Tunnel monitoring device and method based on vault subsidence and periphery convergence

Abstract

The invention discloses a tunnel monitoring device based on vault subsidence and periphery convergence, and the device comprises a plurality of subsidence monitoring devices which are disposed at the center and two sides of the vault of a to-be-detected tunnel section at intervals in the width direction of a tunnel, and the height positions of monitoring points of any subsidence monitoring device are the same; the multiple sets of convergence monitoring devices are arranged at intervals in the height direction of the tunnel, and any set of convergence monitoring devices comprises two convergence monitoring devices which are oppositely arranged at the two ends of any horizontal measuring line of the section of the tunnel to be measured; the sinking monitoring device and the convergence monitoring device both adopt monitoring units. The positions of the sinking monitoring device and the convergence monitoring device are reasonably arranged, and the stable monitoring structure of the monitoring unit is matched, so that the stability of connection between the monitoring point and the tunnel is greatly improved, and the tunnel construction efficiency, the deformation monitoring accuracy and the construction safety are ensured.

Description

Technical Field

[0001] The present invention relates to the field of tunnel engineering monitoring, and more specifically, to a tunnel monitoring device and method based on arch sinking and perimeter convergence. Background Art

[0002] Deformation monitoring is an indispensable part of tunnel engineering and an important means to ensure the safety of tunnel engineering. At present, deformation monitoring inside the tunnel is usually achieved by setting multiple monitoring points on the tunnel construction section and monitoring the displacement of the monitoring points through a total station. In actual construction, the monitoring points are generally installed on the initial support layer of the tunnel. Affected by the subsequent construction of the tunnel and the construction disturbance of the adjacent construction sections, the installed monitoring points are prone to severe shaking, loose connection structures, deformation, etc., resulting in large errors in monitoring data, insufficient accuracy and reliability, etc. The repeated disassembly and repeated measurement of the monitoring points are also likely to seriously affect the monitoring efficiency and the timeliness of deformation data acquisition, thereby affecting construction safety.

[0003] In order to solve the above problems, it is necessary to design a tunnel monitoring device and method based on arch sinking and peripheral convergence to improve the stability of the connection between the monitoring point and the tunnel, and to ensure the tunnel construction efficiency, deformation monitoring accuracy and construction safety. Summary of the invention

[0004] The purpose of the present invention is to provide a tunnel monitoring device and method based on arch crown sinking and peripheral convergence. By rationally arranging the positions of the sinking monitoring device and the convergence monitoring device and cooperating with the stable monitoring structure of the monitoring unit, the stability of the connection between the monitoring point and the tunnel is greatly improved, thereby ensuring the tunnel construction efficiency, deformation monitoring accuracy and construction safety.

[0005] In order to achieve these objects and other advantages according to the present invention, a tunnel monitoring device based on vault sinking and perimeter convergence is provided, comprising: A plurality of sinking monitoring devices are arranged at intervals along the tunnel width direction at the center of the vault of the tunnel section to be measured and on both sides thereof, and the height positions of the monitoring points of any sinking monitoring device are the same; Multiple groups of convergence monitoring devices are arranged at intervals along the height direction of the tunnel, and any group of convergence monitoring devices includes two convergence monitoring devices, which are relatively arranged at the two ends of any horizontal measuring line of the tunnel section to be measured; The sinking monitoring device and the convergence monitoring device both adopt a monitoring unit, which includes: a detection rod, one end of which cooperates to pass through a preset installation hole on the support layer and is anchored in the surrounding rock layer, and the other end extends outward from the installation hole, and a grouting hole is provided at the outer end of the detection rod, and grouting holes are provided at intervals on the side walls of the detection rod located in the support layer and the inner section of the surrounding rock layer, and each grouting hole is connected to the grouting hole through a grouting channel inside the detection rod; a reflection device, which is fixed on the outer side wall of the end of the detection rod extending out of the installation hole; A total station is set on the tunnel floor and used to measure the coordinates of the reflection devices of each monitoring unit.

[0006] Preferably, in the tunnel monitoring device based on vault sinking and peripheral convergence, the monitoring unit also includes a protective shell, which is a hollow structure with a single-sided opening, wherein the opening is opposite to the orifice of the mounting hole and is fixed on the supporting layer, the protective shell cover is arranged on the outer end portion of the detection rod and the inner side wall is tightly fitted and pressed against the outer end face of the detection rod, and an observation window is provided on the side of the protective shell adjacent to the total station.

