CN113447639A - Frozen soil freeze-thaw cycle process simulation device - Google Patents
Frozen soil freeze-thaw cycle process simulation device Download PDFInfo
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- CN113447639A CN113447639A CN202110704879.8A CN202110704879A CN113447639A CN 113447639 A CN113447639 A CN 113447639A CN 202110704879 A CN202110704879 A CN 202110704879A CN 113447639 A CN113447639 A CN 113447639A
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Abstract
The invention discloses a frozen soil freezing and thawing cycle process simulation device, which comprises a transparent container, an upper cold bath tray, a lower cold bath tray, a water and soil partition plate, a cavity partition plate and a cold bath tank, wherein the upper cold bath tray is arranged on the transparent container; the upper cooling bath tray is used for sealing the top of the transparent container; the lower cooling bath tray is used for sealing the bottom of the transparent container; the water and soil partition plate is arranged in the transparent container, is detachably arranged on the lower cold bath tray, and forms a water storage cavity between the water and soil partition plate and the lower cold bath tray; the cavity separating partition plate is arranged in the transparent container, the cavity separating partition plate is detachably connected with the transparent container, and the cavity separating partition plate is used for vertically separating the interior of the transparent container into a plurality of experimental cavities; the cold bath groove is connected and communicated with the upper cold bath disc and the lower cold bath disc and is used for regulating and controlling the temperature change of the upper cold bath disc and the lower cold bath disc in the experimental process; therefore, when the device is applied, different soil bodies can be placed into different experimental cavities, synchronous experimental comparison is carried out, and the problem that multiple simulation experiments cannot be carried out simultaneously in the prior art is practically solved.
Description
Technical Field
The invention relates to the technical field of research on a frozen soil freezing and thawing cycle process, in particular to a frozen soil freezing and thawing cycle process simulation device.
Background
The freezing and thawing action generated in the natural environment is a long-term process for the soil body, and in order to meet the engineering construction requirements and obtain the performance change of the soil body under the freezing and thawing circulation action as soon as possible, an indoor acceleration test is an important means for researching the freezing and thawing characteristics of the soil body. The tests performed on frozen soil are mainly divided into two aspects, namely, on one hand, the change of physical and mechanical properties of the frozen soil before and after the frozen soil is subjected to the action of freeze-thaw cycles, and on the other hand, the stress-strain, temperature, moisture and salt migration rules of the frozen soil during the freeze-thaw cycles.
According to different test purposes, the adopted sample sizes are different, in order to realize the mechanical property tests of triaxial compression, direct shearing and the like on the soil sample after freeze-thaw cycling, the test soil sample is generally made into a size suitable for the mechanical test, for example, a cylindrical test piece with the height and the diameter not more than 150mm is generally used as a research object in the current indoor freeze-thaw test. However, the cylindrical test piece with the smaller size cannot well simulate the diffusion mode of heat energy and moisture in the actual working condition no matter a unidirectional, bidirectional or multidirectional freezing and thawing mode is adopted.
In order to discuss the temperature change and the moisture migration condition of frozen soil in the freezing-thawing cycle process, researchers make a plurality of large-size freezing-thawing cycle tests, the current test research on the moisture migration of soil bodies in the freezing process at home and abroad is relatively less, and most of test equipment adopts a traditional moisture migration test device. The traditional test device system consists of a sample cylinder, a top plate, a base, a March's flask and a cold bath machine. The device can carry out conventional freeze thawing test to the soil body to can realize the real-time supervision of data such as temperature, deformation, play important effect in studying soil body frost heaving law experiment.
A sample cylinder adopted by a traditional test device system is generally circular and has a small diameter, most of the sample cylinders have the diameter of 10cm-30cm, and the requirement of manufacturing a model with a large roadbed slenderness ratio cannot be met; secondly, the sample cylinders in the traditional device are small in height and are distributed in a concentrated manner at the height of 20-60cm, so that only samples of uniform soil layers can be manufactured, and the actual geological conditions of the roadbed and the foundation below the roadbed with different soil textures cannot be met; moreover, the traditional device is provided with the sensor line outlet holes which are reserved at the positions where the sensors are embedded respectively, so that the requirement of flexibly embedding the sensors cannot be met; moreover, the application of the freeze thawing temperature in the traditional device is controlled at a certain constant temperature, and is not consistent with the air temperature condition of the frozen soil which is subjected to periodic change along with time under natural conditions; in addition, the traditional test device blocks the external environment temperature by wrapping a layer of heat-insulating cotton, so that the traditional test device is troublesome to mount and dismount; finally, for monitoring the heat preservation effect of the frozen soil heat preservation roadbed, the field monitoring is adopted to obtain data in the prior art, and the required period is long.
