CN202486125U - Experimental device for indoor frozen soil freezing and thawing circulation process - Google Patents
Experimental device for indoor frozen soil freezing and thawing circulation process Download PDFInfo
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- CN202486125U CN202486125U CN 201220004855 CN201220004855U CN202486125U CN 202486125 U CN202486125 U CN 202486125U CN 201220004855 CN201220004855 CN 201220004855 CN 201220004855 U CN201220004855 U CN 201220004855U CN 202486125 U CN202486125 U CN 202486125U
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Abstract
The utility model relates to an experimental device for an indoor frozen soil freezing and thawing circulation process. The experimental device is structurally characterized in that a soil sample is filled in a temperature control box, a temperature probe hole is arranged on the wall of the temperature control box, a temperature probe can be inserted into the soil sample inside the temperature control box through the probe hole, filter paper and a metal perforated plate are arranged at the bottom of the soil sample, a temperature control top plate and a temperature control bottom plate are respectively embedded into an organic glass barrel and are respectively connected with an external cold bath, a displacement sensor and a pull rod are arranged on the temperature control top plate, the organic glass barrel is placed in a frame formed by integrally connecting a support, a support rod and a fixing clamp rod, a groove is arranged on an outer ring of the temperature control bottom plate, a sealing ring is mounted on the groove and contacts with the high-pressure-resistant organic glass barrel, two small holes are arranged on the temperature control bottom plate, a water manifold penetrates through one hole and is connected with a mariotte bottle, and a water head adjusting pipe penetrates through the other hole and is positioned outside the frame. The experimental device can systematically research the freezing and thawing process of a soil body to obtain parameters such as water supplementing amount and frost heave and thawing settlement amount in freezing under the conditions of different temperature gradients and different soil properties, and provides technical and theoretical basis for preventing the engineering problems of frost heave and thawing settlement and the like.
Description
Technical field
The utility model relates to a kind of indoor frozen soil freeze thawing cyclic process test unit.Utilize this device, freezing process that can simulated soil body can be realized the real-time monitoring to factors vary processes such as temperature, frost heaving amount, thaw collapse amount in the soil body freezing process simultaneously.
Technical background
Frost heave and thaw collapse are the subject matter that will run in building in the cold district engineering.The soil body is in freezing process; Soil water branch (original position water and migration water) glaciation, and form the ice intrusive body of forms such as ice crystal, ice lens, fractional condensation ice sheet, cause the relative displacement between soil particle; Make the soil body produce frost heave in various degree; Frost heave can produce huge power, makes earth-retaining structure produce displacement, paves protuberance, distortion even the rupture failures such as basis, pipeline, fence of thing, structures.The thawing of freezing the soil body then can cause depression, can cause that the structures that are built in its top produce non-uniform settling, engineering diseases such as roadbed frost boiling.These have all caused very big harm to actual engineering.Some researchs in the past show that the water translocation in the soil body frozen-thaw process is the principal element that causes frost heave and thaw collapse.Therefore water translocation in frozen-thaw process is studied to the soil body, understands the changing condition of temperature field, moisture field and stress field in the frozen-thaw process, to preventing and treating the very strong realistic meaning that has of frost heave and thaw collapse.
The freeze thawing circulation is studied, and needing has following requirement to test unit: 1. can control respectively soil sample two ends temperature, come the actual temperature environment of simulated soil body; 2. test unit should be so that carry out moisturizing in the soil body frozen-thaw process; 3. can measure the dynamic change of soil body volume; 4. need and to measure inside soil body temperature in the frozen-thaw process.Generally speaking; Need satisfy conditions such as temperature conditions required in the frozen-thaw process, moisturizing condition, temperature acquisition and the quantitative determination of frost heave thaw collapse simultaneously; Thereby can carry out lab simulation to freezing the residing environment of the soil body, technology and theoretical the support are provided the prevention of engineering problems such as frost heave, thaw collapse in the open-air engineering in permafrost regions and control.
Summary of the invention
In view of above-mentioned, the purpose of the utility model is to provide a kind of succinct, easy indoor frozen soil freeze thawing cyclic process test unit of going.Utilize this device, can realize in the soil body frozen-thaw process, frost heave, thaw collapse amount, the measurement of benefit, water discharge is for prevention and the engineering problem that control body frost heaving and thaw collapse cause provide technical support.
