The Influence of Cyclic Loading Frequency on the Response of an Unsaturated Railway Formation Soil
This paper presents the results of cyclic triaxial tests conducted on unsaturated soil samples recovered from the railway embankment of a South African coal line to investigate the influence of cyclic loading frequency on a formation layer material, in this case a clayey sand. The testing involved suction-monitored repeated loading tests accounting for the conditions likely to be encountered in practice under varying train speed. The results of single-stage loading tests with a frequency applied individually in a range of 0.5–4 Hz were compared to the results of multistage loading tests with a frequency increasing from 1 to 4 Hz. The results of the single-stage loading tests indicated that the accumulated axial strain increased with an increase in the cyclic frequency, implying that a higher train speed would result in a higher level of the permanent deformation. The staged increase in the frequency of the multistage loading tests showed that the permanent deformation mainly took place during the first packet of cyclic loads whereas the deformations measured during the following repeated loads were negligible. Suction reduction and an increase in degree of saturation during cyclic loading was dependent on the water-retention state of the sample. The results were then interpreted in terms of resilient modulus.
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Corporate Authors:
American Society of Civil Engineers
1801 Alexander Bell Drive
Reston, VA United States 20191-4400 -
Authors:
- Kumar, Ashutosh
- Azizi, Arash
- Toll, David
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Conference:
- Geo-Congress 2022
- Location: Charlotte North Carolina, United States
- Date: 2022-3-20 to 2022-3-23
- Publication Date: 2022
Language
- English
Media Info
- Media Type: Web
- Features: References;
- Pagination: pp 274-283 283
- Monograph Title: Geo-Congress 2022: Geoenvironmental Engineering; Unsaturated Soils; and Contemporary Topics in Erosion, Sustainability, and Coal Combustion Residuals
Subject/Index Terms
- TRT Terms: Clay soils; Embankments; Moisture content; Railroad trains; Repeated loads
- Geographic Terms: South Africa
- Subject Areas: Geotechnology; Maintenance and Preservation; Railroads;
Filing Info
- Accession Number: 01848987
- Record Type: Publication
- ISBN: 9780784484050
- Files: TRIS, ASCE
- Created Date: Jun 21 2022 10:31AM