Disclosure of Invention
The invention aims to provide a frozen soil freezing and thawing cycle process simulation device to solve the problem that multiple simulation experiments cannot be performed simultaneously in the prior art.
In order to solve the technical problem, the invention provides a frozen soil freezing and thawing cycle process simulation device, which comprises a transparent container, an upper cold bath tray, a lower cold bath tray, a water and soil partition plate, a cavity partition plate and a cold bath tank, wherein the upper cold bath tray is arranged on the transparent container; the upper cooling bath tray covers the top of the transparent container; the lower cooling bath tray covers the bottom of the transparent container; the water and soil partition plate is arranged in the transparent container, is detachably arranged on the lower cold bath tray, and forms a water storage cavity between the water and soil partition plate and the lower cold bath tray; the cavity separating partition plate is arranged in the transparent container, the cavity separating partition plate is detachably connected with the transparent container, and the cavity separating partition plate is used for vertically separating the interior of the transparent container into a plurality of experimental cavities; the cold bath with go up the cold bath and be connected with the cold bath is coiled down, the cold bath is used for regulating and control go up the cold bath with the temperature variation of cold bath under in the experimentation.
In one embodiment, the device further comprises a heat preservation room, the transparent container, the upper cold bath tray and the lower cold bath tray are all arranged in a space surrounded by the heat preservation room, and the heat preservation room is provided with an openable door.
In one embodiment, the transparent container is provided with a plurality of wire holes, the plurality of wire holes all penetrate through the side wall of the transparent container, and the plurality of wire holes are respectively communicated with the plurality of experiment cavities.
In one embodiment, the cold baths include a first cold bath and a second cold bath; the first cooling bath is connected and communicated with the upper cooling bath plate and is used for regulating and controlling the temperature change of the upper cooling bath plate in the experimental process; the second cooling bath is connected and conducted with the lower cooling bath tray, and the second cooling bath is used for regulating and controlling the temperature change of the lower cooling bath tray in the experimental process.
In one embodiment, the water and soil baffle plate comprises a pore plate and a plurality of supporting plates; the pore plate is provided with a plurality of water guide holes, the water guide holes are distributed on the surface of the pore plate, and the water guide holes penetrate through the pore plate; the water storage device is characterized in that a water guide groove is formed in the supporting plate, the water guide groove penetrates through the supporting plate, a plurality of supporting plates are arranged on the bottom surface of the pore plate in a separated mode and are supported on the lower cold bath tray, and therefore the water storage cavity is formed between the pore plate and the lower cold bath tray in a separated mode.
In one embodiment, a water injection hole is formed in the bottom of the lower cold bath tray, the water injection hole is connected and communicated with the water storage cavity, and the water injection hole is used for being connected with a water supplementing device.
In one embodiment, the transparent container is made of transparent magnetic glass, the cavity separating partition plate is made of a magnetic material, and the transparent container and the cavity separating partition plate are in magnetic attraction connection.
The invention has the following beneficial effects:
because divide the chamber baffle to locate in the transparent container, divide the chamber baffle with be detachable connection between the transparent container, divide the chamber baffle be used for with the inside vertical partition of transparent container is a plurality of experimental chambeies, so when using, can put into different experimental intracavity with the soil body of difference to this carries out synchronous experiment and compares, has solved the problem that prior art can't carry out multiple simulation experiment simultaneously conscientiously.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a structure provided by an embodiment of the present invention;
FIG. 2 is a schematic view of the insulated building of FIG. 1 in a disassembled state;
FIG. 3 is a schematic bottom view of the structure of FIG. 2;
FIG. 4 is a schematic view of the partial cross-sectional structure of FIG. 2;
fig. 5 is a schematic structural view of the soil-water separator of fig. 2.
