A suspended tunnel earthquake and flow-induced vibration composite test simulation device

Abstract

The present invention discloses a composite test simulation device for earthquake and flow-induced vibration of a suspended tunnel. The suspended pipe model is supported by a steel frame base, so that its two ends are located in rock and soil to be affected by earthquakes, and its middle part is located in water to be affected by hydrodynamic forces. The structural dynamic response process of the suspended tunnel under the coupling of earthquakes and hydrodynamic forces can be simulated. The simulation device can realize differential simulation through two vibration tables. In the simulation device, the suspended pipe model is in a suspended state, which can more accurately simulate the state of the suspended tunnel during actual operation. The simulation device adopts a cable spring model, which can more accurately realize the elastic simulation of the anchor cable. The present invention can reasonably and accurately simulate earthquake motion and flow-induced vibration at the same time.

Description

Technical Field

[0001] The invention relates to simulation test technology for civil engineering, water conservancy and the like, and in particular to a test device suitable for composite simulation of earthquake and flow-induced vibration of a suspended tunnel. Background Art

[0002] my country's transportation development has made great progress, and the construction of land and air transportation has brought great convenience to people's travel. However, how to quickly cross complex waters has become another difficult problem in transportation development. In recent years, with the construction of traditional bridges and underwater tunnels, the water environment and geological conditions have become more and more complex. Traditional construction methods face huge challenges in complex waters and need continuous breakthroughs and innovations. Compared with traditional bridges and underwater tunnels, suspended tunnels have obvious advantages in environmental protection, the impact of severe climate, the impact of impact loads, and interference with maritime transportation. As a new underwater tunnel concept structure that crosses complex waters, it has become a hot topic in global transportation construction research.

[0003] In the past research on suspended tunnels, the work of researchers from all over the world mainly covered the engineering concept design, structural dynamic analysis theory and model tests of suspended tunnels. As a new type of underwater crossing traffic structure, it is extremely necessary to carry out model tests of different scales for the actual operation of suspended tunnels. Different from the environment in which ground structures are located, underwater suspended tunnels are not only subject to their own weight and vehicle loads, but also to various environmental dynamic loads such as buoyancy, waves, ocean currents, and earthquakes. Studying the dynamic response of suspended tunnels under the action of complex environments has become the focus of studying the safety and stability of suspended tunnels. As a large-span flexible structure, it is very important to study the degree of fatigue damage caused by flow-induced vibration to suspended tunnels; and once an undersea earthquake occurs, it will inevitably bring great destructive power to the suspended tunnel, so the combined influence of earthquakes and flow-induced vibrations on suspended tunnels has considerable research value. However, in existing studies, there are no specific model tests and research methods under the coupling of earthquakes and hydrodynamic environments.

[0004] Therefore, it is necessary to propose a new test device that can simulate the safety and stability of suspended tunnels under the combined effects of earthquake and flow-induced vibration while meeting similarity criteria. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a test simulation device for a suspended tunnel under the combined action of earthquake and flow-induced vibration, wherein the test device can simulate earthquake motion and flow-induced vibration simultaneously.

[0006] The technical solution adopted by the present invention is: a suspended tunnel earthquake and flow-induced vibration composite test simulation device, comprising:

[0007] Suspended pipe model;

[0008] A water pool, wherein a vibration platform foundation is arranged in the water pool and is filled with water above the vibration platform foundation; a vibration platform installation space is arranged in the vibration platform foundation;

[0009] A vibration table, wherein the vibration table is arranged in a vibration table installation space of the vibration table foundation;

[0010] An actuator, the actuator being arranged on the side wall and the bottom surface of the vibration table installation space and directly acting on the vibration table;

[0011] A steel frame cushion, the steel frame cushion is arranged on the vibration table and is used to support the suspended pipeline model to be suspended at a height;

