A device for detecting moisture migration of frozen soil in highway engineering

Abstract

The invention discloses a device for detecting the migration of frozen soil moisture in highway engineering, which belongs to the technical field of frozen soil moisture migration research, and comprises: an experimental box, which is composed of two detachable and spliced ​​insulation frames; an assembly set, which is fixed in the middle of the experimental box and is used to connect and assemble the two insulation frames of the experimental box; a temperature control unit, which is horizontally arranged in each of the storage spaces, and the ends of the temperature control unit are all sealed and connected with the assembly set; an inner cover net, the center of which is fixed in the assembly set; a liquid delivery system, which is symmetrically arranged at the two end positions of the outside of the experimental box, and each of the liquid delivery systems is sealed and connected with the temperature control unit; a water replenishment device, which is installed on the side wall of each of the temperature control units; a nuclear magnetic resonance detector is arranged outside the experimental box; the invention can ensure that the roadbed soil forms a temperature gradient in the axial direction during moisture migration detection, so as to more accurately control the temperature of each position and improve the controllability and accuracy of the experiment.

Description

Technical Field

[0001] The invention belongs to the technical field of frozen soil moisture migration research, and in particular is a frozen soil moisture migration detection device for highway engineering. Background Art

[0002] About 50% of my country's land area is located in seasonal frozen soil areas, and a large number of highway subgrade buildings are damaged due to uneven frost heaving of the subgrade soil. Subgrade frost damage has become an urgent problem to be solved in highway engineering management. However, due to its unique geographical location and climatic conditions, the soil in Inner Mongolia has been subjected to freeze-thaw cycles for a long time, which has caused serious damage to roadbed buildings and posed many challenges to construction and maintenance. At present, it is generally believed in the study of frozen soil damage mechanism that the ice segregation mechanism characterized by stratified crystallization and unfrozen water migration is the main cause of soil frost heave and structural damage. Studying the water migration process inside the rock and soil during the freeze-thaw process is a key link in revealing the freeze-thaw damage mechanism of the rock and soil. In the prior art, such as the invention patent with publication number CN106770418B, it can independently control the temperature of the two ends of the rock and soil sample to simulate the natural freeze-thaw environment, and use nuclear magnetic resonance technology to detect the water phase distribution in different regions of the rock and soil during the freeze-thaw process in real time. The operation is simple and the measurement accuracy is high. However, in the specific experimental operation, it can only control the temperature of the rock and soil at the end through the cooler. Although it effectively simulates the temperature change under natural conditions, the freezing efficiency of the rock and soil is low and the time consumption is long. At the same time, since the temperature change of the frozen soil is usually affected by the surrounding environment, only using the temperature change at the end will not be able to adjust the temperature distribution of the entire rock and soil, resulting in deviations in the experimental results.

[0003] Therefore, it is necessary to provide a highway engineering frozen soil moisture migration detection device to solve the problems raised in the above background technology. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solution: a highway engineering frozen soil moisture migration detection device, comprising:

[0005] The experimental box is composed of two detachable and spliced ​​insulation frames, and the left and right sides of the experimental box are divided into two storage spaces;

[0006] An assembly set, fixed in the middle of the experimental box, used to connect and assemble the two insulation frames of the experimental box;

[0007] A temperature control unit is horizontally arranged in each of the storage spaces, and ends of the temperature control unit are sealed and connected to the assembly sets;

[0008] An inner cover net, the center of which is fixed in the assembly set, the inner cover net is filled with two types of roadbed soil on the left and right sides, the temperature control unit is in contact with the roadbed soil through the inner cover net, and mesh holes are evenly distributed on the inner cover net;

[0009] Liquid delivery systems are symmetrically arranged at both ends of the exterior of the experimental box, each of the liquid delivery systems is sealed and connected to the temperature control unit, and is used to deliver coolant or heat transfer oil to the temperature control unit;

