CN110514690A - A kind of test soil sample solidification point cooling device - Google Patents
A kind of test soil sample solidification point cooling device Download PDFInfo
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- CN110514690A CN110514690A CN201910875471.XA CN201910875471A CN110514690A CN 110514690 A CN110514690 A CN 110514690A CN 201910875471 A CN201910875471 A CN 201910875471A CN 110514690 A CN110514690 A CN 110514690A
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- 239000002689 soil Substances 0.000 title claims abstract description 126
- 238000007711 solidification Methods 0.000 title claims abstract description 52
- 230000008023 solidification Effects 0.000 title claims abstract description 52
- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 238000001816 cooling Methods 0.000 title claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 62
- 238000000926 separation method Methods 0.000 claims abstract description 17
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 14
- 239000004816 latex Substances 0.000 claims description 8
- 229920000126 latex Polymers 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
- 238000002474 experimental method Methods 0.000 abstract description 8
- 239000011148 porous material Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 230000007704 transition Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 239000004927 clay Substances 0.000 description 4
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000004781 supercooling Methods 0.000 description 2
- 238000004861 thermometry Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- 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
- G01N25/14—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation
-
- 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
- G01N25/14—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation
- G01N25/145—Accessories, e.g. cooling devices
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a kind of test soil sample solidification point cooling devices, are related to soil sample solidification point experimental technique field.The present invention includes including cold storehouse, vertical baffle is provided among the inner cavity bottom end in the cold storehouse, the bottom inner portion of vertical baffle is symmetrically arranged with liquid separation through-hole, the top of the connectivity part of two liquid separation through-holes is pointed cone structure, the bottom end of vertical baffle is provided with connector, the bottom end of connector is provided with into cryostat liquid pipe, the inner cavity bottom end in cold storehouse is symmetrically arranged with soil sample about vertical baffle, temperature sensor is inserted in soil sample, temperature sensor is plugged in the center of soil sample, the top in cold storehouse is provided with out cryostat liquid pipe, and the top in cold storehouse is hinged with warehouse lid.The present invention reduces the temperature inside the box by cryostat liquid inside cold storehouse, to reach cooling effect, and the cooling of soil sample is relatively uniform, stablize, help to capture pore water when undergoing phase transition, the latent heat of release causes this phenomenon of temperature jump, to obtain the solidification point of soil.
Description
Technical field
The invention belongs to soil sample solidification point experimental technique fields, and specifically, in particular to a kind of test soil sample is freezed
Temperature cooling device.
Background technique
The solidification point of soil is the maximum temperature that native pore water freezes or starting solidification point.Solidification point it is big
It is small not only to be influenced by numerous internal factors such as soil particle size, mineral composition, water content, also by the work of ambient pressure
With.Thus solidification point is the reflection soil body under the effect of various composite factors, when temperature is reduced to subzero, if having
The comprehensive judgement index that pore ice is formed is the important criterion for distinguishing frozen soil and non-frozen soil.Engineering in practice, solidification point is again
It is the important parameter for determining the depth of freezing and thaw depth of soil.Therefore, how to measure the size of solidification point is understanding frozen soil
The premise of physical property is the basis using frozen soil, improvement frozen soil.
Though having several kinds to the measuring method of native solidification point at present, since thermometry is low-cost, easy to operate etc.
Advantage, indoors solidification point test in be used widely.When so-called thermometry is namely based on Tu Zhongshui and undergoes phase transition, it will
Latent heat is discharged, this principle of temperature jump is caused, by the monitoring to temperature during cooling soil body, captures jump in temperature
Highest, the most stable of temperature occurred in soil afterwards, the method to obtain native starting solidification point.Therefore, no matter in laboratory
Research or engineering in practice, need that a nested structure is simple and convenient to operate, pressure-bearing is higher, the higher measurement high-pressure soil of accuracy
The test device of solidification point, to further investigate the freezing process of deep soil.
