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The Lateral Load Capacity of Bored-Precast Pile Depending on Injecting Ratio of Cement Milk in Sand

사질토 지반에서 시멘트밀크 주입비에 따른 매입말뚝의 수평지지력

Won-Pyo Hong1
,
Jung-Mann Yun2*
홍 원표1
,
윤 중만2*
1Professor, School of Civil and Environmental Engineering, Urban Design and Study, Chung-Ang Univ.
2Professor, Department of Construction Information System, Shin Ansan Univ.
*교신저자. *Corresponding Author. 
30 December 2013. pp. 99-107
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Abstract

In order to investigation Lateral bearing capacity of bored-precast pile, we carried out the analysis of the relationship between Lateral load and horizontal displacement using the result of horizontal pile load test. The six piles injected cement milk of 50%, 70% and 100% of the embedded length of pile were used in the horizontal pile load test. The horizontal displacement, yielding load and horizontal bearing capacity are mainly affected by The injecting ratio of cement milk (injected length of cement milk/embedded length of pile). As the injecting ratio of cement milt is increased, the starting point of horizontal displacement in piles become close to the ground surface and the amount of horizontal displacement is decreased. Also, the horizontal bearing capacity and yielding load are highly increased with increasing the ration of cement milk. The horizontal bearing capacity and yielding load of bored pile with 1 of cement milk ratio are about two or three times those of pile with 0.5 of cement milk ratio.

Keywords
Bored-Precast pile
Lateral bearing capacity
Yield load
Lateral load test
Horizontal displacement

매입말뚝의 수평저항 특성을 고찰하기 위하여 매입말뚝에 대한 수평재하시험을 실시하여 수평하중과 수평변위관계를 분석하였다. 말뚝수평재하시험은 시멘트 밀크가 말뚝매입길이의 50%, 70%, 100%로 주입된 6개의 말뚝에 대하여 실시하였다. 시멘트 밀크의 주입비(시멘트 밀크 주입길이/말뚝의 길이)는 매입말뚝의 수평변위, 항복하중, 수평지지력에 큰 영향을 미치는 것으로 나타났다. 시멘트 밀크의 주입비가 증가할수록 매입말뚝의 수평변위가 발생되기 시작하는 위치는 지표면에 가까워지며 말뚝의 수평변위는 감소한다. 그리고 말뚝의 수평지지력과 항복하중은 시멘트 밀크 주입비가 증가할 수록 크게 나타났다. 시멘트 밀크 주입비가 1인 매입말뚝의 항복하중과 극한수평지지력은 시멘트 밀크 주입비가 0.5인 경우보다 약 2∼3배 정도 크게 나타났다.

References
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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 12
  • No :4
  • Pages :99-107
  • Received Date : 2013-12-06
  • Revised Date : 2013-12-23
  • Accepted Date : 2013-12-24
  • DOI :https://doi.org/10.12814/jkgss.2013.12.4.099
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