河川築堤材料の強度特性に関する研究

概要

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In Japan, many river disasters due to heavy rain or typhoons have occurred every year. As a result, the river embankments have been constructed to be stronger and more stable. The river embankment materials should have the properties necessary for the possibility of bulldozer construction and the protection from collapse by submerged water. The purpose of this study is to clearly identify the most suitable materials for river embankments. To this end, the strength tests of several kinds of materials are performed.As a result, (1) when the specimens are formed with less than optimum moisture content (OMC), high strength is gained. But the strength is decreased further by submergence, and the specimens collapse owing to the slaking within a short submerged time. On the other hand, in the case of higher water content than OMC, the strength reduction with submergence is less and the specimens are stable. (2) When the embankment materials are mixed with 10% fluidized bed combustion coal fly ash and cured for two weeks, the strength and the resistance against collapse by submergence become remarkably increase. (3) The mixing effect as an additive is not found for the incinerated paper sullage ash nor the fine particles of crushed stone.