All Issue

2017 Vol.33, Issue 6 Preview Page
A Study on Bearing Capacity Reinforcement for PHC Pile Foundation Using Post-grouting

그라우팅 기법을 활용한 PHC 파일 기초의 지지력 증강 효과 연구

Min-Taek Yoo1
,
Su-Hyung Lee2
,
Seok-Jung Kim3*
,
Yeong-Tae Choi1
,
Jeongjun Park4
유 민택1
,
이 수형2
,
김 석중3*
,
최 영태1
,
박 정준4
1Senior Researcher, High-speed Railroad Systems Research Center, Korea Railroad Research Institute
2Principal Researcher, Urban Railroad Research Team, Korea Railroad Research Institute
3Post-Doctoral Researcher, Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology
4High-speed Railroad Systems Research Center, Korea Railroad Research Institute
1한국철도기술연구원 첨단인프라연구팀 선임연구원
2한국철도기술연구원 도시교통실용화연구팀 책임연구원
3한국건설기술연구원 지반연구소 신진연구원
4한국철도기술연구원 첨단인프라연구팀 선임연구원
*교신저자. *Corresponding Author. 
30 June 2017. pp. 17-25
PDF XML Citation
Abstract

In this research, post grouting methods were applied on PHC piles, and static load tests were conducted to confirm the effect of post grouting on bearing capacity enhancement of PHC piles. Grouting pressures of 1.9 MPa and 3.5 MPa were applied, and bearing capacities of grouted piles were compared with that of non-grouted pile. From the static load test results, the bearing capacities of grouted piles were about 3 times higher than that of non-grouted pile. In addition, the design efficiency (allowable bearing capacity/nominal bearing capacity) increased from 32% to 97% after post grouting, and the axial stiffness of piles also increased by about 1.3 times per grouting pressure.

Keywords
Post-grouting
Bearing capacity
Static load test
PHC pile

본 연구에서는 매입식 PHC 기성말뚝에 대한 포스트 그라우팅 공법을 적용하고, 정재하 실험을 수행하여 포스트그라우팅 공법의 지지력 증강효과를 확인하였다. 그라우팅 압력은 1.9MPa 및 3.5MPa을 적용하였으며, 그라우팅을 수행하지 않은 미보강 말뚝과의 지지력을 비교하였다. 정재하 실험 결과를 바탕으로 PHC 말뚝의 지지력을 분석한 결과, 말뚝의 항복 하중은 약 3배 이상 증가하였으며 설계효율은 당초 32%에서 97%로 증가하였다. 또한, 그라우팅 공법을 적용한 말뚝의 축방향 강성은 그라우팅 주입압의 약 1.3배 비율로 증가하였다.

References
1
Bustamante, M., Gambin, M., and Gianeselli, L. (2009), “Pile Design at Failure Using the Menard Pressuremeter: an Update”, In Contemporary Topics in In Situ Testing, Analysis, and Reliability of Foundations, pp.127-134.
2
Dapp, S. D. and Mullins, G. (2002), “Pressure Grouting Drilled Shaft Tips: Full-scale Research Investigation for Silty and Shelly Sands”, In Deep Foundations 2002: An International Perspective on Theory, Design, Construction, and Performance, pp.335-350.
3
Dapp, S. and Brown, D. (2010), “Evaluation of base Grouted Drilled Shafts at the Audubon Bridge”, In GeoFlorida 2010: Advances in Analysis, Modeling & Design, pp.1553-1562.
4
Fernandez, A. L., Pando, M. A., and King, P. G. (2007), “Load Test Program to Validate Model for Post Grouted Drilled Shafts”, In Contemporary Issues In Deep Foundations, pp.1-11.
5
Fu, X. and Zhou, Z. (2003), “Study on Bearing Capacity of Bored Cast-in-situ Piles by Post Pressure Grouting”, In Grouting and Ground Treatment, pp.707-715.
6
Ho, C. E. (2003), “Base Grouted Bored Pile on Weak Granite”, In Grouting and Ground Treatment, pp.716-727.
7
KGS (2015), Explanation of foundation structure design criteria, Korean Geotechnical Society (in Korean).
8
KLHC (2010), Specification of housing construction, 30535 preboring method, Korea Land & Housing Corporation (in Korean).
9
Kwon, O. S., Jung, S. M., and Choi, Y. K. (2011), “A Case Study of Post-Grouted Drilled Shaft in Weathered Rock”, Journal of the Korean Geotechnical Society, Vol.27, No.6, pp.5-16.
10
Lee, M.H. (2004), “Present Status and Prospection of Domestic Pile Foundation”, Workshop for field engineer, Korean geotehcnical society, Vol.12, No.6, pp.79-86 (in Korean).
11
Mullins, G., Dapp, S. D., and Lai, P. (2000), “Pressure-grouting Drilled Shaft Tips in Sand”, In New technological and design developments in deep foundations, pp.1-17.
12
Mullins, G., Winters, D., and Dapp, S. (2006), “Predicting End Bearing Capacity of Post-grouted Drilled Shaft in Cohesionless Soils”, Journal of Geotechnical and Geoenvironmental Engineering, Vol.132, No.4, pp.478-487.
13
Pooranampillai, J., Elfass, S., Vanderpool, W., and Norris, G. (2009), “Large-Scale Laboratory Study on the Innovative Use of Compaction Grout for Drilled Shaft Tip Post Grouting”, In Contemporary Topics in Deep Foundations, pp.39-46.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 33
  • No :6
  • Pages :17-25
  • Received Date : 2016-12-21
  • Accepted Date : 2017-06-14
  • DOI :https://doi.org/10.7843/kgs.2017.33.6.17
Journal Informaiton Journal of the Korean Geotechnical Society Journal of the Korean Geotechnical Society
Archives
: Vol.23~28 (2007~2012)
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close