A testing method for the entire life cycle of surrounding rock in subsea tunnels based on ultragravity geocentrifuge technology

Abstract

This invention discloses a testing method for the entire life cycle of surrounding rock in subsea tunnels based on hypergravity geocentrifugation technology. First, a model box is constructed to simulate the subsea tunnel and its surrounding rock structure at a scale. Then, the model box is placed in a vacuum chamber for saturation treatment. Finally, the model box is removed from the vacuum chamber and placed in a hypergravity geocentrifuge. The centrifuge is then started, and strain sensors collect the strain of the rock layer near the scaled-down tunnel pipe in real time, thereby observing the nonlinear elastic deformation of the rock layer throughout its entire life cycle during the operation of the train track simulation mechanism. This invention, by constructing a model box to simulate the subsea tunnel and its surrounding rock structure and conducting testing and analysis based on hypergravity geocentrifugation technology, significantly accelerates the evolution process of damage to the subsea tunnel and its surrounding rock structure, shortens the experimental cycle, and rapidly tests and determines the changes throughout its entire life cycle.

Description

Technical Field

[0001] This invention relates to the field of simulation and testing technology for submarine shield tunnels, specifically a testing method for the entire life cycle of surrounding rock in submarine tunnels based on ultragravity geocentrifuge technology. Background Technology

[0002] Due to their high construction costs, long operating cycles, and difficult and expensive maintenance, the structural design of undersea shield tunnels must fully consider the performance evolution of their lining structure and surrounding rock system throughout their entire life cycle. Current methods rely on statistical analysis of historical data to study this evolution; however, the available historical data is limited, and the statistical research is incomplete, making it unsuitable for analyzing the performance evolution of the surrounding rock throughout the entire life cycle of undersea tunnels. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a testing method for the entire life cycle of the surrounding rock of the submarine tunnel based on the supergravity geocentrifuge technology. By constructing a model box to simulate the submarine tunnel and its surrounding rock structure, and conducting testing and analysis based on the supergravity geocentrifuge technology, the method can significantly accelerate the evolution process of damage to the submarine tunnel and its surrounding rock structure, shorten the experimental cycle, and quickly test and determine the changes throughout its entire life cycle.

[0004] The technical solution of this invention is as follows:

[0005] A testing method for the entire life cycle of surrounding rock in subsea tunnels based on ultragravity geocentrifuge technology, specifically including the following steps:

[0006] (1) Construct a model box. The model box includes a box body, a wave-absorbing layer, a rock layer, seawater, a tunnel tapered pipe, a strain sensor, and a train track simulation mechanism. The wave-absorbing layer includes a wave-absorbing plate whose outer surface is completely covered and fixedly connected to the inner wall and bottom plate of the box body, and multiple wave-absorbing strips with a sawtooth shape that are covered and fixedly connected to the inner surface of the wave-absorbing plate. The long axis of the wave-absorbing strips is parallel to the long side of the box body. Multiple wave-absorbing strips on the inner wall of the box body are arranged in parallel vertically and completely cover the inner surface of the wave-absorbing plate. Multiple wave-absorbing strips on the bottom plate of the box body are arranged in parallel along the width direction of the box body and completely cover the top surface of the wave-absorbing plate. The rock layer is located in the lower part of the box body, and the seawater is located in the upper part of the box body, that is, directly above the rock layer. The tunnel tapered pipe is located in the rock layer and extends along the long side of the box body. The train track simulation mechanism is located in the tunnel tapered pipe, and the strain sensor is located in the rock layer near the tunnel tapered pipe.

[0007] (2) Place the model box in a vacuum chamber for saturation treatment. A vibration platform is set up in the vacuum chamber. The model box is placed on the vibration platform. While the vacuum is being drawn, the vibration platform vibrates at a low frequency.

[0008] (3) After the vacuuming is completed, the model box is taken out from the vacuum box and placed in the basket of the supergravity geocentrifuge. Then the supergravity geocentrifuge is started. After the supergravity geocentrifuge runs smoothly, the train track simulation mechanism in the model box is started. The strain sensor collects the strain of the rock layer near the tunnel tapered pipe in real time, so as to observe the nonlinear elastic deformation of the rock layer throughout the entire life cycle during the operation of the train track simulation mechanism.

[0009] The tunnel tapering pipe is located at the center of the rock layer in the width direction. The width of the rock layer inside the box is L1, and the outer diameter of the tunnel tapering pipe is L2. The ratio of the two satisfies the following relationship: L1>k1×L2, where the value of k1 is 4.2 to 5.9.

