CN217007130U - Test device for propagation of subway vibration in soil body - Google Patents
Test device for propagation of subway vibration in soil body Download PDFInfo
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- CN217007130U CN217007130U CN202220724780.4U CN202220724780U CN217007130U CN 217007130 U CN217007130 U CN 217007130U CN 202220724780 U CN202220724780 U CN 202220724780U CN 217007130 U CN217007130 U CN 217007130U
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Abstract
The utility model provides a test device that subway vibration propagated in the soil body which characterized in that: test soil samples simulating soil bodies are filled in the model box in a layered mode, tunnel models are buried in the test soil samples, and the tunnel models are formed by annular lining structures and ballast bed structures which are integrally poured by reinforced concrete; a vibration exciter is arranged on the ballast bed structure; a pressure sensor is arranged between the vibration exciter and the ballast bed structure; the surface of the test soil sample is distributed with a layer of acceleration sensors, and the inside of the test soil sample is distributed with a plurality of layers of acceleration sensors; the vibration exciter, the pressure sensor and the acceleration sensor are all connected with a dynamic signal testing, analyzing and controlling system. The device can simply, conveniently and truly simulate the tunnel and the soil environment, and measure the dynamic response distribution data of the subway vibration in the soil; further obtaining the propagation rule of subway vibration in the surrounding soil body; therefore, effective and reliable data support is provided for reducing the influence of subway operation on the ground environment and the new line damping design; the safe, efficient and environment-friendly operation of the subway is ensured.
Description
Technical Field
The utility model relates to a test device for subway vibration propagation in a soil body.
Background
The subway (underground rail transit) is a traffic tool with large traffic volume, safety, rapidness, punctuality, convenience and comfort, and has special status and function in solving the problem of urban traffic; the method greatly contributes to urban development and brings great convenience to the life of urban residents. But subway operation also brings vibration and noise pollution problems to the surrounding environment: the subway operation can generate air sound, the air sound is transmitted in a tunnel and a station, even transmitted to the ground through an entrance and an exit of the subway station, noise is generated, and the influence is generated on the environment and the life of people; more seriously, the subway operation generates vibration impact on the subway rail, the vibration is transmitted to the ground and a ground structure through a rail foundation, a tunnel, a soil body and a ground building to cause vibration, and further, the vibration of doors, windows, equipment and the like is excited in the building to make a sound, secondary vibration and secondary noise are generated, the life of surrounding residents is influenced, the safety and the reliability of the surrounding buildings and equipment are influenced, and even safety accidents occur. Therefore, the design and operation of the subway have to reduce the secondary vibration and the secondary noise formed by the propagation of the soil body to below the specified limit; to avoid and reduce the impact on surrounding buildings and residents.
The method has the advantages that relevant data of subway vibration propagation in the soil body are found out, the law of propagation of the subway vibration in the soil body is revealed, guidance and basis are provided for vibration reduction and environment protection design, construction and maintenance of the subway, and the method has important significance for guaranteeing safe, efficient and environment-friendly operation of the subway.
At present, the acquisition of the propagation data and the rule of subway vibration in a soil body is generally realized by adopting field tests and numerical simulation. However, the cost of the field test is high, the test conditions are not controllable, and the field test is almost difficult to carry out; and a plurality of deep wells need to be drilled in the surrounding soil body, and sensors are buried, and the drilled wells damage the properties of the soil body, so that the test conclusion is not very accurate and reliable. The numerical simulation excessively simplifies and theorizes the problems, and the real conditions of the problems are greatly different from those of subways and soil bodies, so that the errors are large, and the conclusion is unreliable. Therefore, it is urgently needed to develop a testing device for propagation of subway vibration in a soil body, so as to find out related data of propagation of subway vibration in the soil body through an indoor test, reveal the rule of propagation of subway vibration in the soil body, and provide reliable data support for reducing the influence of subway operation vibration and new line damping design.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a test device for spreading subway vibration in a soil body, which can simply, conveniently and truly simulate a tunnel and a soil body environment and measure dynamic response distribution data of the subway vibration in the soil body; further finding the relation between the distribution of the dynamic response data of the subway vibration in the soil body and different vehicle types and vehicle speeds, different tunnels, different tunnel burial depths, different stratums and different stratum water contents, and obtaining the propagation rule of the subway vibration in the surrounding soil body; therefore, reliable and effective data support is provided for reducing the vibration influence of subway operation on the ground environment and designing new line damping; so as to ensure the safe, efficient and environment-friendly operation of the subway.