[0010] A water replenishing device is installed on the side wall of each of the temperature control units, and is used to supply water to each roadbed soil body so that the water content of the two roadbed soil bodies is maintained the same or different; a water supply pipe is vertically connected to the outside of the experimental box, and the water supply pipe is connected to the water replenishing device; a nuclear magnetic resonance detector is arranged outside the experimental box;

[0011] The temperature control unit comprises:

[0012] A positioning seat, fixed in the experimental box, wherein a liquid delivery plate is rotatably connected in the positioning seat;

[0013] A shaft tube, rotatably connected in the positioning seat, one end of the shaft tube being sealed and connected to the liquid delivery disk;

[0014] A heat-conducting ring is coaxially mounted on the side of the liquid-feeding plate away from the shaft tube, and a plurality of heat-conducting channels are distributed on the inner circumference of the heat-conducting ring; two liquid discharge channels and liquid inlet channels are coaxially arranged in the shaft tube, the liquid discharge channel is located outside the liquid inlet channel, and two flow channels are opened in the liquid-feeding plate, the liquid discharge channel and the liquid inlet channel are respectively connected to the two flow channels, and the other ends of the two flow channels are connected to the heat-conducting channel;

[0015] The transmission teeth are sleeved outside the shaft tube, and a motor drive unit is installed outside the experimental box. The output end of the motor drive unit is connected to the transmission teeth through a tooth chain for transmission.

[0016] Further, preferably, the liquid delivery system comprises:

[0017] The return pipe is connected to the outside of the experimental box and is used to discharge the coolant or heat transfer oil sent to the temperature control unit to the outside;

[0018] A tee is installed at the other end of the return pipe, the other two ports of the tee are connected to external pipes, and a control valve is provided between each external pipe and the tee;

[0019] A liquid changing unit and an oil changing unit are respectively connected to the other end of each of the external tubes, the liquid changing unit is used to recover the coolant transported in one of the external tubes, and the oil changing unit is used to recover the heat transfer oil transported in the other external tube;

[0020] A transfer tube installed at the discharge end of each of the liquid change units and the oil change unit;

[0021] The delivery pipe is arranged in parallel on one side of the return pipe, and the other end of each transfer pipe is connected to the delivery pipe. The delivery pipe is also provided with an electronic pressure gauge.

[0022] Further, preferably, a heat exchanger is provided in both the liquid exchange unit and the oil exchange unit, and the heat exchanger performs heat exchange with an external heat source or a cold medium so as to adjust the regeneration temperature of the coolant and the heat transfer oil.

[0023] Further, as a preference, a double-channel tube is horizontally fixed in the experimental box, and two inner gaps are arranged in the double-channel tube, and one end of the two inner gaps is symmetrically distributed on the left and right, and the delivery pipe and the return pipe are respectively connected to the inner gaps;

[0024] The other ends of the two inner gaps are distributed concentrically, the dual-channel tube is rotatably connected to the shaft tube, and the two inner gaps are respectively connected to the liquid discharge channel and the liquid inlet channel in the shaft tube.

[0025] Further, preferably, the water replenishing device comprises:

[0026] There are multiple outer cover plates distributed around the circumference, and each of the outer cover plates is embedded and fixed on the outer wall of the heat-conducting ring;

[0027] A direct current channel is arranged inside the outer cover plate and distributed along the axial direction, and a plurality of partitions are arranged on the inner wall of the heat-conducting ring and located at each of the outer cover plates;

[0028] A water replenishment nozzle is arranged between the partitions and vertically fixed on the heat-conducting ring, and one end of the water replenishment nozzle is sealed and connected to the direct current channel;

[0029] A sealing ring sleeve is fixed in the experimental box, the sealing ring sleeve is rotatably sleeved outside the heat-conducting ring through a sealing ring, and the water supply pipe is vertically connected to the sealing ring sleeve;

[0030] A water guide hole is provided on each of the outer cover plates and is located in the sealing ring sleeve, and the water guide hole is connected with the direct current channel.