[0010] The multiple wave-absorbing strips on the inner wall of the enclosure have right-angled triangular cross-sections. One right-angled outer surface of the wave-absorbing strip is a vertical plane, and the other right-angled outer surface is a horizontal plane. The vertical plane of the wave-absorbing strip is fixedly connected to the inner surface of the wave-absorbing layer plate. The wave-absorbing strips above the horizontal centerline of the tunnel tapered pipe have their horizontal planes facing upwards, and the wave-absorbing strips below the horizontal centerline of the tunnel tapered pipe have their horizontal planes facing downwards. The multiple wave-absorbing strips on the bottom plate of the enclosure have isosceles triangular cross-sections. The bottom surface of the wave-absorbing strips is fixedly connected to the top surface of the wave-absorbing layer plate, and the apex of the wave-absorbing strips faces upwards. Multiple bottom support strips with semi-circular cross-sections are also fixedly connected to the bottom surface of the wave-absorbing layer plate on the bottom plate of the enclosure. The multiple bottom support strips are arranged parallel to each other along the width direction of the enclosure and completely cover the bottom surface of the wave-absorbing layer plate. The top plane of the bottom support strips is fixedly connected to the bottom surface of the wave-absorbing layer plate.

[0011] The microwave absorbing layer and microwave absorbing strip are both made of polyurethane porous foam, and the bottom support strip is made of ferrite rubber.

[0012] The width of the horizontal plane of each absorbing strip on the inner wall of the box and the height of each absorbing strip on the bottom plate of the box are both L3. The height of the vertical plane of each absorbing strip on the inner wall of the box, the width of the bottom surface of each absorbing strip on the bottom plate of the box, and the diameter of each bottom support strip are all L4. The ratio of the two satisfies the following relationship: L4=k2×L3. Under a centrifugal force of 100g, the value of k2 is 0.41~0.62. Under a centrifugal force of 100-300g, the value of k2 is 0.51~0.72.

[0013] The strain sensor used is a Bragg fiber grating strain sensor.

[0014] The train track simulation mechanism includes a slide rail extending along the long axis of the tunnel tapered pipe, a slider slidably mounted on the slide rail, a load loading mechanism mounted on the slider, and a control mechanism for driving the slider to move along the slide rail and regulating the load loading mechanism.

[0015] When the model box is placed in a vacuum chamber for saturation treatment, the vacuuming time T satisfies the following formula (1):

[0016] T = k3 × V1 / P (1);

[0017] In equation (1), V1 represents the internal volume of the vacuum chamber, P represents the vacuum pressure, and k3 is the harmonic coefficient, with a value of M·L. -4 ·T -1 M·L -4 ·T -1 In this context, M represents a unit of mass, L represents a unit of length, and T represents a unit of time.

[0018] During the vacuuming process, the vibration frequency of the vibration platform is 0.2 to 1 Hz.

[0019] The strain sensor collects the strain of the rock layer near the tunnel tapered pipe in real time, and calculates the stress load σ borne by the rock near the tunnel tapered pipe by the following formula (2);

[0020]

[0021] In equation (2), ε is the strain of the rock layer near the tunnel tapered pipe collected in real time by the strain sensor; E1 is the theoretical modulus of the rock layer, which is a constant; E2 is the modulus of the rock layer after disturbance and fracturing, which is a constant; H is 0.86 to 1.32; t is time; n is the multiple of the gravitational acceleration g under hypergravity environment after the hypergravity geocentrifuge is started; and k4 is 0.12 to 1.25.

[0022] Then the stress load σ calculated by equation (2) is compared with the average yield stress σ of the rock layer. y Compare;

[0023] When σ < σ y At that time, the rock near the tunnel tapered pipe had not reached the fatigue acceleration node, and the stress load σ satisfied the following equation (3):

[0024]

[0025] In equation (3), the value of k5 ranges from 0.23 to 1.32; The first derivative of the stress load σ; ε is the first derivative of the dependent variable ε; w1 is the viscosity coefficient of the rock layer in the first stage to be solved;

[0026] When v≥σ y At that time, the rock near the tunnel tapered pipe enters the accelerated fatigue stage, and the stress load σ satisfies the following equation (4):

[0027]

[0028] In equation (4), the value of k6 is 1.23 to 1.68; w2 is the viscosity coefficient of the second stage of the rock layer to be solved, namely the acceleration stage.

