (9)
Water pipe, the normal temperature water pipe are set on the end cap of the room temperature end.
5. frost heave experimental provision according to claim 4, which is characterized in that
The sample container is the tubular structure that cross section is regular shape.
6. frost heave experimental provision according to claim 5, which is characterized in that
The cooling capacity discharge conduit is helical coiled tube structure setting on the medial surface of the cold end end cap；
The normal temperature water pipe is helical coiled tube structure setting on the medial surface of room temperature end end cap.
7. frost heave experimental provision according to any one of claims 1 to 6, which is characterized in that
It further include thering are comprehensive parameters to obtain system, it includes data collection and analysis instrument (10) that the comprehensive parameters, which obtain system,；
It further includes the temperature information securing component having for obtaining ground specimen temperature information, institute that the comprehensive parameters, which obtain system,
Temperature information securing component is stated to connect and be set in the sample container with the data collection and analysis instrument signal.
8. frost heave experimental provision according to claim 7, which is characterized in that
It further includes the moisture information securing component having for obtaining ground sample moisture information, institute that the comprehensive parameters, which obtain system,
Moisture information securing component is stated to connect and be set in the sample container with the data collection and analysis instrument signal.
9. frost heave experimental provision according to claim 8, which is characterized in that
It further includes having the ess-strain information for obtaining ground sample ess-strain information to obtain that the comprehensive parameters, which obtain system,
Component is taken, the ess-strain information acquisition component connect with the data collection and analysis instrument signal and is set to the sample
In container.
10. frost heave experimental provision according to claim 9, which is characterized in that
The temperature information securing component, the moisture information securing component and ess-strain information acquisition component composition
One detection unit (11)；
In in the sample container, be directed toward the room temperature end window mouth from the cold end window and be provided with mounting rod (12), the inspection
Unit is surveyed to be set on the mounting rod.
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| CN201910490231.8A CN110108748B (en) | 2019-06-05 | 2019-06-05 | Frost heaving experimental device |
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| CN201910490231.8A CN110108748B (en) | 2019-06-05 | 2019-06-05 | Frost heaving experimental device |
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| CN110108748B (en) | 2021-09-10 |
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