Freezing temperature field model test system device for material nonlinear clay

Abstract

The invention relates to the technical field of clay freezing and thawing process research, and provides a material nonlinear clay freezing temperature field model test system device which comprises a model box body and an adjusting assembly, the adjusting assembly is used for detecting a soil body in the model box body, the top of the model box body is connected with the adjusting assembly, and the adjusting assembly is connected with the model box body. The model box body comprises a model frame, model plates and a box cover, the three model plates and an adjusting plate are arranged on the outer side of the model frame, the three model plates and the adjusting plate wrap the model frame to form a test container for containing a soil body, a first electric push rod and a second electric push rod are used for enabling a filter plate to incline, and the filter plate is arranged on the box cover. Then moisture in the soil body migrates through negative pressure generated by movement of a piston plate, the moisture in the soil body rapidly enters a drainage bin through a filter plate, the purpose of drainage is achieved, the water accumulation degree in the soil body is reduced, and the accuracy of experimental data is further ensured in the soil body freezing and thawing cycle experiment process.

Description

Technical Field

[0001] The invention relates to the technical field of clay freeze-thaw process research, and in particular to a freezing temperature field model test system device for nonlinear clay material. Background Art

[0002] Seasonal changes, global warming and temperature changes caused by various human factors will affect the depth, strength, deformation and stability of natural frozen soil. In permafrost areas and seasonal frozen soil areas, strength, deformation, stability and frost heave and thaw settlement calculations are important contents for evaluating its use function and whether it can operate safely. In addition, with the development of society and economy, freezing construction is widely used in engineering fields such as mining, water conservancy, transportation, and construction. Before freezing construction, the soil in the construction area needs to be tested. The equipment that needs to be used in the detection stage is the freezing temperature field model test system device of the material nonlinear clay, which is used to test the data of soil temperature field changes in the construction area.

[0003] A Chinese patent with application number CN202110477276.9 discloses an experimental system for simulating a high-altitude frozen soil thawing zone, the system comprising a box device, the box device comprising a box, the box being filled with test soil; a temperature control device comprising a temperature control box, the box being placed in the temperature control box, the temperature control device being used to control the temperature in the box; a water supply device for inputting water into the box, the water supply device comprising a water supply pipe.

[0004] According to the above-mentioned prior art, it is found that the soil needs to be frequently subjected to freeze-thaw cycle experiments in the laboratory, that is, the water in the soil will frequently be in the process of freezing and melting. During this process, the water in the soil will migrate and the water at high places will flow to low places under the action of gravity and gather together, which will cause water accumulation in the bottom area of ​​the soil. If the accumulated water is not cleaned and discharged in time, it will cause the accumulated water to form local high-water content areas in the soil. These areas will melt and sink faster, which may easily lead to depressions, cracks and the like on the surface of the soil, further destroying the integrity of the soil and affecting the experimental data.

[0005] Therefore, it is necessary to solve the above problems through a freezing temperature field model test system device of material nonlinear clay. Summary of the invention

[0006] The purpose of the present invention is to provide a freezing temperature field model test system device for nonlinear clay material to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a freezing temperature field model test system device for nonlinear clay material, comprising a model box and an adjustment component, the adjustment component is used to detect the soil in the model box, the top of the model box is connected to the adjustment component, the model box comprises a model frame, a model plate and a box cover, three model plates and an adjustment plate are respectively arranged on the outside of the model frame, the three model plates and the adjustment plate cover the model frame to form a test container for containing the soil, the box cover is located on the top of the model frame, the box cover is used to seal the top of the model frame, a temperature test system is arranged inside the model box, and the temperature test system is used to detect the temperature of the soil during the soil experiment; The adjustment component includes a circular tube, the end of the circular tube close to the box cover is connected to a probe, the probe passes through the box cover and is arranged inside the model frame, an accommodating space is formed inside the probe, and a humidity sensor for detecting soil humidity is arranged inside the end of the probe away from the box cover, a waterproof pad is arranged on the inner wall of the probe close to the humidity sensor, and a plurality of through holes are arranged on the outer surface of the probe.