[0029] Advantages of this invention:

[0030] (1) This invention uses the technology of hypergravity scaling and time-lapse to simulate the submarine tunnel and its surrounding rock structure by constructing a model box. The tunnel scaling pipe and train track simulation mechanism are set in the rock layer to simulate the operation process of the submarine tunnel and establish the process of high-frequency loading of the slider. This allows the test of the state of the rock mass around the tunnel during the entire life cycle of the submarine tunnel. The test is conducted in a hypergravity geocentrifuge to increase the gravitational acceleration and simulate the service state of the tunnel segment under complex stress boundary. This significantly accelerates the internal damage evolution process of the structure, so that the model box can be equivalent to the service process of the prototype submarine tunnel structure for decades or even hundreds of years by running in a hypergravity field for a short time, which greatly shortens the experimental cycle.

[0031] (2) The present invention provides a wave-absorbing layer on the inner wall and bottom plate of the model box to absorb the vibration generated during the operation of the train track simulation mechanism, and avoids the reflection wave of the vibration wave on the inner wall and bottom plate of the model box from impacting the soil, causing the cumulative stress inside the rock layer to change and interfering with the test.

[0032] (3) Since the train track simulation mechanism inside the tunnel tapered pipe is located at the center of the model box width direction, the excited wave mainly propagates radially along the tunnel tapered pipe to the external rock layer. Considering that there is a certain incident angle between the propagation direction of the vibration wave of the train track simulation mechanism and the inner wall of the box, in order to improve the absorption efficiency and reduce the reflection phenomenon, the wave absorbing strip is designed as a triangular structure, so as to achieve effective absorption of vibration waves of different frequencies and different incident angles, thereby simulating a more realistic wave attenuation process.

[0033] (4) If the seawater is simply placed inside the model box, the interior cannot be completely saturated. Therefore, during the vacuuming process, low-frequency vibration is accompanied, which makes it easy to completely extract the air bubbles inside the rock layer, so that the seawater can completely soak all the gaps, thereby improving the realism of the simulation of the surrounding rock of the submarine tunnel.

[0034] (5) This invention establishes the rock mass damage formula (Equation 2-4) for the entire life cycle of the surrounding rock of the submarine tunnel, and obtains the viscosity coefficient of the rock mass at two different stages in combination with the experiment. The viscosity coefficient of the rock mass is a key parameter describing the time-dependent mechanical behavior of the rock mass. The viscosity coefficient will change significantly at the two different stages. When the change is serious, it will threaten the bearing capacity of the rock mass around the tunnel that has been put into operation. The viscosity coefficient is a physical bridge connecting the transient response and long-term time-varying behavior of the rock mass, providing a quantitative basis for the prediction of tunnel life, and is of great significance for the excavation, construction and operation of tunnel engineering. Attached Figure Description

[0035] Figure 1 This is a front longitudinal section view of the model box of the present invention.

[0036] Figure 2 This is a side longitudinal sectional view of the model box of the present invention.

[0037] Figure 3 This is a schematic diagram of the structure of the tunnel tapered pipe of the present invention located inside the wave-absorbing layer.

[0038] Attached reference numerals: 1-box body, 2-wave-absorbing layer, 3-rock layer, 4-seawater, 5-tunnel scaled-down pipe, 6-train track simulation mechanism, 7-control mechanism, 21-wave-absorbing plate, 22-wave-absorbing strip, 23-bottom support strip. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] A testing method for the entire life cycle of surrounding rock in subsea tunnels based on ultragravity geocentrifuge technology, specifically including the following steps:

[0041] (1) See Figure 1 and Figure 2 The model box is constructed, which includes a box body 1, a wave-absorbing layer 2, a rock layer 3, seawater 4, a tunnel scaled-down pipe 5, a Bragg fiber grating strain sensor, and a train track simulation mechanism 6.

[0042] The absorbing layer 2 is set on the inner wall and bottom plate of the box 1. The rock layer 3 is set in the lower part of the box 1. The seawater 4 is set in the upper part of the box 1, that is, directly above the rock layer 3. The tunnel tapered pipe 5 (made of pipe segments spliced ​​together) is set at the center of the width direction of the rock layer 3 and the tunnel tapered pipe 5 extends along the long side of the box 1. The train track simulation mechanism 6 is set in the tunnel tapered pipe 5. The train track simulation mechanism 6 includes a slide rail extending along the long axis of the tunnel tapered pipe 5, a slider slidably set on the slide rail, a load loading mechanism set on the slider, and a control mechanism that drives the slider to move along the slide rail and adjusts the load loading mechanism. The control mechanism 7 is located outside the tunnel tapered pipe 5. The Bragg fiber grating strain sensor is set in the rock layer 3 near the tunnel tapered pipe 5.

