Large-ramp ballast track bed stability evaluation method

An evaluation method and ballast bed technology, applied in the field of rail transit, to achieve the effect of convenience, realization and easy understanding

Inactive Publication Date: 2019-07-23
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The strength reduction method can quickly analyze the slope stability problem, but the above patent application descriptions all analyze the slope stability under the condition of self-weight. In fact, the stability problem of the ballasted bed of the large-slope railway is under the train load, Caused by the combined action of temperature load and gravity

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Embodiment

[0034] Below, the analysis method proposed in this application is further introduced in detail through an example of ballast bed stability analysis of a section of steep slope railway (seamless track).

[0035] (1) Establishment of nonlinear finite element model of ballasted track with large ramp

[0036] In order to realize the automation of the finite element model, this application uses the parametric design language APDL of the finite element software ANSYS for modeling. Among them, 50 rails are used, the gauge is 1000mm, and the sleepers are concrete sleepers, which are regarded as trapezoidal columns in the model. The physical parameters of the rail and sleeper are listed in Table 1, and the cross-section of the sleeper is shown in figure 1 . The crushed stone ballast bed is simulated by continuous medium. According to Zeng Shugu's "Railway Granular Ballast Bed" related content, the density of the first-class ballast is 1300-2000kg / m 3 , The internal friction angle is...

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Abstract

The invention relates to a large-ramp ballast track bed stability evaluation method, aiming at objectively analyzing the stability problem of the large-ramp ballast track bed under extreme conditionsunder the combined action of train load, temperature load and gravity, more conforming to the actual engineering condition, and providing technical reference and theoretical support for paving a ballast track in a large-ramp mountain area section. The method comprises the following steps: (1) establishing a large-ramp ballast track nonlinear finite element model, and modeling by adopting a parameterized design language (APDL) of finite element software ANSYS, including a steel rail, a sleeper and a ballast bed structure; (2) analyzing the stability of the ballast track bed of the large-ramp railway, applying a train load, a gravity load and a temperature load to the established nonlinear finite element model of the large-ramp ballast track, and solving according to the slope and vertical curve radius working conditions which need to be set; if the finite element calculation is not convergent, indicating that the ballast bed is damaged, and entering an unstable state; otherwise, indicating that the ballast bed is stable, and extracting equivalent plastic strain of the ballast bed to determine a dangerous area and a potential sliding surface of the ballast bed.

Description

technical field [0001] The present invention relates to rail transportation, in particular to a method for evaluating the stability of a ballasted bed on a large slope. Under the joint action of train load, temperature load and gravity, the stability of the ballasted bed with a super-large slope is analyzed objectively under extreme conditions, and more It is in line with the actual engineering situation and provides technical reference and theoretical support for laying ballast track in mountainous areas with large slopes. Background technique [0002] As an important part of the railway ballast track, the gravel track bed is the foundation of the track frame and has the function of fixing the geometric shape of the track. Its stability is directly related to the safety and long-term durability of the upper track structure. With the construction of some tourist railways in mountainous areas, such as the development of key projects such as Dujiangyan to Siguniang Mountain, C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23
Inventor 韩义涛田春香李粮余韦凯王平张凯潘自立刘在庆莫宏愿李保友杨明辉汪盈盈杨吉忠
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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