[0008] Preferably, one end of the circular tube away from the box cover is connected with a first delivery pipe, the other end of the first delivery pipe extends outward along the outer surface of the box cover and is connected with a water pump, the water pump is fixed to one side of the model frame, and the number of the first delivery pipe and the circular tube are both two, each of the first delivery pipe and the circular tube is symmetrically arranged on the upper part of the box cover, and the two first delivery pipes are connected with the water pump; A second delivery pipe is connected to one side of the water vapor pump, and the water vapor pump is used to transport or absorb gas and moisture to the first delivery pipe and the second delivery pipe respectively. Connectors are provided at the connections between the water vapor pump and the first delivery pipe and the second delivery pipe, and the connectors are used to threadably connect the first delivery pipe and the second delivery pipe to the output ends of the water vapor pump.

[0009] Preferably, the adjustment assembly further comprises a drainage chamber, the drainage chamber is located at the bottom of the model box, the drainage chamber is interconnected with the bottom of the model box through an elastic fixing member, and one side of the drainage chamber is interconnected with the second delivery pipe; An electromagnetic slide rail is provided on one side of the inner wall of the drainage bin, and the interior of the electromagnetic slide rail is interconnected with one side of the piston plate through an electromagnetic slider. A transmission shaft runs through the interior of the piston plate, and a micro motor is provided at the end of the transmission shaft away from the piston plate. A mounting plate is provided on the outer surface of the micro motor, and the other side of the mounting plate is interconnected with the electromagnetic slider.

[0010] Preferably, a sealing rubber belt is provided on the top of the piston plate, and the sealing rubber belt is folded and fit inside the drainage bin. A first electric push rod and a second electric push rod are respectively provided on the bottom of the inner wall of the drainage bin, and the first electric push rod and the second electric push rod are symmetrically arranged inside the drainage bin, and waterproof material is provided on the outer sides of the first electric push rod and the second electric push rod.

[0011] Preferably, a filter plate is provided on the top of the inner wall of the drainage bin, and the edge of the filter plate is interconnected with the bottom of the model box, and the bottom of the filter plate is interconnected with the output ends of the first electric push rod and the second electric push rod, and the filter plate is used to support the soil in the model box.

[0012] Preferably, a three-dimensional pressure cell and a three-dimensional strain rosette are respectively provided on the surface of the filter plate, the three-dimensional pressure cell is used to measure and record stress data in the soil, and the three-dimensional strain rosette is used to detect and record data on stress distribution changes in the soil.

[0013] Preferably, three freezing tubes are laterally distributed on one side of the model plate, and the three freezing tubes are used to cool the soil. A plurality of reinforcing ribs are provided on the outer side of the model plate, and the reinforcing ribs are used to reinforce the model box.

[0014] Preferably, a connecting seat is symmetrically provided on one side of the model box, a transverse support rod is fixedly provided between the two connecting seats, two threaded rods are symmetrically provided on one side of the transverse support rod, the two threaded rods pass through the transverse support rod and are connected to one side of the adjustment plate, and the outer threads of the two threaded rods are connected to the inner threads of the transverse support rod, and the adjustment plate is movably connected to one side of the model frame.

[0015] The technical effects and advantages of the present invention are as follows: 1. The present invention sets the piston plate and the filter plate and other components to cooperate with each other, uses the first electric push rod and the second electric push rod to tilt the filter plate, and then the negative pressure generated by the movement of the piston plate causes the moisture in the soil to migrate, allowing the moisture in the soil to quickly pass through the filter plate into the drainage bin, thereby completing the purpose of drainage, reducing the degree of water accumulation in the soil, and further ensuring the accuracy of the experimental data during the soil freeze-thaw cycle experiment.