[0043] The width of the rock layer 3 inside the box 1 is L1, and the outer diameter of the tunnel tapered pipe 5 is L2. The ratio between the two satisfies the following relationship: L1>k1×L2, where the value of k1 is 4.2 to 5.9.

[0044] See Figure 3 The absorbing layer 2 includes an absorbing plate 21 whose outer surface is completely covered and fixedly connected to the inner wall and bottom plate of the enclosure 1, and multiple serrated absorbing strips 22 that are covered and fixedly connected to the inner surface of the absorbing plate 21. The long axis of the absorbing strips 22 is parallel to the long side of the enclosure 1. The multiple absorbing strips 22 on the inner wall of the enclosure 1 are arranged vertically in parallel and completely cover the inner surface of the absorbing plate 21. The multiple absorbing strips 22 on the bottom plate of the enclosure 1 are arranged parallel along the width direction of the enclosure 1 and completely cover the top surface of the absorbing plate 21. The longitudinal section of the multiple absorbing strips 22 on the inner wall of the enclosure 1 is a right triangle. One right-angled outer surface of the absorbing strip 22 is a vertical surface, and the other right-angled outer surface is a horizontal surface. The vertical surface of the absorbing strip 22 is fixedly connected to the inner surface of the absorbing plate 21. The horizontal surface of the absorbing strips 22 above the horizontal centerline of the tunnel tapered pipe 5 is upward, and the horizontal surface of the absorbing strips 22 below the horizontal centerline of the tunnel tapered pipe 5 is downward. The wave-absorbing strip 22 has its horizontal surface facing downwards; the longitudinal section of the multiple wave-absorbing strips 22 on the bottom plate of the box body 1 is an isosceles triangle, and the bottom surface of the wave-absorbing strip 22 is fixedly connected to the top surface of the wave-absorbing layer plate 21, with the apex angle of the wave-absorbing strip 22 facing upwards. Multiple bottom support strips 23 with a semi-circular longitudinal section are also fixedly connected to the bottom surface of the wave-absorbing layer plate 21 on the bottom plate of the box body 1. The multiple bottom support strips 23 are arranged parallel to each other along the width direction of the box body 1 and completely cover the bottom surface of the wave-absorbing layer plate 21. The top surface of the bottom support strip 23 is fixedly connected to the bottom surface of the wave-absorbing layer plate 21. The wave-absorbing layer plate 21 and the wave-absorbing strip 22 are both made of polyurethane porous foam, and the bottom support strip 23 is made of ferrite rubber. The wave-absorbing layer plate 21 and the wave-absorbing strip 22 are used to absorb the vibration waves during the operation of the train track simulation mechanism 6, and the bottom support strip 23 is used to absorb the vibration of the bottom surface of the basket caused by the unbalanced force during the operation of the super gravity geotechnical centrifuge.

[0045] The width of the horizontal plane of each wave-absorbing strip 22 on the inner wall of the box 1 and the height of each wave-absorbing strip 22 on the bottom plate of the box 1 are L3. The height of the vertical plane of each wave-absorbing strip 22 on the inner wall of the box 1, the width of the bottom surface of each wave-absorbing strip 22 on the bottom plate of the box 1, and the diameter of each bottom support strip 23 are L4. The ratio of the two satisfies the following relationship: L4=k2×L3. Under a centrifugal force of 100g, the value of k2 is 0.41~0.62. Under a centrifugal force of 100-300g, the value of k2 is 0.51~0.72.

[0046] (2) The model box is placed in a vacuum chamber for saturation treatment. A vibration platform is set up in the vacuum chamber, and the model box is placed on the vibration platform. While the vacuum is being drawn, the vibration platform is simultaneously vibrating at a low frequency (vibration frequency is 0.2~1Hz). The vacuuming time T satisfies the following formula (1):

[0047] T = k3 × V1 / P (1);

[0048] In equation (1), V1 represents the internal volume of the vacuum chamber, P represents the vacuum pressure, and k3 is the harmonic coefficient, with a value of M·L. -4 ·T -1 M·L -4 ·T -1 In this context, M represents a unit of mass, L represents a unit of length, and T represents a unit of time.

