Early warning device for high-speed railway roadbed slope landslide and application method

Abstract

The invention discloses an early warning device for high-speed railway roadbed slope landslide and an application method. The early warning device comprises a strain box, a connecting rod, a positioner and a data processor. The strain box internally comprises a supporting rod, a stand column and a vibrating wire strain gauge; the four supporting rods are fixedly combined into a cross shape and are respectively connected with the four vibrating wire type strain gauges, and the other end of each vibrating wire type strain gauge is connected with the connecting rod; and the vibrating wire strain gauge is connected with the data processor through a data line. The strain box is composed of an upper top, a lower bottom and side walls, and the side walls define a cylindrical shape. The positioner is a circular flat plate, and annular ribs are arranged in the flat plate. The longitudinal direction of the vibrating wire strain gauge A is perpendicular to the longitudinal direction of the line and is close to the road surface, and the longitudinal directions of the other vibrating wire strain gauges are clockwise and sequentially rotated by 90 degrees. The application steps are as follows: (1) selecting an area where the early warning device is arranged; (2) excavating a side slope soil body according to requirements; (3) installing the early warning device in place, burying the early warning device into the slope and starting to operate; and (4) early warning is carried out according to specific conditions in the operation process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of early warning of high-speed railway subgrade slope landslide. BACKGROUND

[0002] The landslide of high-speed railway subgrade slope has great harm to high-speed railway, and the landslide may cause hidden trouble to train safety, or even cause the surface subsidence and inclination of subgrade, thus causing train accident and interrupting train operation. Especially for high-speed railway, the small subsidence of subgrade surface may cause very serious accident.

[0003] In recent years, the precipitation in northwest China shows a clear increasing trend, which makes the original treatment measures of subgrade landslide difficult to play an effective role. Especially for some high fill loess subgrade, the possibility of landslide is further increased. In this case, the early warning of high-speed railway subgrade slope landslide is particularly important, and there is no suitable railway subgrade landslide early warning equipment at present. The existing early warning equipment is usually based on displacement change early warning equipment of satellite positioning, which requires an open view to receive satellite signals, and the recognition accuracy of displacement change also does not meet the requirements, so it is difficult to identify the slight displacement change before landslide. At the same time, the equipment higher than the slope cannot exist on the high-speed railway subgrade slope, which makes many devices unable to be applied. Therefore, a device that can be buried in the subgrade slope and can effectively early warn the high-speed railway subgrade slope landslide is urgently needed. SUMMARY

[0004] The purpose of the present application is to provide a device for early warning of high-speed railway subgrade slope landslide, that is, to early warn the railway subgrade slope landslide by monitoring the slight crack development caused by the slight slope slip before the subgrade landslide occurs.

[0005] The present application is an early warning device and application method for high-speed railway subgrade slope landslide. The early warning device for high-speed railway subgrade slope landslide comprises a strain box 1, a connecting rod 2, a positioner 3, and a data processor 4. The strain box 1 contains a support rod 5, a vertical column 6, and a vibrating wire strain gauge 7. Four support rods 5 are fixed into a cross, and are connected with four vibrating wire strain gauges 7 respectively. The other end of each vibrating wire strain gauge 7 is connected with the connecting rod 2. The vibrating wire strain gauge 7 is connected with the data processor 4 through a data line 8.

[0006] The application method of the above-mentioned early warning device for high-speed railway subgrade slope landslide comprises the following steps: (1) Select the area where the early warning device is arranged, and determine the number and position of the early warning device; (2) Excavate the slope soil, and excavate a cylindrical pit along the direction perpendicular to the slope surface; (3) After the early warning device is assembled, it is installed into the soil body, the axial direction of the upwardly directed connecting rod 2 is perpendicular to the longitudinal direction of the line, and the vibrating wire strain gauges 7 are numbered in sequence; (4) The power supply is connected, the data processor 4 is turned on, and the working conditions of the data processor 4, the data line 8 and the vibrating wire strain gauge 7 are checked; (5) After the early warning device is suitable, the power supply is turned off, the strain box 1, the connecting rod 2 and the positioner 3 are buried, and the slope is restored to the condition before excavation. The data processor 4 is not buried in the soil, but is placed on the surface of the slope with a stable base; (6) The power supply is turned on, and the working performance of the early warning device is checked again. After no error is found, the early warning device starts to work normally; (7) The data of the data processor 4 of the early warning device is collected and analyzed regularly, and the collection and analysis times are increased in special cases. When the data is abnormal, timely analysis and processing are carried out, and the early warning is carried out to take measures to control and process the possible landslide of the roadbed.

