Abstract
The roadbed on over-wet permafrost and underground ice sections requires a thorough examination after a long-term exploitation period. Its strengthening design requires an individual technological approach. The paper considers two examples. The first one is located on the 28th km section of the Chulman passing siding entrance, and the second one is on the 59th km of the Amur-Yakutsk Mainline. The causes of the roadbed deformation are determined by the analysis of different surveys, special engineering and geological methods as well as the geometry car ongoing data. Some new technological design solutions that are patented and introduced on working sites are covered in the paper.
Highlights
80 % of the territory of the Russian Far East is located in the zone of permafrost
FESTU has been dealing with issues of construction, reinforcement and maintenance of the subgrades and other structures built on permafrost since the 1960’s and has dealt with the structures of the Baikal-Amur Mainline (BAM) since the beginning of its construction
The earthen roadbed on permafrost soils under conditions of long-term operation is subject to deformations: firstly, to “heat” settling due to permafrost degradation; – to “cryogenic” due to ice heaving, icing moulds, pressure mechanical piping and others
Summary
80 % of the territory of the Russian Far East is located in the zone of permafrost. FESTU has been dealing with issues of construction, reinforcement and maintenance of the subgrades and other structures built on permafrost since the 1960’s and has dealt with the structures of the Baikal-Amur Mainline (BAM) since the beginning of its construction. The problem of preserving the stability of the railway subgrades in the North of the Russian Far East under the conditions of long-term operation on high-grade permafrost soils remains relevant in the process of their further operation. The BAM was put into operation more than thirty years ago, and the Amur-Yakut Mainline - more than 20 years ago. Two thirds of the whole length of subgrades were constructed in accordance with the individual projects
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