Radial metamaterial arranged on outer wall of subway tunnel lining
By installing a ring-shaped single-cell structure composed of steel structure and rubber layer on the outer wall of the subway tunnel lining, the low-frequency broadband band gap is formed by material coupling resonance, which solves the problem of subway vibration control and realizes effective isolation of low-frequency environmental vibration caused by subway Vibration effect.
Patent Information
- Application Number
- CN202420808264.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-18
AI Technical Summary
The prior art is difficult to effectively control the ground environment vibration caused by subways, especially wide-band and long-term vibrations. The traditional track structure vibration isolation method cannot meet the vibration control needs under random loads of subways.
Design a radial metamaterial placed on the outer wall of the subway tunnel lining, including a steel structure layer and a rubber layer, and forms a low-frequency broadband band gap through the coupling resonance between the steel structure layer and the rubber layer, and is used to control the subway. Vibration of the ground environment.
Effective control of low-frequency broadband environmental vibration caused by subways is achieved, and the impact of elastic waves generated by subways on the ground environment can be significantly reduced without affecting the intensity of subway tunnels.
Smart Images
Figure CN222296250U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of subway vibration reduction and isolation, and specifically relates to a radial metamaterial arranged on the outer wall of a subway tunnel lining. Background Art
[0002] The environmental vibration caused by subway operation can have an adverse impact on people's daily life and work, and even cause damage to the adjacent buildings themselves. Therefore, studying new vibration isolation measures for ground vibration caused by subway has important engineering significance and social value.
[0003] As cities expand and their populations increase, subway operation brings convenience to people, but the environmental vibration caused by train operation is becoming increasingly serious. The environmental vibration caused by subway not only affects the safety of building structures and the use of precision instruments, but also affects people's daily life and physical and mental health. However, subway vibration has the characteristics of wide frequency and long duration, making it relatively difficult to reduce and isolate subway vibration.
[0004] Although the commonly used track structure vibration isolation methods (elastic cushions, elastic fasteners, sleepers, etc.) have achieved certain results, they are often targeted at a specific frequency band and cannot meet the wide frequency range under random loads of subways. Therefore, a new ground vibration control solution is urgently needed. Summary of the invention
[0005] In order to overcome the above technical problems, the purpose of the utility model is to provide a radial metamaterial placed on the outer wall of the subway tunnel lining, which can generate a low-frequency broadband band gap for controlling the ground environment vibration caused by the subway. The structure is placed outside the tunnel pipe to achieve vibration control from the vibration propagation path.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0007] A radial metamaterial placed on the outer wall of a subway tunnel lining comprises a steel structure layer attached to the outside of a tunnel pipe, a rubber layer attached to the outside of the steel structure layer, and the outside of the rubber layer in contact with site soil;
[0008] The steel structure layer and the rubber layer constitute a unit cell structure, and the unit cell structure is an annular structure. The unit cell structure is provided in multiple groups, and the unit cell structures are bonded to each other, and the inner rubber layer is bonded to the next outer steel structure layer.
[0009] The unit cell structure forms an elastic wave barrier along the Z-axis direction.
[0010] The unit cell structure is arranged in four groups along the Z-axis direction, presenting a four-periodic arrangement, and presenting a semi-infinite period in the X-axis direction.
[0011] The steel structure layer has a radial thickness of 0.08 m in the Z direction and a length of 1.2 m in the X direction.
[0012] The rubber layer has a radial thickness of 0.04 m in the Z direction and a length of 1.2 m in the X direction.
[0013] The unit cell structure is surrounded to form a ring structure, the circumference of the ring structure is greater than the circumference of the semicircle, and the longest one forms a ring.
[0014] The steel structure layer has a radial width of 0.08 m in the Z direction and an axial length of 1.2 m.
[0015] The rubber layer has a radial width of 0.04 m and an axial length of 1.2 m.
[0016] Beneficial effects of the utility model:
[0017] Compared with traditional track vibration reduction, the utility model can generate low-frequency broadband and effectively control the broadband environmental vibration caused by random loads of subways. It can be prefabricated together with the subway tunnel lining to control low-frequency vibration without affecting the strength of the subway tunnel.