[0016] 2. The present invention sets a water vapor pump, a first delivery pipe, a circular tube, a probe and other components to cooperate with each other, and uses the water vapor pump to cooperate with the first delivery pipe to control the probe to blow or evacuate air, so as to generate a pressure difference inside the soil, and cooperate with the inclination of the filter plate to guide the area with higher water content to flow into the area with lower water content, thereby achieving the purpose of water migration, ensuring that the water content in the experimental soil is always in a balanced state, and ensuring the accuracy of the data during the soil freeze-thaw experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front view of the overall structure of the mirror of the present invention; Figure 3 This is a schematic diagram of the overall structure of the present invention in an open state; Figure 4 This is a schematic diagram of the assembly structure of the round tube and the probe of the present invention; Figure 5 This is a schematic diagram of the structure of the probe in the open state of the present invention; Figure 6 This is a schematic diagram of the initial state of the piston plate and filter plate structure of the present invention; Figure 7 This is a schematic diagram of the working state structure of the second electric push rod and the filter plate of the present invention; Figure 8 It is a schematic structural diagram of the working state of the first electric push rod and the filter plate of the present invention.

[0018] In the figure: 1. model box; 101. box cover; 102. model frame; 103. reinforcing ribs; 104. model plate; 105. connecting seat; 106. threaded rod; 107. freezing tube; 108. three-dimensional strain flower; 109. three-dimensional pressure box; 110. adjustment plate; 2. adjustment component; 201. round tube; 202. first conveying pipe; 203. connecting piece; 204. water pump; 205. second conveying pipe; 206. drainage bin; 207. first electric push rod; 208. second electric push rod; 209. probe; 210. through hole; 211. humidity sensor; 212. elastic fixing piece; 213. filter plate; 214. piston plate; 215. transmission shaft; 216. electromagnetic slide rail. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Example 1

[0020] The present invention provides Figures 1 to 8The freezing temperature field model test system device of a nonlinear clay material shown in the figure comprises a model box 1 and an adjustment component 2, the adjustment component 2 is used to detect the soil in the model box 1, the top of the model box 1 is connected to the adjustment component 2, the model box 1 comprises a model frame 102, a model plate 104 and a box cover 101, three model plates 104 and an adjustment plate 110 are respectively arranged on the outside of the model frame 102, the three model plates 104 and the adjustment plate 110 cover the model frame 102 to form a test container for holding the soil, the interior of the model box 1 is provided with a temperature test system, and the temperature test system is used to test the soil during the soil test. The temperature is detected, the box cover 101 is located on the top of the model frame 102, the box cover 101 is used to seal the top of the model frame 102, the adjustment component 2 includes a round tube 201, the end of the round tube 201 close to the box cover 101 is connected to a probe 209, the probe 209 passes through the box cover 101 and is arranged inside the model frame 102, an accommodating space is formed inside the probe 209, and a humidity sensor 211 for detecting soil humidity is arranged inside the end of the probe 209 away from the box cover 101, a waterproof pad is arranged on the inner wall of the probe 209 close to the humidity sensor 211, and a plurality of through holes 210 are arranged on the outer surface of the probe 209.

[0021] like Figure 1 , Figure 2 and Figure 3 , as shown, one end of the circular tube 201 away from the box cover 101 is connected to a first delivery pipe 202, the other end of the first delivery pipe 202 extends outward along the outer surface of the box cover 101 and is connected to a water vapor pump 204, the water vapor pump 204 is fixed to one side of the model frame 102, and the number of the first delivery pipe 202 and the circular tube 201 are both two, each first delivery pipe 202 and the circular tube 201 are symmetrically arranged on the upper part of the box cover 101, the two first delivery pipes 202 are interconnected with the water vapor pump 204, one side of the water vapor pump 204 is connected to a second delivery pipe 205, the water vapor pump 204 is used to transport or absorb gas and moisture to the first delivery pipe 202 and the second delivery pipe 205 respectively, and the connection between the water vapor pump 204 and the first delivery pipe 202 and the second delivery pipe 205 is provided with a connector 203, the connector 203 is used to thread the first delivery pipe 202 and the second delivery pipe 205 to the output end of the water vapor pump 204.

[0022] During use, by setting the first delivery pipe 202 and the circular tube 201, the water pump 204 can deliver gas to or extract gas from the circular tube 201 through the first delivery pipe 202. Since the probe 209 is connected to the circular tube 201, when the water pump 204 delivers or extracts gas to the first delivery pipe 202, the probe 209 extracts moisture from the soil through the multiple through holes 210 set on the outside. In addition, by setting a waterproof pad inside the probe 209, when the probe 209 absorbs moisture from the soil, the moisture enters the first delivery pipe 202 along the through holes 210 and does not contact the humidity sensor 211, thereby avoiding damage or short circuit. In addition, by using the connecting piece 203 set on the water pump 204, when it is necessary to fill the experimental soil or take out the soil after the experiment is completed, the first delivery pipe 202 and the second delivery pipe 205 can be disconnected from the water pump 204 respectively through the connecting piece 203, and the box cover 101 can be removed to perform subsequent operations.

