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2020 Vol.19, Issue 3 Preview Page

Research Article

Lateral Bearing Characteristics of Large Diameter Drilled Shafts by Casing Reinforcement Condition Using Non Linear Analysis

비선형해석을 이용한 케이싱 보강조건에 따른 대구경 현장타설말뚝의 수평거동특성

Jin-Ho Yoo1
In-Jong Moon2
Kang-Il Lee3*
유 진호1
문 인종2
이 강일3*
1Member, Ms Candidate, Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
2Member, Ph.D Candidate, Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
3Member, Professor, Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
* Corresponding Author
30 September 2020. pp. 23-33
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Abstract

대구경 현장타설말뚝의 경우 수평지지특성은 중요한 요소이며 이를 증가시키기 위한 방안은 말뚝의 인접지반을 개량하여 강성을 증가시키는 방법과 말뚝 자체의 강성을 증가시키는 방법이 있다. 이중 말뚝체에 케이싱을 보강하여 강성을 증가시키는 방법이 많이 제안되고 있는 추세이지만 이와 관련된 연구는 거의 이루어지지 않고 있는 실정이다. 따라서 본 연구에서는 지반조건에 따라 대구경 현장타설말뚝의 적정 케이싱 보강길이를 평가하기 위해 비선형해석을 이용하여 지반조건별로 케이싱 보강길이에 따른 수평지지특성을 연구하였다. 그 결과 대구경 현장타설말뚝의 수평지지특성은 케이싱 보강 길이비(κ)가 1.2인 경우 가장 효과적이며 지반조건에 따라서는 느슨한 지반일수록 큰 보강효과를 나타내었다.

The lateral bearing characteristics are important factors in the case of large diameter drilled shafts and the measures to increase this are to improve the adjacent ground of the pile to increase the rigidity and to increase the rigidity of the pile itself. There are many suggestions for increasing rigidity by reinforcing casing on the pile, but few studies have been done related to this. Therefore, in this study, the lateral bearing characteristics according to casing reinforcement length were studied for each ground condition using non-linear analysis to evaluate the appropriate casing reinforcement length of the large diameter drilled shafts depending on the ground conditions. As a result, the lateral bearing characteristics of the large diameter drilled shafts are most effective if the casing reinforcement length ratio is 1.2, and depending on the ground conditions, the more loose the ground, the greater the reinforcement effect.

Keywords
Lateral bearing characteristics
Drilled shaft
Nonlinear analysis
Casing reinforcement length
References
1
Baek, H. D. (1998), "Analysis of laterally loaded piles by p-y curve", Master Thesis, Kyonggi University.
2
Bowles, J. E. (1988), "Foundation Analysis and Design: 4th Edition", McGraw-Hill, New-York, pp.623-637.
3
Bowles, J. E. (1997), "Foundation Analysis and Design: 5th Edition", McGraw-Hill, New-York, pp.501-506.
4
Chen, W. W. (1978), "Discussion: Lateral Load Piles: Program Documentation", Journal of Geotechnical Engineering Division, ASCE, Vol.103, GT1, pp.161-162.
5
Broms, B. (1964), "The Lateral Resistance of Piles in Cohesionless Soils", Journal of Soil Mechanics and Foundations Division, ASCE, Vol.90, SM2, pp.123-156.
6
Hong, W. P. and Yun, J. M. (2013), "The Lateral Load Capacity of Bored-Precast Pile Depending on Injecting Ratio of Cement Milk in Sand", Journal of Korean Geosynthetics Society, KGSS, Vol.12, No.4, pp.99-107.
10.12814/jkgss.2013.12.4.099
7
Hukuoka, M. (1966), "Damage to civil engineering structures", Soils and Foundations, Japanese Geotechnical Society, Vol.6, No.2, pp.125-145.
10.3208/sandf1960.6.2_45
8
Jeong, S. K., Kwak, D. O., Ahn, S. Y., and Lee, J. K. (2006), "A Study on the Lateral Behavior of Pile-Bent Structures with P−Δ Effect", Journal of the Korean Geotechnical Society, KGS, Vol.22, No.8, pp.77-88.
9
KGS (2015), "Design Code of Structure Foundation", CIR, Seoul, pp.343-351.
10
KR (2012), "Design of Pile Foundation", pp.15-16.
11
Lee, K. W., You, S. K., Park, J. J., and Hong, K. W. (2019), "An Expreimental Study on Bearing Capacity of Drilled Shaft with Mid-size", Journal of Korean Geosynthetics Society, KGSS, Vol.18, No.4, pp.263-272.
12
Matlock, H. (1970), "Correlations for design of laterally loaded piles in soft clay", Proceedings of the II Annual Offshore Technology Conference, pp.577-594.
10.4043/1204-MS
13
NAVFAC (1986), "Foundations and Earth Structure", NAVFAC Design Manual 7.2, Naval Facilities Engineering Command, Alexandria, VA., pp.7.2-177-7.2-234.
14
Reese, L. C., W. R. Cox and F. D. Koop (1974), "Field testing and analysis of laterally loaded piles in sand", Proceedings of the VI Annual Offshore Technology Conference, pp.473-485.
10.4043/2080-MS
15
Ryu, J. C. (2003), "Analysis of lateral behavior of pile using p-y curve method", Ph.D. Thesis, Chungnam University.
16
Vesic, A. B. (1961), "Bending of beams resting on isotropic elastic solid", Journal of the Engineering Mechanics Division, ASCE, Vol.87, No.2, pp.35-54.
17
Yang, W. Y. (2020), "Lateral Bearing Characteristics of Pile Bent System by Reinforced Length of Casing", Ph.D. Thesis, Daejin University.
18
Yang, W. Y., Hwang, T. H., Kim, B. J., Park, S. B., and Lee, K. I. (2020), "Evaluation of Lateral Subgrade Reaction Coefficient Considering Empirical Equation and Horizontal Behavior Range of Large Diameter Drilled Shaft", Journal of Korean Geosynthetics Society, KGSS, Vol.19, No.2, pp.1-11.
Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 19
  • No :3
  • Pages :23-33
  • Received Date :2020. 08. 03
  • Revised Date :2020. 09. 03
  • Accepted Date : 2020. 09. 08
  • DOI :https://doi.org/10.12814/jkgss.2020.19.3.023
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