[0012] A soil box, the soil box is arranged on the steel frame base; two ends of the suspended pipeline model are respectively located in the soil box to be subjected to earthquake action, and the remaining part is suspended in water to be subjected to hydrodynamic action;

[0013] An anchor cable model, the anchor cable model is arranged between the bottom surface of the suspended pipeline model and the vibration table foundation;

[0014] A cable spring model, wherein one end of the anchor cable model is connected to the suspended pipe model through the cable spring model, and the elastic deformation of the anchor cable model itself is simulated by the cable spring model; and

[0015] A soil spring model, wherein the other end of the anchor cable model is connected to the shaking table foundation through the soil spring model, and the elastic deformation of the soil between the anchor cable model and the shaking table foundation is simulated by the soil spring model.

[0016] Furthermore, a waterproof air pillow is provided in the gap between the top surface of the vibration table and the side wall of the vibration table installation space, so as to isolate the water in the pool from the outside of the vibration table installation space and ensure the normal operation of the actuator.

[0017] Furthermore, the actuators disposed on the side walls of the vibration table installation space are arranged in the horizontal direction and along the four sides of the vibration table; and the actuators disposed on the bottom surface of the vibration table installation space are arranged in the vertical direction.

[0018] Furthermore, the soil box includes a box body and model soil filled in the box body; damping material is attached to the inner wall of the box body as a damping boundary of the model soil.

[0019] Wherein, the box body is made of steel, and the damping material is made of silicone rubber.

[0020] Furthermore, a pair of the anchor cable models are symmetrically arranged along the longitudinal section of the suspended pipeline model, and a plurality of pairs of the anchor cable models are arranged along the longitudinal direction of the suspended pipeline model.

[0021] The beneficial effects of the present invention are:

[0022] The present invention discloses a composite test simulation device for earthquake and flow-induced vibration of a suspended tunnel. By designing a steel frame base to support the suspended pipeline, the two ends of the suspended pipeline are located in the rock and soil to be affected by earthquakes, and the middle part is located in the water to be affected by hydrodynamic forces. This device can simulate the structural dynamic response process of the suspended tunnel under the coupling of earthquakes and hydrodynamic forces. The simulation device is designed with two vibration tables to realize differential simulation. In the simulation device, the pipeline is in a suspended state to more accurately simulate the state of the suspended tunnel during actual operation. The device adopts a cable-spring model to more accurately simulate the elasticity of the anchor cable. A composite test simulation device for earthquake and flow-induced vibration of a suspended tunnel can reasonably and accurately simulate earthquake motion and flow-induced vibration at the same time. It provides a reference for the safety of the suspended tunnel during actual use, reduces or avoids risks in structural construction and operation, and provides ideas for the continued optimization and development of the suspended tunnel in terms of improving seismic performance and weakening vortex-induced resonance and new structural forms under the action of water flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 : Schematic diagram of the suspended tunnel involved in the present invention;

[0024] Figure 2 : A front view of a suspended tunnel earthquake and flow-induced vibration composite test simulation device of the present invention;

[0025] Figure 3 : A cross-sectional view of a suspended tunnel earthquake and flow-induced vibration composite test simulation device of the present invention;

[0026] Figure 4 : Schematic diagram of the anchor cable model of the present invention.

[0027] Attached figures are marked: 1. Suspended pipe model; 2. Damping boundary; 3. Model soil; 4. Soil box; 5. Steel frame pad; 6. Anchor cable model; 7. Cable spring model; 8. Soil spring model; 9. Vibration table; 10. Waterproof air pillow; 11. Actuator; 12. Vibration table foundation; 13. Water tank. DETAILED DESCRIPTION

[0028] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0029] As attached Figures 1 to 4As shown, a suspended tunnel earthquake and flow-induced vibration composite test simulation device includes a suspended pipe model 1, a soil box 4, a steel frame cushion 5, an anchor cable model 6, a cable spring model 7, a soil spring model 8, a shaking table 9, a waterproof air pillow 10, an actuator 11, a shaking table foundation 12 and a water pool 13.