[0007] Preferably, in the tunnel monitoring device based on arch sinking and peripheral convergence, the protective shell is fixed to the supporting layer by anchors on all sides.

[0008] Preferably, when the tunnel monitoring device based on arch crown sinking and peripheral convergence injects grout into the outlet holes located in the supporting layer through the grouting holes, the grouting material is the shotcrete used in the construction of the supporting layer.

[0009] Preferably, in the tunnel monitoring device based on the vault sinking and the peripheral convergence, the sinking monitoring device is arranged along the tunnel height direction, and the convergence monitoring device is arranged along the tunnel width direction.

[0010] The present invention also provides a monitoring method of the tunnel monitoring device based on the arch sinking and peripheral convergence, comprising the following steps: S1. Install multiple sinking monitoring devices and multiple sets of convergence monitoring devices on the tunnel section to be tested according to the designed position, and install a total station at a position directly opposite to the tunnel section; S2. Read and record the coordinates of the reflector of each monitoring unit according to the set period, calculate the settlement amount and relative settlement rate of each settlement monitoring point, the convergence amount and relative convergence rate of each settlement monitoring point relative to the tunnel centerline, the convergence amount and relative convergence rate of each group of convergence monitoring points, and the settlement amount and relative settlement rate of each convergence monitoring point; S3, according to the distance between the tunnel section to be measured and the excavation surface and the position of each monitoring point on the tunnel section, the settlement threshold and the convergence threshold of each monitoring point are set and controlled accordingly; S4. According to the burial depth of each monitoring point, the relative sinking rate and relative convergence rate of the corresponding monitoring point are controlled.

[0011] Preferably, the monitoring method of the tunnel monitoring device based on vault sinking and peripheral convergence, in S2, also includes: drawing a curve of the settlement data of the current tunnel section changing with the distance between the monitoring point and the center line according to the settlement amount of each sinking monitoring point and each convergence monitoring point, and judging the overall settlement of the current tunnel section based on this; drawing a curve of the convergence data of the current tunnel section changing with the height of the monitoring point according to the convergence amount of each sinking monitoring point and each group of convergence monitoring points, and judging the overall convergence of the current tunnel section based on this.

[0012] Preferably, in the monitoring method of the tunnel monitoring device based on the arch crown sinking and the peripheral convergence, in S3, the method of setting the settlement threshold and the convergence threshold of each monitoring point includes: S31, determining the maximum allowable subsidence displacement and convergence displacement of different characteristic points on the tunnel section according to the tunnel design parameters; S32. Measure the distance between the current tunnel section and the excavation surface as the control distance. When the control distance is greater than twice the tunnel excavation width, the settlement threshold and convergence threshold of each monitoring point shall take the corresponding maximum allowable settlement displacement and convergence displacement; when the control distance is less than or equal to twice the tunnel excavation width and greater than the tunnel excavation width, the settlement threshold and convergence threshold of each monitoring point shall take 90% of the corresponding maximum allowable settlement displacement and convergence displacement; when the control distance is less than or equal to the tunnel excavation width, the settlement threshold and convergence threshold of each monitoring point shall take 65% of the corresponding maximum allowable settlement displacement and convergence displacement.

[0013] Preferably, in the monitoring method of the tunnel monitoring device based on vault subsidence and peripheral convergence, in S4, when the buried depth of the monitoring point is greater than twice the sum of the tunnel excavation height and the tunnel excavation width, a three-level control is adopted for the relative subsidence rate of the monitoring point; when the buried depth of the monitoring point is less than or equal to twice the sum of the tunnel excavation height and the tunnel excavation width and greater than the sum of the tunnel excavation height and the tunnel excavation width, a two-level control is adopted for the relative subsidence rate of the monitoring point; when the buried depth of the monitoring point is less than or equal to the sum of the tunnel excavation height and the tunnel excavation width, a first-level control is adopted for the relative subsidence rate of the monitoring point; the control threshold of the relative convergence rate of each monitoring point is positively correlated with the control threshold of the relative subsidence rate.