The reference numbers are as follows:
10. a transparent container; 11. a water storage cavity; 12. a laboratory cavity; 13. a wire guide hole;
20. putting the bath tub on the upper part;
30. a lower cold bath tray; 31. a water injection hole;
40. a water and soil separator; 41. an orifice plate; 42. a support plate; 43. a water guide hole; 44. a water chute;
50. a cavity separation plate;
60. a cold bath; 61. a first cold bath; 62. a second cold bath;
70. a heat preservation room; 71. a door; 72. and (4) an observation window.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a frozen soil freeze-thaw cycle process simulation device, an embodiment of which is shown in fig. 1 to 5 and comprises a transparent container 10, an upper cold bath tray 20, a lower cold bath tray 30, a water and soil partition plate 40, a cavity partition plate 50 and a cold bath groove 60; the upper cold bath tray 20 covers the top of the transparent container 10; the lower cold bath tray 30 covers the bottom of the transparent container 10; the water and soil partition plate 40 is arranged in the transparent container 10, the water and soil partition plate 40 is detachably arranged on the lower cold bath tray 30, and a water storage cavity 11 is formed between the water and soil partition plate 40 and the lower cold bath tray 30; the cavity dividing partition plate 50 is arranged in the transparent container 10, the cavity dividing partition plate 50 is detachably connected with the transparent container 10, and the cavity dividing partition plate 50 is used for vertically dividing the interior of the transparent container 10 into a plurality of experiment cavities 12; the cold bath 60 is connected and communicated with the upper cold bath plate 20 and the lower cold bath plate 30, and the cold bath 60 is used for regulating and controlling the temperature change of the upper cold bath plate 20 and the lower cold bath plate 30 in the experimental process.
It should be noted that the chamber partition 50 may be divided into a plurality of experiment chambers 12 inside the transparent container 10, for example, the chamber partition 50 may be arranged in a cross shape to divide four experiment chambers 12 inside the transparent container 10, or the chamber partition 50 may be arranged in a herringbone shape to divide three experiment chambers 12 inside the transparent container 10, but for convenience of illustration, it is preferable to arrange two experiment chambers 12 in this embodiment.
During application, different soil samples and corresponding sensors can be placed in the two experiment cavities 12, the water storage cavity 11 is communicated with water replenishing equipment, then the temperature of the upper cooling bath tray 20 and the temperature of the lower cooling bath tray 30 can be regulated and controlled by the cooling bath 60 to simulate the required experiment environment, and after corresponding data are collected by monitoring equipment, the result of experiment comparison can be obtained.
Compared with the prior art, the two experiment cavities 12 are formed in the same container, so that two different experiments can be completed in the same environment, the experiment efficiency is improved, the consistency of the experiment environment is ensured, and the problem that multiple simulation experiments cannot be performed simultaneously in the prior art is solved practically.
Furthermore, since the cold bath 60 is used for regulating and controlling the temperature change of the upper cold bath 20 and the lower cold bath 30 in the experimental process, that is, the experimental temperature is not fixed or constant, the temperature regulation and control in the experimental process can be realized, thereby solving the problem that the prior art can only control the experimental temperature to be a constant value.
As shown in FIG. 1, the apparatus further comprises a thermal insulation room 70, wherein the transparent container 10, the upper cooling bath tray 20 and the lower cooling bath tray 30 are all arranged in the space surrounded by the thermal insulation room 70, and the thermal insulation room 70 is provided with an openable door 71.
After the heat preservation room 70 is arranged, the heat loss of the upper cooling bath tray 20 and the lower cooling bath tray 30 can be reduced, thereby providing important help for improving the accuracy of experimental comparison; in order to facilitate observation of the experimental process, observation windows 72 may be added to the insulated room 70 and the door 71 so that the experimenter can perform observation and recording at any time.
As shown in FIG. X, the transparent container 10 is provided with a plurality of wire holes 13, the plurality of wire holes 13 all penetrate through the side wall of the transparent container 10, and the plurality of wire holes 13 are respectively communicated with the plurality of experiment chambers 12.
After addding wire guide 13, the lead wire of sensor all can be concentrated through wire guide 13 and draw forth in every experiment chamber 12 to realized the normative management of experimentation, also provided important help for realizing the long-term steady operation of device.
As shown in fig. 1 and 2, the cold bath 60 includes a first cold bath 61 and a second cold bath 62; the first cooling bath 61 is connected and communicated with the upper cooling bath plate 20, and the first cooling bath 61 is used for regulating and controlling the temperature change of the upper cooling bath plate 20 in the experimental process; the second cooling bath 62 is connected and communicated with the lower cooling bath 30, and the second cooling bath 62 is used for regulating and controlling the temperature change of the lower cooling bath 30 in the experimental process.
That is, this embodiment achieves separate temperature control of the upper and lower cold plates 20, 30 using the first and second cold baths 61, 62, thereby facilitating the regulation of the upper and lower cold plates 20, 30 to various different temperatures to meet different experimental environmental regulations.
As shown in fig. 4 and 5, the soil-water separator 40 includes a perforated plate 41 and a plurality of support plates 42; the pore plate 41 is provided with a plurality of water guide holes 43, the plurality of water guide holes 43 are distributed at each part of the surface of the pore plate 41, and the plurality of water guide holes 43 penetrate through the pore plate 41; the supporting plate 42 is provided with a water chute 44, the water chute 44 penetrates through the supporting plate 42, the supporting plates 42 are arranged on the bottom surface of the pore plate 41 in a separated mode, and the supporting plates 42 are supported on the lower cooling bath tray 30, so that the water storage cavity 11 is formed between the interval where the pore plate 41 is separated from the lower cooling bath tray 30.
