CN106525661A - Unsaturated soil vaporous water transfer characteristic testing device and testing method thereof - Google Patents
Unsaturated soil vaporous water transfer characteristic testing device and testing method thereof Download PDFInfo
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- CN106525661A CN106525661A CN201610968749.4A CN201610968749A CN106525661A CN 106525661 A CN106525661 A CN 106525661A CN 201610968749 A CN201610968749 A CN 201610968749A CN 106525661 A CN106525661 A CN 106525661A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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Abstract
The invention discloses an unsaturated soil vaporous water transfer characteristic testing device and a testing method thereof. The unsaturated soil vaporous water transfer characteristic testing device comprises a testing model system and a temperature and humidity control system, wherein the testing model system comprises a testing cavity, and a plurality of containers which are arranged in the testing cavity and are used for holding soil body test samples; cooling devices are arranged on the tops of the containers; the containers are wound with corresponding vacuum heat insulating cavities; the temperature and humidity control system is communicated with the bottoms of the containers through pipelines, and is used for regulating and controlling the temperature and humidity of the soil body test samples; temperature sensors for monitoring the temperature of the soil body test samples and moisture sensors for monitoring the water content of the soil body test samples are arranged in the containers. The testing device is an experimental device for measuring the transfer rules of a plurality of groups of vaporous water of different temperature and relative humidity at a one-dimensional temperature gradient, so that a theoretical basis is laid for accurate control of a vaporous water supplement boundary.
Description
Technical field
The present invention relates to a kind of unsaturated soil vapour complex characteristic test device and method of testing, belong to building（Ground）
Field of engineering technology.
Background technology
Subgrade defect always perplexs China's road, railway, a major issue of airport construction.Aqueous vapor is in thermograde
Under vertical migration be the main cause disaster such as cause frost heave, rise soil.
Current research is concentrated mainly on the migration of aqueous water, and subsoil water is also possible to migrate by gaseous form.It is right
In the soil that level of ground water is relatively shallow, capillary is stronger, in soil, humidity is based on aqueous water supply；For arid or half-dried nonirrigated farmland
Area, evaporation capacity are big, subsoil water locating depth, and humidity is found in engineering such based on vapour complex in the whole unsaturated soil body
Area, below coating, high humidity quantity set gathers, or even the soil body reaches saturation under coating.Teng etc.（2015）Such phenomenon is fixed
Justice is pot cover effect, and points out that sublimating into ice by vaporous water in unsaturated soil body causes.
At present, both at home and abroad for the research of the migration rule of water in the unsaturation soil body is concentrated mainly on aqueous water, and for
The research of vapour complex characteristic, the method for employing are that the soil body is filled in pvc pipe, are then docked two-by-two, and joint is reserved
The space of about 1 cm, places gauze wherein, so as to realize intercepting the purpose of aqueous water, research vaporous water.And the method is not
The temperature and concentration of the accurate gaseous water of energy, causes, work not accurate enough extensively to the research moved with regard to unsaturated soil humidity
The disaster that humidity transfer is caused is failed targetedly to be prevented and treated in journey.
The content of the invention
The present invention is intended to provide a kind of unsaturated soil vapour complex characteristic test device and method of testing, the test device
Multigroup different temperatures is measured simultaneously can, the vaporous water of relative humidity is filled in the experiment of the lower migration rule of one-dimension temperature gradient or so
Put, so as to the precise control to realize vaporous water contour of recharge is provided fundamental basis.
To achieve these goals, the technical solution adopted in the present invention is：
A kind of unsaturated soil vapour complex characteristic test device, which is structurally characterized in that, including test model system and humiture
Control system；The test model system includes test cavity, is arranged on multiple appearances for holding soil body sample of test intracavity
Device, each container top are provided with chiller, and each container is wrapped by corresponding vacuum insulation chamber；The Temperature and Humidity Control
System is connected with the bottom of the container by pipeline, and for regulating and controlling the temperature and humidity of soil body sample, the container content has
For monitoring the temperature sensor of soil body sample temperature and the moisture transducer of monitoring soil body sample moisture content.
