Model test apparatus for studying dynamic response and long-term settlement law of high-speed railway

A model test device, high-speed railway technology, applied in the test of infrastructure, roads, measuring instruments, etc., can solve problems such as failure to test the internal train dynamic stress of the foundation, failure to predict the dynamic response and long-term settlement law, and lack of

Inactive Publication Date: 2011-04-13
WENZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the simulation of vibration loads in the above-mentioned experimental studies is mostly limited to symmetrical sinusoidal cyclic loads, which are different from the pulse characteristics of vibration of traffic loads, and the focus of research is basically limited to the influence of dynamic stress and cycle times on deformation.
In terms of field test research, due to the limitations of test conditions, test instruments and costs, at present, only the vibration displacement, velocity and acceleration tests can be carried out on the subgrade under the load of rail transit, but the dynamic stress caused by the train inside the foundation has not been tested. The research on the internal dynamic stress of the foundation is limited to the scope of theoretical analysis, and most of the existing research is limited to the impact of ground vibration caused by rail transit loads on the surrounding environment.
Moreover, the field test is based on the existing high-speed railway. For the high-speed railway with a speed of more than 300km / h that has not been built or opened to traffic, it is impossible to conduct experimental research, and it is impossible to predict its dynamic response and long-term settlement law.
In short, there are very few studies on reasonably simulating the dynamic characteristics of foundation soil under rail transit loads considering the pulse characteristics of cyclic loads, especially the lack of consideration of the complex stress state and stress path on the development process of dynamic stress and dynamic strain in the soil. However, this point is precisely the key to the combination of theoretical research and experimental research on the permanent deformation of foundation soil under traffic loads

Method used

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  • Model test apparatus for studying dynamic response and long-term settlement law of high-speed railway
  • Model test apparatus for studying dynamic response and long-term settlement law of high-speed railway
  • Model test apparatus for studying dynamic response and long-term settlement law of high-speed railway

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Embodiment Construction

[0010] Such as figure 1 , figure 2 As shown, the frame beam 1 is connected with the frame vertical beam 2 to support the entire test device. The hydraulic jack 3 is installed under the frame beam 1. The jack is controlled by the computer 4 to provide M-shaped load, which is transmitted to the sleeper through the pad 5 and the wedge-shaped force transfer plate 6. 7 On the force sensor 8 at both ends, brackets 9 are installed beside the two ends of the sleeper 7, and the displacement sensor 10 and the vertical pipe equipped with the acceleration sensor 11 are set on it. The sleeper is directly laid on the ballast layer 12, and the ballast layer 12 is the foundation In soil 13, there are lateral steel plates 14 on both sides of the ballast layer 12 and the foundation soil 13 to limit lateral displacement, and the bottom steel plate 15 provides support. The ballast layer 12 and the foundation soil 13 are embedded with an earth pressure box 16 .

[0011] When testing, input from comp...

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Abstract

The invention relates to a novel experimental apparatus for a high-speed railway, in particular to a model test apparatus for studying the dynamic response and long-term settlement law of the high-speed railway, which can simulate and predict the driving conditions with the speed of more than 400km / h and can provide a basis for the settlement prediction under the long-term effect.

Description

Technical field [0001] The invention relates to a new type of high-speed railway experimental device, in particular to a model test device for studying the dynamic response and long-term settlement law of the high-speed railway. Background technique [0002] Before the present invention, indoor dynamic tests and field tests were commonly used methods in the research and test of the dynamic response and settlement laws of high-speed railways. Indoor dynamic tests include dynamic triaxial apparatus and hollow cylinder torsion apparatus. The research objects of these experiments are all soil samples, and the analysis of the dynamic characteristics of the soil sample micro-element bodies is very different from the force characteristics of the on-site roadbed. Moreover, the simulation of vibration load in the above-mentioned experimental research is mostly limited to symmetrical sinusoidal cyclic load, which is different from the pulse characteristics of vibration of traffic load. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01B35/00E02D33/00
Inventor 蔡袁强王军郭林孙宏磊
Owner WENZHOU UNIV
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