Geocell pull-out test device and test method under freeze-thaw cycle

Abstract

The invention relates to the technical field of frozen soil mechanical tests, in particular to an earthwork standard room pull-out test device under freezing and thawing cycles and a test method. The constant-temperature water circulation assembly is arranged on the support base; the constant-temperature water circulation assembly is arranged on the support base, the freeze-thaw circulation assembly is arranged on the support base, the freeze-thaw circulation assembly is communicated with the constant-temperature water circulation assembly, and a material box is installed in the freeze-thaw circulation assembly; the normal pressure test assembly is located on the upper side of the material box, and the pressure test end of the normal pressure test assembly faces the material box; and the geocell fixing assembly is installed on a drawing assembly, and the drawing assembly is installed on the side wall of the freezing and thawing circulation assembly. According to the invention, it is convenient to simulate that the geocell is under different freeze-thaw cycle conditions, and the accuracy of the geocell test is improved.

Description

Technical Field

[0001] The invention relates to the technical field of frozen soil mechanics testing, and in particular to a geocell pull-out testing device and a testing method under freeze-thaw cycles. Background Art

[0002] Geocell is a geosynthetic material used to reinforce soil. It has good tensile strength and durability and is often used in infrastructure construction such as roads, railways, and dams to enhance the stability and bearing capacity of the soil. The impact of freeze-thaw cycles on geostructures is a key issue, especially in infrastructure construction in cold regions. In these areas, seasonal freeze-thaw processes can lead to changes in soil volume, which can negatively affect the performance and stability of geostructures such as geocells. Traditional geotechnical materials may become loose, deformed, or damaged in freeze-thaw environments, which not only affects the safety and reliability of the project, but also increases maintenance costs and frequency. In order to address these issues, the scientific and engineering communities have begun to focus on improving the freeze-thaw resistance of geocells.

[0003] Freeze-thaw cycle refers to the process in which water in the soil freezes and melts repeatedly during temperature changes. The impact of this process on geogrids is mainly manifested in:

[0004] 1) Physical damage: freeze-thaw cycles lead to changes in soil structure, which may cause soil volume expansion and contraction, thereby generating certain shear stress and tensile stress on the geocells embedded in the soil;

[0005] 2) Material aging: Repeated freeze-thaw cycles will accelerate the aging of geocell materials and reduce their tensile strength and durability.

[0006] The pull-out performance of a geocell refers to the amount of tension it can withstand in the soil and the interfacial friction with the surrounding soil. This is an important indicator for evaluating the reinforcement effect of geocells. Under the action of freeze-thaw cycles, the pull-out performance of geocells may change significantly, so special research and testing are needed to ensure project safety.

[0007] For example, the prior application with publication number CN113945458A discloses a multifunctional geogrid pull-out test device and a method of use, including a test device bracket, a pull-out device assembly, a pressure device assembly, a soil box and a geogrid. However, the test is carried out at room temperature and cannot simulate the changes of the geogrid under freeze-thaw cycles. By simulating different numbers of freeze-thaw cycles under laboratory conditions, a pull-out test is carried out to measure the pull-out force and interface friction coefficient of the geocell. For example, the geocell is buried in soil samples of different densities, freeze-thaw cycles are carried out under specific temperature conditions, and the performance changes after each cycle are measured. Monitoring points are arranged in the actual engineering environment, and the long-term performance of the geocell under natural freeze-thaw conditions is tracked and tested to obtain data that is closer to actual applications. In combination with experimental and theoretical research results, relevant design standards and construction specifications are formulated and modified to guide the application of geocells in freeze-thaw environments.

[0008] The climate conditions in Xinjiang are complex and changeable, with cold and long winters and warm and dry summers. This extreme seasonal change leads to significant freeze-thaw cycles, posing severe challenges to engineering construction. During the freeze-thaw cycle, the repeated changes in soil volume will have a significant impact on the geogrid buried therein, causing the bond between it and the soil to weaken, thereby affecting the stability and safety of the entire engineering structure. Geocells are widely used in highway, railway, water conservancy and other projects in Xinjiang to strengthen foundations, control soil erosion and improve the bearing capacity of the overall structure. The frozen soil pull-out test device in the prior art has a complex structure, cumbersome operation, and it is difficult to simulate freeze-thaw cycle conditions, resulting in large errors in the test data.

