CN204536235U - The proving installation of moisture porous medium freeze thawing feature - Google Patents
The proving installation of moisture porous medium freeze thawing feature Download PDFInfo
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- CN204536235U CN204536235U CN201520127207.5U CN201520127207U CN204536235U CN 204536235 U CN204536235 U CN 204536235U CN 201520127207 U CN201520127207 U CN 201520127207U CN 204536235 U CN204536235 U CN 204536235U
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Abstract
The utility model relates to a kind of proving installation of moisture porous medium freeze thawing feature, it is characterized in that adopting the double-deck system of inside and outside model casing, sample and various kinds of sensors to be arranged in model in case, model outer container mainly plays function of heat insulation, carry out temperature control and integral elevating temperature after the refrigeration coil arranged by external model box wall and bottom and two cryostats in outside are communicated with, inside and outside model casing mezzanine space can the low-freezing liquid such as filling alcohol, kerosene, ethylene glycol as filling liquid to improve temperature-controlled precision and constant temperature effect.The utility model is mainly used in testing moisture porous medium water and heat transport parameter in Frozen-thawed cycled process, comprises temperature, volume unfrozen water content, matric suction etc., and then draws the water characteristic curve of moisture porous medium in frozen-thaw process.The utility model has simple to operate, working stability, temperature-controlled precision is high, the fireballing feature of integral elevating temperature, and automatically carry out data acquisition by data collecting instrument, and then achieve the Validity Test of water and heat transport parameter in porous medium frozen-thaw process and the Obtaining Accurate of water characteristic curve.
Description
Technical field
The utility model relates to a kind of experiment test device, specifically refers to the proving installation of moisture porous medium freeze thawing feature.Utilize this device can realize overall temperature control to sample and fast freeze-thaw, effectively can measure the water and heat transport key element of sample in frozen-thaw process, change as temperature, volume unfrozen water content and matric suction etc. is tested, and is study the freeze thawing hydro-thermal variation characteristic of moisture porous medium and the efficient apparatus of freeze thawing water characteristic curve.
Background technology
The change of moisture porous medium water and heat transport parameter in Frozen-thawed cycled process causes its key factor producing frost-heaving and thawing, and the acquisition of water and heat transport parameter needs effective survey instrument and complete pilot system.The external way to the right and wrong saturated porous media drying and watering cycle analogy that the research of water characteristic curve in Frozen-thawed cycled process is generally taked at present, think that the thermal exchange of moisture porous medium and dehumidification and moisture absorption process have certain class same sex, gas just in dehumidification and moisture absorption process in soil pores is partly or entirely replaced (see Tezera F. Azmatch by solid ice in frozen-thaw process, David C. Sego, Lukas U. Arenson, Kevin W. Biggar. Using soil freezing characteristic curve to estimate the hydraulic conductivity function of partially frozen soils [J]. Cold Regions Science and Technology, 2012, 83 – 84, 103 – 109), so the direct measurement of freeze thawing characteristic parameter is eliminated, water characteristic ripe in unsaturated porous media mechanics theory is directly used in the research of the water characteristic in frozen-thaw process.Domestic also beginning in recent years uses novel test instrument to carry out tentative testing experiment (see Wen Zhi to water characteristic parameters in frozen-thaw process, Ma Wei, Xue Ke, Zhang Mingli, Yu Qihao. [J] is studied in the frozen soil water translocation based on pFmeter Matric potential sensor. and soil is circulated a notice of, 2014,45 (2): 370-375).As a whole, the class same sex of Frozen-thawed cycled and drying and watering cycle has been through verification experimental verification and mathematical, but difference between the two is also apparent, the freezing and melt the Phase-change Problems not only relating to moisture of moisture porous medium, and often along with moisture and solute transfer process, moisture distribution again and the uneven matric suction that will cause of such appearance have very big-difference at diverse location, this phenomenon is there is not in moisture absorption and dehumidification, certainly lag-effect mechanism in the mechanism that in drying and watering cycle process, lag-effect produces and frozen-thaw process is also had to there is larger difference, in such as frozen-thaw process except effects such as " ink bottles ", the supercooling phenomenon of water also can cause freezing and melt the inconsistent of curve.This just absolutely proves depends merely on that to study water characteristic in porous medium frozen-thaw process with the Analogy of drying and watering cycle process be far from being enough.
