Tadatsugu Tanaka

Elasto-Plastic Finite Element Collapse Analysis of Retaining Wall by Excavation

In a retaining wall with excavation, active earth pressure and passive earth pressure co-exist There have been few suitable models concerning the collapse analysis of retaining structure including complex earth pressure conditions. In this study we attempted to clarify the rotating failure of a retaining structure with excavation by the finite element analysis with the implicit-explicit dynamic relaxation method. By comparing the results of model experiments with those of the finite element analysis, we evaluated the applicability of the finite element analysis for rotating failure of the retaining structure. The displacement calculated by the finite element analysis agreed well with those of model experiments. We also showed the maximum shear strain and earth pressure distribution.

Model Tests of the Influence of Reinforcement on Levee Stability

Tests were performed on models of reinforced and unreinforced levees in order to compare levee stability during horizontal and vertical deformations of the soil base. It was shown that reinforcement of levees can greatly increase their stability.

Stressed and Deformed Condition of the Grounds Around Driven Piles

The paper highlights the soil characteristics on the territory of the Republic of Kazakhstan along with the basic theses of the elastic and plastic soil models elaborated by the authors through solving the physical non-linear mixed problem of the elasticity and plasticity theory to describe the initial stressed and deformed condition of water saturated grounds with consideration of the pore pressure.