[0023] like Figure 3 As shown, the adjustment component 2 also includes a drainage bin 206, which is located at the bottom of the model box 1. The drainage bin 206 is interconnected with the bottom of the model box 1 through an elastic fixing member 212, and one side of the drainage bin 206 is interconnected with the second conveying pipe 205. An electromagnetic slide rail 216 is provided on one side of the inner wall of the drainage bin 206, and the interior of the electromagnetic slide rail 216 is interconnected with one side of the piston plate 214 through an electromagnetic slider. A transmission shaft 215 runs through the interior of the piston plate 214, and a micro motor is provided at the end of the transmission shaft 215 away from the piston plate 214, and a mounting plate is provided on the outer surface of the micro motor, and the other side of the mounting plate is interconnected with the electromagnetic slider.

[0024] When in use, by setting up the drainage bin 206, the accumulated water generated by the experimental soil during repeated freeze-thaw cycles can flow to the bottom under the action of gravity and enter the interior of the drainage bin 206, and then the water in the drainage bin 206 is discharged to the outside through the cooperation of the water vapor pump 204 and the second delivery pipe 205, and by setting an electromagnetic slide rail 216 on the inner wall of the drainage bin 206, the piston plate 214 is controlled to slide left and right inside the drainage bin 206. In addition, the micro motor set in the mounting plate is used to cooperate with the transmission shaft 215 to control the piston plate 214 to flip, so as to change the negative pressure area generated when the water vapor pump 204 is in the suction state by moving the piston plate 214, so as to further extract the accumulated water in time.

[0025] A sealing rubber belt is provided on the top of the piston plate 214, and the sealing rubber belt is folded and fitted inside the drainage bin 206. A first electric push rod 207 and a second electric push rod 208 are respectively provided at the bottom of the inner wall of the drainage bin 206, and the first electric push rod 207 and the second electric push rod 208 are symmetrically arranged inside the drainage bin 206. The outer sides of the first electric push rod 207 and the second electric push rod 208 are provided with waterproof materials. A filter plate 213 is provided on the top of the inner wall of the drainage bin 206, and the edge of the filter plate 213 is interconnected with the bottom of the model box 1, and the bottom of the filter plate 213 is interconnected with the output ends of the first electric push rod 207 and the second electric push rod 208. The filter plate 213 is used to support the soil in the model box 1, and the surface of the filter plate 213 is respectively provided with a three-dimensional pressure box 109 and a three-dimensional strain flower 108, the three-dimensional pressure box 109 is used to measure and record stress data in the soil, and the three-dimensional strain flower 108 is used to detect and record data on stress distribution changes in the soil.

[0026] When in use, a sealing rubber belt is set on the top of the piston plate 214, so that when the first electric push rod 207 and the second electric push rod 208 are controlled to deflect the filter plate 213, the sealing rubber belt is still in contact with the top filter plate 213, so that the piston plate 214 is always in a piston state during the movement. In addition, by setting waterproof material on the outside of the first electric push rod 207 and the second electric push rod 208, it is avoided that the first electric push rod 207 and the second electric push rod 208 are located in the drainage bin 206 for a long time and are damaged by contact with accumulated water, and a three-dimensional pressure box 109 and a three-dimensional strain flower 108 are respectively set on the surface of the filter plate 213, so as to detect and record the pressure generated by the frost heave of the soil and the stress change data generated by the soil during the freeze-thaw cycle.