Therefore, in order to break away from the undue dependence of water characteristic research to drying and wetting water characteristic in frozen-thaw process, realize directly effectively measuring frozen-thaw process water and heat transport parameter (temperature, volume unfrozen water content, matric suction), improve the test of freeze thawing characteristic parameter, design a whole set of test unit that can realize obtaining moisture porous medium freeze thawing water characteristic to be necessary, to the scientific research of permafrost region agricultural production and engineering construction and practical work, there is important impetus.
Summary of the invention
For the problems referred to above, for realizing the direct measurement to frozen-thaw process water and heat transport parameter (temperature, volume unfrozen water content, matric suction etc.), the purpose of this utility model aims to provide the proving installation of moisture porous medium freeze thawing feature, Changing Pattern and the trend of moisture porous medium water and heat transport parameter in frozen-thaw process can be monitored, and the water characteristic curve in frozen-thaw process can be obtained by test figure.
For achieving the above object, the utility model is by the following technical solutions:
A proving installation for moisture porous medium freeze thawing feature, is made up of case, interior case base, interior case top cover, sealing ring, fairlead, fastening bolt, catheter, 1# cryostat, 2# cryostat, cryostat liquid, placement fluid, temperature sensor, moisture transducer, flow of water sensor, data collecting instrument and robot calculator in model outer container, outer container top cover, refrigeration coil, cryostat liquid interface, sensor lead hole, outer container base, model.Model outer container and outer container top cover separate the relatively independent space environment of formation one by outer container base and ground after fastener is closed.Model outer container sidewall is made up of the form of two-layered steel plates therebetween insulation material.In model, case is placed in model outer container, in model between case and model outer container, refrigeration coil is placed in the outer box wall of model and bottom in the mode of coiling, lateral wall is respectively equipped with the first cryostat liquid import, the second cryostat liquid import, the first cryostat liquid outlet and the outlet of the second cryostat liquid, exported by the first cryostat liquid import, catheter, refrigeration coil, 1# cryostat and the first cryostat liquid and carry out the circulation of cryostat liquid, equally, the circulation of cryostat liquid is carried out by the second cryostat liquid import, catheter, refrigeration coil, 2# cryostat and the outlet of the second cryostat liquid, in model, block drops on the interior case base of model outer container inner bottom part, in model, case is equipped with sample, distinguish laying temperature sensor in the sample, moisture transducer and flow of water sensor, placement fluid is poured between case in model outer container and model, in model, case is sealed by interior case top cover and sealing ring, fastening by fastening bolt again, sensor lead to cause in model outside case by the fairlead be arranged on interior case top cover, model outer container is drawn in sensor lead hole again by being arranged on outer container top cover, be connected with data collecting instrument, data collecting instrument is connected with robot calculator by wire.
The beneficial effect of major advantage of the present utility model and generation is:
1, the utility model is by overall temperature control method, in conjunction with existing sensor technology, the water and heat transport key element of the moisture porous medium of direct measurement in frozen-thaw process (temperature, volume unfrozen water content and matric suction etc.), and then data directly draw water characteristic curve by experiment.Thus avoid the unnecessary error indirectly being obtained the generation of frozen-thaw process soil-water characteristic curve by analogy drying and wetting soil-water characteristic curve, have found new method breach for directly obtaining frozen-thaw process moisture porous medium soil-water characteristic curve.
2, the utility model takes the double-deck system of inside and outside model casing, external mold molding box is utilized to be incubated, the refrigeration coil arranged by external model box wall and bottom carries out temperature control after being communicated with outside two cryostats and entirety heats up or cooling, placement fluid in inside and outside model casing interlayer can be the low-freezing liquid such as alcohol, kerosene, ethylene glycol to improve temperature-controlled precision and to ensure constant temperature effect, whole freezing-thawing test system is made to have working stability, temperature-controlled precision is high, the fireballing feature of integral elevating temperature.
The temperature control method of integrated elevator temperature that what 3, the utility model was taked is, does not establish thermograde, effectively controls the factor of influence number of test parameter in process of the test, simplify data analysis process, ensure that the controllability of test findings.
4, the utility model can adapt to the water and heat transport testing experiment of multiple moisture porous medium in frozen-thaw process, can choose sensor type and number according to different testing requirementss, applied widely, can Exploitation degree high.
5, the utility model also have that principle of work is clear and definite, test comprehensively, be easy to the advantages such as operation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Soil is the most typical porous medium system, and the present embodiment soil sample picks up from the Permafrost Area of Qinghai-Tibet Railway, is silty clay, has higher heave susceptibility.