[0009] Therefore, those skilled in the art are committed to developing a geocell pull-out test device and test method under freeze-thaw cycles to facilitate simulating geocells under different freeze-thaw cycle conditions and improve the accuracy of geocell tests. Summary of the invention

[0010] The technical problem to be solved by the present invention is to provide a geocell pull-out test device and a test method under freeze-thaw cycles, which are convenient for simulating geocells under different freeze-thaw cycle conditions and improving the accuracy of geocell tests.

[0011] The technical solution of the present invention to solve the above technical problems is as follows:

[0012] A geocell pull-out test device under freeze-thaw cycles, characterized in that:

[0013] Bracket base;

[0014] A constant temperature water circulation component, wherein the constant temperature water circulation component is arranged on the support base;

[0015] A freeze-thaw cycle component, which is arranged on the support base and communicates with the constant temperature water circulation component, and a material box is installed in the freeze-thaw cycle component;

[0016] A normal pressure test assembly, the normal pressure test assembly is located on the upper side of the material box, and the pressure test end of the normal pressure test assembly faces the material box;

[0017] A geocell fixing assembly is installed on a pulling assembly, and the pulling assembly is installed on the side wall of the freeze-thaw cycle assembly. One end of the geocell fixing assembly is connected to the geocell, and the other end of the geocell is located in the material box.

[0018] The beneficial effects of adopting the above scheme are: the freeze-thaw cycle component and the constant temperature water circulation component are used to simulate the repeated freezing and thawing of the soil in the construction area, and the geocell is tested using the pull-out component and the normal pressure test component to understand the specific impact mode of the freeze-thaw cycle on the soil and the grid, especially the temperature fluctuations during the freeze-thaw cycle. After different freeze-thaw cycles, the geocell equipped with the pull-out device is tested to evaluate its pull-out resistance, analyze the regulating effect of the temperature controller on the soil temperature change, and evaluate its impact on the performance of the geocell.

[0019] Based on the above technical solution, the present invention can also be improved as follows.

[0020] Furthermore, the constant temperature water circulation component includes a constant temperature water tank, and the constant temperature water tank is connected to the freeze-thaw cycle component through a connecting pipe.

[0021] The beneficial effect of adopting the above further solution is that the temperature of the circulating water is controlled by a constant temperature water tank, which is conducive to conducting tests at different temperatures.

[0022] Furthermore, the freeze-thaw cycle assembly includes a freeze-thaw box, which is connected to the constant temperature water tank through the connecting pipe, the material box is installed in the freeze-thaw box, and the freeze-thaw box has a through hole for the geocell to pass through.

[0023] The beneficial effect of adopting the above further solution is that the freeze-thaw box facilitates keeping the material box at a suitable temperature.

[0024] Furthermore, the material box has a material bin, a loading plate is arranged at the upper end of the material bin, and the material box has a through hole for the geocell to pass through.

[0025] The beneficial effect of adopting the above further solution is that the loading plate facilitates the normal force to act evenly on the test article in the material box.

[0026] Furthermore, the normal pressure test assembly includes a gantry and a first jack, the first jack is installed on the gantry, and an output end of the first jack faces the loading plate.

[0027] The beneficial effect of adopting the above further solution is that the first jack is used to provide normal test pressure.

[0028] Furthermore, the geocell fixing assembly includes an inner clamping plate and an outer clamping plate, the inner clamping plate and the outer clamping plate are vertically arranged, and the inner clamping plate and the outer clamping plate are both installed in the pulling assembly.

[0029] The beneficial effect of adopting the above further solution is that the fixing cavity formed by the inner clamping plate and the outer clamping plate is conducive to fixing the geocell.

