Oka, F, Higo, Y, Kimoto, S, Nakano, M, Mukai, H. Kunotsubo, H, Izumitani, T, Takeda, S, Amano, K, Nagaya, J
Proc. 12th IACMAG, edited by D.N.Singh, Goa, India, Oct. 1-6, 6 4709-4715, 2008 Peer-reviewed
As part of the construction of a new subway line in Osaka, Japan, called the Nakanoshima Line, a large and deep excavation has been successfully carried out by the open-cut excavation method with two earth retaining walls through the thick Holocene Nakanoshima clay deposit. In the present study, a case history of the excavation for the construction of a subway station is numerically back analyzed. In the analysis, a finite element method based on a Biot's type of two-phase mixture theory is adopted, and an elasto-viscoplastic model which considers structural changes is used. A comparison between the results of the numerical analysis and the measurements shows that the simulation method can efficiently reproduce the deformation of earth retaining walls. In addition, it is confirmed that the construction has been successfully executed without significant damage to the earth retaining walls or to the Holocene clay deposit.