Embodiments in accordance with the present invention, can also make further optimization, below the skill to be formed after optimization to the present invention
Art scheme：
Further, present invention additionally comprises subzero temperature control chamber, the chiller is the chill plate for being encapsulated in container top, the system
Cold dish is connected with subzero temperature control chamber by pipeline；It is preferred that circulation is provided with and chill plate between at the top of soil body sample in the container
Chamber or the chill plate are connected with the subzero temperature control chamber equipped with freezing liquid by cooling pipe.The circulation intracavity is provided with turbulent flow and disturbs
Moving plate.It is preferred that chill plate is refrigeration aluminium dish.
Embodiments in accordance with the present invention, the temperature and humidity control system include temprature control unit and humid control part,
Wherein temprature control unit includes heater and refrigerator, and the humid control part includes ultrasound wave dehumidifier and humidifier,
The temprature control unit and humid control part pass through pipeline and the reservoir.Thus, according to temperature sensor monitors
Temperature so as to determining to start heater or starting refrigerator, according to the moisture content of moisture transducer monitoring so as to determining to be
Start dehumidifier or humidifier.
Preferably, the test model system includes framework, and the heat insulation layer for wrapping up the vacuum chamber is provided with the framework；It is excellent
Elect polystyrene heat insulation layer as.
The temperature and humidity control system includes for arranging the sealing chamber of the temprature control unit and humid control part,
The sealing chamber is wrapped with heat-insulation layer.
In order to control gas flowing, so that temperature and humidity is more uniform, the circulation intracavity is provided with turbulence prediction piece.
Understand in real time the temperature and humidity situation of the gas being passed through in container for convenience, the temperature and humidity control system with
Temperature Humidity Sensor is provided with connecting pipe between the bottom of container.
The container bottom is provided with nadel, is separated by grid between nadel and soil body sample.
For the scope that compensation temperature radially changes along soil body sample, and weaken due to container material and soil body sample
Difference causes the variant impact for bringing of longitudinal rate of heat transfer, the container to include two concentric drums, and wherein inner core is placed and treated
Soil body sample is surveyed, for the change of analytical soil sample sample moisture content and temperature, the soil body examination of the same race held between outer tube and inner core
Sample.
Based on same inventive concept, present invention also offers a kind of using described unsaturated soil vapour complex characteristic
The method tested to unsaturated soil vapour complex characteristic by test device, which comprises the steps：
S1, the dried soil body to be measured is loaded in container in batches, by compactness point multilamellar compacting shaping, obtain soil body sample；
S2, by moisture transducer and temperature sensor insertion soil body sample, and container is placed in test model system, and
Container top fills refrigerating plant, seals the coboundary of soil body sample；
S3, by computer end arrange chill plate temperature be 0 DEG C, steam temperature be T' degree Celsius, the moisture content in steam be θ '；
Activation system, temperature T and moisture content θ of gas in Temperature Humidity Sensor record test model system；
S4, as the temperature T ＞ T' of temperature sensor monitors gas, temperature and humidity control system to soil body sample lower the temperature, as T ＜ T'
When, temperature and humidity control system heats up to soil body sample, until T=T'；When moisture transducer monitors the moisture content θ ＞ θ ' of gas,
Temperature and humidity control system dehumidifies to soil body sample, and as θ ＜ θ ', temperature and humidity control system is humidified to soil body sample,
Until θ=θ '；
After S5, a working cycle terminate, the moisture content that soil body sample measures each layer is taken, the Temperature Distribution for obtaining soil body sample is bent
Line and porous media curve.
Compared with prior art, the invention has the beneficial effects as follows：
1st, vaporous water of the invention reach characteristic test device controls the temperature and humidity of lower boundary make-up gas exactly.
2nd, the present invention on top boundary simulate surface soil under natural conditions occur under different humiture air effects it is right
The process of heat is spread, simulate different from conduction of heat between two solid phases traditionally, it is of the invention it is also possible to consider surface evaporation situation,
It is more accurate in terms of simulation rate of heat transfer.
3rd, two concentric test specimen tubes are included in sample case of the invention, internal test specimen tube is placed the soil body sample of research, used
In analytical soil sample sample moisture content temperature change；The soil body sample of the same race that external sample cylinder holds, can so solve two it is difficult
Topic：One counteracts the scope that temperature radially changes along soil body sample, and which two weakens test specimen tube due to material and the soil body
Sample is different, the variant impact for bringing of longitudinal rate of heat transfer.
