Long-term settlement of the marine foundation due to construction of 1th phase Kansai international airport

摘要

A series of elasto-viscoplastic finite element analyses is performed to assess the stress and deformation of the marine foundation due to construction of Kansai International Airport (KIA) fill. The foundation is modeled by following the stratification at offshore reclamation site. A new concept in terms of occurrence of viscoplastic behavior even in the quasi-overconsolidated region is incorporated into finite element code in order to simulate the long-term deformation of the Pleistocene clay deposits in Osaka Bay. Attention is also paid to the modeling of permeability for Pleistocene sand gravel layers considering the sedimentation environment because the performance of excess pore water pressure is strongly dependent on the extent as well as the change in thickness of those permeable sand gravel layers. The mechanism for the propagation of excess pore water pressure is also discussed. It is very important to know how far the excess pore water pressure generated due to reclamation propagates for assessing the effect of adjacent reclamation on the existing reclaimed land. From those findings on the performance of excess pore water pressure, the mode of advance in settlement of Pleistocene deposits is discussed.