Large-ramp ballast track bed stability evaluation method

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...

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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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