But it is filled at present in the test device of soil sample solidification point without a kind of extensive experiment acceptable to all
It sets, usually oneself designs easy device, the experiment to device to the numerous researchers in the field during studying solidification point
Effect etc. does not compare；There are also some self-designed devices, and device is divided into upper layer and lower layer by partition and compares experiment,
But this device, when being filled with cryostat liquid in device, the time of two layers of contact cryostat liquid can be different, and then are unfavorable for comparing；
Therefore the present invention mainly invents a kind of experimental provision for surveying soil sample solidification point, is used extensively by researcher.
For the problems in the relevant technologies, currently no effective solution has been proposed.
Summary of the invention
For the problems in the relevant technologies, the present invention proposes a kind of test soil sample solidification point cooling device, existing to overcome
There is above-mentioned technical problem present in the relevant technologies.
In order to solve the above technical problems, the present invention is achieved by the following technical solutions:
The present invention is a kind of test soil sample solidification point cooling device, including cold storehouse, among the inner cavity bottom end in the cold storehouse
It is provided with vertical baffle, the bottom inner portion of the vertical baffle is symmetrically arranged with liquid separation through-hole, the company of two liquid separation through-holes
The top at logical place is pointed cone structure, and the bottom end of the vertical baffle is provided with connector, the bottom end of the connector be provided with into
The inner cavity bottom end of cryostat liquid pipe, the cold storehouse is symmetrically arranged with soil sample about the vertical baffle, is inserted in the soil sample
Temperature sensor, the temperature sensor are plugged in the center of the soil sample, and the top in the cold storehouse is provided with out cryostat liquid
Pipe, the top in the cold storehouse is hinged with warehouse lid.
Further, the warehouse lid bottom end and be located at the cold storehouse on the inside of be provided with sealing ring, the bottom end of the warehouse lid
Side and be located at the cold storehouse bulkhead above be provided with resilient rubbber cushion, the bottom end of the resilient rubbber cushion is provided with magnetite
One, the top of the warehouse lid is provided with handle close to the side of the resilient rubbber cushion.
Further, the top in the cold storehouse is provided with the recess to match with the resilient rubbber cushion, in the recess
It is provided with the magnetite two attracted with one phase of magnetite.
Further, the end of the temperature sensor is provided with conducting wire, and the side in the cold storehouse is provided with sealing hole,
The conducting wire is through the sealing hole and extends to outside it, and the middle part side in cold storehouse is provided with support plate, the support plate
Top is provided with data acquisition device, and the conducting wire is connect with the data acquisition device.
Further, the connector is located in the bottom end bulkhead in the cold storehouse, the connectivity part of two liquid separation through-holes
Positioned at the surface of the connector, and it is located at the center of the connector, i.e., the described pointed cone structure is located at the connection
Center above mouthful.
Further, in the bottom end bulkhead that the cold storehouse is located at into cryostat liquid pipe, and described run through into cryostat liquid pipe
The cold storehouse simultaneously extends to outside it.
Further, the outer side seal of the soil sample is packaged with latex film.
The invention has the following advantages:
The following table 1 and table 2 list soil sample basic physical parameters and ion concentration respectively.According to Unified Soil Classification System, soil
Sample HC-1, HC-2, CS-1 and CS-2 belong to inductile fine clay (CL).The total salt content of four groups of soil samples is between 2%-36%.
HC-1 and HC-2 respectively indicates the salt marsh of two groups of chloride contents high (>=15%), sulphates content low (≤0.5%)
Soil, and CS-1 and CS-2 respectively indicate two groups of amounts containing villaumite lower (≤5%) but the relatively high salinized soil of sulphates content.
Four groups of soil samples are all unsaturated soils, and saturation degree is in 60-95%.
