高築堤軟弱地盤区間における補強盛土による線増工事の施工例

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  • The case of construction to increase a track between the section of high embankment and poor subsoil

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We, TOBU RAIL WAY CO. LTD, have been working on the construction to lay double tracks in place of a present single line between IWATUKI and KASUKABE. (it's distance is around 7.4 kilometers) There are purpose for this construction; first, to increase the capacity of transportation, second, to relieve congestion and third, to cope with the demand of transportation whose scale may be bigger in the future in TOBU NODA LINE. There is high embankment between the section we are working on. Geological feature of there is poor subsoil which is made from organic silts, humus soil and tuffic clay. Moreover, along the side of a railroad, houses stand together. After our much consideration about aspects of difficulties of the construction, an environmental and economical matter, and periods we would need to spend, we concluded that widening embankment by an usual method which retains a wall might cause some problems.<br>Then, this time, we have decided to adopt the different way which reinforces banks. Recently, this kind of method has been making actual results and is recognised to be an excellent way for aseismicity.<br>In this paper, we are going to state about circumstances explaining about how and why we made a decision to try this way-by reinforcing banks-to widen embankment, and also about results from our examinations, plans, methods of construction on the place where there is high embankment placed on the poor subsoil.

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