CN105092578B - Moisture transition process follow-up mechanism and its experimental method in a kind of frozen soil - Google Patents
Moisture transition process follow-up mechanism and its experimental method in a kind of frozen soil Download PDFInfo
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- CN105092578B CN105092578B CN201510299172.8A CN201510299172A CN105092578B CN 105092578 B CN105092578 B CN 105092578B CN 201510299172 A CN201510299172 A CN 201510299172A CN 105092578 B CN105092578 B CN 105092578B
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Abstract
The invention discloses moisture transition process follow-up mechanism and its experimental method in a kind of frozen soil, device includes soil sample groove, upper cryostat plate and lower cryostat groove, soil sample groove is made up of lucite wide plate, lucite narrow boards and lower cryostat plate, lower cryostat plate can connect external geneva water bottle simulated groundwater supply, upper cryostat plate is provided with the inlet and outlet of freezing liquid, and lower cryostat groove is made up of lucite board slot, copper tube serpentine.The compound of fluorescer, water and soil is filled in soil sample groove by this method first, then soil sample groove is placed in lower cryostat groove, upper cryostat plate is placed in the top of the soil body, lower cryostat plate connects geneva water bottle, the upper cryostat plate and lower cryostat groove for using the outside heat sink of connection carry out unidirectional cooling for the soil body, ultraviolet light and digital camera are opened during experiment, follows the trail of the water translocation process in Freezing Soils.The present invention is simple in construction, easy to operate, can intuitively observe the water translocation process in frozen soil.
Description
Technical field
The present invention relates to moisture transition process follow-up mechanism and its experimental method in a kind of frozen soil, the indoor geotechnological low temperature examination of category
Test technical field.
Background technology
Frozen soil, as a kind of Subgrade soil in engineering, it is distributed widely in the areas such as China northeast, North China, northwest.With
The engineering construction such as the fast development of China's economy, the railway of Frozen Ground Area, road, water conservancy, pipeline vigorously promotes, and permafrost region is native
Body moisture in freezing process crystallizes into the frost heave that ice causes soil particle displacement and formed, and melting of being thus derived it is sunken,
Rise soil, the disease such as lifting by frost, be all the problem for perplexing the engineering constructions such as permafrost region railway, road all the time, be also domestic
The focal issue of outer frozen soil scholar research.
Domestic and international researcher is it is believed that the frost heave of the soil body is made up of frost heave in situ and fractional condensation frost heave, and segregates frost heave
It is the fundamental component of body frost heaving.Fractional condensation frost heave be by water translocation in frozen soil and in the soil body certain position generation segregated ice and
Caused, what the driving force of wherein water translocation came from thermograde induction does not freeze water potential gradient.As can be seen here, frozen soil is studied
In water translocation process, the forming process of the forming process of ice crystal and freezing front, to disclose Frost heave of frozen soil breed evolution,
Disaster mechanism, propose that effective freezing prevention measure has highly important practical meaning in engineering.However, experimental facilities, experiment
Technology, the scarcity of means are all that Moisture Transfer Rule research is difficult to deep bottleneck in frozen soil all the time；It is general at present both at home and abroad
All over using the Moisture Transfer Rule in two ways research Freezing Soils, freeze front and rear difference first, being tested using oven drying method
The method of height and position water content of soil, this method are only capable of obtaining the water content distribution state before and after freezing soil, can not be to water
Transition process is divided to be analyzed；Second, using the change of native cylinder water content in moisture transducer test freezing process, this method
Though can be monitored to water translocation process, visuality is a lack of, while the test of water content is also mostly volumetric(al) moisture content.
Therefore there is an urgent need to it is a kind of can be easily to moisture transition process is tracked in frozen soil method.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of strong frozen soil reclaimed water simple in construction, easy to operate, visual
Divide transition process follow-up mechanism and its experimental method.