[0018] The radial metamaterial of the utility model has certain application value in the field of low-frequency engineering vibration reduction and can effectively control elastic waves. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the unit cell structure of the utility model.
[0020] Figure 2 It is a three-dimensional arrangement diagram of the utility model.
[0021] Figure 3 This is the energy band diagram of the radial metamaterial structure of the utility model.
[0022] Figure 4 This is a frequency response function curve of the radial metamaterial structure of the utility model. DETAILED DESCRIPTION
[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.
[0024] like Figure 1 , Figure 2 As shown, an implementation method of the radial metamaterial structure of the utility model, the radial metamaterial is arranged in 4 periods along the z direction and arranged semi-wirelessly along the tunnel in the x direction. The radial metamaterial structure is composed of a steel structure layer 1 and a rubber layer 2. The steel structure layer 1 and the rubber layer 2 are bonded to each other. The surface of the steel structure layer 1 and the rubber layer 2 is a square structure, which forms a ring structure after surrounding the pipeline. The steel structure layer 1 is in contact with the outer wall of the tunnel lining, and the metamaterial structure is placed in the soil matrix outside the tunnel lining.
[0025] The materials used are steel structure layer and neoprene rubber pad. The specific material parameters are as follows:
[0026]
[0027] from Figure 3 The energy band diagram shows that this radial metamaterial has a low frequency and wide bandwidth, with the first band gap ranging from 37.66 to 203.47 Hz. The band gap frequency is low and covers the main frequency of ground vibration caused by the subway.
[0028] from Figure 4 It can be seen from the frequency response function curve that the transmission characteristic curve has an attenuation domain at 37.66~203.47Hz, which is consistent with Figure 3 The energy band diagram matches.
[0029] The band gap formation mechanism of the utility model is that the band gap starting frequency vibration mode presents the up and down movement of two materials, and the cut-off frequency vibration mode is that the steel structure layer 1 is stationary and the rubber layer 2 moves upward, which shows that the generation of the band gap is the result of the coupling resonance of the two materials, so the mechanism of the band gap is a typical local resonance mechanism. It can be seen that the radial metamaterial structure of the utility model can effectively isolate the ground environment vibration caused by the subway in the low-frequency range.
[0030] Therefore, the radial metamaterial structure of the utility model can be applied to fields such as engineering vibration reduction. The new radial metamaterial can be placed in the soil matrix of the outer wall of the subway tunnel lining to reduce the impact of the elastic waves generated by the subway on the ground environment.
Claims
1. A radial metamaterial placed on the outer wall of a subway tunnel lining, characterized in that: It comprises a steel structure layer (1) attached to the outside of a tunnel pipe, a rubber layer (2) attached to the outside of the steel structure layer (1), and the outside of the rubber layer (2) in contact with the site soil; The steel structure layer (1) and the rubber layer (2) form a unit cell structure, which is a ring-shaped structure. The unit cell structure is provided in multiple groups, and the unit cell structures are bonded to each other, and the inner rubber layer (2) is bonded to the next outer steel structure layer (1).
2. The radial metamaterial placed on the outer wall of a subway tunnel lining according to claim 1, characterized in that: The unit cell structure forms an elastic wave barrier along the Z-axis direction.
3. The radial metamaterial placed on the outer wall of a subway tunnel lining according to claim 1, characterized in that: The unit cell structure is arranged in three groups along the Z-axis direction, presenting a three-periodic arrangement, and presenting a semi-infinite period in the X-axis direction.
4. The radial metamaterial placed on the outer wall of a subway tunnel lining according to claim 1, characterized in that: The steel structure layer (1) has a radial thickness of 0.08 m in the Z direction and a length of 1.2 m in the X direction.
5. The radial metamaterial placed on the outer wall of a subway tunnel lining according to claim 1, characterized in that: The rubber layer (2) has a radial thickness of 0.04 m in the Z direction and a length in the X direction of 1.2 m.
6. The radial metamaterial placed on the outer wall of a subway tunnel lining according to claim 1, characterized in that: The unit cell structure is surrounded to form a ring structure, the circumference of the ring structure is greater than the circumference of the semicircle, and the longest one forms a ring.