The purpose of the utility model realizes through following measure:
A kind of indoor frozen soil freeze thawing cyclic process test unit comprises horse Liao Te bottle, support, cradling piece, temp probe hole, filter paper, temperature control base plate, aqueduct, head adjustable pipe, O-ring seal, metallic porous sheet, organic glass tube, fixedly clamping bar, displacement transducer, pull bar, temperature control top board, soil sample, temperature-controlled box.Soil sample is housed in the temperature-controlled box, has the temp probe hole on its wall, temp probe can insert in the box house soil sample through probe hole; The bottom of soil sample is equipped with filter paper and metallic porous sheet, and temperature control top board and temperature control base plate embed the organic glass tube respectively, and is connected with outside cryostat respectively; The temperature control top board is provided with displacement transducer and pull bar, and the organic glass tube places in support, cradling piece and the framework that fixedly clamping bar fuses, and there is a groove temperature control base plate outer ring; Adorning an O-ring seal on the groove contacts with high pressure resistant organic glass tube; Have two apertures on the temperature control base plate, aqueduct passes a hole and links to each other with horse Liao Te bottle, and the head adjustable pipe passes another hole and places outside the framework.
The utility model has the advantages that:
1. the utility model makes full use of the characteristics of organic glass tube poor thermal conductivity, can reduce in the process of the test environment temperature to the soil sample Influence of Temperature.
2. the temperature control top board is connected with displacement transducer, and the variation of soil body volume will directly be reflected on the displacement transducer in the frozen-thaw process, reaches the monitoring to body frost heaving, thaw collapse amount.
3. through on the plexi-glass tubular wall, drilling through the temp probe hole, can easily temp probe be inserted inside soil body, can obtain the dynamic changing process of soil sample different layers megadyne temperature degree in the process of the test.
4. seal with O-ring seal between organic glass tube and the temperature control base plate, can prevent that moisture oozes out from the tank body bottom in the soil body, can guarantee carrying out smoothly of moisturizing process.
5. adopt support that organic glass tube, temperature control base plate, temperature control top board are connected as a single entity, guaranteed the globality of whole test device, make things convenient for test operation.
6. temperature control top board end face is provided with pull bar, can conveniently the organic glass tube put into, taken out to the temperature control top board.
Description of drawings
Fig. 1 is the structural representation of the frozen-thaw process test unit of the utility model;
Fig. 2 is soil sample axial displacement changing curve in frozen-thaw process that the frozen-thaw process test unit of the utility model is measured;
Fig. 3 is soil sample different layers megadyne temperature degree change curve in frozen-thaw process in the process of the test measured of the frozen-thaw process test unit of the utility model.
Embodiment:
Below, in conjunction with accompanying drawing, the utility model technical scheme is further specified:
As shown in Figure 1; A kind of indoor frozen soil freeze thawing cyclic process test unit comprises horse Liao Te bottle 1, support 2, cradling piece 3, temp probe hole 4, filter paper 5, temperature control base plate 6, aqueduct 7, head adjustable pipe 8, O-ring seal 9, metallic porous sheet 10, organic glass tube 11, fixedly clamping bar 12, displacement transducer 13, pull bar 14, temperature control top board 15, soil sample 16, temperature-controlled box 17.Temperature-controlled box 17 can guarantee that its internal temperature reaches the required environment temperature of test.Soil sample 16 is housed in the temperature-controlled box 17, vertically has row's temp probe hole 4 on its wall, temp probe can insert in the box house soil sample 16 through probe hole 4, can gather the temperature variation of different layers position in the soil body experimentation.The bottom of soil sample 16 is equipped with filter paper 5 and metallic porous sheet 10, promptly can guarantee the perforation in soil sample 16 path in the moisturizing process, can the temperature of temperature control base plate 6 well be reflected at soil sample 16 bottom surfaces again.Temperature control top board 15 embeds organic glass tube 11 respectively with temperature control base plate 6, and is connected with outside cryostat respectively, can control the 16 upper and lower end temperature of soil sample in the experimentation.Temperature control top board 15 is provided with displacement transducer 13 and pull bar 14; Organic glass tube 11 places in support 2, cradling piece 3 and the framework that fixedly clamping bar 12 fuses; There is a groove temperature control base plate 6 outer rings; Adorn an O-ring seal 9 on the groove and contact with high pressure resistant organic glass tube 11, can guarantee in the moisturizing process, moisture is unlikely to ooze out from the space between organic glass tube 11 tank skins and the temperature control base plate 6.Have two apertures on the temperature control base plate 6, aqueduct 7 passes a hole and links to each other with horse Liao Te bottle 1, and it can be communicated with or disconnection the moisturizing condition that warranty test is required according to different Test Condition Requirements.Head adjustable pipe 8 passes another hole and places outside the framework, makes head height reach soil sample 16 bottom surfaces, then fixing head adjustable pipe 8.Realization is to the control of soil body moisturizing condition.Displacement transducer 13 well contacts with temperature control top board 15 end faces, makes the length travel of temperature control top board 15 can directly drive displacement transducer 13.The temp probe lead-in wire is connected with extraneous data collecting instrument respectively with displacement transducer 13 lead-in wires, realizes the continuous acquisition to data.Temperature control top board 15 is provided with pull bar 14, can easily temperature control top board 15 put into and take out from organic glass tube 11 by pull bar 14.