[0031] Furthermore, preferably, a water replenishment gap is left between the liquid delivery plate and the roadbed soil, and a plurality of collecting channels are vertically distributed on the heat conductive ring at each of the direct current channels, and the collecting channels are connected to the water replenishment gap.

[0032] Further, as a preference, a liquid inlet ring sleeve and a liquid discharge ring sleeve are coaxially arranged on the heat conducting ring, an annular flow cavity is arranged in each of the liquid inlet ring sleeve and the liquid discharge ring sleeve, and a liquid inlet hole is arranged at the lower end of each of the heat conducting channels for synchronously conveying coolant or heat conducting oil to each of the heat conducting channels;

[0033] The drainage ring sleeve is provided with notches at the axial position of each liquid inlet hole; the lower end of the drainage ring sleeve is provided with drainage holes at each of the heat conduction channels, a partition is fixed in the center of the heat conduction channel, and the drainage holes and liquid inlet holes are distributed on both sides of the partition.

[0034] Furthermore, as a preference, a lining plate is slidably connected below the partition plate, and a flow limiting plate is sealingly and slidably arranged in the heat conduction channel, and the lower end of the lining plate is connected to the flow limiting plate; a flow opening is opened on the lining plate;

[0035] A lifting spring is connected below the current limiting plate in each of the heat conduction channels.

[0036] Further, as a preference, the flow limiting plate is displaced axially along the heat conduction channel under the variable pressure transmission of the coolant and the heat conduction oil, so as to adjust the effective heat conduction area of ​​the heat conduction channel accordingly;

[0037] The elastic strength of the lifting springs in each of the heat-conducting channels is different, so that the coolant and the heat-conducting oil in the heat-conducting channels flow through different paths under expected pressure.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] In the freeze-thaw moisture migration test of the roadbed soil body in the present invention, the temperature of the roadbed soil body is mainly controlled and adjusted by the temperature control units arranged on both sides of the test box, so as to realize the environmental freeze-thaw simulation. The water replenishment device also arranged therein can send equal or unequal amounts of water to the two roadbed soil bodies, so as to accurately control the moisture content of the two roadbed soil bodies, and facilitate the frozen soil moisture migration test; wherein the heat conduction channel in the heat conduction ring is mainly used to send coolant or heat conduction oil, and heat conduction and cooling can be carried out from the side of the roadbed soil body to make it freeze-thawed. The heat conduction ring can ensure the overall contact cooling of the roadbed soil body during continuous rotation, and on the other hand, when the coolant and heat conduction oil in the heat conduction channel are transported at the expected pressure, the effective areas of each heat conduction channel are different, so that the roadbed soil body can form a temperature gradient in the axial direction, so as to more accurately control the temperature of each position, so that the experimental conditions are more controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 It is a schematic cross-sectional view of a local structure in the present invention;

[0042] Figure 3 for Figure 2 A schematic diagram of the structure enlargement in the middle;

[0043] Figure 4 It is a structural schematic diagram of the liquid delivery system in the present invention;

[0044] Figure 5 It is a structural schematic diagram of the water replenishment device in the present invention;

[0045] Figure 6 It is a schematic diagram of the structure of the heat conduction channel in the present invention;

[0046] In the figure: 1. Experiment box; 11. Assembly set; 12. Inner cover net; 13. Water supply pipe; 2. Temperature control unit; 21. Positioning seat; 22. Liquid delivery plate; 23. Axis tube; 231. Liquid discharge channel; 232. Liquid inlet channel; 24. Transmission gear; 25. Motor drive unit; 3. Liquid delivery system; 31. Reflux pipe; 32. Tee; 33. External pipe; 34. Control valve; 35. Liquid change unit; 36. Oil change unit; 37. Transfer pipe; 38. Delivery pipe; 39. Electronic pressure gauge; 4. Water replenishment device; 41. Outer cover; 42. Partition; 43. Water replenishment nozzle; 44. Sealing ring sleeve; 45. Water guide hole; 46. Collecting channel; 47. DC channel; 5. Heat transfer ring; 51. Liquid inlet ring sleeve; 511. Heat transfer channel; 52. Liquid discharge ring sleeve; 53. Liquid inlet hole; 54. Liquid discharge hole; 55. Notch; 56. Lining plate; 57. Flow limiting plate; 58. Flow port; 59. Lifting spring; 6. Dual-channel pipe; 61. Inner gap channel. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1

