A method for measuring disturbance deformation of tunnels based on vertical underpass

Abstract

The invention discloses a method for measuring the disturbance deformation of a tunnel based on vertical underpass, and the deformation measurement method has the following steps: step one: determining the tunnel positioning line before the disturbance; step two: arranging test sections with a spacing of 3-5m along the axis of the upper existing tunnel; step three: arranging a target on the vault of each monitoring section; step four: setting a positioning block fixed by an expansion bolt at the bottom of each monitoring section; step five: designing a device for measuring the displacement of the tunnel axis; step six: during the deformation of the tunnel, the position of the irradiation point of the laser on the measuring panel will change; step seven: the horizontal convergence deformation of the tunnel can be determined by measuring the change in the distance between two horizontal measuring points of each test section by a convergence meter; step eight: designing a device for positioning and measuring the settlement deformation of the tunnel vault; step nine: determining the settlement change of the upper tunnel vault during the disturbance. The invention is of great significance for reducing construction risks and ensuring the safety of existing tunnel operations.

Description

Technical Field

[0001] The invention relates to a method for measuring disturbance deformation of an upper existing tunnel when a lower tunnel is vertically underpassed, in particular to a method for measuring disturbance deformation of a tunnel. Background Art

[0002] With the continuous development of my country's economy and the gradual increase in the scale of urbanization, the development and utilization of underground space has become an important direction of urban construction. There are not only dense surface buildings in the city, but also various underground structures, such as underground pipelines, tunnels, subway stations, and integrated pipe corridors. Under the background of urban underground space development in my country, underground engineering construction inevitably produces disturbance deformation problems on adjacent buildings (structures). Among them, the orthogonal underpass of new tunnels through existing power or traffic tunnels is a common form of crossing. The construction of new tunnels will cause deformation of the surrounding soil, and will also induce disturbance deformation of the upper tunnel, which will not only cause the overall axial deformation of the tunnel (axis offset), but also cause deformation of the tunnel structure itself. Conventional tunnel deformation monitoring only measures the convergence deformation of the tunnel body during construction (vault settlement, side wall convergence, etc.), and does not involve the simultaneous overall axial deformation of the tunnel and the convergence deformation of the structure body.

[0003] From the above records, we can know that the measurement method of tunnel deformation caused by vertical underpass construction disturbance encountered in municipal underground engineering construction, and the exploration of the longitudinal displacement of the tunnel axis and the internal clearance convergence deformation are of great significance to reducing construction risks and ensuring the safety of existing tunnel operations;

[0004] Therefore, it is urgent to design a tunnel disturbance deformation measurement method based on vertical underpass. Summary of the invention

[0005] The object of the present invention is to provide a method for measuring disturbance deformation of a tunnel based on vertical underpass to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for measuring the disturbance deformation of a tunnel based on vertical underpass, wherein the steps of the deformation measurement method are as follows:

[0008] Step 1: Determine the tunnel location line before disturbance;

[0009] Step 2: Arrange test sections with a spacing of 3-5m along the axis of the existing upper tunnel, and monitor the 45° soil slip line on both sides of the lower tunnel;

[0010] Step 3: Place a target on the top of each monitoring section, and place two deformation measuring points, point 1 and point 2, at the same elevation on both sides of the wall;

[0011] Step 4: Set a positioning block (iron block) fixed by expansion bolts at the bottom of each monitoring section, with a positioning hole in the center;

[0012] Step 5: Design a device for measuring the displacement of the tunnel axis;

[0013] Step 6: During the deformation of the tunnel, the position of the laser irradiation point on the measurement panel will change. A target is set at the irradiation point, and the target is accurately positioned by pasting it. The horizontal and vertical displacements of the tunnel axis can be determined based on the geometric relationship between the two points.

[0014] Step 7: The horizontal convergence deformation of the tunnel can be determined by measuring the distance change between two horizontal measuring points of each test section through the convergence meter;

[0015] Step 8: Design a device for positioning and measuring the settlement and deformation of the tunnel vault. The bottom of the device is a positioning pin, the size of which matches the positioning hole of the positioning block; the upper part is connected to the outer cover device of the handheld laser rangefinder by a spherical connection;

[0016] Step 9: The laser rangefinder of each monitoring section can measure the change in the distance between the arch target and the bottom positioning block to determine the change in the settlement of the upper tunnel arch during the disturbance process.