The technical scheme adopted by the utility model for realizing the aim is that the test device for the propagation of subway vibration in a soil body is characterized in that:
a test soil sample for simulating a soil body is filled in the model box in a layered mode, a tunnel model for simulating a tunnel is embedded in the test soil sample, and the tunnel model is composed of an annular lining structure integrally cast by reinforced concrete and a ballast bed structure at the bottom of an inner cavity of the annular lining structure; the ballast bed structure is provided with a vibration exciter; a pressure sensor is arranged between the vibration exciter and the ballast bed structure;
the surface of the test soil sample is distributed with a layer of acceleration sensors, and the inside of the test soil sample is distributed with a plurality of layers of acceleration sensors;
and the vibration exciter, the pressure sensor and the acceleration sensor are all connected with a dynamic signal testing, analyzing and controlling system.
The working process and the test principle of the device are as follows:
according to the similar principle of the model test, a tunnel model of the tunnel to be tested is formed by pouring, a test soil sample of the soil body to be tested is manufactured and filled, and the acceleration sensor is buried. Starting a vibration exciter, applying set vibration to simulate the set train type and speed to the vibration load generated by the tunnel to be tested, and performing feedback control through a pressure sensor; the dynamic signal testing, analyzing and controlling system monitors and records the detection signals of all the acceleration sensors in the test soil sample, and further obtains the distribution data of dynamic response (vibration force, frequency and displacement of soil mass) of the proposed train type and the vibration of the train speed in the proposed tunnel and the proposed soil mass.
Changing the soil body and the water content thereof, the tunnel model burial depth and the set train vibration, so as to obtain the relation between the distribution of the dynamic response data of the subway vibration in the soil body and different vehicle types and speeds, different tunnels, different tunnel burial depths, different stratums and different stratum water contents; and further obtaining the propagation rule of subway vibration in the surrounding soil body.
Compared with the prior art, the utility model has the beneficial effects that:
the method can simply and conveniently simulate the tunnel and soil environment, and measure the dynamic response distribution data of subway vibration in the soil; further finding the relation between the distribution of the dynamic response data of the subway vibration in the soil body and different subway models and vehicle speeds, different tunnel structures, different tunnel burial depths, different stratums and different stratum water contents, and obtaining the propagation rule of the subway vibration in the surrounding soil body; therefore, more reliable and effective data support is provided for reducing the vibration influence of subway operation on the ground environment and designing new line shock absorption; so as to ensure the safe, efficient and environment-friendly operation of the subway.
Secondly, the vibration exciter simulates the vibration of a subway, feedback control is carried out through the pressure sensor, and a tunnel model and a test soil sample which are poured and formed according to a similar principle respectively simulate a tunnel structure and a surrounding soil body; the device has the advantages of simple structure, simple and convenient operation, low cost, good controllability and strong repeatability; the simulated subway vibration and tunnel structure and surrounding soil have high similarity with a real environment, and the measured experimental data are more real and reliable.
Further, the vibration exciter of the utility model is a YZS vibration motor.
The YZS vibration motor is small in size, the generated vibration is accurate and reliable, and the vibration of the subway train to the tunnel can be simply, conveniently and accurately simulated.
Furthermore, the acceleration sensors on the test soil sample are symmetrically distributed by taking the tunnel model as a center.
Furthermore, the utility model relates to a test device for subway vibration propagation in soil, which is characterized in that:
the concrete mode of the acceleration sensor distribution on the test soil sample is as follows: the surface of the test soil sample is distributed with a layer of acceleration sensors, and the inside of the test soil sample is distributed with three layers of acceleration sensors; the acceleration sensors in the middle layer are four rows and four columns, the column spacing and the row spacing are equal, and the central axis of the tunnel model is superposed with the central lines of the two columns in the middle; and the acceleration sensors of the other layers are arranged in a row of acceleration sensors right above or below the central axis of the tunnel model.
The distributed acceleration sensors can obtain more accurate subway vibration power response distribution data which has more influence on ground buildings and environment by the least acceleration sensors.
Furthermore, the model box is formed by assembling aluminum plates, and the inner wall of the model box is attached with a foam plastic plate.
The foam plastic plate on the inner wall of the model box is made of a vibration absorption material, so that compression waves and shear waves transmitted to the boundary of the model box by subway vibration can be better absorbed, the absorption effect of a semi-infinite medium on the vibration waves can be better simulated, and the vibration wave reflection effect of the inner wall of the model box is reduced; therefore, the experimental data is more accurate and reliable.
The utility model will be further described with reference to the following description of specific embodiments and the accompanying drawings.
Drawings
Fig. 1 is a schematic cross-sectional structure diagram of an embodiment of the present invention.
