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Rail Embankment Stabilization Needs on the Hudson Bay Railway
| 题名： | Rail Embankment Stabilization Needs on the Hudson Bay Railway |
| 作者： | Oommen, T.; Addison, P.; Lautala, P. |
| 关键词： | Railway Engineering Module##Railroad track steel##Geological aspects##Mining (Data)##Stabilization Needs##Hudson Bay Railway##Railroad applications##Pavement design guides##Rail Embankment##Literature reviews##Permafrost conditions## |
| 摘要： | Literature review of EBA reports provided background to the permafrost conditions of the HBR corridor. It revealed the underlying permafrost to be warm and ice-rich in the study area. In these circumstances the temperature of the underlying permafrost is close to 32ºF and any disturbance that causes energy gain could potentially lead to permafrost thaw. The ice-rich description means that the underlying permafrost is interspersed with frozen chunks of ice, which get dissipated and create voids when thawed. When compressed, these voids consequently result in the sinkholes manifested at the ground surface. EBA reported that sinkholes were more prevalent in the discontinuous permafrost zones, especially in the extensive discontinuous permafrost zone under investigation, at locations where there is contact between permafrost ground (peat plateau) and non-permafrost ground (fen)— transition zones. Permafrost thaw was found to occur at these transition zones when the relatively warm fen loses its heat to the cold peat plateau. EBA’s overall investigation concluded that the railway was in need of mitigation measures; deterioration of the embankment was predicted if nothing was done. A stabilization approach using thermosyphons was recommended for the thawing sections of the discontinuous permafrost zones, as prototype testing over the course of a four-year study had proved them effective. However, this extensive stabilization measure recommended by EBA was not put in place after the study and consequently our initial geophysical exploration work revealed that some locations initially delineated by EBA as underlain by permafrost were now thawed (Addison et al., 2016b). This confirmed the predicted worsening site conditions. In addition to confirming EBA predictions, the study also resulted in other findings, as described in the sections bel |
| 总页数： | 65 |
| 报告类型： | 科技报告 |
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