[0030] Furthermore, the pulling assembly includes a pulling frame, which has a pulling cavity, in which the inner clamp and the outer clamp are installed, and the outer clamp is connected to the output end of the second jack through a displacement meter and a reaction force pulling rod, and a force sensor is also installed between the reaction force pulling rod and the output end of the second jack, and the second jack is installed on the pulling frame.

[0031] The beneficial effect of adopting the above further solution is that data is continuously collected through the force sensor and the displacement meter to facilitate further analysis.

[0032] Furthermore, a compressor and a condenser are installed in the freeze-thaw box, the output end of the compressor is connected to the condenser and the evaporation tube in sequence, the other end of the evaporation tube extends to the outer wall of the material box and then connected to the input end of the compressor, and the connecting pipe is connected to the condenser;

[0033] The outer wall of the material box is also equipped with a plurality of ultrasonic generating devices, and the ultrasonic generating devices are electrically connected to the control device.

[0034] The beneficial effect of adopting the above further scheme is that the material box is located on the inner wall of the freeze-thaw box. During the freeze-thaw process, the soil in the material box close to the inner wall of the freeze-thaw box first forms frozen soil, and the soil near the middle of the material box forms frozen soil later. During this process, a large temperature difference will appear in the material box, uneven freezing will occur, the soil will expand unevenly, and the moisture in the soil will migrate, which will lead to large errors in the subsequent geocell pull-out test.

[0035] The compressor compresses the refrigerant and exchanges heat with the constant temperature water tank through the condenser, and then freezes or heats the material box to melt. This process is similar to an air conditioning device, which realizes cooling and heating in the freeze-thaw box. In order to make the soil in the material box freeze evenly, multiple ultrasonic generators are evenly installed on the outer wall of the material box. During the freeze-thaw process, the ultrasonic device generates ultrasonic waves of a certain frequency, which causes cavitation in the soil. After the bubbles burst, the freezing point of the water in the soil is changed, so that the supercooling of the water in the soil is increased, thereby improving the freezing efficiency of the middle soil in the material box and ensuring that the freezing rate of the soil in each part of the material box is uniform. Although ultrasonic waves will produce certain mechanical and thermal effects, the ultrasonic cavitation effect at a specific frequency is more obvious, and the mechanical effect is conducive to the formation of smaller and more evenly distributed ice crystals, promoting the formation of ice crystal nuclei and accelerating the freezing efficiency. During the melting of frozen soil, when the evaporation pipe releases heat into the material box, the ultrasonic generator generates ultrasonic waves of another frequency, amplifying the mechanical and thermal effects of the ultrasonic waves. The ultrasonic waves alternate between positive and negative pressures through the cavitation effect, generating huge negative pressure on the surface of the frozen soil, leading to the formation of microbubbles. The bubbles burst when the pressure suddenly drops. The bubble bursting caused by the ultrasonic wave can enhance heat transfer and help heat transfer more smoothly, so that the frozen soil in the material box is evenly heated and melted at all locations.

[0036] A geocell pull-out test method under freeze-thaw cycles is applied to the geocell pull-out test device under freeze-thaw cycles as described above, and comprises the following steps:

[0037] S100. Soil sample preparation: Collect sufficient soil samples, process and screen them according to the experimental requirements, and weigh the soil samples using an electronic scale to ensure that the quality of each test sample is uniform;

[0038] Place soil samples at the bottom of the material box, use a vibrator or manually compact to the designed compaction degree, then place the geocell, fill the soil over the geocell and compact the soil so that the geocell wraps the soil and the end of the geocell extends out of the material box through the through hole. Fill the upper layer of the material box and compact it in the same way as the lower pull box, ensuring that the soil is filled evenly and fully during the process;

[0039] S200. Test preparation: The geocell is placed in the fixed cavity formed by the inner and outer clamping plates and fixed with nuts. Then, the constant temperature water circulation assembly is turned on, the required water temperature is set, and the temperature sensor is ensured to be consistent with the water tank temperature. The displacement meter is installed at the outer clamping plate to ensure that the value is zero at the beginning of the test.