Fig. 2 is a schematic top view of the structure of fig. 1.
Fig. 3 is an enlarged view of a portion a of fig. 1.
Detailed Description
Examples
A test device for subway vibration propagation in soil body is characterized in that:
a test soil sample 2 for simulating soil mass is filled in the model box 1 in a layered mode, a tunnel model for simulating a tunnel is buried in the test soil sample 2, and the tunnel model is composed of an annular lining structure 3a which is integrally cast by reinforced concrete and a ballast bed structure 3b at the bottom of the inner cavity of the annular lining structure 3 a; a vibration exciter 5 is arranged on the ballast bed structure 3 b; a pressure sensor 4 is arranged between the vibration exciter 5 and the ballast bed structure 3 b;
a layer of acceleration sensors 6 is distributed on the surface of the test soil sample 2, and a plurality of layers of acceleration sensors 6 are distributed in the test soil sample;
the vibration exciter 5, the pressure sensor 4 and the acceleration sensor 6 are all connected with a dynamic signal testing, analyzing and controlling system.
The vibration exciter 5 of this example is a YZS vibration motor.
The acceleration sensors 6 on the test soil sample 2 of this example are symmetrically distributed with the tunnel model as the center.
The specific manner of distribution of the acceleration sensors 6 on the test soil sample 2 of this example is: a layer of acceleration sensor 6 is distributed on the surface of the test soil sample 2, and three layers of acceleration sensors 6 are distributed inside the test soil sample; the acceleration sensors in the middle layer are four rows and four columns, the column spacing and the row spacing are equal, and the central axis of the tunnel model is superposed with the central lines of the two columns in the middle; and the acceleration sensors 6 of the other layers are arranged in a row of acceleration sensors 6 right above or below the central axis of the tunnel model.
The mold box 1 of this example is assembled from aluminum plates, and a plastic foam plate 1a is attached to the inner wall of the mold box 1.
Claims (5)
1. A test device for subway vibration propagation in soil body is characterized in that:
the test soil sample (2) for simulating soil mass is filled in the model box (1) in a layered mode, a tunnel model for simulating a tunnel is buried in the test soil sample (2), and the tunnel model is composed of an annular lining structure (3a) which is integrally poured by reinforced concrete and a ballast bed structure (3b) at the bottom of an inner cavity of the annular lining structure (3 a); a vibration exciter (5) is arranged on the ballast bed structure (3 b); a pressure sensor (4) is arranged between the vibration exciter (5) and the ballast bed structure (3 b);
a layer of acceleration sensor (6) is distributed on the surface of the test soil sample (2), and a plurality of layers of acceleration sensors (6) are distributed inside the test soil sample;
the vibration exciter (5), the pressure sensor (4) and the acceleration sensor (6) are all connected with a dynamic signal testing, analyzing and controlling system.
2. The test device for the propagation of the subway vibration in the soil body according to claim 1, wherein: the vibration exciter (5) is a YZS vibration motor.
3. The test device for the propagation of subway vibration in the soil body according to claim 1, wherein: the acceleration sensors (6) on the test soil sample (2) are symmetrically distributed by taking the tunnel model as a center.
4. The test device for the propagation of the subway vibration in the soil body according to claim 3, wherein:
the distribution of the acceleration sensors (6) on the test soil sample (2) is characterized in that: the surface of the test soil sample (2) is distributed with a layer of acceleration sensor (6), and the inside is distributed with three layers of acceleration sensors (6); the acceleration sensors in the middle layer are four rows and four columns, the column spacing and the row spacing of the acceleration sensors are equal, and the central axis of the tunnel model is superposed with the central lines of the two columns in the middle; and the acceleration sensors (6) of the other layers are arranged in a row of acceleration sensors (6) right above or below the central axis of the tunnel model.
5. The test device for subway vibration propagation in soil body as claimed in claim 1, wherein said mold box (1) is assembled by aluminum plate, and foam plastic plate (1a) is attached to the inner wall of the mold box (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220724780.4U CN217007130U (en) | 2022-03-31 | 2022-03-31 | Test device for propagation of subway vibration in soil body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220724780.4U CN217007130U (en) | 2022-03-31 | 2022-03-31 | Test device for propagation of subway vibration in soil body |
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| Publication Number | Publication Date |
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| CN217007130U true CN217007130U (en) | 2022-07-19 |
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| CN202220724780.4U Active CN217007130U (en) | 2022-03-31 | 2022-03-31 | Test device for propagation of subway vibration in soil body |
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- 2022-03-31 CN CN202220724780.4U patent/CN217007130U/en active Active
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