In this study, for using effectively domestic (temperate) small and medium diameter logs as a wooden floorboard, cross-laminated wood panels were manufactured using domestic larch and tulip woods as a base material for teak and merbau wood flooring, and static bending strength performances were measured to investigate the applicability as the base materials of wooden flooring in place of plywood. Static bending MOE was much influenced by the strength performances of the top layer lamina than that of the laminae for base materials. Bending MOR showed the higher values in tulip wood that was hardwoods than in larch wood that was softwoods regardless of the strength performances of the top layer laminae, and it was found that the values were much influenced by the strength performances of the base materials used in the core and bottom layers. However these values were 1.4-2.5 times higher values than the bending strength of the wooden floorboards specified in KS, it was found that it can be sufficiently applied to the base materials of wooden floorboards in place of plywood.

According to the design code of construction for port and harbor facilities in Japan, ground that has sand size content between 50% and 80% is called intermediate soils, because of its intermediate behavior between sand and clay. Though intermediate soils with low plasticity are likely to be under partially drained conditions, stability analysis and evaluation of the shear strength for intermediate soil has been carried out based on undrained conditions. The drainage characteristics of the soil were estimated; that is, it was estimated whether the ground is under fully undrained conditions or partially drained conditions using CPTU data. The partially drained shear strength was estimated from the analysis of the distribution characteristics of CPTU based shear strength between the undrained shear strength line and the fully drained shear strength line, which was ranged approximately from φ´=5º to φ´=15º, similar to ranges of back analysis for the estimation of replacement depths.

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