In order to solve the above technical problems, apparatus of the present invention are adopted the technical scheme that：Water translocation in a kind of frozen soil
Journey follow-up mechanism, its key technology are：It includes soil sample groove, upper cryostat plate and lower cryostat groove；
The soil sample groove includes two lucite wide plates, the lucite of parallel and symmetrical setting that parallel and symmetrical is set
Narrow boards and lower cryostat plate, the lucite wide plate are vertically arranged with machine glass narrow boards, the lucite wide plate and machine glass
Glass narrow boards encloses the sample groove that cross section is rectangle, and the bottom of the sample groove is lower cryostat plate；The lucite wide plate with
Machine glass narrow boards is located by connecting through fixing bolt；The lucite wide plate is provided with several temperature gaging holes；
Be provided with moisturizing passage on the lower cryostat plate, the moisturizing passage by connection water supplement port and exhaust outlet main channel
With the subchannel composition of connection soil sample bottom, the main channel connects with subchannel；
The upper cryostat plate includes a rectangular tube, and the rectangular tube is provided with freezing liquid import and freezing liquid exports；
The lower cryostat groove includes poly (methyl methacrylate) plate groove and is arranged at the copper tube serpentine of poly (methyl methacrylate) plate trench bottom, described to have
The freezing liquid entrance point and the freezing liquid port of export of machine glass board slot are extended to outside machine glass board slot；
The soil sample groove is inside lower cryostat groove, and the upper cryostat plate is located at the top of the soil body in sample groove.
Preferably, the lucite wide plate, lucite narrow boards and lower cryostat plate are spelled by fluid sealant and fixing bolt
Dress is integrated.
Preferably, the light transmittance of the lucite wide plate is at least 95%.
Preferably, the upper cryostat plate, lower cryostat plate are stainless steel.
Preferably, the inside clear height of the lower cryostat groove is identical with the clear height of lower cryostat plate.
Preferably, the water supplement port and exhaust outlet at the top of lower cryostat plate with flushing.
This experimental method is：The compound of fluorescer, water and soil is filled in soil sample groove first, from the temperature in soil sample groove
Gaging hole insertion temperature sensor is spent, then soil sample groove is placed in lower cryostat groove, the soil body that upper cryostat plate is placed in soil sample groove
Top, connection water supplement port is to geneva water bottle, after water is full of in moisturizing passage, closes exhaust outlet, then outer using connection
The upper cryostat plate of portion's heat sink and lower cryostat groove are that the soil body carries out unidirectional cooling, and ultraviolet light sum code-phase is opened during experiment
Machine, follow the trail of the water translocation process in Freezing Soils.
It is further to improve, need to carry out 12h constant temperature processing before carrying out unidirectional cooling for the soil body, treat that native body temperature is consistent
When, then start the water supplement port that cools and open.
In the above method, in Freezing Soils, the temperature of upper cryostat plate is subzero temperature, and the temperature of lower cryostat groove is+1 °
C, it is top-down simulated field soil body.It is pure water and the mixture of fluorescer, the fluorescence in the geneva water bottle
The volume of agent is every liter of water 5g.
It is using beneficial effect caused by above-mentioned technical proposal：
1st, the present invention is provided with soil sample groove, upper cryostat plate and lower cryostat groove, and its overall structure is simple, cost is low, operation
It is convenient, visual it is strong, automation is strong, using effect is good, intuitively can observe and analyze water translocation process in frozen soil, ice crystal
And the forming process of freezing front, the recharge of ground water is qualitatively analyzed to frozen soil disease Emergence and Development mechanism.
2nd, due to that can be that the soil body in soil sample groove is carried out unidirectionally there is provided upper cryostat plate, lower cryostat plate and lower cryostat groove
（From top to bottom）Cooling, simulate the simulated field soil body of the live soil body；It is because lower cryostat plate can connect external geneva water bottle
Soil sample moisturizing, simulate the recharge of ground water effect in live Freezing Soils；Because soil sample groove is using the organic of high transmission rate
Glass wide plate, can be using moisture transition process in Freezing Soils in digital camera shooting soil sample groove during experiment；Due to
Freeze the characteristic of front and rear display different colours using the fluorescer under ultraviolet light, can more intuitively observe ice crystal in the soil body
Forming process, and combination temperature sensor, the formation of real-time monitored freezing front, moving process；Due to the soil in experimentation
It is computer control that temperature change, water replenishment, digital camera, which are taken pictures, has automaticity high, workable
Feature, reduce artificial disturbance.