[0014] The present invention has at least the following beneficial effects: 1. The present invention solves the problems in the prior art that the monitoring device cannot penetrate into the surrounding rock layer, the connection stability is insufficient, the monitoring efficiency is low due to repeated installation, and the monitoring result is not accurate enough by reasonably arranging the positions of the sinking monitoring device and the convergence monitoring device and cooperating with the stable monitoring structure of the monitoring unit; 2. The present invention simultaneously calculates and graded controls the settlement amount and relative settlement rate, convergence amount and relative convergence rate of each monitoring point, which can better judge the settlement and convergence of the current tunnel section in combination with the actual construction situation, further ensuring the accuracy of the monitoring results and the safety of construction.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the arrangement structure of a tunnel monitoring device based on arch sinking and perimeter convergence according to an embodiment of the present invention; Figure 2 Schematic diagram of the installation structure of the monitoring unit described in the above embodiment.

[0017] Description of reference numerals: 11. Detection rod; 12. Protective shell; 13. Anchor; 14. Reflection device; 2. Support layer; 3. Surrounding rock layer; 4. Sinking monitoring device; 5. Convergence monitoring device. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0019] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the 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 present invention.

[0020] like Figure 1-2 As shown, the present invention provides a tunnel monitoring device based on arch sinking and perimeter convergence, comprising: A plurality of sinking monitoring devices 4 are arranged at intervals along the tunnel width direction at the center of the vault of the tunnel section to be measured and on both sides thereof, and the height positions of the monitoring points of any sinking monitoring device 4 are the same; A plurality of groups of convergence monitoring devices 5 are arranged at intervals along the height direction of the tunnel, and any group of convergence monitoring devices includes two convergence monitoring devices 5, which are relatively arranged at the two ends of any horizontal measuring line of the tunnel section to be measured; The sinking monitoring device 4 and the convergence monitoring device 5 both adopt monitoring units, which include: a detection rod 11, one end of which cooperates to pass through a preset installation hole on the support layer 2 and is anchored in the surrounding rock layer 3, and the other end protrudes outward from the installation hole, and a grouting hole is provided at the outer end of the detection rod 11, and grouting holes are provided at intervals on the side walls of the detection rod 11 located in the inner section of the support layer 2 and the surrounding rock layer 3, and each grouting hole is connected to the grouting hole through the grouting channel inside the detection rod 11; a reflection device 14, which is fixed on the outer side wall of the end of the detection rod 11 protruding from the installation hole; A total station is arranged on the tunnel floor and is used to measure the coordinates of the reflection device 14 of each monitoring unit.

[0021] In the above technical solution, the detection rod can be anchored layer by layer in the surrounding rock layer and the supporting layer by grouting different grouting holes, and the total station monitors the settlement and convergence displacement of the installation position of the corresponding monitoring unit by detecting the coordinate change of the center point of the reflection device located at the outer end of the detection rod. The reflection device can be a conventional measurement component such as a reflection plate and a reflection prism.

[0022] After the construction is completed, the section of the monitoring unit extending out of the support layer can be directly cut, and the remaining monitoring unit structure can be left in the tunnel structure as a reinforcement structure, saving the steps of disassembling the monitoring unit and re-anchoring, further ensuring construction efficiency.

[0023] In another technical solution, the tunnel monitoring device based on vault sinking and peripheral convergence, the monitoring unit also includes a protective shell 12, which is a hollow structure with a single-sided opening, and its opening is opposite to the orifice of the mounting hole and is fixed on the supporting layer, the protective shell 12 is covered on the outer end of the detection rod 11 and the inner side wall is tightly fitted and pressed against the outer end face of the detection rod 11, and an observation window is provided on the side of the protective shell 12 adjacent to the total station.

[0024] The observation window is a detachable structure covering the range of the reflective device. When no measurement is performed, the protective shell forms a closed structure on the outside of the detection rod to protect the detection rod. When measurement is required, the observation window can be opened to smoothly perform total station monitoring. In addition, if the monitoring unit is installed on the initial support layer of the tunnel, the length of the detection rod extending out of the mounting hole can be selected according to the designed lining thickness. Thus, during the construction of the secondary lining, the protective shell can be used as a protective template to protect the detection rod. After the construction of the secondary lining is completed, the protective shell can be directly disassembled to expose the intact reflective device to the lining layer so that subsequent monitoring work can be carried out smoothly and efficiently.

[0025] In another technical solution, in the tunnel monitoring device based on the vault sinking and peripheral convergence, the protective shell 12 is fixed to the supporting layer 2 by anchors 13 on all sides. The anchors can be anchor rods, which pass through the reserved holes on the protective shell and are anchored into the supporting layer, and the setting direction of the anchor rods is parallel to the axis of the detection rod.