[0049] See also Figure 1-Figure 6 In an embodiment of the present invention, a highway engineering frozen soil moisture migration detection device comprises:

[0050] The experimental box 1 is composed of two detachable and spliced ​​insulation frames, and the experimental box 1 is divided into two storage spaces on the left and right sides;

[0051] The assembly set 11 is fixed in the middle of the experimental box 1 and is used to connect and assemble the two insulation frames of the experimental box 1; the insulation frames have a strong heat insulation effect;

[0052] A temperature control unit 2 is horizontally arranged in each of the storage spaces, and ends of the temperature control unit 2 are sealed and connected to the assembly set 11;

[0053] The inner cover net 12 is fixed at its center in the assembly set 11. Two types of roadbed soil are filled in the inner cover net 12 on the left and right sides. The temperature control unit 2 contacts the roadbed soil through the inner cover net 12. Mesh holes are evenly distributed on the inner cover net 12. The inner cover net 12 can wrap the roadbed soil to prevent the roadbed soil from breaking during the experiment.

[0054] The liquid delivery systems 3 are symmetrically arranged at both ends of the exterior of the test box 1. Each of the liquid delivery systems 3 is sealed and connected to the temperature control unit 2, and is used to deliver cooling liquid or heat transfer oil to the temperature control unit 2; thereby, the temperature control unit 2 can perform surface heating or cooling on the roadbed soil during the experiment, so that the roadbed soil is frozen and thawed;

[0055] A water replenishment device 4 is installed on the side wall of each of the temperature control units 2. The water replenishment device 4 is used to supply water to each roadbed soil body so that the two roadbed soil bodies maintain the same or different water contents. A water supply pipe 13 is vertically connected to the outside of the experimental box 1, and the water supply pipe 13 is connected to the water replenishment device 4. A nuclear magnetic resonance detector (not shown in the figure) is arranged outside the experimental box 1. The water in the roadbed soil body will produce a unique relaxation signal in the nuclear magnetic resonance detection. By analyzing these signals, the water content and distribution information can be obtained. It uses a non-destructive detection method to detect the water migration process in the roadbed soil body in real time with high accuracy.

[0056] The temperature control unit 2 comprises:

[0057] A positioning seat 21 is fixed in the experimental box 1, and a liquid feeding plate 22 is rotatably connected in the positioning seat 21;

[0058] A shaft tube 23 is rotatably connected in the positioning seat 21, and one end of the shaft tube 23 is sealedly connected to the liquid feeding disk 22;

[0059] The heat-conducting ring 5 is coaxially mounted on the side of the liquid-feeding plate 22 away from the shaft tube 23, and a plurality of heat-conducting channels 511 are distributed on the inner circumference of the heat-conducting ring 5; two concentrically arranged drainage channels 231 and liquid inlet channels 232 are arranged in the shaft tube 23, and the drainage channel 231 is located outside the liquid inlet channel 232, and two flow channels are opened in the liquid-feeding plate 22, and the drainage channel 231 and the liquid inlet channel 232 are respectively connected to the two flow channels, and the other ends of the two flow channels are connected to the heat-conducting channel 511;

[0060] The transmission gear 24 is sleeved outside the shaft tube 23. A motor drive unit 25 is installed outside the test box 1. The output end of the motor drive unit 25 is connected to the transmission gear 24 through a tooth chain. In the specific experimental test, the liquid delivery system 3 can continuously deliver coolant or heat transfer oil to the liquid delivery plate 22 through the shaft tube 23. The coolant and heat transfer oil enter the heat transfer ring 5 through the flow channel, and the heat transfer ring 5 can continuously rotate through the motor drive unit 25, thereby realizing the overall temperature control of the roadbed soil. Compared with the end cooling used in the traditional technology, its advantages are:

