Kon Takaaki
Proposal and Evaluation of construction management method of earthwork structures using numerical experiment
Ohtsuka Satoru
Structures do not show behavior as expected design in many cases. It often show an unexpected behavior of the designer and affect the original design. This is due to various uncertainties interposed between the design and construction. In order to take into account the uncertainties, construction management by dynamic observation is necessary. Also, earthwork structures easy to represent the unexpected behavior.¡¡Therefore, already some of the construction management method in earthwork structures have been proposed and are practical. This study was focused on the construction management method of embankment on the soft ground. First, we evaluated the previous method by numerical experiments. Then, we have proposed a new construction management method based on it.
Among the traditional construction management method, such as Matsuo Kawamura method and Kurihara Takahashi method and Tominaga Hashimoto method is often used in the field. In these methods,¡¡central subsidence, toe-of slope side displacement amount, and time variation of them are used as observed value. As a result of numerical analysis, it was found that a method which uses a central subsidence amount is not been able to evaluate embankment width properly . In this study, we have proposed a method of using a subsidence amount at edge of crown¡¡instead of the center subsidence amount. Furthermore, the proposed method is able to improve pointed out problems, also showed the possibility that can be applied destruction criteria line of Matsuo Kawamura method.
Because the ground of the parameters that were used for the analysis in this study was only Kashiwazaki, Niigata of clay, it can be said that it could not sufficiently considered. Future, it is necessary to consider a wide range of soil conditions. Moreover, not only loading issues such as embankment, it is desired to consider the same for unloading issues such as Cut slope.
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