미얀마 퇴적지반에 근입된 현장타설말뚝의 마찰거동 특성

Abstract

Friction piles are being constructed in Southeast Asia (Myanmar, Cambodia, Vietnam, etc.) where the soft ground is deep, and many cases of friction piles are accumulated in terms of experience. Since many companies in Korea are entering Southeast Asia, it is necessary to understand the problems of sufficient experience of friction piles and construction cases. However, in Korea, it is not certain that the conventional formula for the design of friction piles is established. In this study, we used the results of four static load tests and load transfer tests conducted in Myanmar sites to analyze the skin friction of soil layer. In addition, we proposed a relationship chart with skin friction measured in the N-value of Split spoon sampler tests (SPT) and the load transfer test results of the single drilled shaft. In the case of Myanmar sites, the range of soil layers was deeper than domestic sites, so the conventional formula of skin friction using the N-value of SPT is different from that of domestic sites. In sandy layer, fs = 0.096 N in Myanmar sites showed a similar result of the domestic fs = 0.106 N. In clayey layer, fs = 0.315 N, in Myanmar sites showed about 5.0 times higher than the domestic fs = 0.062 N. The results of this study are based on limited data. Therefore, if we analyze the results of more load transfer tests, we can suggest a conventional formula for skin friction according to the N-value. It is expected to be used as important basic data in the future.