Automatic monitoring device for frost heaving deformation of high-speed railway roadbed

Abstract

The utility model discloses an automatic monitoring device for frost heaving deformation of a high-speed railway roadbed, which comprises a first ground temperature sensor group embedded in the center of a cutting line or in the positions close to the inner sides of cable troughs of left and right road shoulders of an embankment; the second ground temperature sensor group is buried in a cutting side ditch platform; the first frost heaving sensor group is embedded in a position close to the center of a cutting line or a position close to the center of an embankment line; the second frost heaving sensor group is embedded in the left center line of the cutting or the left center line of the embankment; the third frost heaving sensor group is embedded in the inner side position close to the road shoulder cable grooves on the left and right sides of the road cut or the road shoulder; the moisture sensor group is embedded in a position close to the frost heaving sensor group; the data acquisition equipment is electrically connected with each sensor group; and the power supply equipment is electrically connected with all the sensor groups and the data acquisition equipment respectively. According to the utility model, automatic acquisition of roadbed frost heaving deformation data is realized, the monitoring efficiency and the data accuracy are improved, and errors and labor intensity of manual operation are reduced.

Description

Technical Field

[0001] The utility model relates to a roadbed monitoring technology, in particular to an automatic monitoring device for frost heave deformation of a high-speed railway roadbed. Background Art

[0002] In the construction of high-speed railways in high-cold seasonal frozen areas, the roadbed is usually located on frozen soil. Frozen soil has unique physical properties. The phase change process in its freeze-thaw cycle will cause changes in moisture state and volume, which will cause damage or deformation to the roadbed structure, thus affecting the safety and stability of the structure. With the increase in the number of freeze-thaw cycles, the freezing depth and surface frost heave of the roadbed will change, increasing the risk of roadbed damage. Especially for high-speed railways, even a slight deformation of the roadbed may reduce the smoothness of the line and affect driving safety and comfort.

[0003] In high-cold areas where frozen soil is widely distributed, comprehensive monitoring of frost heave of railway subgrade is particularly important. The challenge is that the freezing depth and surface frost heave must be accurately measured in order to effectively manage and control the frost heave effect of the subgrade. Traditional monitoring methods, such as manual leveling, can provide intuitive apparent deformation data, but due to the limitations of on-site conditions, their accuracy and continuity are often difficult to meet the strict requirements of high-speed railways. Manual measurements are easily disturbed by on-site construction activities, resulting in large measurement errors, and are unable to provide continuous data on important geotechnical parameters such as temperature and moisture content.

[0004] Therefore, developing an automated, high-precision monitoring device that can monitor the state and changes of permafrost in real time is crucial to ensuring the safe and stable operation of high-speed railways in high-altitude and cold regions. Utility Model Content

[0005] In order to solve the problems existing in the above-mentioned prior art, the utility model aims to provide a device that can realize automatic and high-precision real-time monitoring of the state and changes of frozen soil, so as to ensure the safe and stable operation of high-speed railways in high-cold areas.

[0006] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model includes:

[0007] The automatic monitoring device for frost heave deformation of high-speed railway subgrade includes:

[0008] The first geothermal sensor group is vertically buried in the center of the cutting line or in the inner side of the cable trough near the left and right shoulders of the embankment; the second geothermal sensor group is vertically buried at the platform of the side ditch of the cutting; the first geothermal sensor group and the second geothermal sensor group respectively include a plurality of geothermal sensors arranged at intervals;

[0009] The first frost heave sensor group is vertically buried near the center of the cutting line or near the center of the embankment line; the second frost heave sensor group is vertically buried at the left center line of the cutting or the left center line of the embankment; the third frost heave sensor group is vertically buried near the inner side of the cable trough of the left and right shoulders of the cutting or near the inner side of the cable trough of the left and right shoulders of the embankment; the first frost heave sensor group, the second frost heave sensor group and the third frost heave sensor group respectively include a plurality of frost heave sensors arranged at intervals;

[0010] A first moisture sensor group is vertically buried near the first frost heave sensor group; a second moisture sensor group is vertically buried near the third frost heave sensor group; the first moisture sensor group and the second moisture sensor group respectively include a plurality of moisture sensors arranged at intervals;

[0011] The data acquisition equipment is electrically connected to each temperature sensor group, each frost heave sensor group and each moisture sensor group respectively;

[0012] The power supply equipment is electrically connected to each temperature sensor group, each frost heave sensor group, each moisture sensor group and the data acquisition equipment respectively.

