LONG-TERM CONSOLIDATION CHARACTERISTIC OF DILUVIAL CLAY IN OSAKA BAY

On large-scale reclamation works, the consolidation settlement of diluvial clays which lie deep underground should be discussed. The diluvial clay in Osaka Bay is in a quasi-overconsolidated state by cementation bonding. The values of the compression index and the void ratio are very large in spite...

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Bibliographic Details
Published inSOILS AND FOUNDATIONS Vol. 31; no. 4; pp. 61 - 74
Main Authors AKAI, KOICHI, KAMON, MASASHI, SANO, IKUO, SOGA, KENICHI
Format Journal Article
LanguageEnglish
Published Tokyo The Japanese Geotechnical Society 01.12.1991
Japanese Geotechnical Society
Subjects
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Engineering geology
Exact sciences and technology
void ratio
sedimentary rocks
overconsolidated materials
time factor
clastic sediments
consolidation
clay
settlement
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Summary:On large-scale reclamation works, the consolidation settlement of diluvial clays which lie deep underground should be discussed. The diluvial clay in Osaka Bay is in a quasi-overconsolidated state by cementation bonding. The values of the compression index and the void ratio are very large in spite of the large overburden pressure. Therefore, its consolidation characteristic is considered to be different from that of the alluvial clay. In this paper, a series of long-term consolidation tests is carried out, and it is revealed that the value of coefficient of secondary compression (Cα) under a load in the quasi-overconsolidated region becomes to be that in the normally consolidated region as time elapses. Considering the effect of strain rate, this result shows that the yield stress is dependent on the strain rate. This also means that even if a clay behaves as an overconsolidated clay in the test, it might behave as a normally consolidated clay in the site. Therefore, it should be considered that the in-situ secondary compression settlement was underestimated if it was calculated by using Cα of the laboratory test. In addition, the settlements on two reclamation works in Osaka Bay are calculated by a proposed long-term settlement analyzing method using strain rate and time relationship, and the results are in good agreement with the observed settlement data at sites.
ISSN:0385-1621
0038-0806
DOI:10.3208/sandf1972.31.4_61