Brief description of the drawings
Fig. 1 is the structural representation of soil sample groove of the present invention；
The A-A that Fig. 2 is Fig. 1 cuts open schematic diagram；
Fig. 3 is the schematic top plan view of this soil sample groove；
Fig. 4 is the structural representation of upper cryostat plate；
The C-C that Fig. 5 is Fig. 4 cuts open schematic diagram；
Fig. 6 is the structural representation of lower cryostat groove；
Fig. 7 is Fig. 6 schematic top plan view；
Wherein, 1, lucite wide plate, 1-1, temperature gaging hole；2nd, lucite narrow boards；3rd, lower cryostat plate, 3-1, moisturizing
Passage, 3-2, water supplement port, 3-3, exhaust outlet；4th, fixing bolt；5th, upper cryostat plate, 5-1, rectangular tube, 5-2, freezing liquid import, 5-
3rd, freezing liquid exports；6th, lower cryostat groove, 6-1, lucite board slot, 6-2, copper tube serpentine, 6-3, freezing liquid entrance point are 6-4, cold
Freeze the liquid port of export；7th, sample groove.
Embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
The present apparatus includes soil sample groove, upper cryostat plate 5 and lower cryostat groove 6.The soil sample groove is located inside lower cryostat groove 6,
The upper cryostat plate 5 is located at the top of the soil body in soil sample groove.
As shown in accompanying drawing 1- accompanying drawings 3, the soil sample groove includes two pieces of lucite wide plates 1 and two pieces of lucite narrow boards 2
And lower cryostat plate 3, two pieces of parallel and symmetricals of lucite wide plate 1, two pieces of lucite narrow boards 2 are similarly parallel and symmetrical and set
Put, the lucite wide plate 1 is vertically arranged with machine glass narrow boards 2, and the lucite wide plate 1 encloses with machine glass narrow boards 2
Into the sample groove 7 that cross section is rectangle, the bottom of the sample groove 7 is provided with lower cryostat plate 3；It is the lucite wide plate 1, organic
Glass narrow boards 2 and lower cryostat plate 3 are integrated by fluid sealant and the assembly of fixing bolt 4.If the lucite wide plate 2 is provided with
Dry temperature gaging hole 1-1.Moisturizing passage 3-1 is provided with the lower cryostat plate 3, the moisturizing passage 3-1 is by connection water supplement port
3-2 and exhaust outlet 3-3 main channel and the subchannel composition of connection soil sample bottom, the main channel connect and hung down with subchannel
It is straight to set.The light transmittance of the lucite wide plate 2 need to reach 95%.
As shown in figures 4 and 5, the upper cryostat plate 5 is included on stainless steel rectangular pipe a 5-1, the rectangular tube 5-1
Provided with freezing liquid import 5-2 and freezing liquid outlet 5-3.The upper cryostat plate 5, lower cryostat plate 3 are stainless steel plate.
As shown in accompanying drawing 6 and accompanying drawing 7, the lower cryostat groove 6 includes poly (methyl methacrylate) plate groove 6-1 and is arranged at poly (methyl methacrylate) plate
The copper tube serpentine 6-2, the lucite board slot 6-1 of groove 6-1 bottoms freezing liquid entrance point 6-3 and freezing liquid port of export 6-4
Extend to outside lucite board slot 6-1；The lucite board slot 6-1 is rectangular channel.The inside clear height of the lower cryostat groove 6
It is identical with the clear height of lower cryostat plate 3.The water supplement port 3-2 and exhaust outlet 3-3 flush with the lower top of cryostat plate 3.
Illustrate the experimentation of the present invention below by two embodiments.