[0013] In some preferred embodiments, it also includes:

[0014] A water level sensor is installed at the bottom of the water level hole at the side ditch platform of the road cutting or at the foot of the embankment.

[0015] In some preferred embodiments, the first geothermal sensor group, the second geothermal sensor group, the first frost heave sensor group, the second frost heave sensor group, the third frost heave sensor group, the first moisture sensor group and the second moisture sensor group are all arranged on the same cross section of the high-speed railway roadbed.

[0016] In some preferred embodiments, the first geothermal sensor group, the second geothermal sensor group, the first frost heave sensor group, the second frost heave sensor group, the third frost heave sensor group, the first moisture sensor group, the second moisture sensor group and the water level sensor are all arranged on the same cross section of the high-speed railway roadbed.

[0017] In some preferred embodiments, the first geothermal sensor group includes a first geothermal sensor connecting rod, and 15 geothermal sensors respectively installed on the outer surface of the first geothermal sensor connecting rod, and the distance between any two adjacent geothermal sensors is 200 mm;

[0018] After the first ground temperature sensor group is buried, the top ground temperature sensor is 100mm-150mm away from the roadbed surface.

[0019] In some preferred embodiments, the second geothermal sensor group includes a second geothermal sensor connecting rod, and 10 geothermal sensors respectively installed on the outer surface of the second geothermal sensor connecting rod, and the distance between any two adjacent geothermal sensors is 200 mm;

[0020] After the second geothermal sensor group is buried, the uppermost geothermal sensor is 100mm-150mm away from the roadbed surface.

[0021] In some preferred embodiments, the first frost heave sensor group, the second frost heave sensor group and the third frost heave sensor group respectively include a frost heave sensor connecting rod, and four frost heave sensors respectively installed on the outer surface of the frost heave meter connecting rod, and the distance between any two adjacent frost heave sensors is 600mm-1500mm;

[0022] After the first frost heave sensor group, the second frost heave sensor group and the third frost heave sensor group are buried, the uppermost frost heave sensors are all 600mm-800mm away from the roadbed surface.

[0023] In some preferred embodiments, the first moisture sensor group and the second moisture sensor group respectively include a moisture sensor connecting rod, and four moisture sensors respectively installed on the outer surface of the moisture sensor connecting rod, and the distance between any two adjacent moisture sensors is 600mm-1500mm;

[0024] After the first moisture sensor group and the second moisture sensor group are buried, the uppermost moisture sensors are both 600 mm to 800 mm away from the roadbed surface.

[0025] In some preferred embodiments, the water level hole has a depth of 5000mm-8000mm.

[0026] Beneficial Effects

[0027] The utility model realizes the automatic collection of roadbed frost heave deformation data through the cooperation of multiple types and groups of sensors, which greatly improves the monitoring efficiency and data accuracy, reduces the errors and labor intensity of manual operations, provides comprehensive data support for analyzing the causes and trends of frost heave phenomena, provides a scientific basis for the prevention and control of roadbed frost heave, helps engineers take timely measures to prevent or reduce the impact of frost heave, and helps to extend the service life of the roadbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the connection relationship of various components of an automatic monitoring device for frost heave deformation of a high-speed railway subgrade with a filling type of a cutting in a preferred embodiment of the utility model;

[0029] Figure 2It is a schematic diagram of the arrangement relationship of various components of an automatic monitoring device for frost heave deformation of a high-speed railway subgrade with a filling type of a cutting in a preferred embodiment of the utility model;

[0030] Figure 3 This is a schematic diagram of the connection relationship of various components of the automatic monitoring device for frost heave deformation of a high-speed railway subgrade with an embankment as a filling type in a preferred embodiment of the utility model;

[0031] Figure 4 It is a schematic diagram of the arrangement relationship of various components of an automatic monitoring device for frost heave deformation of a high-speed railway subgrade with an embankment as a filling type in a preferred embodiment of the utility model;

[0032] In the figure: 1. The first geothermal sensor group; 2. The second geothermal sensor group; 3. The first frost heave sensor group; 4. The second frost heave sensor group; 5. The third frost heave sensor group; 6. The first moisture sensor group; 7. The second moisture sensor group; 8. Data acquisition equipment; 9. Power supply equipment; 10. Water level sensor. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described below in conjunction with the accompanying drawings. In the description of the utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0034] Example 1

[0035] like Figure 1-Figure 2 As shown, this embodiment provides an automatic monitoring device for frost heave deformation of a high-speed railway subgrade with a filling type of a cutting, comprising:

[0036] The first geothermal sensor group 1 is vertically buried at the center of the road cutting line; the second geothermal sensor group 2 is vertically buried at the side ditch platform of the road cutting; the first geothermal sensor group 1 and the second geothermal sensor group 2 respectively include a plurality of geothermal sensors arranged at intervals.