In order to verify the feasibility of whole test device, carried out shop experiment, test is that 24% loess presses off in nothing and carries out the freeze thawing circulation under the place system condition to water cut.Temperature-controlled box 17 is 1 ℃ with temperature control base plate 6 temperature, and temperature control top board 15 temperature are-20 ℃, in the process of the test continuous acquisition are carried out in soil sample temperature, displacement, and test findings is seen Fig. 2 and Fig. 3.
Claims (1)
1. indoor frozen soil freeze thawing cyclic process test unit; Comprise horse Liao Te bottle (1), support (2), cradling piece (3), temp probe hole (4), filter paper (5), temperature control base plate (6), aqueduct (7), head adjustable pipe (8), O-ring seal (9), metallic porous sheet (10), organic glass tube (11), fixedly clamping bar (12), displacement transducer (13), pull bar (14), temperature control top board (15), soil sample (16), temperature-controlled box (17); It is characterized in that being equipped with in the temperature-controlled box (17) soil sample (16); Have temp probe hole (4) on its wall; Temp probe can pass through probe hole (4) and insert in the box house soil sample (16), and the bottom of soil sample (16) is equipped with filter paper (5) and metallic porous sheet (10), and temperature control top board (15) and temperature control base plate (6) embed organic glass tube (11) respectively; And be connected with outside cryostat respectively; Temperature control top board (15) is provided with displacement transducer (13) and pull bar (12), and organic glass tube (11) places in support (2), cradling piece (3) and the framework that fixedly clamping bar (12) fuses, and there is a groove temperature control base plate (6) outer ring; Adorning an O-ring seal (9) on the groove contacts with high pressure resistant organic glass tube (11); Have two apertures on the temperature control base plate (6), aqueduct (7) passes a hole and links to each other with horse Liao Te bottle (1), and head adjustable pipe (8) passes another hole and places outside the framework.
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| CN 201220004855 CN202486125U (en) | 2012-01-05 | 2012-01-05 | Experimental device for indoor frozen soil freezing and thawing circulation process |
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| CN 201220004855 CN202486125U (en) | 2012-01-05 | 2012-01-05 | Experimental device for indoor frozen soil freezing and thawing circulation process |
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| CN102879552A (en) * | 2012-10-31 | 2013-01-16 | 河海大学 | Freeze thawing and frost heaving model test device and testing method thereof |
| CN103196753A (en) * | 2013-03-18 | 2013-07-10 | 长江水利委员会长江科学院 | Unidirectional freezing freeze-thaw cycle triaxial apparatus and test method thereof |
| CN103245771A (en) * | 2013-04-27 | 2013-08-14 | 同济大学 | Device and method for testing surrounding effect model by using artificial ground freezing method |
| CN103454012A (en) * | 2013-08-21 | 2013-12-18 | 中国科学院寒区旱区环境与工程研究所 | Device for measuring internal temperature of sample in process of low-temperature triaxial mechanical testing |
| CN103471884A (en) * | 2013-08-21 | 2013-12-25 | 中国科学院寒区旱区环境与工程研究所 | Manual unidirectional freezing layered sample preparation device suitable for high water (ice) content frozen earth |
| CN103487564A (en) * | 2013-07-23 | 2014-01-01 | 北京交通大学 | Double-chamber determinator for volume frost-heaving ratio of frozen soil |
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| CN103969421A (en) * | 2014-05-06 | 2014-08-06 | 中国铁道科学研究院铁道建筑研究所 | Frozen soil frost heave experiment device and frozen soil frost heave measuring method |
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| CN104297030A (en) * | 2014-10-15 | 2015-01-21 | 河海大学 | Device and method applied to preparation of samples for simulating natural formation process of frozen soil |
| CN104297451A (en) * | 2014-10-23 | 2015-01-21 | 石家庄铁道大学 | Large-grain-size soil body frost heaving performance testing device |
| CN104655823A (en) * | 2015-02-12 | 2015-05-27 | 中南大学 | Frost heaving meter |
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| CN104749011A (en) * | 2015-04-01 | 2015-07-01 | 中国科学院寒区旱区环境与工程研究所 | Preparation device of one-way freezing and thawing cycle soil sample |
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| CN109738478A (en) * | 2019-01-18 | 2019-05-10 | 绍兴文理学院元培学院 | A kind of high-precision body frost heaving process automation monitoring system |
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