In existing researches connected with landslide, natural slope was regard as a parallel slope, but it was found that many landslides were occurred on the concave and convex slopes besides parallel slopes. This study was performed to evaluate the effect of shape and length of slope and soil depth for slope stability analysis and to compare infinite slope analysis with circular failure analysis for grid by grid analysis in prediction of GIS-based landslide hazard. As grid size is increased, average slope and curvature were decreased and the decreasing tendency was prominent in mountainous areas. Comparing infinite slope analysis and circular failure analysis for various degree of slope and soil depth, safety factor by infinite slope analysis is larger than that by circular failure analysis. Result showed that the factor safety depends on the shape of slope which is composed of two continuous slopes, if grid size is small (such as 5 m脳5 m). So after due consideration for soil depth and topography, proper slope stability analysis must be performed.
This paper introduces PDT (Pulse Discharge Technology) piling method. The PDT piling method is to install in-situ piles using electrical power so called Pulse power. Since this piling technique can make not only a bore hole to be expanded but also the ground to be improved by compaction, the pile installed by PDT appears to be able to develop shaft and end bearing capacity efficiently. In this study, we introduce a coefficient of expansion. In order for quantitative evaluation of the relation between pulse power and ground expansion a series of in-situ tests are conducted. In the tests, we divide soil conditions into several groups by constituents and the number of blows in standard penetration test, N. The tests are carried out on various numbers of pulse discharge. As a result, it is concluded that the coefficient of expansion appeared to increase with an increase of the number of discharge and with a decrease of the number of blows, N. In addition, the coefficient of expansion appears to differ from one position to another even though having the same N value.
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