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Preparation method of physical model test device for large-cycle accelerated loading of railway subgrade

A physical model, a technology of railway subgrade, applied in the direction of using repetitive force/pulse force to test the strength of materials, etc., which can solve the difficulty in simulating changes in the dynamic performance of transportation infrastructure, uncontrollable geological conditions and environmental conditions, and inability to model the track and subgrade. Realize problems such as reproducibility, and achieve the effects of real-time monitoring, easy burying, and simple test operation

Active Publication Date: 2014-10-01
ZHEJIANG UNIV
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Problems solved by technology

Another example is the ballastless track test section of the Eastern Suburb Ring Road in Beijing, where real vehicles are used for on-site simulation tests, which can realize dynamic tests at different train speeds. Unable to achieve repeatability, and difficult to simulate changes in the dynamic performance of traffic infrastructure after long-term service

Method used

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  • Preparation method of physical model test device for large-cycle accelerated loading of railway subgrade
  • Preparation method of physical model test device for large-cycle accelerated loading of railway subgrade
  • Preparation method of physical model test device for large-cycle accelerated loading of railway subgrade

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with drawings and embodiments. The preparation process of device among the present invention is as follows:

[0043] 1. The construction of model test chamber 1: such as figure 1 As shown, model test chamber 1: a rectangular steel structure model tank composed of main steel structure beams and columns 5 and main structure side steel plates 6. The specific size can be determined according to the required model size. In this example, the size used is 15m×long Width 5m x height 6m;

[0044] 2. The construction of the high-speed railway ballastless track subgrade model 2 and the monitoring system 4: lay gravel and sand cushion 22 on the bottom plate of the model test box 1. On the gravel and sand cushion layer 22, the foundation 7, the bottom layer of the foundation bed 8 and the surface layer of the foundation bed 9 are layered. During the filling process, the middle thickness of the foundation 7, the ju...

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Abstract

The invention discloses a preparation method for a railway road bed large-week acceleration loading physical model test device. According to the method, the device is adjusted by constructing a model test box, a high-speed railway ballastless track road bed model, a monitoring system and an exciting system through analysis of a load bearing ratio test result, and a continuous steel rail is cut into fragmental steel rails, so that a stress state of a sub-rail structure is close to a state of running of a real train. Due to cooperative work of vibration exciters in the exciting system, a value model is used for calculating a load time-history result serving as an input load, so that running states of the real train at different speeds can be simulated. The device prepared by the method can be used for short-time and long-time test research on long-time dynamic performance of traffic basic facilities.

Description

technical field [0001] The invention relates to a preparation method of a large-cycle accelerated loading physical model test device for a railway subgrade. In particular, it relates to a preparation method of a physical model test device for large-cycle accelerated loading of a railway subgrade by simulating moving loads of vehicles to reproduce real train running. Background technique [0002] my country is now in a period of rapid development of rail transit, whether it is high-speed railways and intercity ordinary railways, or light rails and subways, they are all in the process of high-speed construction. With the operation of high-speed railways, the speed of trains has increased significantly, which puts forward high requirements on the dynamic performance of track structure and subgrade soil. The increase of the train speed leads to the aggravation of the vibration of the track structure, especially when the train speed is close to the critical wave velocity of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
Inventor 边学成蒋红光陈云敏李公羽蒋建群陈仁朋
Owner ZHEJIANG UNIV
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