CN108375603A - A kind of the hydro-thermal characteristic joint test method and system of simulation soil body Frozen-thawed cycled - Google Patents
A kind of the hydro-thermal characteristic joint test method and system of simulation soil body Frozen-thawed cycled Download PDFInfo
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Abstract
The present invention relates to soil strength variation testing fields, and in particular to a kind of the hydro-thermal characteristic joint test method and system of simulation soil body Frozen-thawed cycled, the hydro-thermal characteristic joint test method include the following steps：The soil body is packed into a container, is prepared into test sample；Test sample is connected into TDR, KD2 and T2 detector, and the test sample connected is put into the insulating box of sealing state；The cryogenic temperature of insulating box is set, obtain test sample from room temperature reach cryogenic temperature during freezing data, and freeze the first preset time under cryogenic temperature；Obtain thawing data of the test sample in natural melting process；Off-test.Relationship between dynamic reflection soil body freeze thawing time of the present invention, temperature, moisture content and the coefficient of heat conduction realizes multiple physical field coupling analysis, probes into the hydro-thermal characteristic rule and engineering properties of the soil body more scientificly.
Description
Technical field
The present invention relates to soil strength variation testing fields, and in particular to a kind of hydro-thermal characteristic joint of simulation soil body Frozen-thawed cycled
Test method and system.
Background technology
Frozen soil refers to soil and rock containing ice inclusion enclave, is the special soils aqueous systems containing ice crystal.Frozen soils temperature is usual
At 0 DEG C hereinafter, being very typical multiphase multi-size granular materials.
During the unfreezing of soil, the distribution and variation of moisture content can cause soil thermal characteristic parameter and molten
Variation of the matter on space-time, to influence the distribution of soil heat flow and temperature；On the other hand, the variation of temperature and solute will draw
The variation for playing water physics, chemical property influences moisture fortune so as to cause the variation of soil water property and matric potential
It is dynamic, while temperature gradient itself can also cause the movement of moisture.During soil freezing, the moisture glaciation of freezing zone,
In ice, water coexisting state, soil water and heat quantity is made to change, the dynamic equilibrium of native water system is destroyed, and moisture is in soil
Water potential gradient effect is lower, and constantly never freezing zone is migrated to freezing zone.As a result, in freezing zone, the content of ice is continuously increased,
Cause body frost heaving.With gradual warming up for weather, soil melts since surface layer, and frozen crust below hinders upper layer to melt
It is oozed under water, upper layer of soil moisture content is caused to increase, phenomena such as spring flood frost boiling occur.In frozen-thaw process, the water of soil, hot situation
Violent variation has occurred.
Hydro-thermal changing rule in research freeze-thawing process of soil is of great significance for studying the engineering properties of frozen soil, but
Current not systematic indoor and outdoor tests method studies the hydro-thermal characteristic of the soil body.Therefore, a kind of simulation soil body freeze thawing is designed
Cycle, and can be always again indoors ability in the soil mass water thermal characteristics joint test method and system of outdoor progress
One of the problem of field technique personnel's primary study.
Invention content
The technical problem to be solved in the present invention is, for the drawbacks described above of the prior art, provides a kind of simulation soil body jelly
The hydro-thermal characteristic joint test method for melting cycle solves the problems, such as the hydro-thermal changing rule in research freeze-thawing process of soil.
The technical problem to be solved in the present invention is, for the drawbacks described above of the prior art, provides a kind of simulation soil body jelly
The hydro-thermal characteristic test system for melting cycle solves the problems, such as the hydro-thermal changing rule in research freeze-thawing process of soil.
The technical problem to be solved in the present invention is, for the drawbacks described above of the prior art, provides a kind of simulation soil body jelly
Melt the hydro-thermal characteristic joint test method of cycle, which is characterized in that the hydro-thermal characteristic joint test method includes the following steps：
The soil body is packed into a container, is prepared into test sample；
Test sample is connected into TDR, KD2 and T2 detector, and the test sample connected is put into the perseverance of sealing state
Incubator, wherein TDR detectors are used to detect the moisture content of test sample, and KD2 detectors are used to detect the heat transfer of test sample
Coefficient, T2 detectors are used to detect the temperature of test sample；
The cryogenic temperature of insulating box is set, obtain test sample from room temperature reach cryogenic temperature during freezing data,
And freeze the first preset time under cryogenic temperature；
Obtain thawing data of the test sample in natural melting process；
Off-test.