Description of the drawings
Fig. 1 is the structural representation of test model system of the present invention；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is the structural representation of temperature and humidity control system of the present invention；
Fig. 4 is temperature control flow figure of the present invention；
Fig. 5 is humid control flow chart of the present invention.
In figure
1- proof boxs；2- soil body samples；3- flexible pipes；4- heat insulation layers；5- frameworks；6- nadels；7- torus；8- flexible pipes；9-
Temperature sensor；10- Temperature Humidity Sensors；11- moisture transducers；12- Hygrothermographs；13- heat screens.
Specific embodiment
Below with reference to accompanying drawing and in conjunction with the embodiments describing the present invention in detail.It should be noted that in the feelings not conflicted
Under condition, the embodiment and the feature in embodiment in the present invention can be mutually combined.For sake of convenience, hereinafter as occurred
" on ", D score, "left", "right" printed words, only represent consistent with the upper and lower, left and right direction of accompanying drawing itself, structure limited
It is set for using.
A kind of unsaturated soil vapour complex characteristic test device, it is as shown in Figure 1-2, including test model system, warm and humid
Degree control system and subzero temperature control chamber.
As illustrated in fig. 1 and 2, on the inside of test model system it is cylindrical lucite cylinder as container, inside holds soil
Body sample, outside is toroidal vacuum chamber, and lucite cylinder has the through hole of temperature sensor and humidity sensor.The soil body is tried
Specimen chamber upper end be aluminium dish, aluminium dish UNICOM subzero temperature control chamber.The bottom of lucite cylinder passes through pipeline communication temperature and humidity control system,
Temperature Humidity Sensor is set in the pipeline, and the bottom of lucite cylinder is provided with nadel, for disturbing the flowing of gas.Cavity
Air inlet is orthogonal with the horizontal plane of gas outlet.
Temperature and humidity control system includes sealing chamber made by a lucite, closing interior be provided with humid control part and
Humid control part, by insulation heat insulation layer parcel outside sealing chamber.In three mutually perpendicular inwalls of lucite sealing chamber
Between lay small-sized fanses respectively.Temprature control unit includes resistance heater, refrigerator.Humid control part includes dehumidifier
And ultrasonic humidifier, humid control part is connected to temperature-controlled chamber by rubber hose.The control of humiture is compiled by computer
Cheng Shixian, it is setting value to automatically adjust the temperature caused in gaseous state water circulation system, relative humidity.
The unsaturated soil vapour complex characteristic test method step of the present invention is as follows：
First, dried soil body sample is loaded in lucite cylinder in batches, shapes by five lamination of compactness point for calculating is real, obtain
To soil body sample；
2nd, by moisture transducer and temperature sensor insertion soil body sample；
3rd, after laying turbulence prediction blade, lucite cylinder is placed in test model system；
4th, in one layer of glass infuser top square preservative film, together it is pressed in glass sleeve with refrigeration aluminium dish, in sealing soil body sample
Border；
5th, computer end arrange chill plate temperature be 0 DEG C, steam temperature be T' degree Celsius, humidity be θ ', activation system, gas
Body circulation pump work, temperature T humidity θ of gas in Temperature Humidity Sensor record test model system；
6th, after a N days working cycle terminates, take the moisture content that soil body sample measures five layers, obtain temperature distribution history and
Porous media curve.
Present invention achieves " while the multigroup different temperatures of measurement, the vaporous water of relative humidity are in one-dimension temperature gradient or so
Lower migration rule ", so that each sample connects different temperature and humidity control systems, it is concrete as shown in Figure 2.
The bottom of proof box of the present invention is connected with the vapor of uniform temperature and concentration, and a humidity is provided with bottom inlet
Sensor, feedback to the computer end so that the concentration for leading to the vapor come in is adjustable to setting value, additionally, soil body sample
The moisture transducer of several measurement moisture content can be placed in middle part.
The content that above-described embodiment is illustrated should be understood to that these embodiments are only used for being illustrated more clearly that the present invention, and not
For limiting the scope of the present invention, after the present invention has been read, the various equivalent form of values of the those skilled in the art to the present invention
Modification each fall within the application claims limited range.