[0049] (3) After the vacuuming is completed, the model box is taken out from the vacuum box and placed in the basket of the supergravity geocentrifuge. Then the supergravity geocentrifuge is started. After the supergravity geocentrifuge runs smoothly, the train track simulation mechanism in the model box is started. The Bragg fiber grating strain sensor collects the strain of the rock layer near the tunnel tapered pipe in real time, thereby observing the nonlinear elastic deformation of the rock layer throughout the entire life cycle during the operation of the train track simulation mechanism, and the stress load σ borne by the rock near the tunnel tapered pipe is calculated by the following formula (2).

[0050]

[0051] In equation (2), ε is the strain of the rock layer near the tunnel tapered pipe collected in real time by the strain sensor; E1 is the theoretical modulus of the rock layer, which is a constant; E2 is the modulus of the rock layer after disturbance and fracturing, which is a constant; H is 0.86 to 1.32; t is time; n is the multiple of the gravitational acceleration g under hypergravity environment after the gravity geocentrifuge is started; k4 is 0.12 to 1.25.

[0052] Then the stress load σ calculated by equation (2) is compared with the average yield stress σ of the rock layer. y For comparison, the average yield stress σ of the rock layery It is a known constant;

[0053] When σ < σ y At that time, the rock near the tunnel tapered pipe had not reached the fatigue acceleration node, and the stress load σ satisfied the following equation (3):

[0054]

[0055] In equation (3), the value of k5 ranges from 0.23 to 1.32; The first derivative of the stress load σ; ε is the first derivative of the dependent variable ε; w1 is the viscosity coefficient of the rock layer in the first stage to be solved;

[0056] When σ≥σ y At that time, the rock near the tunnel tapered pipe enters the accelerated fatigue stage, and the stress load σ satisfies the following equation (4):

[0057]

[0058] In equation (4), the value of k6 is 1.23 to 1.68; w2 is the viscosity coefficient of the second stage of the rock layer to be solved, namely the acceleration stage.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A testing method for the entire life cycle of surrounding rock in subsea tunnels based on ultragravity geocentrifuge technology, characterized in that: Specifically, it includes the following steps: (1) Construct a model box. The model box includes a box body, a wave-absorbing layer, a rock layer, seawater, a tunnel tapered pipe, a strain sensor, and a train track simulation mechanism. The wave-absorbing layer includes a wave-absorbing plate whose outer surface is completely covered and fixedly connected to the inner wall and bottom plate of the box body, and multiple wave-absorbing strips with a serrated shape that are covered and fixedly connected to the inner surface of the wave-absorbing plate. The long axis of the wave-absorbing strips is parallel to the long side of the box body. Multiple wave-absorbing strips on the inner wall of the box body are arranged in parallel vertically and completely cover the inner surface of the wave-absorbing plate. Multiple wave-absorbing strips on the bottom plate of the box body are arranged in parallel along the width direction of the box body and completely cover the top surface of the wave-absorbing plate. The rock layer is located in the lower part of the box body, and the seawater is located in the upper part of the box body, that is, directly above the rock layer. The tunnel tapered pipe is located in the rock layer and extends along the long side of the box body. The train track simulation mechanism is located in the tunnel tapered pipe, and the strain sensor is located in the rock layer near the tunnel tapered pipe. The multiple wave-absorbing strips on the inner wall of the box have right-angled triangular cross sections. One right-angled outer surface of the wave-absorbing strip is a vertical surface, and the other right-angled outer surface is a horizontal surface. The vertical surface of the wave-absorbing strip is fixedly connected to the inner surface of the wave-absorbing layer plate. The wave-absorbing strips above the horizontal centerline of the tunnel tapered pipe have their horizontal surfaces facing upwards, and the wave-absorbing strips below the horizontal centerline of the tunnel tapered pipe have their horizontal surfaces facing downwards. The multiple wave-absorbing strips on the bottom plate of the box have isosceles triangular cross sections. The bottom surface of the wave-absorbing strip is fixedly connected to the top surface of the wave-absorbing layer plate, and the apex of the wave-absorbing strip faces upwards. Multiple bottom support strips with semi-circular cross sections are also fixedly connected to the bottom surface of the wave-absorbing layer plate on the bottom plate of the box. The multiple bottom support strips are arranged parallel to each other along the width direction of the box and completely cover the bottom surface of the wave-absorbing layer plate. The top surface of the bottom support strip is fixedly connected to the bottom surface of the wave-absorbing layer plate. (2) Place the model box in a vacuum chamber for saturation treatment. A vibration platform is set up in the vacuum chamber. The model box is placed on the vibration platform. While the vacuum is being drawn, the vibration platform vibrates at a low frequency. When the model box is placed in a vacuum chamber for saturation treatment, the vacuuming time is... Satisfy the following equation (1): （1）； In equation (1), Represents the internal volume of the vacuum chamber. This represents the pressure required to create a vacuum. The harmonic coefficient, The value is , In Representative quality unit, Represents a unit of length, Represents a unit of time; (3) After the vacuuming is completed, the model box is taken out from the vacuum box and placed in the basket of the supergravity geocentrifuge. Then the supergravity geocentrifuge is started. After the supergravity geocentrifuge runs smoothly, the train track simulation mechanism in the model box is started. The strain sensor collects the strain of the rock layer near the tunnel tapered pipe in real time, so as to observe the nonlinear elastic deformation of the rock layer throughout the entire life cycle during the operation of the train track simulation mechanism. The strain sensor collects the strain of the rock layer near the tunnel tapered pipe in real time, and calculates the stress load on the rock near the tunnel tapered pipe using the following formula (2). ; （2）； In equation (2), To enable strain sensors to collect real-time strain data of the rock strata near the tunnel's scaled-down pipe, Let be the theoretical modulus of the rock layer, which is a constant. The modulus of the rock layer after disturbance and fracturing is a constant. The value ranges from 0.86 to 1.32; For time; This is a multiple of the gravitational acceleration g under hypergravity conditions after the hypergravity geocentrifuge is started; The value ranges from 0.12 to 1.25; Then the stress load obtained by equation (2) is calculated. With the average yield stress of the rock layer Compare; when At that time, the rock near the tunnel tapered pipe had not reached the fatigue acceleration point, and the stress load... Satisfy the following equation (3): （3）； In equation (3), The value ranges from 0.23 to 1.32; For stress load The first derivative; Dependent variable The first derivative; Let be the viscosity coefficient of the rock layer in the first stage to be solved; when At that time, the rock near the tunnel tapered pipe entered the accelerated fatigue stage, and the stress load... Satisfy the following equation (4): （4）； In equation (4), The value ranges from 1.23 to 1.68; denoted as ν, representing the viscosity coefficient of the second stage, or acceleration stage, of the rock layer to be solved.

