Evaluation method for maintenance timing of track interlayer separation joints based on concrete elastic-plastic model

Abstract

The invention discloses a concrete elastoplastic model-based track interlayer gap maintenance opportunity assessment method. The method comprises the following steps of building a ballastless track finite element model according to geometric sizes and physical attributes, actually measured on site, of a track structure; applying temperature loads in different working conditions to the model, and calculating and analyzing stress and deformation conditions of the ballastless track; determining an initial region in which a gap occurs according to a calculated stress and deformation nephogram of the ballastless track; calculating and analyzing occurrence and development conditions of the gap width and gap depth changed with the temperature in the gap region, performing comparison with existing standard ''high-speed railway ballastless track maintenance management measures'' in China, and judging a damage level; and based on an assessment level, determining a temperature change amplitude limit value and a time node corresponding to the temperature change amplitude limit value, thereby determining a reasonable maintenance opportunity. According to the method, the occurrence position of the gap can be determined and the evolutionary condition of the gap can be analyzed and predicted based on field track and environmental conditions, so that the reasonable track interlayer gap maintenance opportunity is proposed.

Description

technical field [0001] The invention relates to the field of ballastless track seamless lines. More specifically, it relates to an evaluation method for maintenance and repair of CRTS II ballastless slab track slabs. Background technique [0002] Ballastless track materials are complex, consisting of various materials such as concrete, mortar, emulsified asphalt, geotextiles and elastic buffer cushions; at the same time, its structure is extremely complex, with different types of ballastless track slabs, limit structures, Connecting parts, base, sliding layer and adhesive layer, etc.; the stress is restricted by the upper seamless line, lower subgrade, bridge and tunnel foundation, etc., and the stress transfer relationship between layers is complicated. This kind of ballastless track structure system with complex materials and structural types has more complex mechanical characteristics under the action of complex temperatures. Field surveys show that some ballastless tra...

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Problems solved by technology

[0006] At present, due to the lack of operating experience and the lack of scientific theoretical guidance for maintenance and repair, the maintenance and repair department mostly adopts the method of "treating the head and feet with a headache" to deal with the above-mentioned problems such as separation seams and overhangs caused by temperature deformation and imbalance of the above-mentioned ballastless track. The method of "painful treatment" does not understand the force mechanism and damage mechanism of the track under the complex load combination, which leads to a certain lack of maintenance methods and maintenance timing, so that there will be more serious problems in winter for lines that are rehabilitated in summer. disease, disease in the adjacent area or on a larger scale in the line under partial treatment, disease in the previous year’s treatment still appeared or even worsened in the second year, etc.

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