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A Dynamic Response Model and Test Method of Ballast Scatter and Subgrade

A technology of dynamic response and ballast, applied in vibration testing, using stable tension/pressure to test material strength, fluid velocity measurement, etc., can solve problems such as unguaranteed calculation efficiency and large number of units

Active Publication Date: 2020-11-27
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods have greatly promoted the development of the finite element model of the ballasted track, but because they all adopt full-solid modeling, the number of elements is relatively large, and the calculation efficiency cannot be guaranteed

Method used

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  • A Dynamic Response Model and Test Method of Ballast Scatter and Subgrade
  • A Dynamic Response Model and Test Method of Ballast Scatter and Subgrade
  • A Dynamic Response Model and Test Method of Ballast Scatter and Subgrade

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preparation example Construction

[0063] Preparation and treatment of ballast particles in the first ballast layer 2: The preparation and treatment of ballast particles in the first ballast layer 2 is one of the keys to the success of the test. The ballast particles should have a hardness equivalent to that of the actual ballast on site , the size and the ratio of 1:6 are used to scale the actual ballast ratio. The ballast particles are processed into a uniform regular tetrahedron with a base length of 1cm and a height of 1cm. The material is medium-slightly weathered granite or hardness and rigidity. Similar rocks and materials, and the ballast particles in the second ballast layer 3 only need to be processed into regular tetrahedrons.

[0064] The dynamic response model of the ballast dispersion and the foundation bed also includes a test element 6 which is set on the filler soil of the foundation bed 1 . The test element 6 includes a surface displacement meter 610, an earth pressure cell 620 and a horizonta...

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Abstract

The invention relates to a railway ballast bulk solid and foundation bed dynamic response model, which comprises a foundation bed, a first railway ballast layer, a second railway ballast layer, a sleeper and a rail, wherein the first railway ballast layer, the second railway ballast layer, the sleeper and the rail are laid on the foundation bed in sequence from bottom to top; the foundation bed comprises a model box and filler soil filled in the model box; the model box is an isosceles trapezoid box of which the upper end is provided with an opening; two wainscots, two interface plates and thebottom plate of the isosceles trapezoid box of which the upper end is provided with the opening are independently made of a flexible plate, a semi-rigid plate and a rigid plate; the rail is providedwith double excitation points, and a magnet is embedded in railway ballast particles in the first railway ballast layer. The model also comprises a magnetometer which is used for tracking the movementtrajectory of the magnet along with the railway ballast particles, and also comprises a test element, wherein the test element is arranged on the filler soil of the foundation bed. The model has thebeneficial effects: through the tracking observation of the movement process of the railway ballast in the flexible foundation bed in the model and the tracking observation of the stress state of thefoundation bed and the railway ballast near the foundation bed, a micromechanics behavior rule related to railway ballast sunk groove diseases is obtained.

Description

technical field [0001] The invention relates to the fields of bulk dynamics, fracture mechanics and road and railway engineering, in particular to a ballast bulk and foundation bed dynamic response model and a test method. Background technique [0002] To study the micro-mechanical mechanism of the formation of ballast pockets and ballast troughs in existing railway subgrades, it is necessary to study the micro-mechanical behavior of the ballast-bed interface of the ballasted track under the dynamic load of the train. The mesoscopic mechanical behavior of the foundation bed can only be observed through indoor similar model tests. [0003] To study the dynamic response relationship between the ballasted track subgrade and the ballast layer, it is necessary to obtain the distribution of stress, strain, and displacement of the filling soil under the action of dynamic load. Ballast behavior track distribution. [0004] When doing the dynamic load numerical simulation calculati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02G01N3/08G01P5/20
CPCG01M7/02G01M7/025G01N3/08G01N2203/0256G01P5/20
Inventor 肖尊群姜亦男汤东桑王鑫杨凯曹童童董琼英
Owner WUHAN INSTITUTE OF TECHNOLOGY
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