2. The method for testing the entire life cycle of surrounding rock in a submarine tunnel based on ultragravity geocentrifuge technology according to claim 1, characterized in that: The tunnel tapered pipe is positioned at the center of the rock layer in the width direction, and the width of the rock layer inside the box is... The outer diameter of the tunnel tapered pipe is The ratio of the two satisfies the following relationship: , The value ranges from 4.2 to 5.

9.

3. The method for testing the entire life cycle of surrounding rock in a submarine tunnel based on ultragravity geocentrifuge technology according to claim 1, characterized in that: The microwave absorbing layer and microwave absorbing strip are both made of polyurethane porous foam, and the bottom support strip is made of ferrite rubber.

4. The method for testing the entire life cycle of surrounding rock in a submarine tunnel based on ultragravity geocentrifuge technology according to claim 1, characterized in that: The width of each wave-absorbing strip on the inner wall of the enclosure and the height of each wave-absorbing strip on the bottom plate of the enclosure are both [missing information]. The vertical height of each wave-absorbing strip on the inner wall of the enclosure, the width of the bottom surface of each wave-absorbing strip on the bottom plate of the enclosure, and the diameter of each bottom support strip are all... The ratio of the two satisfies the following relationship: Under 100g of centrifugal force, The value ranges from 0.41 to 0.62, under ultracentrifugal force of 100-300g. The value ranges from 0.51 to 0.

72.

5. The method for testing the entire life cycle of surrounding rock in a submarine tunnel based on ultragravity geocentrifuge technology according to claim 1, characterized in that: The strain sensor used is a Bragg fiber grating strain sensor.

6. The method for testing the entire life cycle of surrounding rock in a submarine tunnel based on ultragravity geocentrifuge technology according to claim 1, characterized in that: The train track simulation mechanism includes a slide rail extending along the long axis of the tunnel tapered pipe, a slider slidably mounted on the slide rail, a load loading mechanism mounted on the slider, and a control mechanism for driving the slider to move along the slide rail and regulating the load loading mechanism.

7. The method for testing the entire life cycle of surrounding rock in a submarine tunnel based on ultragravity geocentrifuge technology according to claim 1, characterized in that: During the vacuuming process, the vibration frequency of the vibration platform is 0.2~1Hz.

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