[0040] S300. Test process: Provide the required normal pressure through the first jack on the gantry, ensuring that it is applied in the exact center of the loading plate, and then use the second jack to provide the tension required for the reaction force to pull the pull rod, which can be measured by a force sensor;

[0041] As the pulling progresses, the displacement begins to change, and when it reaches the required displacement for the test, the data is recorded and processed.

[0042] The beneficial effect of adopting the above further scheme is: through normal pressure and pull-out tests, the accuracy of geocell pull-out tests under freeze-thaw cycles is improved.

[0043] Furthermore, the data recording and processing in step S300 includes real-time acquisition and timed acquisition, and parameters are adjusted in real time for multiple times.

[0044] The beneficial effect of adopting the above further solution is: improving the accuracy of test data through real-time data and scheduled data. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the front view structure of a geocell pull-out test device under freeze-thaw cycles according to a specific embodiment of the present invention;

[0046] Figure 2 It is a structural schematic diagram of a geocell pull-out test device under freeze-thaw cycles according to a specific embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the structure of a normal pressure test assembly according to a specific embodiment of the present invention;

[0048] Figure 4 The figure is a schematic diagram of the freeze-thaw box structure according to a specific embodiment of the present invention.

[0049] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0050] 1. Constant temperature water tank; 2. Bracket base; 3. Connecting pipe; 4. Freeze-thaw box; 5. Normal pressure test assembly; 6. Pull assembly; 7. Second jack; 8. Constant temperature water circulation assembly; 9. Freeze-thaw cycle assembly; 10. Geocell fixing assembly; 101. Gantry; 102. Material box; 103. Loading plate; 104. First jack; 105. Inner clamp; 106. Outer clamp; 107. Displacement meter; 108. Force sensor; 109. Pull frame; 110. Reaction pull rod; 11. Compressor; 12. Condenser; 13. Evaporation tube; 14. Ultrasonic generator. DETAILED DESCRIPTION

[0051] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0052] In the description of the present invention, it is necessary to understand that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred system or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0053] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Embodiment 1

[0056] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a geocell tensile test device under freeze-thaw cycles includes:

[0057] The support base 2 is made of high-strength material and is used to support the test device;

[0058] A constant temperature water circulation component 8, which is arranged on the support base 2;

[0059] A freeze-thaw cycle component 9, which is disposed on the support base 2 and communicates with the constant temperature water circulation component 8. A material box 102 is installed in the freeze-thaw cycle component 9;

[0060] A normal pressure test assembly 5, the normal pressure test assembly 5 is located on the upper side of the material box 102, and the pressure test end of the normal pressure test assembly 5 faces the material box 102;

[0061] The geocell fixing assembly 10 is installed on the pulling assembly 6 , and the pulling assembly 6 is installed on the side wall of the freeze-thaw cycle assembly 9 . One end of the geocell fixing assembly 10 is connected to the geocell, and the other end of the geocell is located in the material box 102 .

[0062] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, the constant temperature water circulation component 8 includes a constant temperature water tank 1. The interior of the constant temperature water tank 1 is made of steel, and the exterior is bonded with insulation material to ensure accurate temperature. The constant temperature water tank 1 is connected to the freeze-thaw cycle component 9 through a connecting pipe 3.

[0063] The freeze-thaw cycle component 9 includes a freeze-thaw box 4, which uses an external insulation material and an internal material with a low specific heat capacity to conduct heat. The freeze-thaw box 4 and the material box 102 use materials with a low specific heat capacity to improve the temperature conduction efficiency. The freeze-thaw box 4 is connected to the constant temperature water tank 1 through a connecting pipe 3, and the connecting pipe 3 can be a hose. The material box 102 is installed in the freeze-thaw box 4.