[0037] It should be noted that the road cutting refers to the roadbed formed by digging the ground to maintain the level or slope of the road surface when building roads, railways or other transportation routes. It usually appears in places with high or uneven terrain. By digging out materials such as soil and rocks, the ground is lowered to the required design height. Road cutting enables roads or railways to maintain a relatively flat direction, reduce slope changes, and help improve the driving stability and safety of vehicles.

[0038] The cutting line center refers to the central position of the cutting cross section. In railway or road engineering, the cutting line center is an important design and construction reference point used to determine the width, depth and symmetry of the cutting. The cutting side ditch platform usually refers to the horizontal or near-horizontal surface above the side ditch excavated next to the cutting for drainage.

[0039] The ground temperature refers to the temperature at a certain depth on the ground or underground. At different depths and geographical locations, the ground temperature will vary due to factors such as solar radiation, atmospheric conditions, surface cover, soil type and water content. In alpine areas, changes in ground temperature have an important impact on the formation and melting of permafrost, the growth of surface vegetation, and the stability of geological structures. Therefore, when constructing and maintaining infrastructure such as railway subgrades in alpine seasonally frozen areas, monitoring and analyzing ground temperature changes is crucial to understanding and controlling ground frost heave and its impact on structures.

[0040] The geothermal sensor is a device used to measure the temperature of the soil or a certain depth underground. It usually consists of a temperature sensing element, a data processing and transmission unit, and can accurately monitor and record ground temperature changes. The geothermal sensor can be buried vertically or horizontally at different depths underground to continuously monitor the time series data of ground temperature.

[0041] The first frost heave sensor group 3 is vertically buried near the center of the cutting line; the second frost heave sensor group 4 is vertically buried at the left center line of the cutting; the third frost heave sensor group 5 is vertically buried near the inner side of the cable trough of the left and right shoulders of the cutting; the first frost heave sensor group 3, the second frost heave sensor group 4 and the third frost heave sensor group 5 respectively include a plurality of frost heave sensors arranged at intervals.

[0042] It should be noted that the frost heave sensor is a device used to monitor and measure the volume expansion of soil or rock caused by freezing of water due to a drop in temperature. When the water in the soil or rock turns into ice during the freezing process, its volume increases, which puts pressure on the surrounding structure. This phenomenon is called frost heave. Frost heave sensors can detect this volume change or related pressure changes, thereby providing data for assessing and managing potential risks caused by frost heave. Frost heave sensors are usually installed below the ground, especially in frozen soil layers or potential frozen soil layers, to monitor the dynamic changes of frost heave in real time.

[0043] The left center line of a cutting refers to the center line on the left side of the cutting cross section. In railway engineering, cuttings usually have a symmetrical cross-sectional shape, and the left center line of the cutting is the center axis of the left part of this symmetrical shape. This line helps guide the symmetry control and measurement work during the cutting construction process, ensuring that the structure and design of the cutting are accurately implemented as planned. Specifically, in the construction of railways, the left center line of the cutting and the right center line of the cutting jointly define the width and shape of the cutting. When conducting topographic surveys, designs, and construction, engineers will use these center lines to ensure the symmetry and accuracy of the cutting, thereby ensuring the smoothness and stability of the subsequent railway or road.

[0044] The cable trough on the left and right shoulders of the road cutting refers to the grooves for laying cables set up on the left and right shoulders of the road cutting. It is located on the outermost side of the road cutting structure, close to the slope or shoulder of the road cutting, and is used to accommodate and protect cables and other communication lines.

[0045] The first moisture sensor group 6 is vertically buried near the first frost heave sensor group 3; the second moisture sensor group 7 is vertically buried near the third frost heave sensor group 5; the first moisture sensor group 6 and the second moisture sensor group 7 respectively include a plurality of moisture content sensors arranged at intervals.

[0046] It should be noted that a moisture sensor is a device used to measure the moisture content of soil, air, or other materials. Moisture sensors usually measure the moisture content of the soil at the measured point through changes in capacitance, resistance, conductivity, or other physical properties, because these properties change with changes in moisture levels. For example, the conductivity of soil increases as the water content increases, and moisture sensors can use this to determine the moisture content of the soil.

