A large-scale excavation in soft Holocene deposit and its elasto-viscoplastic analysis |
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| Authors: | Fusao Oka Naoki Takada Kazuyuki Shimono Yosuke Higo Sayuri Kimoto |
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| Institution: | 1.Lab. 3, Association for Disaster Prevention Research,Kyoto University,Sakyo-ku,Japan;2.JR West Japan Consulting, Co. Ltd.,Yodogawa-ku,Japan;3.Osaka Construction Office, JR West Japan,Yodogawa-ku,Japan;4.Department of Urban Management Engineering,Kyoto University,Nishikyo-ku,Japan;5.Department of Civil and Earth Resources Engineering,Kyoto University,Nishikyo-ku,Japan |
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| Abstract: | In the present study, the large-scale excavation in the construction is numerically back-analyzed using a soil–water-coupled finite element method with an elasto-viscoplastic model which considers the strain-induced degradation. The measurements of the deformation have been performed during the construction of a new railway station in Osaka, Japan, in which a large and deep excavation has been successfully carried out using a special deep mixing type of soil improvement method with earth retaining walls through the thick Holocene Osaka Umeda clay deposit. A comparison between the numerical results and the measurements of the excavation at Osaka shows that the simulation method can reproduce the overall deformation of the soft ground and the earth retaining walls including the time-dependent behaviour during the excavation and a deep mixing soil improvement method as an additional technique for stability are effective. |
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