[0061] 1. It can speed up the overall temperature control of the roadbed soil and reduce the experimental cycle;

[0062] 2. The heat conduction ring is used to conduct heat to the side wall of the roadbed soil, so that the temperature gradient formed in the axial direction of the roadbed soil can be controlled more accurately at each position;

[0063] 3. It avoids the obvious boundary effect caused by extreme overcooling or overheating of the roadbed soil, prevents the complication of the moisture migration path, and makes the direction and path of moisture migration difficult to predict, which increases the difficulty of experimental analysis.

[0064] In this embodiment, the liquid delivery system 3 includes:

[0065] The reflux pipe 31 is connected to the outside of the experimental box 1 and is used to discharge the cooling liquid or heat transfer oil sent to the temperature control unit 2 to the outside;

[0066] A tee 32 is installed at the other end of the return pipe 31, and the other two ports of the tee 32 are connected to external pipes 33, and a control valve 34 is provided between each external pipe 33 and the tee 32;

[0067] The liquid replacement unit 35 and the oil replacement unit 36 ​​are respectively connected to the other end of each of the external pipes 33, the liquid replacement unit 35 is used to recover the coolant transported in one of the external pipes 33, and the oil replacement unit 36 ​​is used to recover the heat transfer oil transported in the other external pipe 33;

[0068] A transfer tube 37 is installed at the discharge end of each of the liquid exchange unit 35 and the oil exchange unit 36;

[0069] The delivery pipe 38 is arranged in parallel on one side of the return pipe 31, and the other end of each transfer pipe 37 is connected to the delivery pipe 38. The delivery pipe 38 is also provided with an electronic pressure gauge 39, which can monitor the flow pressure of the coolant and the heat transfer oil in the delivery pipe 38 in real time.

[0070] As a preferred embodiment, the liquid exchange unit 35 and the oil exchange unit 36 ​​are both provided with a heat exchanger, and the heat exchanger performs heat exchange with an external heat source or a cold medium to adjust the regeneration temperature of the coolant and the thermal oil, thereby realizing the continuous recycling of the coolant and the thermal oil.

[0071] In this embodiment, a double-channel tube 6 is horizontally fixed in the experimental box 1, and two inner gaps 61 are provided in the double-channel tube 6. One end of the two inner gaps 61 is symmetrically distributed on the left and right, and the delivery pipe 38 and the return pipe 31 are respectively connected to the inner gaps 61;

[0072] The other ends of the two inner gap channels 61 are distributed concentrically, the dual-channel tube 6 is rotatably connected to the shaft tube 23, and the two inner gap channels 61 are respectively connected to the drainage channel 231 and the liquid inlet channel 232 in the shaft tube 23, wherein the drainage channel 231 can be connected to the return pipe 31 through the inner gap channel 61, and the liquid inlet channel 232 is connected to the delivery pipe 38 through the inner gap channel 61.

[0073] In this embodiment, the water replenishing device 4 includes:

[0074] There are multiple outer cover plates 41 distributed around the circumference, and each of the outer cover plates 41 is embedded and fixed on the outer wall of the heat conducting ring 5;

[0075] The direct current channel 47 is arranged in the outer cover plate 41 and distributed along the axial direction. A plurality of partition plates 42 are arranged on the inner wall of the heat conducting ring 5 and located at each of the outer cover plates 41;

[0076] A water replenishment nozzle 43 is disposed between the partitions 42 and vertically fixed on the heat conducting ring 5, and one end of the water replenishment nozzle 43 is sealed and connected to the direct current channel 47;

[0077] The sealing ring sleeve 44 is fixed in the experimental box 1, and the sealing ring sleeve 44 is rotatably sleeved on the outside of the heat conducting ring 5 through a sealing ring, and the water supply pipe 13 is vertically connected to the sealing ring sleeve 44;

[0078] The water guide hole 45 is opened on each of the outer cover plates 41 and is located in the sealing ring sleeve 44. The water guide hole 45 is connected to the direct current channel 47, so that water can be sent into the direct current channel 47 through the water guide hole 45, and multiple water replenishment nozzles 43 can replenish water to the roadbed soil at a fixed point, thereby realizing overall water replenishment of the roadbed soil and improving the uniformity of water replenishment.