Claims (10)
1. a kind of unsaturated soil vapour complex characteristic test device, it is characterised in that including test model system and humiture
Control system；The test model system includes test cavity, is arranged on multiple appearances for holding soil body sample of test intracavity
Device, each container top are provided with chiller, and each container is wrapped by corresponding vacuum insulation chamber；The Temperature and Humidity Control
System is connected with the bottom of the container by pipeline, and for regulating and controlling the temperature and humidity of soil body sample, the container content has
For monitoring the temperature sensor of soil body sample temperature and the moisture transducer of monitoring soil body sample moisture content.
2. unsaturated soil vapour complex characteristic test device according to claim 1, it is characterised in that also including subzero temperature
Control chamber, the chiller is the chill plate for being encapsulated in container top, and the chill plate is connected with subzero temperature control chamber by pipeline；
It is preferred that be provided with and chill plate between at the top of soil body sample in the container torus or the chill plate by cooling pipe with
The connection of subzero temperature control chamber equipped with freezing liquid.
3. unsaturated soil vapour complex characteristic test device according to claim 1, it is characterised in that the humiture
Control system includes temprature control unit and humid control part, and wherein temprature control unit includes heater and refrigerator, institute
Stating humid control part includes that ultrasound wave dehumidifier and humidifier, the temprature control unit and humid control part pass through pipeline
With the reservoir.
4. unsaturated soil vapour complex characteristic test device according to claim 3, it is characterised in that the humiture
Control system includes that for arranging the sealing chamber of the temprature control unit and humid control part the sealing chamber is wrapped with guarantor
Warm layer.
5. unsaturated soil vapour complex characteristic test device according to claim 1, it is characterised in that the humiture
Temperature Humidity Sensor is provided with connecting pipe between control system and the bottom of container.
6. unsaturated soil vapour complex characteristic test device according to claim 2, it is characterised in that the torus
Turbulence prediction piece is provided with inside.
7. unsaturated soil vapour complex characteristic test device according to claim 1, it is characterised in that the test mould
Type system includes framework, and the heat insulation layer for wrapping up the vacuum chamber is provided with the framework；Preferably polystyrene heat insulation layer；It is preferred that many
Connected with temperature and humidity control system by independent pipeline between individual container.
8. the unsaturated soil vapour complex characteristic test device according to one of claim 1-7, it is characterised in that described
Container bottom is provided with nadel, is separated by grid between nadel and soil body sample.
9. the unsaturated soil vapour complex characteristic test device according to one of claim 1-7, it is characterised in that described
Container includes two concentric drums, and wherein inner core places soil body sample to be measured, for analytical soil sample sample moisture content and temperature
Change, the soil body sample of the same race held between outer tube and inner core.
10. the unsaturated soil vapour complex characteristic test device described in a kind of one of utilization claim 1-9 is to unsaturated soil
The method tested by vapour complex characteristic, it is characterised in that comprise the steps：
S1, the dried soil body to be measured is loaded in container in batches, by compactness point multilamellar compacting shaping, obtain soil body sample；
S2, by moisture transducer and temperature sensor insertion soil body sample, and container is placed in test model system, and
Container top fills refrigerating plant, seals the coboundary of soil body sample；
S3, by computer end arrange chill plate temperature be 0 DEG C, steam temperature be T' degree Celsius, the moisture content in steam be θ '；
Activation system, temperature T and moisture content θ of gas in Temperature Humidity Sensor record test model system；
S4, as the temperature T ＞ T' of temperature sensor monitors gas, temperature and humidity control system to soil body sample lower the temperature, as T ＜ T'
When, temperature and humidity control system heats up to soil body sample, until T=T'；When moisture transducer monitors the moisture content θ ＞ θ ' of gas,
Temperature and humidity control system dehumidifies to soil body sample, and as θ ＜ θ ', temperature and humidity control system is humidified to soil body sample,
Until θ=θ '；
After S5, a working cycle terminate, the moisture content that soil body sample measures each layer is taken, the Temperature Distribution for obtaining soil body sample is bent
Line and porous media curve.
