Kenta WATANABE
Research on the horizontal resistance characteristic of combined footing foundation that uses solidification improvement together with sheet piles
Satoru Ohtsuka
When the structure such as retaining walls is constructed on the soft subsoil, the solidification improvement is often constructed as a measure of bearing capacity and settlement. However, the horizontal resistance force is insufficient in the structure with a large ratio of the horizontal loads compared with the vertical loads. So, Fukada is developing combined footing foundation method that uses sheet piles together with solidification improvement. This method is able to have the horizontal resistance force that is bigger than spread foundation because increase of the rigidity of the foundation and the periphery friction are expected.
To understand the horizontal resistance characteristic of a structure concerned, simulates it by the three-dimensional elastoplasticity finite element analysis. Moreover, the shearing force and the tensile force acts in the improvement body by the outside force. Therefore, the elastoplasticity composition type that both failure criterions of shear and tensile are set is demanded. The transformation controlling effect by sheet piles using together is quantitatively evaluated by using this composition type. The result of the present study is shown as follows.
(1)The transformation resistance characteristic increases by using sheet piles. When sheet piles is used together with the solidification improvement, the effect becomes larger. When the strength of the solidification improvement is larger, the effect becomes larger.
(2)The horizontal resistance characteristic of a structure concerned can be quantitatively roughly evaluated by the three-dimensional elastoplasticity finite element analysis. On the other hand, the rotation resistance characteristic can be qualitatively evaluated.
(3)The tensile softening model was built into the three-dimensional elastoplasticity finite element analysis. As a result, the tensile softening behavior of the improvement body is expressible. Moreover, behavior in the state of close is expressible too
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