Wherein, preferred version is that the hydro-thermal characteristic joint test method is further comprising the steps of：
Before testing, test sample is filled to water-saturated state, and keeps water-saturated state second default in vacuum environment
Time.
Wherein, preferred version is that the hydro-thermal characteristic joint test method is further comprising the steps of：
During test sample reaches cryogenic temperature from room temperature, and opened when the temperature of test sample is down to preset temperature
Beginning periodically acquires freezing data, until the temperature of test sample reaches cryogenic temperature；
Start to periodically acquire thawing data in test sample nature melting process, until off-test；
Wherein, the freezing data and moisture content and the coefficient of heat conduction that thawing data are test sample.
Wherein, preferred version is that the hydro-thermal characteristic joint test method is further comprising the steps of：
Before testing, the original moisture content of test sample is obtained；
Test sample is in natural melting process, when the moisture content of acquisition is consistent with original moisture content, off-test.
Wherein, preferred version is that the cryogenic temperature of the insulating box is set as -15 DEG C to -30 DEG C.
Wherein, it is to obtain primary freezing data at interval of four minutes that preferred version, which is the freezing data that periodically acquire,；
Described periodically acquire melts data to obtain primary thawing data at interval of four minutes.
Wherein, preferred version is that the hydro-thermal characteristic joint test method is further comprising the steps of：
According to the temperature of the test sample of record, temperature time-domain curve figure is drawn；
According to the moisture content, the coefficient of heat conduction and temperature of the test sample of record, graph of relation is drawn.
Wherein, preferred version is that the hydro-thermal characteristic joint test method is further comprising the steps of：
According to the temperature time-domain curve figure and graph of relation of drafting, hydro-thermal specificity analysis is carried out to test sample.
The present invention also provides a kind of hydro-thermal characteristic test system of simulation soil body Frozen-thawed cycled, hydro-thermal characteristic test systems
It includes a container to unite, TDR, KD2 and T2 detector, insulating box, which is separately connected container, wherein
Container is placed with the soil body inside the container；
TDR detectors, the TDR detectors are used to detect the moisture content of the soil body；
KD2 detectors, the KD2 detectors are used to detect the coefficient of heat conduction of the soil body；
T2 detectors, the T2 detectors are used to detect the temperature of the soil body；
Insulating box, the insulating box maintain the temperature of setting, and provide sealed environment, are internally provided with container.
Wherein, it further includes vacuum air pump that preferred version, which is the hydro-thermal characteristic test system, which provides
Vacuum environment.
The beneficial effects of the present invention are compared with prior art, the present invention is followed by a kind of simulation soil body freeze thawing of design
It is the hydro-thermal characteristic joint test method and system of ring, the test method and system dynamic reflection soil body freeze thawing time, temperature, aqueous
Relationship between rate and the coefficient of heat conduction realizes multiple physical field coupling analysis, can probe into the hydro-thermal characteristic of the soil body more scientificly
Rule and engineering properties, to instructing the engineering construction of Frozen Ground Area to be of great significance；Also, the test method and system
It can not be limited again by place in outdoor progress indoors, convenient for the progress of test.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 to Fig. 5 is the flow diagram of hydro-thermal characteristic joint test method of the present invention；
Fig. 6 is the schematic diagram of hydro-thermal characteristic test system of the present invention；
Fig. 7 is temperature time-domain curve figure of the present invention；
Fig. 8 is graph of relation of the present invention.
Specific implementation mode
In conjunction with attached drawing, elaborate to presently preferred embodiments of the present invention.
As shown in Figures 1 to 5, the present invention provides a kind of hydro-thermal characteristic joint test method of simulation soil Frozen-thawed cycled
Preferred embodiment.
