Abstract
진동해머에 의해 시공되는 말뚝의 거동을 분석할 목적으로 개발된 기존의 프로그램을 개선하고자 하였다. 진동해머-말뚝-지반으로 구성되는 진동시스템의 기존 지배방정식에 지반저항의 댐핑효과와 클러치마찰력을 추가하였다. 또한, 개발된 해석기법의 하중전이곡선을 모사하는 수정 Ramberg-Osgood 모델의 매개변수를 재산정하여 해석기법을 개선하고자 하였다. 수정된 프로그램에 의한 해석결과를 현장시험결과와 비교해 볼 때 시간에 따른 말뚝의 변위 및 하중전이거동이 현장시험결과에 좀 더 유사하였다. 개발된 프로그램에 의한 말뚝 관입깊이별 관입속도를 상용 프로그램에 의한 결과 및 현장시험결과와 비교해 볼 때 상용프로그램보다 훨씬 더 현장시험결과에 가까웠다. Enhancement of the existing program for analyzing a pile driven by vibro hammer was tried. Damping effect of dynamic soil resistance and clutch friction were added to the existing governing equation which constitute vibrating system of vibro hammer-pile-soil. Parameters of the modified Ramberg-Osgood model which simulates dynamic load transfer curves for the developed program were recomputed. Comparing the results of the modified program with those of the field tests, pile displacement with time and load transfer behavior were more similar to those of the field test. The penetration rates obtained from the modified program were more close to those of the field test rather than those of the commertical program.
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