[0030] The vibration table foundation 12 is arranged at the bottom of the pool 13, and the vibration table foundation 12 is filled with water. Two vibration table installation spaces are arranged in the vibration table foundation 12. Two vibration tables 9 are arranged, which are respectively installed in the vibration table installation spaces of the vibration table foundation 12, and a waterproof air pillow 10 is arranged in the gap between the top surface of the vibration table 9 and the side wall of the vibration table installation space, which is used to isolate the water in the pool 13 from the outside of the vibration table installation space to ensure the normal operation of the actuator 11. The actuator 11 is arranged on the side wall and bottom surface of the vibration table installation space and directly acts on the vibration table 9, wherein the actuator 11 arranged on the side wall of the vibration table installation space is arranged in the horizontal direction and arranged along the four sides of the vibration table 9; the actuator 11 arranged on the bottom surface of the vibration table installation space is arranged in the vertical direction. The steel frame pads 5 are respectively established on the two vibration tables 9 to support the suspended pipeline model 1 to be suspended at a certain height. The soil box 4 is respectively arranged on the two steel frame seats 5, and the soil box 4 includes a box body and a model soil 3 filled in the box body; the inner wall of the box body is affixed with a damping material, which serves as a damping boundary 2 of the model soil 3 and can play a buffering and energy dissipation role, wherein the box body is made of steel, and the damping material can be a polymer silicone rubber material. The two ends of the suspended pipeline model 1 are respectively located in the soil box 4 to be subjected to earthquake action, and the rest of the part is suspended in the water to be subjected to hydrodynamic action. The anchor cable model 6 is arranged between the bottom surface of the suspended pipe model 1 and the shaking table foundation 12. A pair of the anchor cable models 6 are symmetrically arranged along the longitudinal section of the suspended pipe model 1, and several pairs of the anchor cable models 6 are arranged along the longitudinal direction of the suspended pipe model 1. Based on the similarity of stiffness, one end of the anchor cable model 6 is connected to the suspended pipe model 1 through the cable spring model 7, and the elastic deformation of the anchor cable model 6 itself is simulated by the cable spring model 7. The other end of the anchor cable model 6 is connected to the shaking table foundation 12 through the soil spring model 8, and the elastic deformation of the soil between the anchor cable model 6 and the shaking table foundation 12 is simulated by the soil spring model 8.

[0031] When conducting earthquake-flow-induced vibration composite tests, the fluid is designed using the gravity similarity criterion, that is, the water body acceleration scale λ under the hydrodynamic simulation environment a1 =λ g1 =1, where λ g1is the gravity acceleration scale in the hydrodynamic simulation environment. Since the water material cannot be replaced, the water density cannot be changed, that is, the water density scale λ ρ1 =1, then we can get the velocity scale λv1=λ L 0.5 , time scale λ T1 =λ L 0.5 , flow rate scale λ Q1 =λ L 2.5 , where λ L is the geometric scale of the suspended pipeline model 1; the suspended pipeline model 1 is designed according to the water elastic similarity, and the weighted rubber with the same density as the original suspended tunnel material is used as the material of the suspended pipeline model 1, that is, the material density scale λ of the suspended pipeline model 1 ρ2 =1, and the acceleration scale λ of the suspended pipe model 1 in the hydroelastic simulation environment a2 =λ g2 =1, where λ g2 is the gravity acceleration scale in the hydroelastic simulation environment, then the ratio of the elastic modulus of the material of the suspended pipeline model 1 to the elastic modulus of the original suspended tunnel material is λ E2 =λ ρ2 λ a2 λ L =λ L ; The surrounding rock and soil are designed according to elastic similarity, and the ratio of the bulk elastic modulus of model soil 3 to the bulk elastic modulus of the actual surrounding rock and soil of the project is λ E3 =λ k3 λ L 2 , where k is the volume elastic coefficient, λ k3 is the volume elastic ratio; the anchor cable is simulated as a cable plus spring based on similar stiffness.

