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Journal of the Korean Society of Hazard Mitigation 2012;12(2):71-78.
Published online April 30, 2012.
점토지반에 설치된 말뚝의 하중전이 특성
이승현, 권오순
Load Transfer Characteristics of a Pile installed in Clay
Seung Hyun Lee, Oh Soon Kwon
Abstract
In order to investigate axial load transfer characteristics of a steel pipe pile installed in clay, three kinds of load transfer curves were used for analysis and results of analysis were compared each other. Two kinds of clay were considered for analysis and one of which has constant distribution of elastic modulus and undrained shear strength with depth and the other has linear distribution of those with depth. t-z curves obtained from the analysis show that pile displacements needed to develop maximum skin load transfer are less than the generally known displacement of 5~10 mm. It can be seen from the results of analysis that the amount of load transferred to pile point was small whereas the load transferred to pile point has major effect on the development of ultimate pile load capacity. Initial stiffness of load carrying capacity of a pile was mainly affected by the soil properties near the upper portion of a pile.
Key Words: Axial load transfer; Elastic modulus; Undrained shear strength; t-z curve; Initial stiffness
요지
점토지반에 설치된 강관말뚝의 축방향 하중전이특성을 파악하기 위해 세 가지 하중전이법을 적용하고 해석을 수행하여 그 결과를 상호 비교하였다. 해석지반은 탄성계수와 비배수강도가 말뚝근입깊이에 대하여 일정한 경우와 비례하는 경우를 고려하였다. 해석을 통해 구한 t-z 곡선을 살펴볼 때 극한단위주면마찰력이 발현되는데 필요한 변위량은 일반적으로 알려진 5~10 mm보다 작은 값을 보였다. 해석을 통해 얻은 하중-침하곡선을 살펴볼 때 말뚝선단에 전이되는 하중은 말뚝머리하중에 비해 상당히 작았으나 말뚝에 있어 뚜렷한 극한지지력 발현과 관련하여 큰 역할을 함을 알 수 있었다. 말뚝의 하중-변위곡선에 있어서의 초기 강성은 말뚝머리 근처 지반의 특성값에 큰 영향을 받음을 알 수 있었다.
핵심용어: 축방향 하중전이; 탄성계수; 비배수강도; t-z 곡선; 초기강성


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