The physical characteristic parameter of 1 salinized soil of table
The content of different salinities in 2 salinized soil of table
According to Chinese Highway engineering specification (JTG E40-2007), under room temperature, under optimum moisture content state, by 4
Group soil sample is densified to 96% relative compaction, and sample is compacted again with the cutting ring of internal diameter 61.8mm high 20mm, carries out body change respectively
Direct shear test in test and temperature-fall period.In an experiment, the solidification point using cooling device test soil sample of the invention is (cold
But schematic device is as shown below), pedotheque is put into before cooling chamber by soil sample having a size of diameter 40mm, height 90mm
It is sealed with latex film.Temperature sensor is connect by conducting wire with data acquisition device.Cryostat liquid in cold storehouse passes through equipment bottom
The cryostat liquid pipe that goes out into cryostat liquid pipe and top in portion is recycled in equipment.In addition, carrying out temperature using walk-in type cryogenic thermostat room
Degree adjusts and test, and walk-in type cryogenic thermostat room carries out thermostatic control by the cooling equipment of computer inner ventilation, and temperature change can
To be maintained at down in ± 0.5 DEG C of -22 DEG C of set temperature.The soil sample of preparation is sealed with latex film, then in pre-selection
At least 24 hour are placed in cryostat under test temperature so that equalized temperature.Test temperature is spaced from 20 DEG C to -20 DEG C
10℃。
Each portion of CS-1 and CS-2 soil sample is taken respectively, and according to (JTG E40-2007), salt marsh is determined by cool-down method
The solidification point of soil, detailed process is as follows:
1) soil sample is sealed in a cold storehouse, is initially set at 2 DEG C；2) after reaching thermal balance, cryostat temperature is adjusted to -20
DEG C, in temperature-fall period, the temperature data of soil sample is per second to be collected 1 time；3) when soil sample reaches target temperature, experiment is completed.It will
CS-1 target temperature is set in -20 DEG C, is temperature when considering original position soil temperature in winter, and its for the pre- of high salinity
Phase solidification point calculated value.Due to the soil sample CS-2 compared with low saline salinity, expected solidification point is set as -10 DEG C.As Fig. 5 reflects
In temperature-fall period, soil temperature changes with time the soil body.Soil can be clearly seen that by the temperature lowering curve of CS-2 soil sample
Body opening gap water is cooling and the different phase freezed: in 0-1.75h, pore water supercooling；In 1.75h-3.5h, Free water is frozen
Knot；After 3.5h, the combination water that freezes or do not freeze moisture film around soil particle.Determine CS-2 solidification point be-
It is 2.66 DEG C, higher than the solidification point of prediction by about 3%.However, the temperature drop curve of soil sample CS-1 is not when temperature reaches -20.5 DEG C
Show any freeze or the sign of latent heat treatment, it can be seen that its solidification point is lower than -20 DEG C, consistent with prediction.Table 3 is total
Four groups of soil sample predictions and actual measurement solidification point are tied.In fact, examine the field investigation of lattice highway statistics indicate that, soil body salt
Content is generally 10%, it means that most of salinized soil of this route will not all freeze in winter.
The prediction and test of 3 pedotheque solidification point of table
| Soil grouping | It tests solidification point (DEG C) | It predicts solidification point (DEG C) |
| HC-1 | — | -170.99 |
| HC-2 | — | -108.41 |
| CS-1 | <-20.5 | -23.34 |
| CS-2 | -2.66 | -2.75 |
Through the above technical solutions, 1, by cryostat liquid inside cold storehouse reduce the temperature inside the box, to reach cooling effect,
And since cryostat liquid all around soil sample wraps up, the cooling of soil sample is relatively uniform, stablizes, helps to capture hole
When water is undergone phase transition, the latent heat of release causes this phenomenon of temperature jump, to obtain the solidification point of soil；2 by perpendicular
It is used cooperatively to partition, liquid separation through-hole, pointed cone structure, cryostat liquid stream can averagely be distributed to two liquid separations and led to by pointed cone structure
In hole, the problem of efficiently solving the time difference that comparison soil sample is contacted with cryostat liquid, be unfavorable for comparison；3, by magnetite one,
Magnetite two, resilient rubbber cushion are used cooperatively, so that warehouse lid and cold storehouse closely sealed more consolidation, are more advantageous to the control of empirical factor
System；4, present apparatus structure be simple and convenient to operate, strong applicability.
Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of inventive embodiments, embodiment will be described below required attached
Figure is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments invented, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is perspective view of the invention；
Fig. 2 is structural schematic diagram of the invention；
Fig. 3 is schematic enlarged-scale view at A of the invention；
Fig. 4 is schematic enlarged-scale view at B of the invention；
Fig. 5 is the curve graph that soil temperature changes with time.
In attached drawing, parts list represented by the reference numerals are as follows:
1, Leng Cang；101, sealing hole；102, support plate；103, data acquisition device；104, recess；105, magnetite two；2,
Vertical baffle；3, liquid separation through-hole；4, pointed cone structure；5, connector；6, into cryostat liquid pipe；7, soil sample；8, temperature sensor；801,
Conducting wire；9, go out cryostat liquid pipe；10, warehouse lid；1001, sealing ring；1002, resilient rubbber cushion；1003, magnetite one；1004, handle.
Specific embodiment
Below in conjunction with the attached drawing in inventive embodiments, the technical solution in inventive embodiments is carried out clearly and completely
Description, it is clear that described embodiment is only invention a part of the embodiment, instead of all the embodiments.Based in invention
Embodiment, all other embodiment obtained by those of ordinary skill in the art without making creative efforts,
Belong to the range of invention protection.
In the description of the present invention, it is to be understood that, term " aperture ", "upper", "lower", "top", " in ", "inner", " four
Indicating positions or the positional relationships such as week " be merely for convenience of description invention and simplify description, rather than indication or suggestion is signified
Component or element must have a particular orientation, and be constructed and operated in a specific orientation, therefore should not be understood as the limit to invention
System.
It please refers to shown in Fig. 1-5, the present invention is a kind of test soil sample solidification point cooling device, including cold storehouse 1 is described cold
Vertical baffle 2 is provided among the inner cavity bottom end in storehouse 1, the bottom inner portion of the vertical baffle 2 is symmetrically arranged with liquid separation through-hole 3,
The top of the connectivity part of two liquid separation through-holes 3 is pointed cone structure 4, and the bottom end of the vertical baffle 2 is provided with connector 5,
The bottom end of the connector 5 is provided with into cryostat liquid pipe 6, and the inner cavity bottom end in the cold storehouse 1 is symmetrically set about the vertical baffle 2
It is equipped with soil sample 7, temperature sensor 8 is inserted in the soil sample 7, the temperature sensor 8 is plugged in the center of the soil sample 7
The heart, the top in the cold storehouse 1 are provided with out cryostat liquid pipe 9, and the top in the cold storehouse 1 is hinged with warehouse lid 10.
In one embodiment, for above-mentioned warehouse lid 10,10 bottom end of warehouse lid and the inside for being located at the cold storehouse 1
It is provided with sealing ring 1001, the bottom end side of the warehouse lid 10 and is located above the bulkhead in the cold storehouse 1 and is provided with elastic rubber
Pad 1002, the bottom end of the resilient rubbber cushion 1002 are provided with magnetite 1, and the top of the warehouse lid 10 is close to the elasticity
The side of rubber pad 1002 is provided with handle 1004, to pass through the setting of sealing ring 1001, so that the sealing at warehouse lid 10 is imitated
Fruit is more preferable so that temperature scatter and disappear more slowly；Attracted by the cooperation of magnetite 1 and magnetite 2 105, so that warehouse lid
10 with the closely sealed more consolidation in cold storehouse 1, be more advantageous to the control of empirical factor.