[0079] In this embodiment, a water replenishment gap is left between the liquid delivery plate 22 and the roadbed soil, and a plurality of collecting channels 46 are vertically distributed at each of the direct current channels 47 on the heat conductive ring 5, and the collecting channels 46 are connected to the water replenishment gap, so that the end of the roadbed soil can be further replenished with water, so that the water content at the end of the roadbed soil is slightly higher than that of the rest of the parts, which is convenient for moisture migration detection tests.

[0080] As a preferred embodiment, a liquid inlet ring 51 and a liquid discharge ring 52 are coaxially arranged on the heat conducting ring 5, and an annular flow cavity is arranged in each of the liquid inlet ring 51 and the liquid discharge ring 52. The lower end of the liquid inlet ring 51 is located at each of the heat conducting channels 511 and is provided with a liquid inlet hole 53 for synchronously conveying coolant or heat conducting oil to each of the heat conducting channels 511;

[0081] In addition, the drainage ring sleeve 52 is provided with a notch 55 at the axial position of each liquid inlet hole 53; it is convenient for the coolant or heat-conducting oil to flow into the heat-conducting channel 511 through the notch 55, and the lower end of the drainage ring sleeve 52 is provided with a drainage hole 54 at each of the heat-conducting channels 511. A partition is fixed in the center of the heat-conducting channel 511, and the drainage hole 54 and the liquid inlet hole 53 are distributed on both sides of the partition, so that the coolant and the heat-conducting oil form a U-shaped flow trajectory in the heat-conducting channel 511.

[0082] In this embodiment, a lining plate 56 is slidably connected below the partition, and a flow limiting plate 57 is sealed and slidably arranged in the heat conduction channel 511, and the lower end of the lining plate 56 is connected to the flow limiting plate 57; a flow opening 58 is opened on the lining plate 56;

[0083] A lifting spring 59 is connected to each of the heat conduction channels 511 below the current limiting plate 57 .

[0084] In this embodiment, the flow limiting plate 57 is displaced axially along the heat conduction channel 511 under the variable pressure transmission of the coolant and the heat conduction oil, so as to adjust the effective heat conduction area of ​​the heat conduction channel 511 accordingly;

[0085] The elastic strength of the lifting springs 59 in each of the heat-conducting channels 511 is different, so that the coolant and the heat-conducting oil in the heat-conducting channels 511 flow through different paths under the expected pressure. In particular, in the temperature control and regulation of the roadbed soil, for the roadbed soil on the freezing side, it is preferred to use a pressure higher than the expected pressure to transport the coolant. At this time, each limiting plate 57 is displaced to the extreme position in the heat-conducting channel 511, and each lifting spring 59 is fully compressed, thereby forming a rapid cooling and freezing of the roadbed soil as a whole. When the temperature of the roadbed soil is close to the experimental target value, the coolant is transported at the expected pressure. At this time, the effective heat-conducting areas of each heat-conducting channel 511 in the heat-conducting ring 5 are different in size, and the heat-conducting ring 5 can enable the roadbed soil to form a temperature gradient in the axial direction during continuous rotation, thereby more accurately controlling the temperature of each position, improving the controllability of the experiment, and preventing the complication of the moisture migration path.

