2013 Fiscal Year Final Research Report

Study of Optimizing Control of Embankment Construction on Peaty Ground Combinedly using Vacuum Consolidation Method

Research Project

Project/Area Number	23760438
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Multi-year Fund
Research Field	Geotechnical engineering
Research Institution	Akita University
Principal Investigator	OGINO Toshihiro 秋田大学, 工学(系)研究科(研究院), 准教授 (80312693)
Research Collaborator	YAMAZOE Nobutaka (株)シーウェイエンジニアリング, 技術部, 次長
Project Period (FY)	2011 – 2013
Keywords	真空圧密 / 高有機質土
Research Abstract	A series of laboratory triaxial tests which simulated embankment construction on peaty ground combinedly using vacuum consolidation method were performed to confirm that optimizing the rate and starting time of the embankment loading can suppress lateral deformation of the ground during construction. The test results revealed that the rate and start time of axial stress loading strongly affected resulting lateral strain of the samples. Possibility that optimization of the loading condition of vacuum pressure and embankment allows one to construct the embankment with almost no lateral deformation was indicated. Combined loading of vacuum pressure and axial stress also strongly improved strength and deformation characteristics of peat samples. A prediction method proposed so far for clayey soil could successfully be applied to undrained shear strength of peat soils under the combined loading.