CN112730802A - Experimental equipment and experimental method for artificially freezing water migration model - Google Patents
Experimental equipment and experimental method for artificially freezing water migration model Download PDFInfo
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- CN112730802A CN112730802A CN202011499643.7A CN202011499643A CN112730802A CN 112730802 A CN112730802 A CN 112730802A CN 202011499643 A CN202011499643 A CN 202011499643A CN 112730802 A CN112730802 A CN 112730802A
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- G01N33/24—Earth materials
- G01N33/246—Earth materials for water content
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
- G01N25/62—Investigating or analyzing materials by the use of thermal means by investigating moisture content by psychrometric means, e.g. wet-and-dry bulb thermometers
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Abstract
The invention discloses experimental equipment and an experimental method for an artificial freezing moisture migration model, wherein the experimental equipment comprises a loading device, a cold bath machine and a test box, the test box comprises a first cold bath plate, a first side plate, a second side plate and a plurality of second cold bath plates, the first cold bath plate, the first side plate, the second side plate and each second cold bath plate are used as side walls to form a cavity for placing a soil sample, and the first cold bath plate and the second cold bath plates are provided with temperature control solution channels; the loading device transmits force to the first cold bath plate through the axial force sensor; the experimental device comprises a moisture temperature sensor and a displacement sensor. The cold bath machine conveys the temperature control solution to the first cold bath board and each second cold bath board, the temperature of the temperature control solution is controlled, complex temperature boundary conditions are simulated, the first cold bath board applies pressure to the soil sample, and data of soil sample stress displacement change are obtained. The invention can be widely applied to the technical field of soil sample detection.
Description
Technical Field
The invention relates to the technical field of soil sample detection, in particular to experimental equipment and an experimental method for artificially freezing a water migration model.
Background
The best disposal scheme of the high-level waste at present is to store the high-level waste in a high-level waste disposal warehouse with the depth of 500-1000 m, and the radioactive waste safety management regulations stipulate that the safe isolation period of the high-level waste address disposal is not less than 1 ten thousand years. The nuclear waste leakage caused by natural or artificial disasters cannot be guaranteed in a long time span, so that the nuclide leakage is controlled in time by freezing the buffer backfill material layer by a freezing method.
Nuclear waste is radioactive and releases heat continuously during its decay, so the temperature boundary conditions in the freezing regime of a high level waste disposal depot are more complex than other freezing process construction regimes. At present, most of freezing experiments are unidirectional freezing or constant negative temperature integral freezing, a complex temperature boundary condition model experiment device is not seen yet, and particularly the experiment device relates to a nuclear waste disposal warehouse freezing model experiment.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present invention provides an experimental apparatus and an experimental method for artificially freezing a water migration model, which adopts the following technical scheme:
the experimental equipment for the artificial freezing water migration model comprises a loading device, a cold bath machine and a test box, wherein the test box comprises a first cold bath board, a first side board, a second side board and a plurality of second cold bath boards, the first cold bath board, the first side board, the second side board and each second cold bath board are used as the side walls of the test box to form a cavity for placing a soil sample in the test box, the first cold bath board is provided with a temperature control solution channel, the second cold bath board is provided with a temperature control solution channel, and the cold bath machine is used for conveying a temperature control solution to the temperature control solution channel; the first side plate is adjacent to the first cold bath plate, a plurality of first jacks are arranged on the first side plate, and the first jacks are distributed in an array manner; the second side plate is arranged opposite to the first side plate; the power source of the loading device transmits force to the first cold bath plate through the axial force sensor, and the first cold bath plate is used for compacting the soil sample; the experimental device comprises a moisture temperature sensor and a displacement sensor, wherein the moisture temperature sensor is used for being inserted into the first jack, and the displacement sensor is used for detecting the displacement of the first cold bath board.
In some embodiments of the invention, the first side panel is removable.
In some embodiments of the invention, the test chamber comprises a plurality of first mounting parts, and two opposite second cold bath boards are respectively provided with the first mounting parts, and the first mounting parts are used for mounting the first side plates.
In some embodiments of the present invention, the first mounting component includes a first fixing portion and a first fastening portion, the first fixing portion is used for fixing with the second cold bath board, and the first fastening portion is used for mounting with the first side board.