[0032] In this embodiment, the length of the prototype suspended tunnel is 1200m, the diameter of the tunnel is 24m, and the tunnel is located 48m underwater. The geometric scale of this model test is 1:80, the length of the suspended pipe model 1 is 15m, the diameter of the suspended pipe model 1 is 0.3m, and the depth of the simulated maximum pool 13 is 3m. In this example, two vibration tables 9 are provided, and the table top is a square with a side length of 5m. The length, width and height of the two soil boxes 4 are 3m, 1.5m, and 1.5m respectively.

[0033] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which belong to the scope of protection of the present invention.

Claims

1. A suspended tunnel earthquake and flow-induced vibration composite test simulation device, characterized in that: include: Suspended pipe model (1); A water pool (13), wherein a vibration table foundation (12) is arranged in the water pool (13), and the vibration table foundation (12) is filled with water; and a vibration table installation space is arranged in the vibration table foundation (12); A vibration table (9), wherein the vibration table (9) is arranged in a vibration table installation space of the vibration table foundation (12); An actuator (11), the actuator (11) being arranged on the side wall and the bottom surface of the vibration table installation space and directly acting on the vibration table (9); A steel frame cushion (5), the steel frame cushion (5) being arranged on the vibration table (9) and used for supporting the suspended pipeline model (1) to be suspended at a certain height; A soil box (4), wherein the soil box (4) is arranged on the steel frame base (5); two ends of the suspended pipeline model (1) are respectively located in the soil box (4) to be subjected to earthquake action, and the remaining part is suspended in water to be subjected to hydrodynamic action; An anchor cable model (6), the anchor cable model (6) being arranged between the bottom surface of the suspended pipeline model (1) and the vibration table foundation (12); A cable spring model (7), one end of the anchor cable model (6) is connected to the suspended pipeline model (1) through the cable spring model (7), and the elastic deformation of the anchor cable model (6) itself is simulated by the cable spring model (7); and A soil spring model (8), wherein the other end of the anchor cable model (6) is connected to the shaking table foundation (12) via the soil spring model (8), and the soil spring model (8) is used to simulate the elastic deformation of the soil between the anchor cable model (6) and the shaking table foundation (12); The soil box (4) comprises a box body and model soil (3) filled in the box body; the inner wall of the box body is affixed with damping material, which serves as a damping boundary (2) of the model soil (3); A pair of anchor cable models (6) are symmetrically arranged along the longitudinal section of the suspended pipeline model (1), and a plurality of pairs of anchor cable models (6) are arranged along the longitudinal direction of the suspended pipeline model (1); Two vibration table installation spaces are provided in the vibration table foundation (12), and two vibration tables (9) are provided, which are respectively installed in the vibration table installation spaces of the vibration table foundation (12). The steel frame pads (5) are respectively established on the two vibration tables (9), and the soil boxes (4) are respectively provided on the two steel frame pads (5).

2. A suspended tunnel earthquake and flow-induced vibration composite test simulation device according to claim 1, characterized in that: A waterproof air pillow (10) is provided in the gap between the top surface of the vibration table (9) and the side wall of the vibration table installation space, and is used to isolate the water in the pool (13) from the outside of the vibration table installation space, thereby ensuring the normal operation of the actuator (11).

3. A suspended tunnel earthquake and flow-induced vibration composite test simulation device according to claim 1, characterized in that: The actuator (11) disposed on the side wall of the vibration table installation space is arranged in the horizontal direction and along the four sides of the vibration table (9); the actuator (11) disposed on the bottom surface of the vibration table installation space is arranged in the vertical direction.

4. A suspended tunnel earthquake and flow-induced vibration composite test simulation device according to claim 1, characterized in that: The box body is made of steel, and the damping material is made of silicone rubber.

Images