근입비와 인발속도가 콘크리트 항타말뚝의 인발부착계수에 미치는 영향

Effect of Embedment Ratio and Loading Rate on Uplift Adhesion Factor of Concrete Driven Pile

  • 김종인 (인천대학교 일반대학원 토목환경시스템공학과) ;
  • 박정준 (인천대학교 일반대학원 토목환경시스템공학과) ;
  • 신은철 (인천대학교 공과대학 토목환경시스템공학과)
  • 발행 : 2005.08.01

초록

Pile foundations are utilized when soil is so weak that shallow foundations are not suitable or point load is concentrated in small area. Such soil can be formed by the land reclamation works which have extensively been executed along the coastal line of southern and western parts of the Korean Peninsula. The working load at pile is sometimes subjected to not only compression load but also lateral load sad uplift forces. But in most of the practice design, uplift capacity of pile foundation is not considered and estimation of uplift capacity is presumed on the compression skin friction. This study was carried out to determine that the effect of embedment ratio and loading rate on uplift adhesion factor of concrete pile driven in clay. Based on the test results, the critical embedment ratio is about 9. Adhesion factor is constant under the critical embedment ratio, and decreasing over the critical embedment ratio. Also, adhesion factor is increased with the loading rate is increased.

키워드

참고문헌

  1. 신은철, 김종인, 박정준, 이학주, (2001), '점토지반에 타입된 콘크리트 말뚝의 인발저항 및 크리프 거동', 한국지반공학회 학술 발표회논문집, pp.371-378
  2. 이재동 (2001), '현장모형시험을 통한 화강풍화토 지반에서의 매입말뚝의 인발저항력' 충북대학교 박사학위논문
  3. Burland, J.B. (1973) 'Shaft friction of Piles in Clay-A Simple Fundamental Approach', Ground Engineering, Vol.6, No.3, pp.30-42
  4. Chattopadhyay, B. C. and Pise, P. J., (1986) 'Uplift Capacity of Piles in Sand', Journal of Geotechnical Engineering, ASCE, Vol.112, No.9, pp.888-904
  5. Das, B.M., and Seeley, G.R. (1982), 'Uplift Capacity of Pipe Piles in Saturated Clay', Soils and Foundations, The Japanese Society and Foundation Division, ASCE Vol.89, No.SM3, pp.63-94
  6. Meyerhof G.G. and Adams, J.I. (1968), 'The Ultimate Uplift Capacity of Foundation', Canadian Geotechnical. Journal., Vol.5, No.4, pp.225-244 https://doi.org/10.1139/t68-024
  7. Tomlinson, M.J.(1971), 'Some Effects of Pile Driving on Skin Friction', Proceedings of Conference on Behaviour of Piles, ICE, London, pp.107-144
  8. Vijayvergiya, V.A. and Focht Jr., J.A. (1972), 'A New Way to Predict Capacity of Piles in Clay', Proceedings, 4th Offshore Technology Conference, Houston, Texas, 2, pp.856-874
  9. Whitaker T. and Cooke R.W., (1966), 'Large Board Piles' Proceedings of the Symposium organized by the Institution of Civil Engineers and the Reinforced Concrete Association at the Institution of Civil Engineers, London, February, pp.6-49