Specifically, with reference to figure 1, a kind of hydro-thermal characteristic joint test method of simulation soil body Frozen-thawed cycled, the hydro-thermal spy
Property joint test method includes the following steps：
The soil body is packed into a container by step 100, is prepared into test sample；
Wherein, which is diameter 8cm, the cylinder of high 15cm.
Test sample is connected TDR, KD2 and T2 detector, and the test sample connected is put into sealing by step 300
The insulating box of state；
Wherein, the probe of TDR, KD2 and T2 detector is inserted into test sample, is used in combination preservative film by test sample and spy
Needle is put into the insulating box of sealing state after being fully sealed；TDR detectors are used to detect the moisture content of test sample, KD2 detectors
The coefficient of heat conduction for detecting test sample, T2 detectors are used to detect the temperature of test sample；
Step 400, be arranged insulating box cryogenic temperature, obtain test sample from room temperature reach cryogenic temperature during it is cold
Freeze data, and freezes the first preset time under cryogenic temperature；
Wherein, the cryogenic temperature that insulating box is arranged is -20 DEG C, during test sample reaches -20 DEG C from room temperature, is obtained
Freezing data are taken, and after test sample reaches cryogenic temperature, keeps 24 hours abundant freeze-off times.
Step 500 obtains thawing data of the test sample in natural melting process；
Wherein, after test sample terminates the second preset time, the power supply of insulating box is closed, control test sample is in constant temperature
Melt naturally under the sealing state of case, and obtains the thawing data of test sample；
Step 900, off-test.
Further, and with reference to figure 2, the hydro-thermal characteristic joint test method is further comprising the steps of：
Step 200, before testing, is filled to water-saturated state, and water-saturated state is kept in vacuum environment by test sample
Second preset time.
Wherein, second preset time is 12 hours, and the test sample is keeping the second preset time of water-saturated state,
It is sealed with preservative film when taking-up.
Further, and with reference to figure 3, the hydro-thermal characteristic joint test method is further comprising the steps of：
Step 410, the cryogenic temperature that insulating box is arranged are -20 DEG C；
Step 420, during test sample reaches cryogenic temperature from room temperature, and be down in the temperature of test sample default
Start to periodically acquire freezing data when temperature；
Step 430, until the temperature of test sample reaches cryogenic temperature, stop obtaining freezing data；
Step 440 freezes the first preset time under cryogenic temperature；
Step 450 starts to periodically acquire thawing data in test sample nature melting process, until off-test.
Wherein, the freezing data and moisture content and the coefficient of heat conduction that thawing data are test sample.
In the present embodiment, and with reference to figure 4, the hydro-thermal characteristic joint test method is further comprising the steps of：
Test sample is connected TDR, KD2 and T2 detector, and the test sample connected is put into sealing by step 300
The insulating box of state；
Step 310, before testing, obtains the original moisture content of test sample；
Step 400, be arranged insulating box cryogenic temperature, obtain test sample from room temperature reach cryogenic temperature during it is cold
Freeze data, and freezes the first preset time under cryogenic temperature；
Step 500 obtains thawing data of the test sample in natural melting process；
Step 910, test sample are in natural melting process, when the moisture content of acquisition is consistent with original moisture content, examination
Test end.
In the present embodiment, the cryogenic temperature of the insulating box is set as -15 DEG C to -30 DEG C；It is described periodically acquire it is cold
It is to obtain primary freezing data at interval of four minutes to freeze data.
Specifically, and with reference to figure 5, the hydro-thermal characteristic joint test method is further comprising the steps of：
Step 600, the temperature according to the test sample of record, draw temperature time-domain curve figure；
Step 700, moisture content, the coefficient of heat conduction and temperature according to the test sample of record, draw graph of relation；
Step 800, temperature time-domain curve figure and graph of relation according to drafting, multiple physical field coupling to test sample into
Row hydro-thermal specificity analysis.
As shown in Figure 7 and Figure 8, the present embodiment provides the temperature time-domain curve figures drawn by experimental data and aqueous
The graph of relation of rate, the coefficient of heat conduction and temperature, and carry out hydro-thermal specificity analysis.