[0047] The data acquisition device 8 is electrically connected to each temperature sensor group, each frost heave sensor group and each moisture sensor group. It should be noted that the data acquisition device 8 of the utility model realizes the collection and aggregation of the data collected by each sensor on the one hand, and transmits the aggregated data to the back-end data processing device through at least one of wired and wireless signal transmission on the other hand. The data acquisition device 8 is a common electronic device in this field, and its specific specification signal can be selected and set by those skilled in the art according to the actual situation and needs on the site.

[0048] The power supply device 9 is electrically connected to each temperature sensor group, each frost heave sensor group, each moisture sensor group and the data acquisition device 8. Preferably, the power supply can be provided by a storage battery.

[0049] In some preferred embodiments, a water level sensor 10 is provided at the bottom of the water level hole at the side ditch platform of the road cutting to realize real-time automatic collection of water level data.

[0050] Example 2

[0051] like Figure 3-4 As shown, this embodiment provides an automatic monitoring device for frost heave deformation of a high-speed railway subgrade for embankment filling type, including:

[0052] The first ground temperature sensor group 1 is vertically buried in the inner side of the cable trough near the left and right shoulders of the embankment; the first ground temperature sensor group 1 includes a plurality of ground temperature sensors arranged at intervals.

[0053] It should be noted that an embankment is an artificial earth-rock structure built to raise the road surface above the surrounding ground. It usually appears in low-lying areas and is used to raise the ground to the required height by filling soil, stones and other materials to maintain the level of the road surface or meet the designed slope requirements. Embankments can provide a stable roadbed to ensure traffic safety, while also helping to drain water and prevent flooding.

[0054] The first frost heave sensor group 3 is vertically buried near the center of the embankment line; the second frost heave sensor group 4 is vertically buried at the left center line of the embankment; the third frost heave sensor group 5 is vertically buried near the inner side of the cable trough on the left and right shoulders of the embankment; the first frost heave sensor group 3, the second frost heave sensor group 4 and the third frost heave sensor group 5 respectively include a plurality of frost heave sensors arranged at intervals.

[0055] The first moisture sensor group 6 is vertically buried near the first frost heave sensor group 3; the second moisture sensor group 7 is vertically buried near the third frost heave sensor group 5; the first moisture sensor group 6 and the second moisture sensor group 7 respectively include a plurality of moisture content sensors arranged at intervals.

[0056] The data acquisition device 8 is electrically connected to each temperature sensor group, each frost heave sensor group and each moisture sensor group respectively.

[0057] The power supply device 9 is electrically connected to each temperature sensor group, each frost heave sensor group, each moisture sensor group and the data acquisition device 8 respectively.

[0058] In some preferred embodiments, a water level sensor 10 is provided at the bottom of the water level hole at the side ditch platform of the road cutting to realize real-time automatic collection of water level data.

[0059] Example 3

[0060] This embodiment is developed on the basis of the above-mentioned embodiment 1 or 2. This embodiment considers collecting data of the same cross section of the roadbed to reflect the situation at the cross section, and then reflects the situation of the target roadbed based on the data of at least one such cross section. Therefore, in some preferred embodiments, the first geothermal sensor group 1, the second geothermal sensor group 2, the first frost heave sensor group 3, the second frost heave sensor group 4, the third frost heave sensor group 5, the first moisture sensor group 6 and the second moisture sensor group 7 are all arranged on the same cross section of the high-speed railway roadbed. Obviously, when the automatic monitoring device for frost heave deformation of the high-speed railway roadbed in some preferred embodiments includes a water level sensor 10, the water level sensor 10 should be arranged on the same cross section as the above-mentioned sensor group.