[0086] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A highway engineering frozen soil moisture migration detection device, characterized in that: It includes: The experimental box (1) is composed of two detachable and spliced ​​heat-insulating frames, and the experimental box (1) is divided into two storage spaces on the left and right sides; An assembly set (11), fixed to the middle of the experimental box (1), and used to connect and assemble the two insulation frames of the experimental box (1); A temperature control unit (2) is horizontally arranged in each of the storage spaces, and ends of the temperature control unit (2) are sealed and connected to the assembly set (11); An inner cover net (12) whose center is fixed in the assembly sleeve (11); two types of roadbed soil are filled in the inner cover net (12) on the left and right; the temperature control unit (2) contacts and abuts against the outside of the roadbed soil through the inner cover net (12); and mesh holes are evenly distributed on the inner cover net (12); Liquid delivery systems (3) are symmetrically arranged at two ends of the exterior of the experimental box (1), each of the liquid delivery systems (3) is sealed and connected to the temperature control unit (2), and is used to deliver cooling liquid or heat transfer oil to the temperature control unit (2); A water replenishment device (4) is installed on the side wall of each of the temperature control units (2), and the water replenishment device (4) is used to supply water to each roadbed soil body so that the water content in the two roadbed soil bodies is maintained the same or different; a water supply pipe (13) is vertically connected to the outside of the experimental box (1), and the water supply pipe (13) is connected to the water replenishment device (4); a nuclear magnetic resonance detector is arranged outside the experimental box (1); The temperature control unit (2) comprises: A positioning seat (21) is fixed in the experimental box (1), and a liquid delivery plate (22) is rotatably connected inside the positioning seat (21); A shaft tube (23) is rotatably connected in the positioning seat (21), and one end of the shaft tube (23) is sealedly connected to the liquid delivery plate (22); A heat-conducting ring (5) is coaxially mounted on a side of the liquid-feeding plate (22) away from the shaft tube (23), and a plurality of heat-conducting channels (511) are distributed on the inner circumference of the heat-conducting ring (5); two liquid discharge channels (231) and liquid inlet channels (232) are coaxially arranged in the shaft tube (23), the liquid discharge channel (231) is located outside the liquid inlet channel (232), and two flow channels are opened in the liquid-feeding plate (22), the liquid discharge channel (231) and the liquid inlet channel (232) are respectively connected to the two flow channels, and the other ends of the two flow channels are connected to the heat-conducting channel (511); The transmission teeth (24) are sleeved outside the shaft tube (23); a motor drive unit (25) is installed outside the experimental box (1); and an output end of the motor drive unit (25) is connected to the transmission teeth (24) through a toothed chain for transmission.

2. A highway engineering frozen soil moisture migration detection device according to claim 1, characterized in that: The liquid delivery system (3) comprises: A reflux pipe (31) is connected to the outside of the experimental box (1) and is used to discharge the cooling liquid or heat transfer oil sent to the temperature control unit (2) to the outside; A tee (32) is installed at the other end of the return pipe (31), the other two ports of the tee (32) are connected to external pipes (33), and a control valve (34) is provided between each external pipe (33) and the tee (32); A liquid replacement unit (35) and an oil replacement unit (36) are respectively connected to the other end of each of the external pipes (33); the liquid replacement unit (35) is used to recover the coolant transported in one of the external pipes (33); and the oil replacement unit (36) is used to recover the heat transfer oil transported in the other external pipe (33); A transfer tube (37) installed at the discharge end of each of the liquid exchange units (35) and the oil exchange unit (36); The delivery pipe (38) is arranged in parallel on one side of the return pipe (31), and the other end of each transfer pipe (37) is connected to the delivery pipe (38). The delivery pipe (38) is also provided with an electronic pressure gauge (39).

3. A highway engineering frozen soil moisture migration detection device according to claim 2, characterized in that: The liquid exchange unit (35) and the oil exchange unit (36) are both provided with a heat exchanger, and the heat exchanger performs heat exchange with an external heat source or a cold medium so as to adjust the regeneration temperature of the coolant and the heat transfer oil.