In one embodiment, for above-mentioned cold storehouse 1, the top in the cold storehouse 1 is provided with and the elastic rubber
The recess 104 that pad 1002 matches is provided with the magnetite 2 105 attracted with one 1003 phase of magnetite in the recess 104, from
And when covering warehouse lid 10, resilient rubbber cushion 1002 and magnetite 1 in warehouse lid 10 inject in recess 104, at this time magnetite one
1003 want to attract with magnetite 2 105, and resilient rubbber cushion 1002 is elongated so that warehouse lid 10 with cold storehouse 1 is closely sealed more steps up
It is close, it is more advantageous to the control of empirical factor.
In one embodiment, for above-mentioned temperature sensor 8, the end of the temperature sensor 8 is provided with
Conducting wire 801, the side in the cold storehouse 1 are provided with sealing hole 101, and the conducting wire 801 is through the sealing hole 101 and extends to it
Outside, the middle part side in cold storehouse 1 are provided with support plate 102, and the top of the support plate 102 is provided with data acquisition device 103,
The conducting wire 801 is connect with the data acquisition device 103, to pass through the setting of sealing hole 101, can be prevented in cold storehouse 1
Cryostat liquid flowed out from conducting wire 801, temperature sensor 8 is connect by conducting wire 801 with data acquisition device 103, and then real-time
Measure the temperature in soil sample 7.
In one embodiment, for above-mentioned connector 5, the connector 5 is located at the bottom end bulkhead in the cold storehouse 1
Interior, the connectivity part of two liquid separation through-holes 3 is located at the surface of the connector 5, and is located at the centre bit of the connector 5
It sets, i.e., the described pointed cone structure 4 is located at the center of 5 top of connector, to hit when cryostat liquid enters from connector 5
It hits in pointed cone structure 4, since pointed cone structure 4 is located at center, and then cryostat liquid stream can be averagely distributed to two by pointed cone structure 4
In a liquid separation through-hole 3, the time difference that comparison soil sample is contacted with cryostat liquid is efficiently solved, comparison problem is unfavorable for.
In one embodiment, described to be located at the cold storehouse 1 into cryostat liquid pipe 6 for above-mentioned into for cryostat liquid pipe 6
In the bulkhead of bottom end, and it is described into cryostat liquid pipe 6 through the cold storehouse 1 and extending to outside it, thus by logical into cryostat liquid pipe 6
Enter cryostat liquid, and then the cryostat liquid in cold storehouse 1 is followed by the cryostat liquid pipe 9 that goes out into cryostat liquid pipe 6 and top of device bottom
For ring into equipment, cold 1 inside cryostat liquid of storehouse reduces temperature in storehouse, to reach cooling effect, and since 7 surrounding of soil sample is whole
For cryostat liquid package, therefore, the cooling of soil sample 7 is relatively uniform, stablizes, and helps to capture pore water release when undergoing phase transition
Latent heat cause this phenomenon of temperature jump, thus obtain soil solidification point.
In one embodiment, for above-mentioned soil sample 7, the outer side seal of the soil sample 7 is packaged with latex film, thus
Soil sample 7 is wrapped by latex film.
In conclusion the following table 1 and table 2 list the basic physics of soil sample respectively by means of above-mentioned technical proposal of the invention
Parameter and ion concentration.According to Unified Soil Classification System, soil sample HC-1, HC-2, CS-1 and CS-2 belong to inductile fine clay
(CL).The total salt content of four groups of soil samples is between 2%-36%.
HC-1 and HC-2 respectively indicates the salt marsh of two groups of chloride contents high (>=15%), sulphates content low (≤0.5%)
Soil, and CS-1 and CS-2 respectively indicate two groups of amounts containing villaumite lower (≤5%) but the relatively high salinized soil of sulphates content.
Four groups of soil samples are all unsaturated soils, and saturation degree is in 60-95%.