[0061] Furthermore, the installation location and spacing of the automatic monitoring device for frost heave deformation of high-speed railway subgrade need to be determined according to the specific engineering background, geographical environment, climatic conditions and monitoring purpose. First of all, priority should be given to installing monitoring sections in areas where frost heave is the most serious and typical, such as: the yin and yang slopes of the subgrade; the connection between the subgrade and structures such as abutments and culverts; areas with significant changes in groundwater levels; and the junction of subgrade excavation and filling. Secondly, the impact of terrain changes on frost heave should be considered, such as low-lying areas prone to water accumulation, slope tops and slope toes. At the same time, sections that are found to be significantly deformed during manual measurement and that can represent the general characteristics of subgrade frost heave in the area are selected for monitoring. In cold areas, the impact range of frost heave is large, and the spacing between monitoring sections can be appropriately increased; while in mild areas, the impact of frost heave is small, and the spacing can be relatively small. Different subgrade structures have different sensitivities to frost heave. Where the structure changes greatly, the spacing between monitoring sections should be appropriately reduced. For ordinary roadbeds, the monitoring section spacing can be set to 50-100 meters; in areas where frost heave is particularly severe, the spacing can be reduced to 20-50 meters; for particularly important projects, or situations where high-precision monitoring is required, the spacing can be further reduced. If the purpose is to study the laws of frost heave in detail, the section spacing should be smaller in order to obtain detailed data; if it is only for engineering control, the spacing can be appropriately increased. The above specific setting method can be set by those skilled in the art according to the actual situation and needs of the site, and the utility model does not make further requirements.

[0062] Example 4

[0063] This embodiment further describes the specific use method of any of the above embodiments 1-3:

[0064] 1. Installation of ground temperature sensor group:

[0065] 1. Install geothermal sensors on the outer surfaces of the first geothermal sensor connecting rod and the second geothermal sensor connecting rod. The first geothermal sensor group 1 for the cutting includes 15 geothermal sensors, and the second geothermal sensor group 2 for the embankment includes 10 geothermal sensors. The distance between any two adjacent geothermal sensors is 200 mm;

[0066] 2. Drill a hole at the target burial location, place the first geothermal sensor group 1 and the second geothermal sensor group 2 in the hole, backfill with the pre-prepared roadbed filler that is the same as the roadbed filling, and tamp with a core hammer; after each geothermal sensor group is buried, the top geothermal sensor is 100mm-150mm away from the roadbed surface.

[0067] 3. Arrange and prepare the outgoing and routing cables of all sensors, and connect the cables to the data acquisition device 8 and the power supply device 9 respectively.

[0068] 2. Installation of frost heave sensor group:

[0069] 1. Four frost heave sensors are respectively installed on the outer surface of the frost heave sensor connecting rod to complete the assembly of the first frost heave sensor group 3, the second frost heave sensor group 4 and the third frost heave sensor group 5, and the distance between any two adjacent frost heave sensors is 600 mm-1500 mm;

[0070] 2. Drill holes at the target burying positions, place the first frost heave sensor group 3, the second frost heave sensor group 4 and the third frost heave sensor group 5 in the holes, backfill with pre-prepared roadbed fillers that are the same as the roadbed filling, and tamp with a core hammer; after each frost heave sensor group is buried, the uppermost frost heave sensor is 600mm-800mm away from the roadbed surface.

[0071] 3. Arrange and prepare the outgoing and routing cables of all sensors, and connect the cables to the data acquisition device 8 and the power supply device 9 respectively.

[0072] 3. Installation of moisture sensor group:

[0073] 1. Install four moisture sensors on the outer surface of the moisture sensor connecting rod to complete the assembly of the first moisture sensor group 6 and the second moisture sensor group 7. The distance between any two adjacent moisture sensors is 600 mm to 1500 mm.

[0074] 2. Drill holes at the target burial location, place the first moisture sensor group 6 and the second moisture sensor group 7 in the holes, backfill with the pre-prepared roadbed filler that is the same as the roadbed filler, and tamp with a core hammer; after each moisture sensor group is buried, the uppermost moisture sensor is 600mm-800mm away from the roadbed surface.

[0075] In some preferred embodiments, the water level sensor 10 is also used, specifically including:

[0076] 4. Installation of water level sensor 10:

[0077] 1. Drill a hole at the target burial location and place a water level pipe with matching diameter in the hole;

[0078] 2. Place a water level sensor 10 at the bottom of the water level pipe, and backfill with the pre-prepared roadbed filler that is the same as the roadbed filler, and tamp it with a core hammer;

[0079] 3. Arrange and prepare the outgoing and routing cables of the water level sensor 10, and connect the cables to the data acquisition device 8 and the power supply device 9 respectively.

