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모래地盤에서 反復水平荷重을 받는 무리말뚝의 擧動特性 원문보기
Behavior characteristics of group piles under repeated lateral loads in sand

  • 저자

    김태용

  • 학위수여기관

    慶尙大學校 大學院

  • 학위구분

    국내박사

  • 학과

    토목공학과

  • 지도교수

  • 발행년도

    2004

  • 총페이지

    iv, 190p.

  • 키워드

    모래지반 반복수평하중 무리말뚝 토목공학;

  • 언어

    kor

  • 원문 URL

    http://www.riss.kr/link?id=T10060041&outLink=K  

  • 초록

    It is hard to analyze theoretically that the theoretical research of the behavior characteristics of single pile and group piles under lateral loads contains a lot of problem due to several ambiguous elements; intervening efficiency with correlated piles, ambiguity of boundary condition between pile-soil-pile, inhomogeneous ground, movement of fine soil according to the ground water fluctuation, and so on. In addition, the research of behavior characteristic through the field test is hard to be carried out due to the expensive experiment cost and variation of ground condition. Therefore, the necessity of model test is on the increase because performing it is able to solve these problem, probate the analytical result, and evaluate the interaction between pile and ground quantitatively under various circumstances. In this study, on group piles as well as single pile under repeated lateral loads, it was examined that both behavior characteristic and change in efficiency according to the action type of load and action direction through a model test. Secondly, it was considered that the behavior characteristics of single pile and group piles which were appeared when the pile arrangement, space ratio, and relative density were changed at the load step which is not affected by repeated load. Finally, it was presented that reasonable, and economical arrangement interval of group piles which could be applied to design as well as construction of group pile foundation, and based on this case, group efficiency formulas were presented as following. The following results were obtained ; 1. On single and group piles under repeated lateral loads, maximum lateral resistance which based on the displacement of the pile head, when load was one-way, was increased as load was repeatedly applied regardless of pile arrangement; however, for the two-way load, maximum lateral resistance was steadily decreased and rotated in the same direction as the initial load. 2. On group piles under repeated lateral loads, the load distribution was in the order of front row, middle row and trail row for square arrangement. As load was repeatedly applied, the load distribution in front and middle rows were reduced, while that of the trail row increased. For the zigzag arrangement, which was in the order of front row and trail row; as load was repeatedly applied, which of front row steadily decreased however, that of the trail and middle rows increased little by little. 3. On group piles under repeated lateral loads, group efficiency resulted in each load step proved to be larger for zigzag arrangement than square arrangement regardless of relative density, space ratio, and loading types. 4. On group piles under repeated lateral loads, the increase ratio of group efficiency resulted from repeated load, the load was one-way, did not show any significant difference after repeated load of two times regardless of relative density of the ground, and the change of interval ratio; however, the decrease ratio of group efficiency resulted from repeated load, when the load was two-way, did not show any significant difference after repeated load of three times regardless of load way, relative density of the ground, and space ratio. 5. The critical space of group piles on a ground over the medium relative density was 7D for square arrangement and 9∼12D for zigzag arrangement when the load was one-way, while 7∼8D for square arrangement and 6.5D for zigzag arrangement. 6. On group piles under repeated lateral loads, a calculation was made on the average group efficiency not affected by repeated load, and based on these data, group efficiency formulas were presented as following. ◁수식 삽입▷(원문을 참조하세요)


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