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Cited By (11)
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| CN109613067A (en) * | 2019-01-09 | 2019-04-12 | 哈尔滨工业大学 | Electric osmose drainage test system in a kind of unsaturation subgrade soils room |
| CN109709020A (en) * | 2019-01-24 | 2019-05-03 | 中南大学 | The gas permeability test macro and test method of unsaturation frozen soil |
| CN109813866A (en) * | 2019-01-24 | 2019-05-28 | 中南大学 | The measuring system and measurement method of unsaturation frozen soil matric potential |
| CN109972604A (en) * | 2019-04-02 | 2019-07-05 | 王国福 | A kind of highway experiment compactness sample detection means |
| CN110057866A (en) * | 2019-05-22 | 2019-07-26 | 南京林业大学 | A kind of test device and test method that the soil body-structural interface heating influences soil temperature |
| CN110455703A (en) * | 2019-09-02 | 2019-11-15 | 中南大学 | A kind of test device and its test method of compacted soil vaporous water and lyotropic salt migration |
| CN111537665A (en) * | 2020-05-21 | 2020-08-14 | 福州大学 | Device and method for simulating moisture migration process in high-voltage oiled paper insulation sleeve |
| CN112834727A (en) * | 2021-01-06 | 2021-05-25 | 中国科学院西北生态环境资源研究院 | Surface environment monitor |
| CN113009114A (en) * | 2021-03-10 | 2021-06-22 | 中国水利水电科学研究院 | Test device for generating, transmitting and monitoring temperature-controlled water vapor in soil body gradual humidification test |
| CN113049774A (en) * | 2021-03-09 | 2021-06-29 | 西安建筑科技大学 | Device and method for testing migration of soil gaseous water under high-temperature action |
| CN113252873A (en) * | 2021-05-11 | 2021-08-13 | 西安建筑科技大学 | A test monitoring devices for salt-affected soil water salt migration |
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| CN109613067A (en) * | 2019-01-09 | 2019-04-12 | 哈尔滨工业大学 | Electric osmose drainage test system in a kind of unsaturation subgrade soils room |
| CN109709020A (en) * | 2019-01-24 | 2019-05-03 | 中南大学 | The gas permeability test macro and test method of unsaturation frozen soil |
| CN109813866A (en) * | 2019-01-24 | 2019-05-28 | 中南大学 | The measuring system and measurement method of unsaturation frozen soil matric potential |
| CN109709020B (en) * | 2019-01-24 | 2023-11-07 | 中南大学 | Air permeability test system and test method for unsaturated frozen soil |
| CN109813866B (en) * | 2019-01-24 | 2021-08-17 | 中南大学 | Method for measuring matrix potential of unsaturated frozen soil |
| CN109972604B (en) * | 2019-04-02 | 2020-10-23 | 王国福 | Compactness sample detection device for highway experiments |
| CN109972604A (en) * | 2019-04-02 | 2019-07-05 | 王国福 | A kind of highway experiment compactness sample detection means |
| CN110057866A (en) * | 2019-05-22 | 2019-07-26 | 南京林业大学 | A kind of test device and test method that the soil body-structural interface heating influences soil temperature |
| CN110455703A (en) * | 2019-09-02 | 2019-11-15 | 中南大学 | A kind of test device and its test method of compacted soil vaporous water and lyotropic salt migration |
| CN111537665A (en) * | 2020-05-21 | 2020-08-14 | 福州大学 | Device and method for simulating moisture migration process in high-voltage oiled paper insulation sleeve |
| CN112834727A (en) * | 2021-01-06 | 2021-05-25 | 中国科学院西北生态环境资源研究院 | Surface environment monitor |
| CN112834727B (en) * | 2021-01-06 | 2023-09-22 | 中国科学院西北生态环境资源研究院 | Earth surface environment monitor |
| CN113049774A (en) * | 2021-03-09 | 2021-06-29 | 西安建筑科技大学 | Device and method for testing migration of soil gaseous water under high-temperature action |
| CN113009114A (en) * | 2021-03-10 | 2021-06-22 | 中国水利水电科学研究院 | Test device for generating, transmitting and monitoring temperature-controlled water vapor in soil body gradual humidification test |
| CN113009114B (en) * | 2021-03-10 | 2022-03-08 | 中国水利水电科学研究院 | Test device for generating, transmitting and monitoring temperature-controlled water vapor in soil body gradual humidification test |
| CN113252873A (en) * | 2021-05-11 | 2021-08-13 | 西安建筑科技大学 | A test monitoring devices for salt-affected soil water salt migration |
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