말뚝두부에 무시할 수 없을 정도의 큰 횡력이 작용할 때 이에 대한 합리적인 해석이 있어야 한다. 이같은 해석에 있어서는, 말뚝과 말뚝 주위 지반과의 복잡한 상호작용 때문에 어려움이 많다. 본 연구의 목적은 말뚝 주위 지반을 탄소성체로 가정하고, 말뚝과 지반사이 경계요소를 가정하여 유한요소법에 의해 삼차원 해석 프로그램을 개발하는데 있다. 본 연구의 결과, 지반을 탄소성체로 가정한 해석결과가 현장측정치와 잘 일치함과, 말뚝과 주위지반의 불연속성을 환경요소로 극복할 수 있음과 경계요소의 두께 변화가 해석결과에 큰 영향을 주지 않으나, 되도록 얇게 함이 정도 높은 결과를 얻음을 확인하였다.
Reasonable solutions are needed when the lateral load acting on the head of a pile can not be ignored. There are many difficulties in analyzing the displacement of a laterally loaded Pile because of the complex interaction between the pile and the surrounding soil. In this paper, assuming that a pile and surrounding soil are elasto-plastic mass, and discontinuity between the two is connected with interface elements, writers have tried to solve the problem by using three-dimensional finite element method. Furthermore, the results of numerical analysis obtained by the developed program in this study have been compared with measured field values. The conclusions of this study are as follows; 1. Assuming that the soil behaves as an elasto-plastic mass, there has been a good agreement with measured field displacements. 2. It has been confirmed that interface elements overcome discontinuity between a pile and surrounding soil. 3. As the thickness of interface elements Increases, the stress and the displacement decrease. Al- though the difference is not significant, good results can be expected when it is as thin as possible.
