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2020 Vol.19, Issue 2

Research Article

Evaluation of Lateral Subgrade Reaction Coefficient Considering Empirical Equation and Horizontal Behavior Range of Large Diameter Drilled Shaft

경험식을 통한 대구경 현장타설말뚝에 대한 수평지반반력계수와 수평거동 영향범위의 평가

Woo-Yeol Yang1
,
Tae-Hyun Hwang2
,
Bum-Joo Kim3
,
Seong-Bak Park4
,
Kang-Il Lee5*
양 우열1
,
황 태현2
,
김 범주3
,
박 성백4
,
이 강일5*
1Member, Ph.D Candidate, Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
2Member, Adjunct Professor, Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
3Member, Professor, Department of Civil and Environmental Engineering, Dongguk University, 30 Pildong-ro 1-gil, Jung-gu, Seoul 04620, Republic of Korea
4Member, Ph.D Candidate, Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
5Member, Professor, Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
* Corresponding Author
30 June 2020. pp. 1-11
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Abstract

대구경 현장타설말뚝의 수평지지 특성은 말뚝의 강성, 인접지반의 수평지반반력에 따라 크게 좌우된다. 특히 말뚝설계 시 많이 활용되는 경험적인 수평지반반력계수는 그 결과의 값에 따라서 지지력의 차이가 크므로 수평지지력을 평가하는 데 매우 중요한 요소임에도 불구하고 대구경 현장타설말뚝에 대한 지반반력계수의 평가가 미흡한 실정이다. 또한, 말뚝의 취약부인 수평하중에 대한 영향범위와 최대 모멘트의 발생위치는 서로 상관관계가 있을 수 있고, 수평하중에 대한 말뚝의 보강영역을 판단하는데 주요 고려사항임에도 기존 연구에서는 이 관계에 대해 평가되지 않았다. 이에 본 연구는 대구경 현장타설말뚝의 수평지반반력계수를 평가하고, 말뚝의 영향범위(1/β)와 최대 모멘트의 발생위치(zm)의 관계를 조사하고자 대구경 현장타설말뚝에 대한 현장시험과 비선형 해석을 수행하였다. 연구결과, 대구경 현장타설말뚝의 수평지지력은 경험식을 통한 산정결과에 따라 최대 190%정도 차이를 보였다. 또한, 말뚝의 수평거동에 대한 영향범위와 최대 모멘트의 발생위치의 관계는 지반조건에 따라 선형적 관계인 것으로 평가되었다.

The lateral bearing characteristics of large diameter drilled shaft depend greatly on the stiffness of the pile, horizontal subgrade reaction of adjacent ground. In particular, the empirical evaluation results of the horizontal subgrade reaction coefficient which are widely used in pile design are very important factors in evaluating the lateral bearing capacity of drilled shaft because the difference in bearing capacity depends on the estimated result. Nevertheless, the evaluation of the horizontal subgrade reaction coefficient on the large diameter drilled shaft is insufficient. In addition, although the range of influence and the location of the maximum moment which is the weaken zone on the pile may be correlated and relationship of these are major consideration in determining the reinforced zone of drilled shaft, the previous studies have not been evaluated it. In this study, the field test and nonlinear analysis of large diameter drilled shaft were performed to evaluate the horizontal subgrade reaction coefficient and to investigate the relationship between the influence range 1/β of the pile and the location of the maximum moment zm. In the result, the lateral bearing capacity of drilled shaft showed a difference in results by about 190% according to the empirical equation on the horizontal subgrade reaction coefficient. And the relationship between the influence range of the pile and the location of the maximum moment was evaluated as a linear relationship depending on the soil density.

Keywords
Drilled shaft
Field lateral loading test
Nonlinear analysis
Subgrade reaction coefficient

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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 : 19
  • No :2
  • Pages :1-11
  • Received Date : 2020-03-04
  • Revised Date : 2020-05-18
  • Accepted Date : 2020-06-01
  • DOI :https://doi.org/10.12814/jkgss.2020.19.2.001
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