[0017] As a further solution of the present invention: the specific steps in step 1 are as follows:

[0018] S1: Before the vertical underpass tunnel construction, a point is selected as a fixed point inside the existing tunnel above and outside the disturbed area;

[0019] S2: Fix a laser locator and emit a laser beam to the disturbed side of the tunnel, with the height from the ground equal to the tunnel axis, as the tunnel positioning line before the disturbance.

[0020] As a further solution of the present invention: in the step five, the bottom of the device is connected to the positioning hole of the positioning block by a positioning pin, the positioning pin matches the hole size, and the upper part is provided with a support rod and a measuring panel.

[0021] As a further solution of the present invention: the data of multiple monitoring sections in step six can determine the displacement of the entire tunnel axis.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention can detect the longitudinal displacement of the tunnel axis and the internal clearance convergence deformation, which is of great significance for reducing construction risks and ensuring the safety of existing tunnel operations;

[0024] 2. The method of the present invention can not only measure the displacement of the axis of the upper tunnel during the vertical penetration of the lower tunnel, but also measure the convergence deformation of the tunnel body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of deformation based on the tunnel disturbance deformation measurement method of vertical underpass.

[0026] Figure 2 Schematic diagram of the structure of the tunnel disturbance deformation measurement method based on vertical underpass.

[0027] Figure 3 It is a structural schematic diagram of the monitoring range in the tunnel disturbance deformation measurement method based on vertical underpass.

[0028] Figure 4 Schematic diagram of the end face structure in the tunnel disturbance deformation measurement method based on vertical underpass.

[0029] Figure 5 This is a schematic diagram of the structure of the positioning block in the tunnel disturbance deformation measurement method based on vertical underpass.

[0030] Figure 6 It is a structural schematic diagram of the tunnel disturbance deformation measurement method based on vertical underpass.

[0031] Figure 7 Schematic diagram of deformation displacement in the tunnel disturbance deformation measurement method based on vertical underpass.

[0032] Figure 8 Schematic diagram of the installation structure of the laser rangefinder in the tunnel disturbance deformation measurement method based on vertical underpass. DETAILED DESCRIPTION

[0033] 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.

[0034] See also Figures 1 to 8 In an embodiment of the present invention, a method for measuring deformation of a tunnel disturbance based on vertical underpass is provided, and the steps of the deformation measurement method are as follows:

[0035] Step 1: Determine the tunnel location line before disturbance;

[0036] Step 2: Arrange test sections with a spacing of 3-5m along the axis of the existing upper tunnel, and monitor the 45° soil slip line on both sides of the lower tunnel;

[0037] Step 3: Arrange a target on the top of each monitoring section, and arrange two deformation measuring points, point 1 and point 2, at the same elevation on both sides of the wall. Points 1 and 2 are fixed hooks buried in the cave wall, and the length between the two points is measured with a convergence ruler;

[0038] Step 4: Set a positioning block (iron block) fixed by expansion bolts at the bottom of each monitoring section, with a positioning hole in the center;

[0039] Step 5: Design a device for measuring the displacement of the tunnel axis;

[0040] Step 6: During the deformation of the tunnel, the position of the laser irradiation point on the measurement panel will change. A target is set at the irradiation point, and the target is accurately positioned by pasting it. The horizontal and vertical displacements of the tunnel axis can be determined based on the geometric relationship between the two points.

[0041] Step 7: The horizontal convergence deformation of the tunnel can be determined by measuring the distance change between two horizontal measuring points of each test section through the convergence meter;

[0042] Step 8: Design a device for positioning and measuring the settlement and deformation of the tunnel vault. The bottom of the device is a positioning pin, the size of which matches the positioning hole of the positioning block; the upper part is connected to the outer cover device of the handheld laser rangefinder by a spherical connection;

[0043] Step 9: The laser rangefinder of each monitoring section can measure the change in the distance between the arch target and the bottom positioning block to determine the change in the settlement of the upper tunnel arch during the disturbance process.