4. A highway engineering frozen soil moisture migration detection device according to claim 2, characterized in that: A double-channel tube (6) is horizontally fixed in the experimental box (1), and two inner gap channels (61) are arranged in the double-channel tube (6). One end of the two inner gap channels (61) is symmetrically distributed on the left and right, and the delivery tube (38) and the return tube (31) are respectively connected to the inner gap channels (61); The other ends of the two inner gap channels (61) are cocentrically distributed, the dual-channel tube (6) is rotatably connected to the shaft tube (23), and the two inner gap channels (61) are respectively connected to the liquid discharge channel (231) and the liquid inlet channel (232) in the shaft tube (23).

5. A highway engineering frozen soil moisture migration detection device according to claim 1, characterized in that: The water replenishing device (4) comprises: A plurality of outer cover plates (41) distributed around a circumference, each of the outer cover plates (41) being embedded and fixed on the outer wall of the heat conducting ring (5); A direct current channel (47) is arranged inside the outer cover plate (41) and distributed along the axial direction, and a plurality of partition plates (42) are arranged on the inner wall of the heat conducting ring (5) at each of the outer cover plates (41); a water replenishment nozzle (43) disposed between the partitions (42) and vertically fixed on the heat-conducting ring (5), one end of the water replenishment nozzle (43) being in sealed communication with the direct current channel (47); A sealing ring sleeve (44) is fixed in the experimental box (1), the sealing ring sleeve (44) is rotatably sleeved on the outside of the heat conducting ring (5) via a sealing ring, and the water supply pipe (13) is vertically connected to the sealing ring sleeve (44); A water guide hole (45) is formed on each of the outer cover plates (41) and is located in the sealing ring sleeve (44); the water guide hole (45) is connected to the direct flow channel (47).

6. A highway engineering frozen soil moisture migration detection device according to claim 5, characterized in that: A water replenishment gap is left between the liquid delivery plate (22) and the roadbed soil, and a plurality of flow collecting channels (46) are vertically distributed at each of the direct current channels (47) on the heat conducting ring (5), and the flow collecting channels (46) are connected to the water replenishment gap.

7. A highway engineering frozen soil moisture migration detection device according to claim 1, characterized in that: A liquid inlet ring sleeve (51) and a liquid discharge ring sleeve (52) are coaxially arranged on the heat conducting ring (5), and an annular flow cavity is arranged inside the liquid inlet ring sleeve (51) and the liquid discharge ring sleeve (52), and a liquid inlet hole (53) is arranged at the lower end of each heat conducting channel (511) for synchronously conveying coolant or heat conducting oil to each heat conducting channel (511); Furthermore, the drainage ring sleeve (52) is provided with a notch (55) at an axial position of each liquid inlet hole (53); the lower end of the drainage ring sleeve (52) is provided with a drainage hole (54) at each of the heat conduction channels (511); a partition is fixed at the center of the heat conduction channel (511); and the drainage hole (54) and the liquid inlet hole (53) are distributed on both sides of the partition.

8. A highway engineering frozen soil moisture migration detection device according to claim 7, characterized in that: A lining plate (56) is slidably connected below the partition plate, and a flow limiting plate (57) is sealingly and slidably provided in the heat conduction channel (511), and the lower end of the lining plate (56) is connected to the flow limiting plate (57); a flow opening (58) is provided on the lining plate (56); A lifting spring (59) is connected to each of the heat conduction channels (511) below the flow limiting plate (57).

9. A highway engineering frozen soil moisture migration detection device according to claim 8, characterized in that: The flow limiting plate (57) is displaced axially along the heat conduction channel (511) under the pressure-changing transmission of the coolant and the heat conduction oil, thereby correspondingly adjusting the effective heat conduction area of ​​the heat conduction channel (511); The elastic strengths of the lifting springs (59) in the heat-conducting channels (511) are different, so that the coolant and the heat-conducting oil in the heat-conducting channels (511) flow through different paths under expected pressures.

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