The subgrade under a rail track, also known as the formation layer, performs a vital role in rail track stability. Its primary function is to withstand load imposed from rolling stock distributed through the track structure. Since common practice is to build rail track on the natural surface of the land, there is a considerable inherent variation. Problem soils such as expansive clays are common in Australia, which can suffer significant decreases in strength and stiffness when the soil moisture state is altered. A weak formation layer may experience plastic deformation and possibly shear failure leading to sever track geometry problems. Although there are many existing methods to remediate the causes of a loss in track geometry, most are expensive and also require track closure. / Thesis (MEng(CivilEngineering))--University of South Australia, 2006.
| Identifer | oai:union.ndltd.org:ADTP/267204 |
| Creators | Potter, Wayne. |
| Source Sets | Australiasian Digital Theses Program |
| Language | English |
| Detected Language | English |
| Rights | copyright under review |
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