[0044] The specific steps in step one are as follows:

[0045] S1: Before the vertical underpass tunnel construction, a point is selected as a fixed point inside the existing tunnel above and outside the disturbed area;

[0046] S2: A laser locator is fixed to emit a laser beam to the disturbed side of the tunnel, with the height from the ground equal to the tunnel axis, which serves as the tunnel positioning line before the disturbance;

[0047] In the step 5, the bottom of the device is connected to the positioning hole of the positioning block by a positioning pin, the positioning pin matches the hole size, and the upper part is provided with a support rod and a measuring panel;

[0048] The data from multiple monitoring sections in step six can determine the displacement of the entire tunnel axis.

[0049] The method of the present invention can not only measure the displacement of the axis of the upper tunnel during the vertical penetration of the lower tunnel, but also measure the convergence deformation of the tunnel body.

[0050] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for measuring disturbance deformation of a tunnel based on vertical underpass, characterized in that: The deformation measurement method steps are as follows: Step 1: Determine the tunnel location line before disturbance; Step 2: Arrange test sections with a spacing of 3-5m along the axis of the existing upper tunnel; Step 3: Place a target on the top of each monitoring section, and place two deformation measuring points, point 1 and point 2, at the same elevation on both sides of the wall; Step 4: Set a positioning block fixed by expansion bolts at the bottom of each monitoring section. The positioning block is an iron block with a positioning hole in the center; Step 5: Design a device for measuring the displacement of the tunnel axis; Step 6: During the overall deformation of the tunnel, the position of the laser irradiation point on the measurement panel will change. The positioning target can be accurately positioned by pasting it. The horizontal and vertical displacements of the tunnel axis at the test section can be determined based on the geometric relationship between the two points. Step 7: The horizontal convergence deformation of the tunnel can be determined by measuring the distance change between two horizontal measuring points of each test section through the convergence meter; Step 8: Design a device for positioning and measuring the settlement and deformation of the tunnel vault, with a positioning pin at the bottom of the device; Step 9: The vertical laser rangefinder of each monitoring section can measure the change in the distance between the arch target and the bottom positioning block to determine the change in the settlement of the upper tunnel arch during the disturbance process.

2. The method for measuring disturbance deformation of a tunnel based on vertical underpass according to claim 1 is characterized in that: The specific steps in step one are as follows: S1: Before the vertical underpass tunnel construction, a point is selected as a fixed point inside the existing tunnel above and outside the disturbed area; S2: Fix a laser locator and emit a laser beam to the disturbed side of the tunnel, with the height from the ground equal to the tunnel axis, as the tunnel positioning line before the disturbance.

3. The method for measuring disturbance deformation of a tunnel based on vertical underpass according to claim 1 is characterized in that: In the step 5, the bottom of the device is connected to the positioning hole of the positioning block by a positioning pin, the positioning pin matches the hole size, and the upper part is provided with a support rod and a measuring panel.

4. The method for measuring disturbance deformation of a tunnel based on vertical underpass according to claim 1 is characterized in that: The data from the multiple monitoring sections in step six can determine the displacement of the entire tunnel axis and can also be used to measure the convergence deformation inside the tunnel.

5. The method for measuring disturbance deformation of a tunnel based on vertical underpass according to claim 1 is characterized in that: The monitoring range in step 2 is the 45° soil slip line range on both sides of the lower crossing tunnel.

6. The method for measuring disturbance deformation of a tunnel based on vertical underpass according to claim 1 is characterized in that: In the step eight, the size thereof matches the positioning hole of the positioning block; the upper part is spherically connected to the vertical handheld laser rangefinder jacket device, and the rangefinder can rotate in all directions.

7. The method for measuring disturbance deformation of a tunnel based on vertical underpass according to claim 1 is characterized in that: In the step 3, measuring points 1 and 2 are fixed hooks embedded in the cave wall, and a convergence ruler is used to measure the length between the two points.

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