[0026] In another technical solution, the tunnel monitoring device based on arch crown sinking and peripheral convergence, when grouting is performed through the grouting holes to the outlet holes located in the supporting layer, the grouting material is the shotcrete used in the construction of the supporting layer.

[0027] In the above technical solution, grouting is first performed through the grouting hole into the (detection rod) outlet hole in the surrounding rock layer. At this time, concrete or mud with properties similar to those of the surrounding rock is used. After the pores in the surrounding rock are filled, the sprayed concrete is injected into the outlet hole in the supporting layer, so that the detection rod can be better connected with the tunnel structure of each layer, thereby strengthening the connection and detection stability of the monitoring unit.

[0028] In another technical solution, the tunnel monitoring device based on vault sinking and peripheral convergence, the sinking monitoring device is arranged along the tunnel height direction, and the convergence monitoring device is arranged along the tunnel width direction, which is conducive to the rapid reading and processing of settlement and convergence data.

[0029] The present invention also provides a monitoring method of the tunnel monitoring device based on the arch sinking and peripheral convergence, comprising the following steps: S1. Install multiple sinking monitoring devices 4 and multiple groups of convergence monitoring devices 5 on the tunnel section to be tested according to the designed position, and install a total station at a position directly opposite to the tunnel section; S2. Read and record the coordinates of the reflector of each monitoring unit according to the set period, calculate the settlement amount and relative settlement rate of each settlement monitoring point, the convergence amount and relative convergence rate of each settlement monitoring point relative to the tunnel centerline, the convergence amount and relative convergence rate of each group of convergence monitoring points, and the settlement amount and relative settlement rate of each convergence monitoring point; S3, according to the distance between the tunnel section to be measured and the excavation surface and the position of each monitoring point on the tunnel section, the settlement threshold and the convergence threshold of each monitoring point are set and controlled accordingly; S4. According to the burial depth of each monitoring point, the relative sinking rate and relative convergence rate of the corresponding monitoring point are controlled.

[0030] In the above technical solution, the center point of the reflector of each sinking monitoring device is the sinking measurement point, the installation position of each sinking monitoring device on the tunnel section is the sinking monitoring point, the center point of the reflector of each convergence monitoring device is the convergence measurement point, and the installation position of each convergence monitoring device on the tunnel section is the convergence monitoring point. The settlement and convergence of each sinking measurement point are the same as those of the corresponding sinking monitoring point, but the actual coordinates of the monitoring point need to be converted when calculating the relative sinking rate and the relative convergence rate; similarly, the settlement and convergence of each convergence measurement point are the same as those of the corresponding convergence monitoring point, but the actual coordinates of the monitoring point need to be converted when calculating the relative sinking rate and the relative convergence rate. Specifically, the relative sinking rate is the ratio of the settlement of the current monitoring point to the setting height of the monitoring point in the tunnel section, and the relative convergence rate is the ratio of the convergence of a group of monitoring points (corresponding to the change in the distance between two monitoring points) to the design distance between the two corresponding monitoring points (i.e., the length of the corresponding horizontal measurement line). In S2, the coordinate changes of the sinking monitoring points and the convergence monitoring points are used to calculate their non-target monitoring values. This can enrich the monitoring data in the entire tunnel section without increasing the number of monitoring points, and provide more complete reference data for the judgment of the tunnel vault sinking and the surrounding convergence conditions. It is worth noting that when calculating the convergence amount and relative convergence rate of each sinking monitoring point relative to the tunnel centerline, the sinking monitoring point located at the center of the vault needs to be excluded. The convergence amount and relative convergence rate of other sinking monitoring points can be approximately calculated by the coordinate difference between the sinking measurement point and the sinking measurement point located at the center of the vault, that is, the ratio of "the change in the horizontal spacing between the target sinking monitoring point and the sinking monitoring point located at the center of the vault" to "the designed spacing between the target sinking monitoring point and the tunnel centerline" is calculated, and it is used as the relative convergence rate at the sinking monitoring point; in addition, when calculating the convergence amount of each sinking monitoring point, twice the change in the horizontal spacing between the target sinking monitoring point and the sinking monitoring point located at the center of the vault needs to be taken as the corresponding convergence value.