[0064] The material box 102 has a material bin, and a loading plate 103 is arranged on the upper end of the material bin. The loading plate 103 can be made of a 1 cm thick steel plate to withstand the normal force of the normal pressure test assembly 5. The side walls of the freeze-thaw box 47 and the side walls of the material box 102 both have through holes for the geocell to pass through.

[0065] like Figure 1 , Figure 3 As shown, in another embodiment, the normal pressure test assembly 5 includes a gantry 101 and a first jack 104 . The first jack 104 is installed on the gantry 101 , and the output end of the first jack 104 faces the loading plate 103 .

[0066] The geocell fixing assembly 10 includes an inner clamping plate 105 and an outer clamping plate 106 . The inner clamping plate 105 and the outer clamping plate 106 are vertically arranged, and both the inner clamping plate 105 and the outer clamping plate 106 are installed in the pulling assembly 6 .

[0067] The drawing assembly 6 includes a drawing frame 109, which has a drawing cavity. The inner clamp 105 and the outer clamp 106 are installed in the drawing cavity. The outer clamp 106 is connected to the output end of the second jack 7 through a displacement meter 107 and a reaction force pulling rod 110. A force sensor 108 is also installed between the reaction force pulling rod 110 and the output end of the second jack 7. The second jack 7 is installed on the drawing frame 109.

[0068] In this embodiment, the temperature and time of freezing and thawing are changed by a temperature controller (not shown in the figure), and the geocell is tested by using the pulling device 6. The temperature data is continuously collected and analyzed by the data acquisition system to understand the specific impact mode of the freezing and thawing cycle on the soil and the grid. The temperature sensors (not shown in the figure) arranged around the geocell are used to monitor the soil temperature changes in real time, especially the temperature fluctuations during the freezing and thawing cycle. After different freezing and thawing cycles, the geocell equipped with the optimized pulling device 6 is subjected to a pulling test to evaluate its anti-pulling performance. The regulating effect of the temperature controller on the soil temperature change is analyzed, and its influence on the performance of the geocell is evaluated.

[0069] like Figure 1 , Figure 2 and Figure 4 As shown, during the experiment, the constant temperature water in the constant temperature water tank 1 keeps the soil in the material box 102 at a constant temperature. When further freeze-thaw experiments are required, the soil in the material box 102 needs to be quickly frozen or thawed. In order to quickly freeze or thaw the soil in the material box 102, a compressor 11 and a condenser 12 are installed in the freeze-thaw box 4. The output end of the compressor 11 is connected to the condenser 12 and the evaporation tube 13 in sequence. The other end of the evaporation tube 13 extends to the outer wall of the material box 102 and is then connected to the input end of the compressor 11. The connecting pipe 3 is connected to the condenser 12. A plurality of ultrasonic generators 14 are also installed on the outer wall of the material box 102, and the ultrasonic generators 14 are electrically connected to the control device. The compressor 11, the condenser, and the evaporation tube 13 form a device with a working principle similar to that of an air conditioner to freeze or melt the soil in the material box. In order to accelerate the freezing or melting and make the soil in the material box 102 freeze more evenly, an ultrasonic generator 14 is installed on the outer wall of the material box 102. The control device (not shown in the figure) controls the ultrasonic generator 14 to generate ultrasonic waves of different frequencies, and cooperates with the evaporation tube 13 to achieve rapid and uniform freezing or melting of the soil in the material box 102, thereby improving the accuracy of the geocell pull-out test under freeze-thaw cycles.

