Railroad bed active vibration reduction and isolation model testing device and testing method

Abstract

The invention discloses a railroad bed active vibration reduction and isolation model testing device, which is composed of a homogeneous foundation, a reference working condition testing device and aplurality of comparison working condition testing devices, wherein the reference working condition testing device comprises an embankment, a rigid plate, a flexible cushion layer and a vibration excitation system, and the embankment fills on the homogeneous foundation according to a reduced scale proportion; the rigid plate is placed on the top surface of the embankment; the flexible cushion layeris laid on the central area of the top surface of the rigid plate; the vibration excitation system is placed on the flexible cushion layer; a datum point is set on the rigid plate, a plurality of test points are set on the surface of the foundation outside a reinforcing area, and each of the datum point and the test points is provided with an acceleration vibration sensor used for picking up acceleration time history data; and each comparison working condition testing device has the same structure as the reference working condition testing device, and further comprises a specified type modelpile body built in the homogeneous foundation under the embankment. The railroad bed active vibration reduction and isolation model testing device is simple in structure and good in model testing effect, and can compare and analyze the vibration reduction and isolation effects of different roadbed reinforcement measures.

Description

technical field [0001] The invention relates to the field of railway roadbed vibration reduction, in particular to a railway roadbed active vibration reduction and isolation model test device and a test method. Background technique [0002] During the operation of the railway, the vibration generated when the train passes the railway subgrade section will propagate through the subgrade to the surrounding foundation along the line, causing environmental vibration pollution. Long-term environmental vibration will cause physical discomfort of the surrounding residents, damage the structure of buildings, and affect the normal production of some high-precision industries. Due to the series of adverse effects brought by environmental vibration, it has been listed as one of the seven major environmental hazards in the world. [0003] There are three main types of measures to control the vibration transmission of railway subgrade: vibration source control, transmission path control...

AI Technical Summary

Problems solved by technology

Among them, the field test has the highest reliability, but it is large in size and requires a lot of manpower and material resources, which cannot be afforded by general institutions; although the investment required for the numerical simulation test is relatively small, a large number of assumptions are required for each model component. When there is a lack of engineering experience and field test results, it is easy to lead to erroneous results; model testing is a good compromise, but it is rare to see active vibration reduction and isolation model tests for railway subgrades or related structures

[0005] The railway embankment is a flat strip structure with a long length along the track. The actual vibration load on the railway embankment section is the vibration caused by the movement of the train along the track. I want to directly simulate the belt in motion through the model test. Dynamic loads and subgrade structures will inevitably lead to a huge model volume, which cannot reflect the advantages of model tests

Using the original scale to make the model can ensure the credibility of the results, but the volume is too large to reflect the advantages of the model test

When the scale model is used, due to the small volume of the embankment, it is difficult to ensure sufficient compaction, so the reference point sensor cannot be effectively fixed

Images