[0031] In another technical solution, the monitoring method of the tunnel monitoring device based on vault sinking and peripheral convergence, in S2, also includes: drawing a curve of the settlement data of the current tunnel section as the distance between the monitoring point and the center line changes according to the settlement amount of each sinking monitoring point and each convergence monitoring point, and judging the overall settlement of the current tunnel section based on this; drawing a curve of the convergence data of the current tunnel section as the height of the monitoring point changes according to the convergence amount of each sinking monitoring point and each group of convergence monitoring points, and judging the overall convergence of the current tunnel section based on this.

[0032] In another technical solution, in the monitoring method of the tunnel monitoring device based on arch settlement and peripheral convergence, in S3, the method of setting the settlement threshold and convergence threshold of each monitoring point includes: S31, determining the maximum allowable subsidence displacement and convergence displacement of different characteristic points on the tunnel section according to the tunnel design parameters; S32. Measure the distance between the current tunnel section and the excavation surface as the control distance. When the control distance is greater than twice the tunnel excavation width, the settlement threshold and convergence threshold of each monitoring point shall take the corresponding maximum allowable settlement displacement and convergence displacement; when the control distance is less than or equal to twice the tunnel excavation width and greater than the tunnel excavation width, the settlement threshold and convergence threshold of each monitoring point shall take 90% of the corresponding maximum allowable settlement displacement and convergence displacement; when the control distance is less than or equal to the tunnel excavation width, the settlement threshold and convergence threshold of each monitoring point shall take 65% of the corresponding maximum allowable settlement displacement and convergence displacement.

[0033] In another technical solution, in the monitoring method of the tunnel monitoring device based on vault subsidence and peripheral convergence, in S4, when the buried depth of the monitoring point is greater than twice the sum of the tunnel excavation height and the tunnel excavation width, a three-level control is adopted for the relative subsidence rate of the monitoring point; when the buried depth of the monitoring point is less than or equal to twice the sum of the tunnel excavation height and the tunnel excavation width and greater than the sum of the tunnel excavation height and the tunnel excavation width, a two-level control is adopted for the relative subsidence rate of the monitoring point; when the buried depth of the monitoring point is less than or equal to the sum of the tunnel excavation height and the tunnel excavation width, a first-level control is adopted for the relative subsidence rate of the monitoring point; the control threshold of the relative convergence rate of each monitoring point is positively correlated with the control threshold of the relative subsidence rate.

[0034] The buried depth of the monitoring point is the distance from the monitoring point to the ground surface along the tunnel height direction. The control values ​​of the relative subsidence rate and relative convergence rate of the monitoring point are all design values. From the third-level control to the second-level control and the first-level control, the control range of the corresponding relative subsidence rate is gradually narrowed due to the gradual decrease of the buried depth of the monitoring point. The control threshold of the relative convergence rate of each monitoring point is the control threshold of the corresponding relative subsidence rate multiplied by the set conversion coefficient, which is a fixed value of the design.

[0035] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A tunnel monitoring device based on vault sinking and perimeter convergence, characterized in that: include: A plurality of sinking monitoring devices are arranged at intervals along the tunnel width direction at the center of the vault of the tunnel section to be measured and on both sides thereof, and the height positions of the monitoring points of any sinking monitoring device are the same; Multiple groups of convergence monitoring devices are arranged at intervals along the height direction of the tunnel, and any group of convergence monitoring devices includes two convergence monitoring devices, which are relatively arranged at the two ends of any horizontal measuring line of the tunnel section to be measured; The sinking monitoring device and the convergence monitoring device both adopt a monitoring unit, which includes: a detection rod, one end of which cooperates to pass through a preset installation hole on the support layer and is anchored in the surrounding rock layer, and the other end extends outward from the installation hole, and a grouting hole is provided at the outer end of the detection rod, and grouting holes are provided at intervals on the side walls of the detection rod located in the support layer and the inner section of the surrounding rock layer, and each grouting hole is connected to the grouting hole through a grouting channel inside the detection rod; a reflection device, which is fixed on the outer side wall of the end of the detection rod extending out of the installation hole; A total station is set on the tunnel floor and used to measure the coordinates of the reflection devices of each monitoring unit.