[0070] Embodiment 2

[0071] This embodiment also provides a geocell pull-out test method under freeze-thaw cycles, which is applied to the geocell pull-out test device under freeze-thaw cycles as described above, and includes the following steps:

[0072] S100. Soil sample preparation: Collect sufficient soil samples, process and screen them according to the experimental requirements, and weigh the soil samples using an electronic scale to ensure that the quality of each test sample is uniform;

[0073] Place soil samples in the lower layer of the material box 102, use a vibrator or manually compact to the designed compaction degree, and then place the geocell. To ensure that the geocell plays the maximum role, you can first use an iron rod to fix it, and then fill the soil to exceed the geocell by 10 cm to compact the soil. Fill the soil beyond the geocell and compact the soil so that the geocell wraps the soil, and the end of the geocell extends out of the material box 102 through the through hole. The filling and compaction of the upper layer of the material box 102 is consistent with the operation of the lower pull box. During the process, ensure that the soil is filled evenly and fully;

[0074] S200. Test preparation: The geocell is placed in the fixed cavity formed by the inner clamping plate 105 and the outer clamping plate 106 and fixed with nuts, then the constant temperature water circulation component 8 is turned on, the required water temperature is set, and the temperature sensor is ensured to be consistent with the water tank temperature. The displacement meter 107 is installed at the outer clamping plate 106 to ensure that the value is zero at the beginning of the test.

[0075] Specifically, remove the nut between the inner clamping plate 105 and the outer clamping plate 106, connect the geocell to the inner clamping plate 105 and the outer clamping plate 106, and then fix and clamp with nuts to ensure that they will not come off during the pulling process. Then turn on the constant temperature water tank 1, set the required water temperature, turn on the water circulation system, ensure that the temperature sensor is consistent with the water tank temperature, install the displacement meter 107 at the outer clamp 6, and ensure that the value is zero at the beginning of the test.

[0076] S300. Test process: First, the first jack 104 on the gantry 101 provides the required normal pressure to ensure that it is applied to the center of the loading plate 103, and then the first jack 104 is used to provide the required pulling force of the reaction force pulling rod 110, and the value can be measured by the force sensor 108. As the pulling progresses, the displacement begins to change, and the experiment ends when the required displacement is reached.

[0077] Data recording and monitoring: Use a computer data acquisition system to record various data during the test, including real-time and timed acquisition, and regularly check the operating status of sensors and instruments to ensure the accuracy and reliability of data recording. Monitor the operation of the test device in real time and adjust parameters in time to ensure the stability of the test.

[0078] End of test and data processing: When the test endpoint or experimental purpose is reached, stop the operation of the test device. Export the test data to the computer and perform data processing and analysis, including data cleaning, curve fitting, statistical analysis, etc.

[0079] Write an experimental report: including experimental design, methods, results and conclusions.

[0080] Cleaning and maintenance: Remove the soil sample from the shear box, clean the test device, and ensure that the equipment is clean and tidy. Regularly inspect and maintain the test device, including sensor calibration, equipment debugging, parts replacement, etc.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A geocell pull-out test device under freeze-thaw cycles, characterized in that: include Bracket base (2); A constant temperature water circulation component (8), wherein the constant temperature water circulation component (8) is arranged on the support base (2); A freeze-thaw cycle component (9), wherein the freeze-thaw cycle component (9) is arranged on the support base (2), and the freeze-thaw cycle component (9) is in communication with the constant temperature water circulation component (8), and a material box (102) is installed in the freeze-thaw cycle component (9); A normal pressure test assembly (5), the normal pressure test assembly (5) being located on the upper side of the material box (102), and the pressure test end of the normal pressure test assembly (5) facing the material box (102); A geocell fixing assembly (10), wherein the geocell fixing assembly (10) is mounted on a pulling assembly (6), wherein the pulling assembly (6) is mounted on a side wall of the freeze-thaw cycle assembly (9), wherein one end of the geocell fixing assembly (10) is connected to the geocell, and the other end of the geocell is located in the material box (102).

2. The geocell pull-out test device under freeze-thaw cycles according to claim 1, characterized in that: The constant temperature water circulation component (8) comprises a constant temperature water tank (1), and the constant temperature water tank (1) is connected to the freeze-thaw circulation component (9) via a connecting pipe (3).

3. The geocell pull-out test device under freeze-thaw cycles according to claim 2, characterized in that: The freeze-thaw cycle assembly (9) comprises a freeze-thaw box (4), the freeze-thaw box (4) is connected to the constant temperature water tank (1) through the connecting pipe (3), the material box (102) is installed in the freeze-thaw box (4), and the freeze-thaw box (4) has a through hole for the geocell to pass through.