When the water storage device is applied, the water guide holes 43 are small in aperture, so that the soil sample cannot penetrate through the water guide holes 43, only the water in the soil sample can flow into the water storage cavity 11, or the water in the water storage cavity 11 can permeate into the soil sample; the plurality of support plates 42 are used for supporting the orifice plate 41, so that the orifice plate 41 and the lower cooling bath tray 30 can be separated from each other to form the water storage cavity 11, and the water guide groove 44 is used for ensuring that water circulation can be realized everywhere inside the water storage cavity 11.
As shown in fig. 3 and 4, the bottom of the lower cooling bath tray 30 is provided with a water injection hole 31, the water injection hole 31 is connected and communicated with the water storage cavity 11, and the water injection hole 31 is used for connecting a water supplement device.
When the water injection device is used, the water injection device can be connected and communicated with the water injection hole 31, and then water injection to the water storage cavity 11 and relevant monitoring to the inside of the water storage cavity 11 can be realized; wherein, the water replenishing device can be preferably a Ma's water replenishing bottle.
As shown in fig. 4, the transparent container 10 is made of transparent magnetic glass, the chamber-dividing partition 50 is made of magnetic material, and the transparent container 10 and the chamber-dividing partition 50 are magnetically connected.
Because the transparent container 10 is connected with the cavity dividing partition plate 50 in a magnetic attraction manner, the cavity dividing partition plate 50 can be assembled and disassembled very conveniently, and the size proportion of the two experimental cavities 12 can be adjusted more flexibly, so that more using requirements under different conditions are met.
For better explanation of the way of using the present invention, a specific application example is provided below, specifically as follows:
the first step is as follows: connecting the transparent container 10 and the lower cold bath tray 30
The cubic transparent container 10 with the upper and lower openings is aligned with the lower cold bath tray 30 according to the correct placement position, and the connecting bolts are screwed down, so that the transparent container 10 and the lower cold bath tray 30 form a whole.
The second step is that: installation water charging system
And inserting the water guide pipe into the transparent container 10 through a water injection hole 31 reserved in the lower cold bath tray 30, placing the water and soil partition plate 40, injecting water into the water storage cavity 11 through the Ma's water supplement bottle until the water surface reaches the bottom of the water and soil partition plate 40, and providing water supplement conditions for the test.
The third step: mounting of the chambered partition 50
The chamber partition 50 is inserted into the transparent container 10 along the wall slot of the transparent container 10, so that the transparent container 10 forms two independent experimental chambers 12 for the next control experiment.
The fourth step: put into a soil sample
Preparing soil samples according to a design scheme, loading soil into the two experimental cavities 12 in a grading manner, ensuring that the soil samples loaded into the two experimental cavities 12 are consistent each time, and burying temperature and humidity sensors at corresponding soil layer positions after loading soil to a preset position each time.
The fifth step: freezing the lower soil mass
In order to simulate the freezing state of the natural soil body, when the soil sample is loaded to a specified height, the temperature of the upper cooling bath tray 20 is adjusted to the set freezing temperature of the soil sample, so that the soil body begins to freeze until the soil body is completely frozen. The step is the freezing process of the traditional soil body freezing and thawing cycle test, and during the freezing process, the temperature and humidity change and the moisture migration condition in the soil body freezing process can be observed through the embedded temperature and humidity sensor.
And a sixth step: filler non-frozen soil layer
In order to simulate the earth surface shallow soil body which has strong reaction to the freeze-thaw action, after the lower soil body is completely frozen, the soil sample is continuously added to the upper part of the frozen soil body until the set height is reached.
The seventh step: filling soil for filling roadbed
After the shallow soil is filled, the roadbed filling is filled into the transparent container 10 and covers the upper part of the shallow soil.
Eighth step: laying high polymer heat-insulating layer
In the process of filling roadbed filling, when the sample is filled to a set height, a preformed high polymer heat insulation layer is laid in one experiment cavity 12 of the transparent container 10, and the other experiment cavity 12 is not processed, so that a contrast test is formed.
The ninth step: placing displacement sensor
And after the loading of all soil bodies is finished, mounting a displacement sensor at the top of the soil sample for monitoring displacement deformation in the test process.