Below in conjunction with accompanying drawing, the utility model is described further again:
As shown in Figure 1, the proving installation of moisture porous medium freeze thawing feature, is made up of case 7, interior case base 8, interior case top cover 9, sealing ring 10, fairlead 11, fastening bolt 12, catheter 13,1# cryostat 14,2# cryostat 15, cryostat liquid 16, placement fluid 17, temperature sensor 18, moisture transducer 19, flow of water sensor 20, data collecting instrument 21 and robot calculator 22 in model outer container 1, outer container top cover 2, refrigeration coil 3, cryostat liquid interface 4, sensor lead hole 5, outer container base 6, model.In model, case 7 and model outer container 1 can be rectangular parallelepiped or right cylinder.Model outer container 1 and outer container top cover 2 separate the relatively independent space environment of formation one by outer container base 6 and ground after fastener is closed.Model outer container 1 sidewall is by two-layered steel plates therebetween PVC insulation material.In model, case 7 is placed in model outer container 1, and in model between case 7 and model outer container 1, refrigeration coil 3 is placed in model outer container 1 madial wall and bottom in the mode of coiling, and refrigeration coil 3 can be copper or the good metal pipe material of aluminium thermal conductivity.Lateral wall is respectively equipped with the first cryostat liquid import 4, second cryostat liquid import 4 ', first cryostat liquid outlet 23 and the second cryostat liquid outlet 23 ', carry out cryostat liquid 16 by the first cryostat liquid import 4, catheter 13, refrigeration coil 3,1# cryostat 14 and the first cryostat liquid outlet 23 to circulate, equally, carry out cryostat liquid 16 by the second cryostat liquid import 4 ', catheter 13, refrigeration coil 3,2# cryostat 15 and the second cryostat liquid outlet 23 ' to circulate, carry out circularly cooling with cryostat liquid 16 or heat.In model, case 7 is located on the interior case base 8 of model outer container 1 inner bottom part, in model, case 7 is equipped with sample---silty clay, respectively laying temperature sensor 18, moisture transducer 19 and flow of water sensor 20 in the sample, pours into placement fluid 17 to ensure temperature control effect between case 7 in model outer container 1 and model.Placement fluid 17 is alcohol or kerosene or ethylene glycol low-freezing liquid.In model, case 7 is sealed by interior case top cover 9 and sealing ring 10, fastening by fastening bolt 12 again, to ensure that temperature control effect sensor lead-in wire to cause in model outside case 7 by the fairlead 11 be arranged on interior case top cover 9, model outer container 1 is drawn in sensor lead hole 5 again by being arranged on outer container top cover 2, be connected with data collecting instrument 21, data collecting instrument 21 is connected with robot calculator 22 by wire, completes automatic data collection.
In implementation process, first in model, required sample is installed in case 7 according to testing program, temperature sensor 18, moisture transducer 19 and flow of water sensor 20 are laid in test point position place simultaneously, sealing ring 10 is put well in case port recess, again interior case top cover 9 is adjacent to sealing ring 10 to build, and the fairlead 11 of sensor lead from interior case top cover 9 top is drawn, then with fastening bolt, interior case top cover 9 is fastened as a whole with case 7 in model.Next interior case base 8 is put into bottom model outer container 1, after adjusting position, case 7 in model good for fit sealing is placed on interior case base 8 together with inner sample and sensor, and sensor lead is drawn from the sensor lead hole outer container top cover 2, be connected with data collecting instrument 21 after extraction, data collecting instrument 21 connects power supply, and completes automatic data collection by robot calculator 22.1# cryostat 14 is connected by the cryostat liquid interface 4 of catheter 13 with model outer container about 1 sidewall with 2# cryostat 15, opens outside cryostat after on-test, and cryostat liquid 16 enters refrigeration coil 3 circularly cooling by cryostat liquid interface 4 or heats.Inside and outside model casing mezzanine space filling alcohol or the low-freezing such as kerosene or ethylene glycol liquid as placement fluid 17 to improve temperature-controlled precision and constant temperature effect.