With reference to figure 7, two groups of experimental datas at different temperatures are provided, since the temperature of insulating box and the temperature of soil sample exist
Freezing process incipient stage difference is bigger, and the temperature difference close to 40 DEG C, freeze starting stage soil sample temperature and decline comparatively fast by cause.It is dropping to
After 0 DEG C or less, the decline of soil sample temperature slows down, and the duration is longer.This process is when gradually being frozen due to a large amount of film water,
It is influenced caused by discharging latent heat, and due to the good seal of insulating box and suitable sampling time in melting process so that
Rise curve smoothing.
In freezing process, at 0 DEG C or so, there are a plateau, this stage soil sample temperature is kept the temperature of soil sample
It is fluctuated at 0 DEG C or so.It is considered that within this stage, release latent heat makes soil sample and outer when a large amount of film water gradually freeze in soil
The heat exchange of boundary's freezing chamber is in equilibrium state, and soil sample temperature maintains 0 DEG C of this long period in stage, 2 hours about nearly.
The Frozen-thawed cycled temperature time-domain curve of soil sample and asymmetry in Fig. 7, are because of reduction of speed at a temperature of freezing process
Degree is faster than the rate of rise in temperature of melting process.There is also the plateau that temperature is stable at 0 DEG C, times equally in melting process
It is roughly equal with freezing process.In temperature elevation process, since the continuous thawing of film water-ice crystalline substance is absorbed heat, on temperature is curved
It rises, until whole frozen soil melt, temperature just enters positive value.
With reference to figure 8, curve 3 is moisture content, and curve 4 is the coefficient of heat conduction, and there are one in freezing process for the temperature of soil sample
A plateau, this stage soil sample temperature are maintained at 0 DEG C or so, and moisture content is gradually reduced, and the rate of decline is obviously accelerated than before；
With the reduction of temperature, the coefficient of heat conduction of frozen soil increases rapidly, and the coefficient of heat conduction is apparent with water-cut variation.
In soil sample melting process, the coefficient of heat conduction is once mutated at 0 DEG C or so, is reduced later, hereafter soil sample is aqueous
The change rate of rate can also significantly increase；But on the contrary, after the coefficient of heat conduction mutation of soil sample, water-cut variation rate drops freezing process
It is low.
For soil body freezing and thawing characteristic curves there are hysteresis, freezing process is similar to dehydration, and melting process, which is similar to, inhales
Water process, although liquid water content is identical, since residing process is different, corresponding soil water potential is also different, therefore is frozen
Junction temperature or melt temperature are also different.After complete melt, soil sample water content cannot be completely recovered to the level before experiment,
Melt in water absorption course, the water absorption of soil is horizontal before since the reduction of soil water potential is unable to reach, and leads to hysteresis.
In the present embodiment, the hydro-thermal characteristic joint test method can with the dynamic reflection soil body freeze thawing time, temperature, contain
Relationship between water rate and the coefficient of heat conduction realizes multiple physical field coupling analysis, and the hydro-thermal that can probe into the soil body more scientificly is special
Property rule and engineering properties, to instructing the engineering construction of Frozen Ground Area to be of great significance；Also, the test method and system are
It can not can be limited again by place in outdoor progress indoors, convenient for the progress of test.
As shown in fig. 6, the present invention also provides a kind of preferable realities of the hydro-thermal characteristic test system of simulation soil body Frozen-thawed cycled
Apply example.
Specifically, a kind of hydro-thermal characteristic test system of simulation soil body Frozen-thawed cycled, the hydro-thermal characteristic test system packet
Include a container 10, TDR detectors 20, KD2 detectors 30 and T2 detectors 40, insulating box 50, the TDR detectors 20, KD2 detections
Instrument 30 and T2 detectors 40 are separately connected container 10, wherein
Container 10 is placed with the soil body inside the container 10；
TDR detectors 20, the TDR detectors 20 are used to detect the moisture content of the soil body；
KD2 detectors 30, the KD2 detectors 30 are used to detect the coefficient of heat conduction of the soil body；
T2 detectors 40, the T2 detectors 40 are used to detect the temperature of the soil body；
Insulating box 50, the insulating box 50 maintain the temperature of setting, and provide sealed environment, are internally provided with container 10.
Further, the hydro-thermal characteristic test system further includes vacuum air pump, which provides vacuum ring
Border.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
Any modification made all within the spirits and principles of the present invention, equivalent replacement, improve etc., it should be included in the guarantor of the present invention
It protects in range.
Claims (10)
1. a kind of hydro-thermal characteristic joint test method of simulation soil body Frozen-thawed cycled, which is characterized in that the hydro-thermal characteristic joint
Test method includes the following steps：
The soil body is packed into a container, is prepared into test sample；
Test sample is connected into TDR, KD2 and T2 detector, and the test sample connected is put into the insulating box of sealing state,
Wherein, TDR detectors are used to detect the moisture content of test sample, and KD2 detectors are used to detect the coefficient of heat conduction of test sample,
T2 detectors are used to detect the temperature of test sample；
The cryogenic temperature of insulating box is set, obtain test sample from room temperature reach cryogenic temperature during freezing data, and
Freeze the first preset time under cryogenic temperature；
Obtain thawing data of the test sample in natural melting process；
Off-test.
2. hydro-thermal characteristic joint test method according to claim 1, which is characterized in that the hydro-thermal characteristic joint test
Method is further comprising the steps of：
Before testing, test sample is filled to water-saturated state, and keeps the second preset time of water-saturated state in vacuum environment.
3. hydro-thermal characteristic joint test method according to claim 1 or 2, which is characterized in that the hydro-thermal characteristic joint
Test method is further comprising the steps of：
During test sample reaches cryogenic temperature from room temperature, and start week when the temperature of test sample is down to preset temperature
Phase property obtains freezing data, until the temperature of test sample reaches cryogenic temperature；
Start to periodically acquire thawing data in test sample nature melting process, until off-test；
Wherein, the freezing data and moisture content and the coefficient of heat conduction that thawing data are test sample.
4. hydro-thermal characteristic joint test method according to claim 2, it is characterised in that：The hydro-thermal characteristic joint test
Method is further comprising the steps of：
Before testing, the original moisture content of test sample is obtained；
Test sample is in natural melting process, when the moisture content of acquisition is consistent with original moisture content, off-test.
5. hydro-thermal characteristic joint test method according to claim 3, it is characterised in that：The cryogenic temperature of the insulating box
It is set as -15 DEG C to -30 DEG C.
6. hydro-thermal characteristic joint test method according to claim 3, it is characterised in that：It is described to periodically acquire freezing number
Data are once freezed according to be obtained at interval of four minutes；Described periodically acquire melts data to be obtained once at interval of four minutes
Melt data.
7. hydro-thermal characteristic joint test method according to claim 1, which is characterized in that the hydro-thermal characteristic joint test
Method is further comprising the steps of：
According to the temperature of the test sample of record, temperature time-domain curve figure is drawn；
According to the moisture content, the coefficient of heat conduction and temperature of the test sample of record, graph of relation is drawn.
8. hydro-thermal characteristic joint test method according to claim 7, which is characterized in that the hydro-thermal characteristic joint test
Method is further comprising the steps of：
According to the temperature time-domain curve figure and graph of relation of drafting, hydro-thermal specificity analysis is carried out to test sample.
9. a kind of hydro-thermal characteristic test system of simulation soil body Frozen-thawed cycled, it is characterised in that：The hydro-thermal characteristic test system
Including a container, TDR, KD2 and T2 detector, insulating box, which is separately connected container, wherein
Container is placed with the soil body inside the container；
TDR detectors, the TDR detectors are used to detect the moisture content of the soil body；
KD2 detectors, the KD2 detectors are used to detect the coefficient of heat conduction of the soil body；
T2 detectors, the T2 detectors are used to detect the temperature of the soil body；
Insulating box, the insulating box maintain the temperature of setting, and provide sealed environment, are internally provided with container.
10. hydro-thermal characteristic test system according to claim 9, it is characterised in that：The hydro-thermal characteristic test system is also
Including vacuum air pump, which provides vacuum environment.
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