Study on the False Joint’s Layout Mode of Unit Double-Block Ballastless Track Bearing Layer

Abstract:

The false joint of bearing layer is one of the engineering measures to guide the crack development, in unit double-block ballastless track, it’s usually designed in staggered arrangement with expansion joint of track concrete layer. According to the actual situation, this seam layout is unreasonable. So the thorough study on the design scheme of false joint is presented. The distribution of stress in bearing layer, under temperature load, is first computed, the result shows the bearing layer under expansion joint is more prone to cracking than that at other positions. Then compares the theoretical response got from two different kinds of seam layout under train load. Finally, the false joint design is optimized on the basis of project experience. A conclusion is drawn as follows: the false joint and the expansion joint ought to be aligned in general case, and the false joint setting in the middle of the unit should be canceled. But, when the railway is built on a unstable the lower foundation or in a area with plenty of rainfall, the false joint design ought to adopt the optimized arrangement of break joint.

• Periodical: Advanced Materials Research (Volumes 671-674)
• Pages: 1254-1258
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.671-674.1254
• Online since: March 2013
• Authors: You Xin Wei, Jiang Chen
• Keywords: Crack, Double-Block Ballastless Track, Expansion Joint, False Joint, Mechanical Analysis, Railway Engineering

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