[0007] The beneficial effects of the present application are: by monitoring the subtle dynamics of the crack development before the landslide of the high-speed railway roadbed, analyzing the causes and possible conditions of the landslide, and timely warning to take measures to prevent the occurrence of landslide, which has important significance. The structure of the present patent is relatively simple, practical and has significant economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a plan view of a roadbed slope landslide early warning device, Figure 2 is a plan view of the internal structure of a strain box, Figure 3 is an elevation view of the internal structure of a strain box, Figure 4 is a front elevation view of a positioner, Figure 5 is a vibrating wire strain gauge arrangement in a strain box, Figure 6 is a crack development schematic view, Figure 7 is a crack calculation schematic view. DETAILED DESCRIPTION

[0009] The present application is an early warning device for the landslide of a high-speed railway roadbed slope, as shown in Figures 1-3 , comprising a strain box 1, a connecting rod 2, a positioner 3 and a data processor 4. The strain box 1 contains a support rod 5, a column 6 and a vibrating wire strain gauge 7. Four support rods 5 are fixed into a cross, and are connected to four vibrating wire strain gauges 7 respectively. The other end of each vibrating wire strain gauge 7 is connected to the connecting rod 2. The vibrating wire strain gauge 7 is connected to the data processor 4 through a data line 8.

[0010] As shown in Figure 2 , Figure 3As shown, the strain gauge 1 consists of an upper top 1-1, a lower bottom 1-2, and a side wall 1-3. The side wall 1-3 is cylindrical and has a circular hole A 1-4 for the data cable 8 to pass through. The upper top 1-1 and the lower bottom 1-2 protrude outward, which can increase the internal space of the strain gauge 1 on the one hand, and reduce the resistance when the strain gauge 1 slides along the plane of the connecting rod 2 on the other hand.

[0011] like Figure 3 As shown, the column 6 and the support rod 5 inside the strain chamber 1 are fixed together in a cross shape and are perpendicular to the plane of the cross. The top of the column 6 supports the upper top 1-1 and the lower bottom 1-2 of the strain chamber, respectively. Four circular holes B 1-5 are provided on the side wall of the strain chamber in mutually perpendicular directions for the passage and movement of the connecting rod 2.

[0012] like Figure 1 , Figure 2 , Figure 4 As shown, the locator 3 is a circular plate with annular ribs 3-1 inside to increase the adhesion between the plate and the surrounding soil. The main function of the locator 3 is to form a whole with the surrounding soil so that the strain value can be measured when soil cracking occurs between the two locators 3. The strain value can be transmitted to the data processor 4 via the data line 8 for strain data processing.

[0013] like Figures 5-7 As shown, the longitudinal direction of vibrating wire strain gauge A 7-1 is perpendicular to the longitudinal direction of the track 9 and close to the road surface. The longitudinal directions of vibrating wire strain gauges B 7-2, C 7-3, and D 7-4 are rotated 90° clockwise sequentially. After the slope crack 10 formed before the landslide, the strain value of vibrating wire strain gauge A 7-1 was... ε 11 The strain value of the vibrating wire strain gauge B7-2 is ε 21 The strain value of the vibrating wire strain gauge C7-3 is ε 12 The strain value of the vibrating wire strain gauge D7-4 is ε 22 The average strain perpendicular to the longitudinal direction of the track is: ε 1=( ε 11 + ε 11 ) / 2, the displacement change value is: l 1= l 0 ε 1. The average strain parallel to the longitudinal direction of the track is ε 2=( ε 21 + ε 22 ) / 2, the displacement change value is:l 2= l 0 ε 2, the crack development width is: l = l 0×( ε 1 2 + ε 2 2 ) 1 / 2 , wherein, l 0 is the length of the vibrating wire strain gauge. The angle between the crack development direction line 11 and the longitudinal direction of the line is: α =arctan( ε 2 / ε 1). The data processor 4 analyzes the development of the crack and the development direction to determine whether to issue a warning and take appropriate landslide control measures.

[0014] The application method of the early warning device for high-speed railway subgrade slope landslide described above has the following specific steps: (1) Select the area where the early warning device is arranged, and determine the number and position of the early warning device; (2) Excavate the slope soil, excavate a cylindrical pit in the direction perpendicular to the slope surface, and the diameter and depth of the pit are preferably 20 cm deep from the top of the positioner 3 of the early warning device that can be placed down and the positioner 3 of the early warning device; (3) Assemble the early warning device, then install it into the soil, make the axial direction of the upward direction connecting rod 2 perpendicular to the longitudinal direction of the line, and sequentially number the vibrating wire strain gauges 7; (4) Connect the power supply, turn on the data processor 4, and check the working condition of the data processor 4, data line 8, and vibrating wire strain gauge 7; (5) After the early warning device is suitable, turn off the power supply, bury the strain box 1, connecting rod 2, and positioner 3, and restore the slope to the condition before excavation. The data processor 4 is not buried in the soil, but is placed on the slope surface with a stable base; (6) Turn on the power supply, check the working performance of the early warning device again, and if there is no error, the early warning device starts normal work; (7) Collect and analyze the data of the data processor 4 of the early warning device regularly, and increase the collection and analysis times in special cases. When the data is abnormal, analyze and process it in time, and issue a warning to take measures to control and process the possible landslide of the subgrade.