[0027] Three freezing tubes 107 are horizontally distributed on one side of the model plate 104, and the three freezing tubes 107 are used to cool the soil. A plurality of reinforcing ribs 103 are provided on the outer side of the model plate 104, and the reinforcing ribs 103 are used to reinforce the model box 1. A connecting seat 105 is symmetrically provided on one side of the model box 1, and a transverse support rod is fixedly provided between the two connecting seats 105. Two threaded rods 106 are symmetrically provided on one side of the transverse support rod, and the two threaded rods 106 pass through the transverse support rod and are connected to one side of the adjustment plate 110, and the outer threads of the two threaded rods 106 are connected to the inner threads of the transverse support rod, and the adjustment plate 110 is movably connected to one side of the model frame 102.

[0028] When in use, by horizontally arranging three freezing tubes 107 in the model box 1, and when the three freezing tubes 107 are in working state, the experimental soil in the model box 1 can be fully cooled, so that the experimental soil is at the temperature required for the test, so as to better obtain experimental data and further study. At the same time, two threaded rods 106 and transverse support rods are arranged, and the threaded rod 106 is manually rotated to slide inside the transverse support rod, and the adjustment plate 110 is pushed to move inside the model box 1, so as to adjust the required soil test area according to experimental requirements.

[0029] When using this embodiment, firstly, the three-dimensional pressure and three-dimensional strain rosette 108 required for the experiment are embedded in the interior of the model box 1, and then the pre-prepared nonlinear clay is placed in the interior of the model box 1, and then the two threaded rods 106 are manually rotated according to the actual needs of the experiment to make the adjustment plate 110 slide in the interior of the model box 1, so as to adjust the experimental space inside the model box 1, and then the freezing tube 107 arranged in the interior of the model box 1 is opened, so that the freezing tube 107 starts to cool the soil in the model box 1, so that the soil quickly enters the boundary experiment process of the freeze-thaw cycle, and in this process, the three-dimensional pressure box 109 and the three-dimensional strain rosette 108 embedded in the model box 1 are used to detect and record the soil in the freeze heave and The stress change and pressure intensity data during the thawing and settling process are collected to gradually analyze the various properties of the soil and achieve the purpose of conducting experiments based on the changes in the nonlinear clay freezing temperature field. In addition, during the nonlinear clay experiment, the temperature test system is used to continuously measure the temperature of the nonlinear clay with different degrees of freezing during the experiment, and the measured temperature data is saved. Then, the temperature gradient is calculated according to the temperature points recorded according to the freezing degrees of different states. Then, the frost heave pressure data generated during the freezing process of the nonlinear clay and the stress distribution during the freezing process and the stress change data generated with different freezing degrees are connected and coordinated to obtain the performance status of the nonlinear clay and further improve the nonlinear numerical calculation method of frozen soil. Example 2

[0030] During the freeze-thaw experiment of the experimental soil, since the frozen laboratory soil will produce water migration, during the thawing and settling of the experimental soil, the water in the high places will flow to the low places and gather under the action of gravity, causing water accumulation inside the soil. At this time, although the drainage bin 206 at the bottom of the model box 1 is used to make the accumulated water in the soil flow downward under the action of its own gravity and enter the drainage bin 206, it is easy to accumulate again in the bottom area of ​​the experimental soil during the process of water moving to the bottom, resulting in uneven water in the soil. When the soil is frozen again, it will affect the stress of the soil and the data accuracy of the stress distribution. Based on this, Example 2 is proposed: The moisture content of the experimental soil in the model box 1 is detected by two symmetrically distributed probes 209 arranged in the model box 1 in cooperation with the humidity sensor 211 inside the probe 209 , and the detection areas of the two humidity sensors 211 are marked as T and T1 respectively.

[0031] After the soil freezing experiment and in a thawing state, the moisture content of the soil inside the model box 1 is detected by using the humidity sensors 211 in the T area and the T1 area. If the moisture data detected by the T area and the T1 area are at the preset value, it means that there is no water accumulation in the experimental soil. At this time, the pressure and stress distribution data detected by the three-dimensional pressure box 109 and the three-dimensional strain rosette 108 are relatively accurate. No adjustment is made, and the freeze-thaw cycle experiment can be continued.