In some embodiments of the invention, an area for inserting the first side plate is formed between the inner side of the first clamping part and the side surface of the test box.
In some embodiments of the invention, the experimental apparatus comprises a data acquisition instrument for collecting data of the axial force sensor, the moisture temperature sensor and the displacement sensor.
The invention provides an experimental method for artificially freezing a water migration model, which comprises the steps of adding soil samples with prepared water contents into a test box in a layered mode, compacting in a layered mode, enabling the thickness of each compacted layer to be equal to the layer height of two adjacent layers of first jacks, inserting a water temperature sensor into each compacted layer of soil samples, arranging a first cold bath board on the soil samples, applying force to the first cold bath board through a loading device, inputting temperature control solutions into each temperature control solution channel through a cold bath machine, and collecting temperature and water content data of each measuring point, displacement data and axial force data of the first cold bath board.
The embodiment of the invention has at least the following beneficial effects: the temperature of the temperature control solution is controlled by conveying the temperature control solution to the first cold bath board and each second cold bath board so as to simulate complex temperature boundary conditions, and the first cold bath board applies pressure to the soil sample so as to obtain the data of the stress displacement change of the soil sample. The invention can be widely applied to the technical field of soil sample detection.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural view of an experimental apparatus showing a test chamber, a loading device, a cold bath machine and a data acquisition instrument;
FIG. 2 is a block diagram of a test chamber and loading device;
fig. 3 is a structural view of the first cold bath panel.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., are used in an orientation or positional relationship indicated based on the drawings, it is merely for convenience of description and simplicity of description, and it is not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore, is not to be considered as limiting the present invention. The features defined as "first" and "second" are used to distinguish feature names rather than having a special meaning, and further, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention relates to an experimental facility for artificially freezing a water migration model, which can be used for researching a temperature field and a water field of a soil body under a complex temperature boundary condition and monitoring the stress condition of the soil body in a one-dimensional direction in real time. Specifically, the experimental facility comprises a test box 100, the test box 100 comprises a first cold bath board 101, a first side board 102, a second side board 103 and a plurality of second cold bath boards 104, and the first cold bath board 101, the first side board 102, the second side board 103 and each second cold bath board 104 are used as side walls of the test box 100 to form a cavity for placing a soil sample in the test box 100.
Further, the first cold bath board 101 is provided with a temperature control solution channel 106, each second cold bath board 104 is provided with a temperature control solution channel 106, and the temperature control solution channels 106 are S-shaped, it can be understood that the experimental facility includes a cold bath machine 400, the cold bath machine 400 is used for conveying a temperature control solution to the temperature control solution channels 106, and the temperature control solution is set to be high temperature or low temperature, so as to achieve the purpose of controlling the boundary condition of the complex temperature.
Specifically, the first side plate 102 is disposed adjacent to the first cold bath plate 101, and the second side plate 103 is disposed opposite to the first side plate 102. With reference to the drawings, a first cold bath board 101 is disposed on the top of the test chamber 100, and serves as an upper cold bath board of the test chamber 100, a first side board 102 is disposed on the front side of the test chamber 100 and serves as a front cover board of the test chamber 100, a second side board 103 is disposed on the rear side of the test chamber 100 and serves as a rear cover board of the test chamber 100, the number of second cold bath boards 104 is set to three, three second cold bath boards 104 serve as a left cold bath board, a right cold bath board and a lower cold bath board of the test chamber 100 respectively, and the boundary temperature of the soil sample in four directions is controlled by the cold bath machine 400. Wherein, the left cold bath board and the right cold bath board are welded on the lower cold bath board, and the second side board 103 is welded with the left cold bath board, the right cold bath board and the lower cold bath board.
Further, the first cold bath 101 is movable, the first cold bath 101 is used for compacting the soil sample, and specifically, the experimental facility comprises a loading device 200, and the loading device 200 is used for transmitting force to the first cold bath 101 so as to control the stress displacement boundary condition of the soil sample in the vertical direction. The experimental facility comprises an axial force sensor, and the power source of the loading device 200 transmits force to the first cold bath plate 101 through the axial force sensor, so that the first cold bath plate 101 is pressed to the soil sample. Specifically, a backing plate 203 is arranged on the first cold bath plate 101, a power source of the loading device 200 is set as a servo oil cylinder 202, and the servo oil cylinder 202 transmits force to the backing plate 203 through an axial force sensor, so that the force application is uniform.