Claims

1. A warning device for high-speed railway subgrade slope landslide, comprising a strain box (1), a connecting rod (2), a positioner (3), and a data processor (4), characterized in that The strain box (1) comprises a support rod (5), a column (6) and a vibrating wire strain gauge (7). The four support rods (5) are fixed into a cross, and are connected with the four vibrating wire strain gauges (7) respectively. The other end of each vibrating wire strain gauge (7) is connected with the connecting rod (2). The vibrating wire strain gauges (7) are connected with the data processor (4) through data lines (8).

2. The early warning device for high-speed railway subgrade slope landslide according to claim 1, characterized in that The strain box (1) is composed of an upper top (1-1), a lower bottom (1-2) and a side wall (1-3). The side wall (1-3) is in the shape of a cylinder, and the side wall (1-3) is provided with a circular hole A (1-4) for the data lines (8) to pass through. The upper top (1-1) and the lower bottom (1-2) are outwardly convex.

3. The early warning device for high-speed railway subgrade slope landslide according to claim 1, characterized in that The column (6) in the strain box (1) is fixed with the cross formed by the support rods (5), and is perpendicular to the cross plane. The top end of the column (6) supports the upper top (1-1) and the lower bottom (1-2) of the strain box respectively. Four circular holes B (1-5) are arranged on the side wall of the strain box in perpendicular directions.

4. The early warning device for high-speed railway subgrade slope landslide according to claim 1, characterized in that The positioner (3) is a circular flat plate, and the flat plate is provided with annular ribs (3-1). The strain value can be transmitted to the data processor (4) through the data lines (8).

5. The early warning device for high-speed railway subgrade slope landslide according to claim 1, characterized in that The longitudinal direction of the vibrating wire strain gauge A (7-1) is perpendicular to the line longitudinal direction (9) and close to the road surface, the longitudinal direction of the vibrating wire strain gauge B (7-2), the vibrating wire strain gauge C (7-3) and the vibrating wire strain gauge D (7-4) is rotated 90° clockwise in turn; after the slope crack (10) before the landslide is generated, the strain value of the vibrating wire strain gauge A (7-1) is ε 11 , the strain value of the vibrating wire strain gauge B (7-2) is ε 21 , the strain value of the vibrating wire strain gauge C (7-3) is ε 12 , and the strain value of the vibrating wire strain gauge D (7-4) is ε 22 ; the average strain value perpendicular to the line longitudinal direction is ε 1=( ε 11 + ε 11 ) / 2, the displacement change value is: l 1= l 0 ε 1, the average strain value parallel to the line longitudinal direction is ε 2=( ε 21 + ε 22 ) / 2, the displacement change value is: l 2= l 0 ε 2, and the crack development width is: l = l 0×( ε 1 2 + ε 2 2 ) 1 / 2 , wherein, l 0 is the length of the vibrating wire strain gauge; the included angle between the crack development direction line (11) and the line longitudinal direction is: α =arctan( ε 2 / ε 1). The data processor (4) judges whether to give a warning to take corresponding landslide control measures by calculating and analyzing the crack development condition and development direction.

6. The application method of the early warning device for high-speed railway subgrade slope landslide according to claim 1, characterized in that, The steps are as follows: Step (1): select the area where the early warning device is arranged, and determine the number and position of the early warning device; Step (2): excavate the soil body of the slope, and excavate a cylindrical pit along the direction perpendicular to the slope surface; Step (3): assemble the early warning device, and then install it into the soil body, so that the axial direction of the upward connecting rod (2) is perpendicular to the longitudinal direction of the line, and the vibrating wire strain gauges (7) are numbered in turn; Step (4): connect the power supply, turn on the data processor (4), and check the working condition of the data processor (4), the data lines (8) and the vibrating wire strain gauges (7); Step (5): after the early warning device is suitable, turn off the power supply, bury the strain box (1), the connecting rod (2) and the positioner (3), and restore the slope to the condition before excavation. The data processor (4) is not buried in the soil, but is placed on the surface of the slope with a stable base; Step (6): turn on the power supply, and check the working performance of the early warning device again. After no error is found, the early warning device starts to work normally; Step (7): collect and analyze the data of the data processor (4) of the early warning device regularly, and increase the collection and analysis times in special cases; When the data is abnormal, analyze and process it in time, and give a warning to take measures to control and process the possible landslide of the roadbed.

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