The tenth step: is connected with the upper cold bath tray 20
After all the work in the transparent container 10 is completed, the cold bath tray 20 is connected to the transparent container 10 to control the temperature change of the freeze-thaw cycle.
The eleventh step: place insulated building 70
And finishing the connection and installation of all the components, and covering the prefabricated assembled heat preservation room 70 outside the transparent container 10 to isolate the influence of the surrounding environment on the temperature inside the transparent container 10.
The twelfth step: freezing and thawing cycle
And (3) carrying out temperature regulation and control on the cooling bath 60 connected with the cooling bath tray 20 according to a set freezing and thawing scheme, realizing high and low temperature control of periodic change, and carrying out freezing and thawing cycle tests on the soil sample.
The thirteenth step: data collection and analysis
After each freeze-thaw cycle is completed, extracting data of each sensor, recording temperature and humidity change conditions of the soil sample, internal water migration conditions of the soil sample and top displacement deformation conditions, and analyzing the heat preservation effect of the polyurethane high polymer heat preservation layer on the frozen soil roadbed.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. A frozen soil freezing and thawing cycle process simulation device is characterized in that,
comprises a transparent container, an upper cold bath tray, a lower cold bath tray, a water and soil partition, a cavity partition and a cold bath;
the upper cooling bath tray covers the top of the transparent container;
the lower cooling bath tray covers the bottom of the transparent container;
the water and soil partition plate is arranged in the transparent container, is detachably arranged on the lower cold bath tray, and forms a water storage cavity between the water and soil partition plate and the lower cold bath tray;
the cavity separating partition plate is arranged in the transparent container, the cavity separating partition plate is detachably connected with the transparent container, and the cavity separating partition plate is used for vertically separating the interior of the transparent container into a plurality of experimental cavities;
the cold bath with go up the cold bath and be connected with the cold bath is coiled down, the cold bath is used for regulating and control go up the cold bath with the temperature variation of cold bath under in the experimentation.
2. The apparatus of claim 1, further comprising a thermal insulation room, wherein the transparent container, the upper cold bath tray and the lower cold bath tray are all disposed in a space surrounded by the thermal insulation room, and the thermal insulation room is provided with an openable door.
3. The apparatus according to claim 1, wherein the transparent container is provided with a plurality of wire holes, the plurality of wire holes all penetrate through the side wall of the transparent container, and the plurality of wire holes are respectively communicated with the plurality of experiment cavities.
4. The apparatus of claim 1,
the cold bath comprises a first cold bath and a second cold bath;
the first cooling bath is connected and communicated with the upper cooling bath plate and is used for regulating and controlling the temperature change of the upper cooling bath plate in the experimental process;
the second cooling bath is connected and conducted with the lower cooling bath tray, and the second cooling bath is used for regulating and controlling the temperature change of the lower cooling bath tray in the experimental process.
5. The apparatus of claim 4,
the water and soil partition plate comprises a pore plate and a plurality of supporting plates;
the pore plate is provided with a plurality of water guide holes, the water guide holes are distributed on the surface of the pore plate, and the water guide holes penetrate through the pore plate;
the water storage device is characterized in that a water guide groove is formed in the supporting plate, the water guide groove penetrates through the supporting plate, a plurality of supporting plates are arranged on the bottom surface of the pore plate in a separated mode and are supported on the lower cold bath tray, and therefore the water storage cavity is formed between the pore plate and the lower cold bath tray in a separated mode.
6. The device of claim 1, wherein a water injection hole is formed in the bottom of the lower cold bath tray, the water injection hole is connected and communicated with the water storage cavity, and the water injection hole is used for being connected with a water supplementing device.
7. The device of claim 1, wherein the transparent container is made of transparent magnetic glass, the chamber-dividing partition is made of magnetic material, and the transparent container and the chamber-dividing partition are magnetically attracted and connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110704879.8A CN113447639A (en) | 2021-06-24 | 2021-06-24 | Frozen soil freeze-thaw cycle process simulation device |
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| CN202110704879.8A CN113447639A (en) | 2021-06-24 | 2021-06-24 | Frozen soil freeze-thaw cycle process simulation device |
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| CN115950910A (en) * | 2023-03-10 | 2023-04-11 | 湖南大学 | Tester for deformation characteristics of soil body under dry-wet or freeze-thaw cycle effect |
| CN116008333A (en) * | 2022-12-14 | 2023-04-25 | 哈尔滨师范大学 | Soil freeze thawing cycle experimental apparatus |
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| CN116008333A (en) * | 2022-12-14 | 2023-04-25 | 哈尔滨师范大学 | Soil freeze thawing cycle experimental apparatus |
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Application publication date: 20210928 |