Referring to the drawings, the loading device 200 comprises a bracket, the test chamber 100 is arranged on the bracket, and the servo cylinder 202 is arranged above the test chamber 100. Specifically, the support includes base 205, crossbeam 206 and two stands 204, and the lower extreme setting of stand 204 is on base 205, and the upper end and the crossbeam 206 installation of stand 204 are provided with the threaded connection spare that is used for installing stand 204 on crossbeam 206, and the threaded connection spare sets up to the nut, and servo cylinder 202 sets up on crossbeam 206, and proof box 100 sets up on base 205, and the cold bath board welds on base 205 down.
Further, the experimental facility includes a displacement sensor 201, the displacement sensor 201 is provided to detect a displacement of the first cold bath panel 101, and a lower end of the displacement sensor 201 is in contact with the first cold bath panel 101. The displacement sensor 201 is arranged on the loading device 200 via a first connecting plate, or the displacement sensor 201 is arranged on the cross beam 206 via a first connecting plate.
The experimental equipment comprises a moisture temperature sensor to monitor the change process of a moisture field and a temperature field in the soil sample in the experimental process. Specifically, the first side plate 102 is provided with a plurality of first insertion holes, the moisture temperature sensor is used for being inserted into the first insertion holes, the first insertion holes are distributed in an array, and the first cold bath plate 101 moves along the row direction or the column direction of the first insertion holes when pressing a soil sample. It can be understood that, in the case that the first cold bath 101 moves along the column direction of the first insertion holes, the first cold bath 101 compacts the soil samples in layers, the thickness of each layer of the soil sample is consistent with the line spacing between two adjacent rows of the first insertion holes, and when each layer of the soil sample is compacted, the moisture temperature sensor is inserted into the first insertion hole of the layer, and then the soil sample is added into the test box 100, and the compaction is continued.
Further, the experimental facility comprises a data acquisition instrument 300, and the data acquisition instrument 300 is used for collecting data of the axial force sensor, the displacement sensor 201 and the moisture temperature sensor so as to obtain the pressure value of the first cold bath plate 101, the displacement value of the first cold bath plate 101, and the temperature and water content data of each measuring point.
The first side plate 102 is detachable, and the first side plate 102 is provided with a handle, so that the first side plate 102 can be conveniently detached. Referring to the drawings, the test chamber 100 includes a plurality of first mounting parts 105, and specifically, the first mounting parts 105 are respectively disposed on two opposite second cold bath plates 104, and the first mounting parts 105 are used for mounting the first side plate 102. Further, the first mounting part 105 is a sheet metal part and is of an L-shaped structure, the first mounting part 105 is arranged on the second cold bath board 104 in a welding manner, the first mounting part 105 includes a first fixing part and a first clamping part, the first fixing part is used for being fixed with the second cold bath board 104, and the first clamping part is used for being mounted with the first side board 102. With reference to the drawings, an area into which the first side plate 102 is inserted is formed between the inner side of the first clamping portion and the side surface of the test box 100, the inner side is the direction toward the cavity of the test box 100, and the thickness of the area is equal to the thickness of the first side plate 102. Specifically, two first mounting parts 105 are arranged on the left cold bath plate, two first mounting parts 105 are arranged on the right cold bath plate, the first clamping portion is located on the front side of the test box 100, the first side plate 102 is inserted between the front side of the test box 100 and the first clamping portion, and the first clamping portion fixes the first side plate 102 through bolts. The first side plate 102 is provided with a bolt hole, the bolt is in threaded connection with the first side plate 102, or the bolt is arranged on the first clamping part through threaded connection, and the end of the bolt abuts against the outer side of the first side plate 102.
The invention relates to an experimental method for artificially freezing a water migration model, which specifically comprises the following steps: assembling the first side plate 102; adding the soil samples with the prepared water contents into the test box 100 in a layered mode, and compacting in a layered mode, wherein the thickness of each compacted layer is equal to the layer height of two adjacent first jacks, and a water temperature sensor is inserted into each compacted layer of soil sample; arranging the first cold bath plate 101 on the soil sample, applying force to the first cold bath plate 101 by the loading device 200, and controlling the loading device 200 by stress or strain; the cold bath machine 400 inputs temperature control solution to each temperature control solution channel 106; data of temperature and water content at each measuring point, and displacement data and axial force data of the first cold bath panel 101 are collected.