4. The geocell pull-out test device under freeze-thaw cycles according to claim 1, characterized in that: The material box (102) has a material bin, a loading plate (103) is arranged at the upper end of the material bin, and the material box (102) has a through hole for the geocell to pass through.

5. The geocell pull-out test device under freeze-thaw cycles according to claim 4, characterized in that: The normal pressure test assembly (5) comprises a gantry (101) and a first jack (104); the first jack (104) is mounted on the gantry (101), and an output end of the first jack (104) faces the loading plate (103).

6. The geocell pull-out test device under freeze-thaw cycles according to claim 1, characterized in that: The geocell fixing assembly (10) comprises an inner clamping plate (105) and an outer clamping plate (106), wherein the inner clamping plate (105) and the outer clamping plate (106) are arranged vertically, and the inner clamping plate (105) and the outer clamping plate (106) are both installed in the pulling assembly (6).

7. The geocell pull-out test device under freeze-thaw cycles according to claim 6, characterized in that: The drawing assembly (6) comprises a drawing frame (109), wherein the drawing frame (109) has a drawing cavity, wherein the inner clamping plate (105) and the outer clamping plate (106) are installed in the drawing cavity, wherein the outer clamping plate (106) is connected to the output end of the second jack (7) via a displacement meter (107) and a reaction force pulling rod (110), wherein a force sensor (108) is also installed between the reaction force pulling rod (110) and the output end of the second jack (7), and the second jack (7) is installed on the drawing frame (109).

8. The geocell pull-out test device under freeze-thaw cycles according to claim 3, characterized in that: A compressor (11) and a condenser (12) are installed in the freeze-thaw box (4); the output end of the compressor (11) is connected to the condenser (12) and the evaporation tube (13) in sequence; the other end of the evaporation tube (13) extends to the outer wall of the material box (102) and is then connected to the input end of the compressor (11); and the connecting pipe (3) is connected to the condenser (12); A plurality of ultrasonic generating devices (14) are also installed on the outer wall of the material box (102), and the ultrasonic generating devices (14) are electrically connected to the control device.

9. A geocell pull-out test method under freeze-thaw cycles, applied to the geocell pull-out test device under freeze-thaw cycles as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S100. Soil sample preparation: Collect sufficient soil samples, process and screen them according to the experimental requirements, and weigh the soil samples using an electronic scale to ensure that the quality of each test sample is uniform; A soil sample is placed in the lower layer of the material box (102), and compacted to a designed compaction degree using a vibrator or manually, and then a geocell is placed, and the soil is filled to exceed the geocell and compacted, so that the geocell wraps the soil and the end of the geocell extends out of the material box (102) through the through hole. The compaction of the filling soil in the upper layer of the material box (102) is consistent with the operation of the lower pull box, and the soil filling is ensured to be uniform and substantial during the process; S200. Test preparation: The geocell is placed in a fixed cavity formed by the inner clamping plate (105) and the outer clamping plate (106) and fixed with a nut, then the constant temperature water circulation assembly (8) is turned on, the required water temperature is set, and the temperature sensor is ensured to be consistent with the water tank temperature. The displacement meter (107) is installed at the outer clamping plate (106) to ensure that the value is zero at the beginning of the test; S300. Test process: The required normal pressure is provided by the first jack (104) on the gantry (101), ensuring that it is applied to the center of the loading plate (103), and then the second jack (7) is used to provide the required tension of the reaction pull rod (110), and the value can be measured by the force sensor (108); As the pulling progresses, the displacement begins to change, and when it reaches the required displacement for the test, the data is recorded and processed.

10. The geocell pull-out test method under freeze-thaw cycles according to claim 9, characterized in that: The data recording and processing in step S300 includes real-time acquisition and timed acquisition, and the parameters are adjusted in real time for multiple times.

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