The physical characteristic parameter of 1 salinized soil of table
The content of different salinities in 2 salinized soil of table
According to Chinese Highway engineering specification (JTG E40-2007), under room temperature, under optimum moisture content state, by 4
Group soil sample is densified to 96% relative compaction, and sample is compacted again with the cutting ring of internal diameter 61.8mm high 20mm, carries out body change respectively
Direct shear test in test and temperature-fall period.In an experiment, the solidification point using cooling device test soil sample of the invention is (cold
But schematic device is as shown below), pedotheque is put into before cooling chamber by soil sample 7 having a size of diameter 40mm, height 90mm
It is sealed with latex film.Temperature sensor 8 is connect by conducting wire 801 with data acquisition device 103.Cryostat liquid in cold storehouse 1 is logical
The cryostat liquid pipe 9 that goes out into cryostat liquid pipe 6 and top for crossing device bottom is recycled in equipment.In addition, permanent using walk-in type low temperature
Greenhouse carries out temperature adjusting and test, and walk-in type cryogenic thermostat room carries out thermostatic control by the cooling equipment of computer inner ventilation,
Temperature change may remain in down in ± 0.5 DEG C of -22 DEG C of set temperature.The soil sample 7 of preparation is sealed with latex film, so
At least 24 hours are placed in cryostat under the test temperature of pre-selection afterwards so that equalized temperature.Test temperature is from 20 DEG C
10 DEG C are spaced to -20 DEG C.
Each portion of CS-1 and CS-2 soil sample is taken respectively, and according to (JTG E40-2007), salt marsh is determined by cool-down method
The solidification point of soil, detailed process is as follows:
1) soil sample 7 is sealed in a cold storehouse, is initially set at 2 DEG C；2) after reaching thermal balance, cryostat temperature is adjusted to-
20 DEG C, in temperature-fall period, the temperature data of soil sample 7 is per second to be collected 1 time；3) it when soil sample 7 reaches target temperature, has tested
At.CS-1 target temperature is set in -20 DEG C, is temperature when considering original position soil temperature in winter, and its for high saliferous
The expection solidification point calculated value of amount.Due to the soil sample CS-2 compared with low saline salinity, expected solidification point is set as -10 DEG C.Such as
Fig. 5 reflects the soil body in temperature-fall period, and soil temperature changes with time.It can be clear by the temperature lowering curve of CS-2 soil sample
See the different phase that soil body pore water is cooling and freezes: in 0-1.75h, pore water supercooling；In 1.75h-3.5h, Free water
Freeze；After 3.5h, the combination water that freezes or do not freeze moisture film around soil particle.Determine the solidification point of CS-2
It is -2.66 DEG C, it is higher than the solidification point of prediction by about 3%.However, the temperature drop curve of soil sample CS-1 is simultaneously when temperature reaches -20.5 DEG C
Any freeze or the sign of latent heat treatment is not shown, it can be seen that its solidification point is lower than -20 DEG C, consistent with prediction.Table 3
Summarize four groups of soil sample predictions and actual measurement solidification point.In fact, examine the field investigation of lattice highway statistics indicate that, soil body salt
Content be generally 10%, it means that most of salinized soil of this route will not all freeze in winter.
The prediction and test of 3 pedotheque solidification point of table
Through the above technical solutions, 1, by cold 1 inside cryostat liquid of storehouse reduce the temperature inside the box, to reach cooling effect
Fruit, and since cryostat liquid all around soil sample 7 wraps up, the cooling of soil sample 7 is relatively uniform, stablizes, helps to capture
When pore water is undergone phase transition, the latent heat of release causes this phenomenon of temperature jump, to obtain the solidification point of soil；2 is logical
It crosses vertical baffle 2, liquid separation through-hole 3, pointed cone structure 4 to be used cooperatively, cryostat liquid stream can averagely be distributed to two by pointed cone structure 4
In a liquid separation through-hole 3, the problem of efficiently solving the time difference that comparison soil sample is contacted with cryostat liquid, be unfavorable for comparison；3, lead to
Magnetite 1, magnetite 2 105, resilient rubbber cushion 1002 is crossed to be used cooperatively so that warehouse lid 10 with cold storehouse 1 is closely sealed more steps up
It is real, it is more advantageous to the control of empirical factor；4, present apparatus structure be simple and convenient to operate, strong applicability.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
Particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one embodiment of invention
Or in example.In the present specification, schematic expression of the above terms may not refer to the same embodiment or example.And
And particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples with suitable
Mode combine.