Embodiment 1
Moisture transition process tracking implementation process is in frozen soil under closing not supplying water condition：
The content of native reclaimed water is obtained according to water content and dry ground quality, is incorporated into fluorescer according to every liter of water 5g proportioning
In soil, and fencing lawn diel.The compound conserved is filled in soil sample groove, temperature is inserted after filling to setting position
Sensor, then soil sample groove is placed in lower cryostat groove 6, upper cryostat plate 5 is placed at the top of the soil body, by the freezing on lower cryostat groove 6
Liquid entrance point 6-3 and freezing liquid port of export 6-4 and freezing liquid import 5-2 and freezing liquid outlet 5-3 difference on upper cryostat plate 5
Externally connected heat sink.The water supplement port 3-2 and exhaust outlet 3-3 of lower cryostat plate 3 are closed, and it is anti-by being full of in lower cryostat groove 6
Freeze liquid, open outside heat sink and set to same temperature（+1°C）, start to carry out constant temperature to the soil body.Treat inside soil body temperature
When degree reaches consistent, adjustment connects the outside heat sink of upper cryostat plate 5 to a certain subzero temperature, connects lower the outside of cryostat groove 6 and drops
Warm unit temp is constant, and opens ultraviolet light and digital camera, follows the trail of water translocation process, ice crystal shape in Freezing Soils
Into process and freezing front position.
Embodiment 2
Moisture transition process tracking implementation process is in frozen soil under open supplying water condition：
Soil sample, and fencing lawn diel are prepared according to water content and dry ground quality.The compound conserved is filled in
In soil sample groove, temperature sensor is inserted after filling to setting position, then soil sample groove is placed in lower cryostat groove 6, upper cryostat plate 5
It is placed at the top of the soil body, by the freezing liquid entrance point 6-3 on lower cryostat groove 6 and freezing liquid port of export 6-4 and upper cryostat plate 5
Freezing liquid import 5-2 and freezing liquid outlet 5-3 are respectively connecting to outside heat sink.The water supplement port of the lower cryostat plate 3 of connection is to outer
The geneva water bottle put, water supplement port 3-1 and exhaust outlet 3-2 is opened, the moisturizing passage in lower cryostat plate 3 is full of water and fluorescer
Mixed liquor, be then shut off water supplement port 3-1 and exhaust outlet 3-2, the wherein mixed liquor in geneva water bottle is every liter of water 5g fluorescence
Agent.And anti-icing fluid will be full of in lower cryostat groove 6, open outside heat sink and set to same temperature（+1°C）, start pair
The soil body carries out constant temperature.When inside soil body temperature reaches consistent, the water supplement port 3-1 on lower cryostat plate 3 is opened, and adjust in connection
For the outside heat sink of cryostat plate 5 to a certain subzero temperature, the outside heat sink of cryostat groove 6 is temperature-resistant under connecting, and opens purple
Light lamp and digital camera, follow the trail of water translocation process, Ice Formation Process and freezing front position in Freezing Soils.
Claims (9)
1. the experimental method of water translocation follow-up mechanism in a kind of frozen soil, it is completed by follow-up mechanism, it is characterised in that：It is first
First the compound of fluorescer, water and soil is filled in soil sample groove, from the temperature gaging hole in soil sample groove（1-1）Insert TEMP
Device, soil sample groove is then placed in lower cryostat groove（6）It is interior, by upper cryostat plate（5）The top for the soil body being placed in soil sample groove, connection are mended
The mouth of a river（3-2）To geneva water bottle, moisturizing passage is treated（3-1）It is interior be full of water after, close exhaust outlet（3-3）, then using connection
The upper cryostat plate of outside heat sink（5）With lower cryostat groove（6）Unidirectional cooling is carried out for the soil body, ultraviolet light is opened during experiment
And digital camera, follow the trail of the water translocation process in Freezing Soils；
The follow-up mechanism includes soil sample groove, upper cryostat plate（5）And lower cryostat groove（6）；
The soil sample groove includes the two lucite wide plates that parallel and symmetrical is set（1）, parallel and symmetrical set lucite
Narrow boards（2）And lower cryostat plate（3）, the lucite wide plate（1）With machine glass narrow boards（2）It is vertically arranged, organic glass
Glass wide plate（1）With machine glass narrow boards（2）Enclose the sample groove that cross section is rectangle（7）, the sample groove（7）Bottom be under it is cold
Bathe plate（3）；The lucite wide plate（1）With machine glass narrow boards（2）Through fixing bolt（4）It is located by connecting；The lucite
Wide plate（2）It is provided with several temperature gaging holes（1-1）；
The lower cryostat plate（3）Moisturizing passage is provided with upper（3-1）, the moisturizing passage（3-1）By connection water supplement port（3-2）With
Exhaust outlet（3-3）Main channel and connection soil sample bottom subchannel composition, the main channel connects with subchannel；
The upper cryostat plate（5）Including a rectangular tube（5-1）, the rectangular tube（5-1）It is provided with freezing liquid import（5-2）With it is cold
Freeze liquid outlet（5-3）；
The lower cryostat groove（6）Including poly (methyl methacrylate) plate groove（6-1）Be arranged at lucite board slot（6-1）The snakelike copper of bottom
Pipe（6-2）, the lucite board slot（6-1）Freezing liquid entrance point（6-3）With the freezing liquid port of export（6-4）Extend to machine glass
Glass plate groove（6-1）It is outside；
The soil sample groove is located at lower cryostat groove（6）Inside, the upper cryostat plate（5）The top of the soil body in soil sample groove.