[0032] If the moisture content in the soil detected by the T area is higher than the preset value, the data detected by the humidity sensor 211 in the T area and the T1 area are compared with each other. If the T area detection data> the T1 area detection data, it means that the moisture content of the soil is unevenly distributed, and the moisture content in the T area is higher, while the moisture content in the T1 area is lower than the preset value. At this time, the second electric push rod 208 is controlled to extend and apply pressure to one side of the filter plate 213, so that the filter plate 213 drives the model box 1 to stretch through one side of the elastic fixing member 212. At this time, the model box 1 is tilted toward the T1 area, so that the moisture in the T area will enter along the tilted direction of the filter plate 213 and the model box 1. Migrate, then control the first delivery pipe 202 through the water-air pump 204 to make the probe 209 in the T area blow air into the soil to increase the pressure, and the water-air pump 204 controls the T area probe 209 and the T1 area probe 209 respectively through the two first delivery pipes 202. In this way, the water-air pump 204 is set to control the probe 209 in the T1 area to generate suction into the soil, so that the pressure in the T area will be higher than the pressure in the T1 area, and the purpose of water migration is achieved by cooperating with the inclination of the filter plate 213 and the model box 1, so that the water content of the T area and the T1 area is even, further ensuring the accuracy of the detection data during the soil freeze-thaw experiment.

[0033] It is worth noting that the water vapor pump 204 is a common existing equipment. The water vapor pump 204 is respectively provided with a plurality of suction nozzles and exhaust nozzles, and is respectively interconnected with the first delivery pipe 202 and the second delivery pipe 205. The water vapor pump 204 can extract water and gas, and the specific principle will not be repeated here.

[0034] If the moisture content in the soil detected by the T1 area is higher than the preset value, the data detected by the humidity sensor 211 in the T area and the T1 area are compared with each other. If the detection data of the T1 area> the detection data of the T area, it means that the moisture distribution of the soil is uneven, and the moisture content of the T1 area is higher, while the moisture content of the T area is lower than the preset value. At this time, the first electric push rod 207 is controlled to extend, and pressure is applied to the filter plate 213, so that the filter plate 213 and the model box 1 are tilted toward the T area through the elastic fixing member 212, and then the probe 209 in the T1 area is controlled by the water pump 204 and the first conveying pipe 202 to blow air into the soil to increase the pressure, and the probe 209 in the T area is controlled to generate suction on the soil. In this state, the pressure in the T area will be lower than the pressure in the T1 area, and the inclination of the filter plate 213 is used to realize water migration, so that the moisture content of the T area and the T1 area is uniform, thereby ensuring the accuracy of the detection data during the soil freeze-thaw experiment.

[0035] If the water content data detected in the T area and the T1 area are both higher than the preset value, it means that the moisture value in the soil is high and the moisture in the soil needs to be drained. At this time, the water pump 204 is controlled to suck air into the drainage chamber 206 through the second delivery pipe 205, and then the electromagnetic slide rail 216 is used to control the piston plate 214 to move in the drainage chamber 206 toward the first electric push rod 207 through the electromagnetic slider. At this time, the pressure at the bottom of the T1 area will gradually increase with the movement of the piston plate 214. However, the pressure in the T area will gradually decrease and generate negative pressure during the mutual cooperation between the water pump 204 and the piston plate 214, and at the same time, the first electric push rod 207 is controlled to extend so that the filter plate 213 and the model box 1 Tilt toward the T area, at this time, the moisture in the soil in the T area will quickly flow to the low-pressure area, and then control the mutual cooperation between the water pump 204 and the first conveying pipe 202 to make the probe 209 in the T area blow outward, and the probe 209 in the T1 area is also in a blowing state. At this time, the accumulated water in the clay in the melting state will be affected by the pressure difference formed by the positive pressure state blown out by the probes 209 in the T area and the T1 area and the negative pressure state in the bottom drainage bin 206. In this way, the moisture will be sucked into the interior of the drainage bin 206 by the bottom drainage bin 206 in cooperation with the water pump 204, and then the first electric push rod 207 is controlled to return to the initial state, so that the filter plate 213 and the model box 1 are in the initial state. , and then the piston plate 214 is controlled to move in the direction of the second electric push rod 208. At this time, as the piston plate 214 moves, negative pressure suction will be generated on the upper soil in the drainage chamber 206 at the bottom of the T1 area. When the piston plate 214 moves to the position of the second electric push rod 208 in the drainage chamber 206, the micro motor is controlled to deflect the piston plate 214, and then the piston plate 214 is quickly controlled to move in the direction of the first electric push rod 207. In this process, the water pump 204 generates negative pressure suction on the drainage chamber 206 in the T area and the T1 area through the second delivery pipe 205. This is to keep the T1 area in a negative pressure state at all times when the piston plate 214 is deflected, and when the piston plate 214 returns to After the initial position (the middle position of the filter plate 213), the water vapor pump 204 is controlled to quickly switch to the blowing state, so that the pressure of the soil in the T area and the drainage bin 206 in the T area is always higher than the pressure of the soil in the T1 area and the drainage bin 206 in the T1 area. Then the second electric push rod 208 is controlled to extend to tilt the filter plate 213 and the model box 1 toward the T1 area, and then the water vapor pump 204 and the first conveying pipe 202 are controlled to cooperate with each other to make the probe 209 in the T area blow outward, and the probe 209 in the T1 area is also in the blowing state and cooperates with the tilted state of the filter plate 213 and the model box 1 at this time, thereby achieving the purpose of discharging the accumulated water in the T area and the T1 area respectively.