[0080] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. High-speed railway roadbed frost heave deformation automatic monitoring device, characterized in that: include: A first ground temperature sensor group (1) is vertically buried in the center of the cutting line or in the inner side of the cable trough near the left and right shoulders of the embankment; The second geothermal sensor group (2) is vertically buried at the platform of the side ditch of the road cutting; the first geothermal sensor group (1) and the second geothermal sensor group (2) respectively include a plurality of geothermal sensors arranged at intervals; The first frost heave sensor group (3) is vertically buried near the center of the cutting line or near the center of the embankment line; the second frost heave sensor group (4) is vertically buried at the left center line of the cutting or at the left center line of the embankment; the third frost heave sensor group (5) is vertically buried near the inner side of the cable trough of the left and right shoulders of the cutting or near the inner side of the cable trough of the left and right shoulders of the embankment; the first frost heave sensor group (3), the second frost heave sensor group (4) and the third frost heave sensor group (5) respectively include a plurality of frost heave sensors arranged at intervals; A first moisture sensor group (6) is vertically buried near the first frost heave sensor group (3); a second moisture sensor group (7) is vertically buried near the third frost heave sensor group (5); the first moisture sensor group (6) and the second moisture sensor group (7) respectively include a plurality of moisture content sensors arranged at intervals; Data acquisition equipment (8) is electrically connected to each temperature sensor group, each frost heave sensor group and each moisture sensor group respectively; The power supply device (9) is electrically connected to each temperature sensor group, each frost heave sensor group, each moisture sensor group and the data acquisition device (8) respectively.

2. The automatic monitoring device for frost heave deformation of high-speed railway subgrade according to claim 1, characterized in that: Also includes: A water level sensor (10) is arranged at the bottom of a water level hole at a side ditch platform of a road cutting or at the foot of a road embankment.

3. The automatic monitoring device for frost heave deformation of high-speed railway subgrade according to claim 1, characterized in that: The first ground temperature sensor group (1), the second ground temperature sensor group (2), the first frost heave sensor group (3), the second frost heave sensor group (4), the third frost heave sensor group (5), the first moisture sensor group (6) and the second moisture sensor group (7) are all arranged on the same cross section of the high-speed railway roadbed.

4. The automatic monitoring device for frost heave deformation of high-speed railway subgrade according to claim 2, characterized in that: The first ground temperature sensor group (1), the second ground temperature sensor group (2), the first frost heave sensor group (3), the second frost heave sensor group (4), the third frost heave sensor group (5), the first moisture sensor group (6), the second moisture sensor group (7) and the water level sensor (10) are all arranged on the same cross section of the high-speed railway roadbed.

5. The automatic monitoring device for frost heave deformation of high-speed railway subgrade according to claim 1, characterized in that: The first geothermal sensor group (1) comprises a first geothermal sensor connecting rod, and 15 geothermal sensors respectively mounted on the outer surface of the first geothermal sensor connecting rod, wherein the distance between any two adjacent geothermal sensors is 200 mm; After the first ground temperature sensor group (1) is buried, the top ground temperature sensor is 100 mm to 150 mm away from the roadbed surface.

6. The automatic monitoring device for frost heave deformation of high-speed railway subgrade according to claim 1, characterized in that: The second geothermal sensor group (2) comprises a second geothermal sensor connecting rod, and 10 geothermal sensors respectively mounted on the outer surface of the second geothermal sensor connecting rod, wherein the distance between any two adjacent geothermal sensors is 200 mm; After the second ground temperature sensor group (2) is buried, the top ground temperature sensor is 100 mm to 150 mm away from the roadbed surface.

7. The automatic monitoring device for frost heave deformation of high-speed railway subgrade according to claim 1, characterized in that: The first frost heave sensor group (3), the second frost heave sensor group (4) and the third frost heave sensor group (5) respectively comprise a frost heave sensor connecting rod and four frost heave sensors respectively mounted on the outer surface of the frost heave sensor connecting rod, and the distance between any two adjacent frost heave sensors is 600 mm-1500 mm; After the first frost heave sensor group (3), the second frost heave sensor group (4) and the third frost heave sensor group (5) are buried, the uppermost frost heave sensors are all 600 mm to 800 mm away from the roadbed surface.

8. The automatic monitoring device for frost heave deformation of high-speed railway subgrade according to claim 1, characterized in that: The first moisture sensor group (6) and the second moisture sensor group (7) respectively include a moisture sensor connecting rod and four moisture sensors respectively installed on the outer surface of the moisture sensor connecting rod, and the distance between any two adjacent moisture sensors is 600 mm-1500 mm; After the first moisture sensor group (6) and the second moisture sensor group (7) are buried, the uppermost moisture sensors are both 600 mm to 800 mm away from the roadbed surface.

9. The automatic monitoring device for frost heave deformation of high-speed railway subgrade according to claim 2, characterized in that: The water level hole has a depth of 5000mm-8000mm.

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