2. the experimental method of water translocation follow-up mechanism in frozen soil according to claim 1, it is characterised in that：It is described organic
Glass wide plate（1）, lucite narrow boards（2）With lower cryostat plate（3）By fluid sealant and fixing bolt（4）Assembly is integrated.
3. the experimental method of water translocation follow-up mechanism in frozen soil according to claim 1, it is characterised in that：It is described organic
Glass wide plate（2）Light transmittance be at least 95%.
4. the experimental method of water translocation follow-up mechanism in frozen soil according to claim 1, it is characterised in that：It is described cold
Bathe plate（5）, lower cryostat plate（3）It is stainless steel.
5. the experimental method of water translocation follow-up mechanism in frozen soil according to claim 1, it is characterised in that：It is cold under described
Bath（6）Inside clear height and lower cryostat plate（3）Clear height it is identical.
6. the experimental method of water translocation follow-up mechanism in frozen soil according to claim 5, it is characterised in that：The moisturizing
Mouthful（3-2）And exhaust outlet（3-3）With lower cryostat plate（3）Top flushes.
7. the experimental method of water translocation follow-up mechanism in frozen soil according to claim 1, it is characterised in that：Enter for the soil body
Need to carry out 12h constant temperature processing before row unidirectional cooling, when native body temperature is consistent, then start the water supplement port that cools and open（3-2）.
8. the experimental method of water translocation follow-up mechanism in frozen soil according to claim 1, it is characterised in that：Freeze in the soil body
During knot, upper cryostat plate（5）Temperature be subzero temperature, lower cryostat groove（6）Temperature be+1 °C, be top-down Unidirectional Freezing
Pattern.
9. the experimental method of water translocation follow-up mechanism in frozen soil according to claim 1, it is characterised in that：The geneva
It is pure water and the mixture of fluorescer in water bottle, the volume of the fluorescer is every liter of water 5g.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107314964B (en) * | 2017-07-19 | 2018-09-25 | 中国水利水电科学研究院 | Frozen soil interflow water source type detection device based on tracer technique |
| CN108844988A (en) * | 2018-05-22 | 2018-11-20 | 石家庄铁道大学 | Soil body steam migration follow-up mechanism and Tracing Experiment method under Freezing-Melting Condition |
| CN110108748B (en) * | 2019-06-05 | 2021-09-10 | 安徽理工大学 | Frost heaving experimental device |
| CN111982868A (en) * | 2020-07-21 | 2020-11-24 | 河海大学 | Device and method for simulating migration of roadbed water vapor under freeze thawing-load coupling action |
| CN113720870B (en) * | 2021-09-22 | 2024-04-16 | 石家庄铁道大学 | Testing device and testing method for researching local deformation characteristics of frozen soil |
| CN114563441B (en) * | 2022-02-18 | 2023-12-22 | 中国农业大学 | Visualization device and method for soil freezing experiment |
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| CN204882378U (en) * | 2015-06-03 | 2015-12-16 | 石家庄铁道大学 | Water translocation process tracer in frozen soil |
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