[0036] Therefore, by the inclined state of the filter plate 213 and the movement of the piston plate 214 in the drainage chamber 206, the drainage chamber 206 generates a negative pressure state on the bottom of the soil through the filter plate 213. At the same time, the probe 209 blows air into the soil and forms an obvious upper and lower pressure difference inside the soil, so that the accumulated water in the soil can smoothly pass through the filter plate 213 and flow into the drainage chamber 206, thereby completing the cleaning of excess water in the soil, regulating the water content in the soil, and preventing excessive water from interfering with the experimental data.

[0037] It is worth noting that during the thawing process, the internal structure of clay is in dynamic change. The cracks originally caused by the freeze-thaw cycle and the change in the pore structure of the soil caused by thawing will form some channels for gas flow, so gas molecules can migrate and diffuse in the clay along these channels.

[0038] If the moisture content in the soil detected by the probe 209 in the T area and the T1 area is lower than the preset value, it means that the moisture content in the soil is too low, and water needs to be injected into the soil to keep the moisture content in the soil within the preset value to ensure the accuracy of the soil test data. Then, manually rotate the connector 203 at the connection between the water pump 204 and the two first delivery pipes 202 to disconnect the two first delivery pipes 202 from the water pump 204, and then connect the two first delivery pipes 202 to an external water source. Through the two first delivery pipes 202, water is transported to the inside of the probe 209 and water is replenished into the soil through the through hole 210 on the outside of the probe 209, so that the moisture content in the soil in the T area and the T1 area is always at the preset value, thereby avoiding errors in the soil freeze-thaw test data caused by too little moisture.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A freezing temperature field model test system device for nonlinear clay material, comprising a model box (1) and an adjustment component (2), wherein the adjustment component (2) is used to detect the soil in the model box (1), and the top of the model box (1) is connected to the adjustment component (2), characterized in that: The model box (1) comprises a model frame (102), a model plate (104) and a box cover (101); three model plates (104) and an adjustment plate (110) are respectively arranged on the outside of the model frame (102); the three model plates (104) and the adjustment plate (110) cover the model frame (102) to form a test container for containing soil; the box cover (101) is located on the top of the model frame (102); the box cover (101) is used to seal the top of the model frame (102); a temperature testing system is arranged inside the model box (1), and the temperature testing system is used to detect the temperature of the soil during the soil experiment; The regulating assembly (2) comprises a circular tube (201); an end of the circular tube (201) close to the box cover (101) is connected to a probe (209); the probe (209) penetrates the box cover (101) and is arranged inside the model frame (102); an accommodating space is formed inside the probe (209); an end of the probe (209) away from the box cover (101) is provided with a humidity sensor (211) for detecting soil humidity; a waterproof pad is provided on the inner wall of one side of the probe (209) close to the humidity sensor (211); and a plurality of through holes (210) are provided on the outer surface of the probe (209).

