장변위공내재하시험기를 이용한 철도교 기초의 p-y곡선에 관한 연구

Abstract

Applied lateral load and moment on railway bridge foundation are usually larger than other transportation bridge foundation. Therefore, high strength steel pipe piles are used for Honam high speed railway bridges to resist lateral load and moment, even though those are much more expensive than concrete piles. It is very important to measure soil characteristic under lateral load from piles in order for economical design. A large displacement borehole testmeter (LDBT) is developed to measure nonlinear characteristics of the soil applied bored pile in this study. Most in-situ borehole test devices to estimate p-y curves can measure low displacement range in soil, which is usually in elastic range. Non-linear characteristics of the soil which is one of the most important characteristics of the soil cannot be obtained. The research result shows that the measured p-y curves using LDBT can be properly matched with back-calculated p-y curves from field tests by applying scale effects for sand. The developed technique using LDBT is verified lateral load test comparing with pile head deflection under field.