The experimental equipment and the experimental method can be used for carrying out model tests under complex temperature boundary conditions, and the temperature field and moisture field change conditions of the side surface and the bottom surface of the high-level waste storage tank are simulated by selecting different boundary temperature combinations. The loading device 200 can monitor the vertical displacement and stress condition of the model sample in real time. Besides the treatment reservoir buffer layer freezing simulation, the simulation research can also be carried out on the roadbed or the building foundation frost heaving and thawing sinking.
In the description herein, references to the terms "one embodiment," "some examples," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like, if any, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (7)
1. The utility model provides an experimental facilities of artifical freezing moisture migration model which characterized in that: comprises a loading device (200), a cold bath machine (400) and a test box (100), wherein the test box (100) comprises
The device comprises a first cold bath plate (101), wherein a power source of a loading device (200) transmits force to the first cold bath plate (101) through an axial force sensor, the first cold bath plate (101) is used for compacting a soil sample, the first cold bath plate (101) is provided with a temperature control solution channel (106), and a cold bath machine (400) is used for conveying a temperature control solution to the temperature control solution channel (106);
the first side plate (102), the first side plate (102) and the first cold bath plate (101) are arranged adjacently, a plurality of first jacks are arranged on the first side plate (102), and the first jacks are distributed in an array;
a second side plate (103), the second side plate (103) being disposed opposite the first side plate (102);
the first cold bath board (101), the first side board (102), the second side board (103) and each second cold bath board (104) are used as the side wall of the test box (100) to form a cavity of the test box (100) for placing a soil sample, the second cold bath board (104) is provided with a temperature control solution channel (106), and the cold bath machine (400) is used for conveying a temperature control solution to the temperature control solution channel (106);
wherein, experimental facilities include moisture temperature sensor and displacement sensor (201), moisture temperature sensor is used for inserting first jack, displacement sensor (201) are used for detecting the displacement of first cold bath board (101).
2. The experimental facility for artificially freezing a water migration model according to claim 1, characterized in that: the first side plate (102) is detachable.
3. The experimental facility for artificially freezing a water migration model according to claim 2, characterized in that: the test box (100) comprises a plurality of first mounting parts (105), the first mounting parts (105) are respectively arranged on two opposite second cold bath plates (104), and the first mounting parts (105) are used for mounting the first side plate (102).
4. The experimental facility for artificially freezing a water migration model according to claim 3, wherein: the first mounting component (105) comprises a first fixing part and a first clamping part, the first fixing part is used for being fixed with the second cold bath board (104), and the first clamping part is used for being mounted with the first side board (102).
5. The experimental facility for artificially freezing a water migration model according to claim 4, wherein: an area for inserting the first side plate (102) is formed between the inner side of the first clamping part and the side surface of the test box (100).
6. The experimental facility for artificially freezing a water migration model according to any one of claims 1 to 5, characterized in that: the experimental equipment comprises a data acquisition instrument (300), wherein the data acquisition instrument (300) is used for collecting data of the axial force sensor, the moisture temperature sensor and the displacement sensor (201).
7. An experimental method for artificially freezing a water migration model is characterized in that: adding the soil sample with the prepared water content into a test box (100) in a layered mode, compacting in a layered mode, wherein the thickness of each compacted layer is equal to the layer height of two adjacent layers of first jacks, inserting a water temperature sensor into each compacted layer of soil sample, arranging a first cold bath board (101) on the soil sample, applying force to the first cold bath board (101) through a loading device (200), inputting temperature control solution into each temperature control solution channel (106) through a cold bath machine (400), collecting temperature and water content data of each measuring point, and displacement data and axial force data of the first cold bath board (101).
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| CN202011499643.7A CN112730802A (en) | 2020-12-18 | 2020-12-18 | Experimental equipment and experimental method for artificially freezing water migration model |
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| CN202011499643.7A CN112730802A (en) | 2020-12-18 | 2020-12-18 | Experimental equipment and experimental method for artificially freezing water migration model |
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Cited By (1)
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| CN114755393A (en) * | 2022-04-29 | 2022-07-15 | 内蒙古师范大学 | Simulation device for migration and diffusion of micro plastic in soil |
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