2. The freezing temperature field model test system device of a nonlinear clay material according to claim 1, characterized in that: One end of the circular tube (201) away from the box cover (101) is connected to a first delivery tube (202); the other end of the first delivery tube (202) extends outwardly along the outer surface of the box cover (101) and is connected to a water pump (204); the water pump (204) is fixed to one side of the model frame (102); and the number of the first delivery tubes (202) and the circular tubes (201) are both two; each of the first delivery tubes (202) and the circular tube (201) is symmetrically arranged on the upper part of the box cover (101); and the two first delivery tubes (202) are connected to the water pump (204); A second delivery pipe (205) is provided on one side of the water vapor pump (204), and the water vapor pump (204) is used to deliver or absorb gas and moisture to the first delivery pipe (202) and the second delivery pipe (205), respectively. Connectors (203) are provided at the connection points between the water vapor pump (204) and the first delivery pipe (202) and the second delivery pipe (205), and the connectors (203) are used to threadably connect the first delivery pipe (202) and the second delivery pipe (205) to the output ends of the water vapor pump (204).

3. The freezing temperature field model test system device of a nonlinear clay material according to claim 2, characterized in that: The regulating assembly (2) further comprises a drainage bin (206), wherein the drainage bin (206) is located at the bottom of the model box (1), the drainage bin (206) is interconnected with the bottom of the model box (1) via an elastic fixing member (212), and one side of the drainage bin (206) is interconnected with the second delivery pipe (205); An electromagnetic slide rail (216) is provided on one side of the inner wall of the drainage bin (206); the interior of the electromagnetic slide rail (216) is interconnected with one side of the piston plate (214) via an electromagnetic slider; a transmission shaft (215) is provided running through the interior of the piston plate (214); a micro motor is provided at the end of the transmission shaft (215) away from the piston plate (214); a mounting plate is provided on the outer surface of the micro motor; the other side of the mounting plate is interconnected with the electromagnetic slider.

4. The freezing temperature field model test system device of a nonlinear clay material according to claim 3 is characterized by: A sealing rubber belt is provided on the top of the piston plate (214), and the sealing rubber belt is folded and fitted inside the drainage bin (206). A first electric push rod (207) and a second electric push rod (208) are provided at the bottom of the inner wall of the drainage bin (206), respectively. The first electric push rod (207) and the second electric push rod (208) are symmetrically arranged inside the drainage bin (206), and waterproof materials are provided on the outer sides of the first electric push rod (207) and the second electric push rod (208).

5. The freezing temperature field model test system device of a nonlinear clay material according to claim 4, characterized in that: A filter plate (213) is provided on the top of the inner wall of the drainage bin (206), and the edge of the filter plate (213) is interconnected with the bottom of the model box (1), and the bottom of the filter plate (213) is interconnected with the output ends of the first electric push rod (207) and the second electric push rod (208), and the filter plate (213) is used to support the soil in the model box (1).

6. The freezing temperature field model test system device of a nonlinear clay material according to claim 5, characterized in that: A three-dimensional pressure box (109) and a three-dimensional strain rosette (108) are respectively provided on the surface of the filter plate (213); the three-dimensional pressure box (109) is used to measure and record stress data in the soil, and the three-dimensional strain rosette (108) is used to detect and record data on stress distribution changes in the soil.

7. The freezing temperature field model test system device of a nonlinear clay material according to claim 1, characterized in that: Three freezing pipes (107) are arranged transversely on one side of the model plate (104), and the three freezing pipes (107) are used to cool the soil. A plurality of reinforcing ribs (103) are arranged on the outer side of the model plate (104), and the reinforcing ribs (103) are used to reinforce the model box (1).

8. The freezing temperature field model test system device of a nonlinear clay material according to claim 7, characterized in that: A connecting seat (105) is symmetrically provided on one side of the model box (1), a transverse support rod is fixedly provided between the two connecting seats (105), two threaded rods (106) are symmetrically provided on one side of the transverse support rod, the two threaded rods (106) penetrate the transverse support rod and one side of the adjustment plate (110) and are connected to each other, and the outer threads of the two threaded rods (106) are connected to the inner threads of the transverse support rod, and the adjustment plate (110) is movably connected to one side of the model frame (102).

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