Non-Contact Measurement of Vertical Deflections of Rail Trackbeds and Performance Testing of Stabilized Sub-Ballasts Using a Novel Micropiling System
Publication: Geo-Congress 2023
ABSTRACT
Trackbed stabilization (TBS) refers to engineering works to improve the railway trackbed stiffness in areas affected by poor load bearing capacity from soft subgrade. There are a variety of TBS techniques available to improve soft subgrades; however, many conventional approaches require a full renewal of the ballast which is disruptive and requires lengthy track possession time. This paper documents the improvements of a soft subgrade site in the UK using micropiles, installed between sleepers during overnight possession methods, thus allowing daytime rail traffic to run as normal. A non-contact vision-based monitoring (VBM) system developed by the authors and consisting of a high-speed camera was used to quantify the track bed deflection before and after the remedial works. The VBM system records displacement–time response of the rail and its foundation system during train passage. The results obtained from the experiments indicate that the post-rehabilitation trackbed modulus was increased.
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Geo-Congress 2023
Pages: 539 - 548
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Published online: Mar 23, 2023
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