Citation

Doya Y, Sawada T, Morikawa T, Iseda Y. Journal of Fujiology 2019; 15(2): 1-15.

Copyright

(Copyright © 2019)

DOI

10.57325/fujisan.15.2_1

PMID

unavailable

Abstract

Around Mt. Fuji, there are several water bodies such as lakes and rivers, which include Lake Yamanaka, Lake Kawaguchi, Motosu Lake, Sai Lake, Syoji Lake, Fuji River, Haya River, Sakawa River, etc. New bodies of water, such as landslide dams, are formed from the eruptions of Mt. Fuji. Emergency measures that are used to respond to the volcanic hazards of Mt. Fuji include the usage of general purpose machines such as backhoes, dump trucks, and crawler cranes. However, when a disaster occurs near the edge of a water body, the use of backhoe dredges, soil pontoons, and crane barges may be more effective. Further, ferry transports and floating piers may be used as a temporary solution to solve the problem of road restoration.

Unfortunately, these work barges cannot be towed directly from the sea into the affected areas near lakes or rivers. One solution would be to use knockdown pontoons that can be carried on standard commercial vehicles and assembled in the closing water area. An additional advantage is that these pontoons can be used as hulls for various work barges. Therefore, to determine the feasibility of the usage of knockdown pontoons for emergency procedures in case of Mt. Fuji volcanic hazards, we investigate the stability and strength of a reinforced, rectangular-hull knockdown pontoon.

The stability of the self-propelled ship is evaluated by the metacentric height of the ship. However, a pontoon with a rectangular hull exhibits a large metacentric height that could cause the loss of ship stability. We propose a new technique to avoid an overly optimistic evaluation of a pontoon's stability.

The hull strength evaluation method that is used in case of the reinforced knockdown pontoon differentiates between two types of load distributions, divided load and concentrated load. By comparing the evaluations that were obtained using these two types of load distribution, we clarified the differences between these approaches

Language: ja

Keywords

安定性; 富士山; 矩形船体; 組立式台船; 船体強度; 補強船体