2. The tunnel monitoring device based on vault sinking and perimeter convergence according to claim 1, characterized in that: The monitoring unit also includes a protective shell, which is a hollow structure with a single-sided opening, wherein the opening is opposite to the orifice of the mounting hole and is fixed on the supporting layer. The protective shell cover is arranged on the outer end of the detection rod and the inner side wall is tightly fitted and pressed against the outer end surface of the detection rod. An observation window is provided on the side of the protective shell adjacent to the total station.

3. The tunnel monitoring device based on vault sinking and perimeter convergence according to claim 1, characterized in that: The protective shell is fixed on the supporting layer by anchoring pieces on all sides.

4. The tunnel monitoring device based on vault sinking and perimeter convergence according to claim 1, characterized in that: When grouting is performed through the grouting holes into the grouting holes in the supporting layer, the grouting material is the shotcrete used in the construction of the supporting layer.

5. The tunnel monitoring device based on vault sinking and perimeter convergence according to claim 1, characterized in that: The sinking monitoring device is arranged along the height direction of the tunnel, and the convergence monitoring device is arranged along the width direction of the tunnel.

6. The monitoring method of the tunnel monitoring device based on the arch sinking and peripheral convergence according to claim 1, characterized in that: The following steps are involved: S1. Install multiple sinking monitoring devices and multiple sets of convergence monitoring devices on the tunnel section to be tested according to the designed position, and install a total station at a position directly opposite to the tunnel section; S2. Read and record the coordinates of the reflector of each monitoring unit according to the set period, calculate the settlement amount and relative settlement rate of each settlement monitoring point, the convergence amount and relative convergence rate of each settlement monitoring point relative to the tunnel centerline, the convergence amount and relative convergence rate of each group of convergence monitoring points, and the settlement amount and relative settlement rate of each convergence monitoring point; S3, according to the distance between the tunnel section to be measured and the excavation surface and the position of each monitoring point on the tunnel section, the settlement threshold and the convergence threshold of each monitoring point are set and controlled accordingly; S4. According to the burial depth of each monitoring point, the relative sinking rate and relative convergence rate of the corresponding monitoring point are controlled.

7. The monitoring method of the tunnel monitoring device based on the arch sinking and peripheral convergence according to claim 6 is characterized in that: S2 also includes: drawing a curve showing how the settlement data of the current tunnel section changes with the distance between the monitoring point and the center line according to the settlement amount of each sinking monitoring point and each convergence monitoring point, and judging the overall settlement of the current tunnel section based on this; drawing a curve showing how the convergence data of the current tunnel section changes with the height of the monitoring point according to the convergence amount of each sinking monitoring point and each group of convergence monitoring points, and judging the overall convergence of the current tunnel section based on this.

8. The monitoring method of the tunnel monitoring device based on the arch sinking and peripheral convergence according to claim 6, characterized in that: In S3, the method for setting the settlement threshold and convergence threshold of each monitoring point includes: S31, determining the maximum allowable subsidence displacement and convergence displacement of different characteristic points on the tunnel section according to the tunnel design parameters; S32. Measure the distance between the current tunnel section and the excavation surface as the control distance. When the control distance is greater than twice the tunnel excavation width, the settlement threshold and convergence threshold of each monitoring point shall take the corresponding maximum allowable settlement displacement and convergence displacement; when the control distance is less than or equal to twice the tunnel excavation width and greater than the tunnel excavation width, the settlement threshold and convergence threshold of each monitoring point shall take 90% of the corresponding maximum allowable settlement displacement and convergence displacement; when the control distance is less than or equal to the tunnel excavation width, the settlement threshold and convergence threshold of each monitoring point shall take 65% of the corresponding maximum allowable settlement displacement and convergence displacement.

9. The monitoring method of the tunnel monitoring device based on the arch sinking and peripheral convergence according to claim 6, characterized in that: In S4, when the buried depth of the monitoring point is greater than twice the sum of the tunnel excavation height and the tunnel excavation width, the relative subsidence rate of the monitoring point is subject to three-level control; when the buried depth of the monitoring point is less than or equal to twice the sum of the tunnel excavation height and the tunnel excavation width and greater than the sum of the tunnel excavation height and the tunnel excavation width, the relative subsidence rate of the monitoring point is subject to two-level control; when the buried depth of the monitoring point is less than or equal to the sum of the tunnel excavation height and the tunnel excavation width, the relative subsidence rate of the monitoring point is subject to one-level control; the control threshold of the relative convergence rate of each monitoring point is positively correlated with the control threshold of the relative subsidence rate.

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