締固めたアロフェン質火山灰土の非排水先行載荷効果

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In our country, many banks are made of allophonic-volcanic ash soils which are notorious problem soils. Kuroboku soil which has high organic matter content and Akaboku are typical allophonic-volcanic ash soils. These soils in the banks are subjected to traffic loads, dead loads of itself and other structures under the nearly undrained condition during construction and for a short period after construction because of their low permeability and high water content. The hardening effect of undrained preloading with a repeated stretch load or a sustained stretch load on the highly saturated impact compacted Kuroboku soil had been studied seldomly in the past. In this research, the effect of preloading under undrained condition with repeated or sustained stage load was investigated experimentally on impact compacted specimens made of two kinds of the allphenic-volcanic ash soils (Kuroboku and Akaboku). These stage loadings were more practical than stretch loadings. The following results were obtained. (1) The hardening effect of preloading with repeated load was larger on Akaboku than on Kuroboku. (2) The smaller the increasing ratio of load or longer the loading period of one load stage, the larger the hardning effect of preloading was observed. (3) Organic matter in Kuroboku showed a buffer effect against the impact of repeated loading. (4) The banks of allophonic-volcanic ash soils may increase in density by preloading because their degree of saturation was lower than that of the specimens used in these experiments. From the above results, it is found that preloading with some stage loads under nearly undrained condition is practically effective for stabilizing subgrade and filled-up ground made of allophonic-volcanic ash soils.
社団法人日本材料学会の論文
1985-02-15

締固めたアロフェン質火山灰土の非排水先行載荷効果

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