Invention disclosed above preferred embodiment is only intended to help to illustrate invention.There is no detailed descriptionthes for preferred embodiment
All details, do not limit the invention to the specific embodiments described.Obviously, according to the content of this specification, can make
Many modifications and variations.These embodiments are chosen and specifically described to this specification, is the principle in order to preferably explain invention
And practical application, so that skilled artisan be enable to better understand and utilize invention.Invention is only by claim
The limitation of book and its full scope and equivalent.
Claims (7)
1. a kind of test soil sample solidification point cooling device, including cold storehouse (1), it is characterised in that: the interior bottom of chamber of the cold storehouse (1)
End is intermediate to be provided with vertical baffle (2), and the bottom inner portion of the vertical baffle (2) is symmetrically arranged with liquid separation through-hole (3), two institutes
The top for stating the connectivity part of liquid separation through-hole (3) is pointed cone structure (4), and the bottom end of the vertical baffle (2) is provided with connector
(5), the bottom end of the connector (5) is provided with into cryostat liquid pipe (6), and the inner cavity bottom end of the cold storehouse (1) is about described vertical
Partition (2) is symmetrically arranged with soil sample (7), is inserted with temperature sensor (8) in the soil sample (7), the temperature sensor (8)
It is plugged in the center of the soil sample (7), the top of the cold storehouse (1) is provided with out cryostat liquid pipe (9), the cold storehouse (1)
Top is hinged with warehouse lid (10).
2. a kind of test soil sample solidification point cooling device according to claim 1, which is characterized in that the warehouse lid (10)
Bottom end and be located at the cold storehouse (1) on the inside of be provided with sealing ring (1001), the bottom end side of the warehouse lid (10) and be located at institute
It states and is provided with resilient rubbber cushion (1002) above the bulkhead in cold storehouse (1), the bottom end of the resilient rubbber cushion (1002) is provided with magnetic
The top of stone one (1003), the warehouse lid (10) is provided with handle (1004) close to the side of the resilient rubbber cushion (1002).
3. a kind of test soil sample solidification point cooling device according to claim 2, which is characterized in that the cold storehouse (1)
Top be provided with the recess (104) to match with the resilient rubbber cushion (1002), be provided in the recess (104) and institute
State the magnetite two (105) that magnetite one (1003) mutually attracts.
4. a kind of test soil sample solidification point cooling device according to claim 1, which is characterized in that the temperature sensing
The end of device (8) is provided with conducting wire (801), and the side of the cold storehouse (1) is provided with sealing hole (101), the conducting wire (801)
It through the sealing hole (101) and extends to outside it, the middle part side of cold storehouse (1) is provided with support plate (102), the support
The top of plate (102) is provided with data acquisition device (103), and the conducting wire (801) and the data acquisition device (103) are even
It connects.
5. a kind of test soil sample solidification point cooling device according to claim 1, which is characterized in that the connector
(5) in the bottom end bulkhead of the cold storehouse (1), the connectivity part of two liquid separation through-holes (3) is located at the connector (5)
Surface, and be located at the center of the connector (5), i.e., the described pointed cone structure (4) is located above the connector (5)
Center.
6. a kind of test soil sample solidification point cooling device according to claim 1, which is characterized in that described into cryostat liquid
Pipe (6) is located in the bottom end bulkhead of the cold storehouse (1), and it is described run through into cryostat liquid pipe (6) the cold storehouse (1) and extend to it
It is external.
7. a kind of test soil sample solidification point cooling device according to claim 1, which is characterized in that the soil sample (7)
Outer side seal be packaged with latex film.
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