Claims (1)
1. a proving installation for moisture porous medium freeze thawing feature is by model outer container (1), outer container top cover (2), refrigeration coil (3), cryostat liquid interface (4), sensor lead hole (5), outer container base (6), case (7) in model, interior case base (8), interior case top cover (9), sealing ring (10), fairlead (11), fastening bolt (12), catheter (13), 1# cryostat (14), 2# cryostat (15), cryostat liquid (16), placement fluid (17), temperature sensor (18), moisture transducer (19), flow of water sensor (20), data collecting instrument (21) and robot calculator (22) composition, model outer container (1) and outer container top cover (2) separate the relatively independent space environment of formation one by outer container base (6) and ground after fastener is closed, it is characterized in that model outer container (1) sidewall is made up of the form of two-layered steel plates therebetween insulation material, in model, case (7) is placed in model outer container (1), in model between case (7) and model outer container (1), refrigeration coil (3) is placed in model outer container (1) madial wall and bottom in the mode of coiling, and lateral wall is respectively equipped with the first cryostat liquid import (4), second cryostat liquid import (4 '), first cryostat liquid outlet (23) and the second cryostat liquid outlet (23 '), by the first cryostat liquid import (4), catheter (13), refrigeration coil (3), 1# cryostat (14) and the first cryostat liquid outlet (23) carry out cryostat liquid (16) circulation, equally, by the second cryostat liquid import (4 '), catheter (13), refrigeration coil (3), 2# cryostat (15) and the second cryostat liquid outlet (23 ') carry out cryostat liquid (16) circulation, in model, case (7) is located on the interior case base (8) of model outer container (1) inner bottom part, in model, case (7) is equipped with sample, distinguish laying temperature sensor (18) in the sample, moisture transducer (19) and flow of water sensor (20), placement fluid (17) is poured between case (7) in model outer container (1) and model, in model, case (7) is sealed by interior case top cover (9) and sealing ring (10), fastening by fastening bolt (12) again, sensor lead causes case in model (7) outward by the fairlead (11) be arranged on interior case top cover (9), model outer container (1) is drawn in sensor lead hole (5) again by being arranged on outer container top cover (2), be connected with data collecting instrument (21), data collecting instrument (21) is connected with robot calculator (22) by wire.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730100A (en) * | 2015-03-05 | 2015-06-24 | 中国科学院寒区旱区环境与工程研究所 | Device for testing hydrothermal variation features of hydrous porous medium in freeze thawing process |
| CN108982328A (en) * | 2018-08-14 | 2018-12-11 | 中南大学 | A kind of method that rock pore volume deforms under calculating unfreezing |
| CN110261583A (en) * | 2019-07-23 | 2019-09-20 | 石河子大学 | The experimental method of the low moisture holding capacity porous media water characteristic curve of precise measurement |
| CN113984807A (en) * | 2021-10-28 | 2022-01-28 | 中国科学院西北生态环境资源研究院 | Test method for rock fracture real-time expansion based on freeze thawing and fracturing |
| CN113984808A (en) * | 2021-10-28 | 2022-01-28 | 中国科学院西北生态环境资源研究院 | Test method for expanding rock fracture by freezing method |
-
2015
- 2015-03-05 CN CN201520127207.5U patent/CN204536235U/en not_active Withdrawn - After Issue
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730100A (en) * | 2015-03-05 | 2015-06-24 | 中国科学院寒区旱区环境与工程研究所 | Device for testing hydrothermal variation features of hydrous porous medium in freeze thawing process |
| CN104730100B (en) * | 2015-03-05 | 2017-08-11 | 中国科学院寒区旱区环境与工程研究所 | A kind of device for testing aqueous porous media in frozen-thaw process reclaimed water thermal change feature |
| CN108982328A (en) * | 2018-08-14 | 2018-12-11 | 中南大学 | A kind of method that rock pore volume deforms under calculating unfreezing |
| CN108982328B (en) * | 2018-08-14 | 2019-09-27 | 中南大学 | A kind of method that rock pore volume deforms under calculating unfreezing |
| CN110261583A (en) * | 2019-07-23 | 2019-09-20 | 石河子大学 | The experimental method of the low moisture holding capacity porous media water characteristic curve of precise measurement |
| CN110261583B (en) * | 2019-07-23 | 2022-03-04 | 石河子大学 | Experimental method for accurately measuring water characteristic curve of porous medium with low water holding capacity |
| CN113984807A (en) * | 2021-10-28 | 2022-01-28 | 中国科学院西北生态环境资源研究院 | Test method for rock fracture real-time expansion based on freeze thawing and fracturing |
| CN113984808A (en) * | 2021-10-28 | 2022-01-28 | 中国科学院西北生态环境资源研究院 | Test method for expanding rock fracture by freezing method |
| CN113984808B (en) * | 2021-10-28 | 2023-07-21 | 中国科学院西北生态环境资源研究院 | Test method for expanding rock fracture by freezing method |
| CN113984807B (en) * | 2021-10-28 | 2023-07-21 | 中国科学院西北生态环境资源研究院 | Test method for real-time expansion of rock fracture under freezing-thawing and fracturing actions |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150805 Effective date of abandoning: 20170811 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20150805 Effective date of abandoning: 20170811 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |