All Issue

2018 Vol.34, Issue 5

Research Article

Analysis of Bearing Capacity and Safety Factor of Dynamic Load Test of Prebored and Precast Steel Pile

현장재하시험을 통한 강관 매입말뚝의 지지력 안전율 제안

Jong-Jeon Park1
,
Sang-Seom Jeong2*
,
Jeong-Sik Park1
박 종전1
,
정 상섬2*
,
박 정식1
1Member, Dept. of Civil and Environment Engrg., Yonsei Univ.
2Member, Dept. of Civil and Environment Engrg., Yonsei Univ.
1정회원, 연세대학교 토목환경공학과
2정회원, 연세대학교 토목환경공학과
* 교신저자* Corresponding Author
31 May 2018. pp. 5-17
PDF XML Citation
Abstract

In this study, the static and dynamic load tests were carried out to propose the safety factor of steel prebored and precast piles in weathered rocks. The axial load tests have been conducted on test piles with nominal diameters of 0.508 and 0.457 m. The piles were subject to static loading tests (14 times) and dynamic loading tests (EOID 14times, Restrike 14times). The dynamic loading tests were first executed after the casting of test piles (① initial EOID test). ②In the succeding 28 days from completion of construction, static load tests were performed and ③final restrike tests were carried out after 15 days from the static test. As a result, the bearing capacity based on Davisson method was 15% higher than that of the restrike tests. The bearing capacity of the static load tests were larger than that of the dynamic tests. By comparing the safety factor through various loading tests, the safety factor of dynamic loading tests were suggested to be lowered to 1.75 from the conventional 2.0.

Keywords
Steel pile
Prebored and precast pile
Dynamic load test
Static load test
Safety factor
Bearing capacity

본 연구에서는 풍화암에 근입된 강관 매입말뚝의 안전율 제안을 위하여 정재하시험과 동재하시험을 수행하였다. 현장재하시험은 직경이 0.508, 0.457m 인 시험말뚝을 제작하여 정재하시험(14회)과 동재하시험(EOID 14회, Restrike 14회)을 실시하였다. 이때, 재하시험은 시험말뚝 시공완료 후 ①초기동재하시험(EOID)을 수행하였으며, ②시공완료 28일 후 정재하시험을 시행하였으며, ③정재하시험 완료 후 15일 후에 재항타동재하시험(Restrike)을 실시하였다. 본 연구 결과 Davisson 판정법의 동재하시험을 이용한 지지력 산정 결과 정재하시험 대비 재항타동재하시험은 약 15% 낮게 나타났다. 정재하시험과 동재하시험의 지지력 분석을 통하여 안전율을 비교하였고, 최종적으로 동재하시험 안전율을 기존 2.0에서 1.75로 수정･제안하였다.

References
1
Garland Likins. and Frank Rausche. (2004), CORRELATION OF CAPWAP WITH STATIC LOAD TESTS.
2
Goble, G. G., Rausche, F., and Likins, G. (1980), The analysis of pile driving-A state-of-the art. Proc. of the 1st Int’l Conf. on Application of Stresswave Theory to Piles. Balkema, Stockholm Sweden.
3
Linkis, G. E., Rausche, F., Thendean, G., and Svinkin, M. (1996), CAPWAP Correlation Studies. Proc. of the 5th Int’l Conf. on the Application of Stresswave Theory to Piles. University of Florida, Orlando Florida USA.
4
Park, J. B. (2017), “A Comparative Study on the Bearing Capacity of Dynamic Load Test and Static Load Test of PHC Bored Pile”, Journal of the Korean Geo-Environmental Society, Vol.18, No.9, pp.19-31.
5
Kim, J. H. and Yea, G. G. (2013), “Case Study of Comparative Analysis between Static and Dynamic Loading Test of PHC Pile”, Journal of the Korean Geo-Environmental Society, Vol.14, No.11, pp.13-23.
6
American Society for Testing and Materials (1994), Standard test methods for deep foundations under static axial compressive load (ASTM D1143), ASTM, West Conshohocken, pp.60-68 (in Korean).
7
Park, J. B. (2004), “Estimation of Bearing Capacity of SIP Pile Installed by Improved Criteria”, Journal of the Korean Geo-Environmental Society, Vol.5, No.3, pp.5-15.
8
Park, J. B. (2004), “Strength and Friction Behavior Cement paste poured in the Bored Pile”, Journal of the Korean Geo-Environmental Society, Vol.5, No.3, pp.31-39.
9
Park, Y. H. (2004), A Study of Design and Construction of SIP Method. Korea Expressway Corportation Research Institute, pp. 138-152, pp.347-365.
10
Lee, C. H., Lee, W. J., Jeong, H. J., and Han, S. I. (2005), “Evaluation of Point Bearing Capacity Using Field Model Pile Test”, Journal of the Korean Geo-Environmental Society, Vol.6, No.3, pp.47-54.
11
Hong, W. P., Lee, J. H., and Chai, S. G. (2008), “Bearing Capacity of SDA Augered Piles in Various Grounds Depending on Water- Cement Ratio of Cement Milk”, Journal of the Korean Geo- Environmental Society, Vol.24, No.5, pp.37-54.
12
Hong, W. P. and Chai, S. G. (2007), “Estimation of End Bearing Capacity of SDA Augered Piles on Various Hearing Stratums”, Journal of the Korean Geotechnical Society, Vol.23, No.5, pp. 111-129.
13
Hong, W. P. and Chai, S. G. (2007), “Estimation of Frictional Capacity of SDA Augered Piles in Various Ground”, Journal of the Korean Geotechnical Society, Vol.27, No.4, pp.279-292.
14
Shin, B. W. and Lee, J. D. (2000), “Field Model Test on Uplift Capacity of Bored Pile in Weathered Granite Soil”, Journal of the Korean Society of Civil Engineers, Vol.20, No.5, pp.441-451.
15
Jung, H. S., Lim, H. S., and Kim, J. S. (2003), “Suggestion of Evaluation Formula for Skin Resistance of SIP”, Journal of the Korean Geotechnical Society, Vol.4, No.1, pp.59-66.
16
Cho, C. W., Kim, H. M., and Kim, W. K. (2004), “Bearing Capacity Evaluation of the Drilled Shaft Using Small Scale Model Test”, Journal of the Korean Geotechnical Society, Vol.20, No.5, pp. 117-126.
17
Hosseini, M. A. and Rayhani, M. (2017), Evolution of pile shaft capacity over time in marine soils, International Journal of Geo- Engineering, Vol.8, No.12.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 34
  • No :5
  • Pages :5-17
  • Received Date : 2017-12-29
  • Revised Date : 2018-04-06
  • Accepted Date : 2018-04-20
  • DOI :https://doi.org/10.7843/kgs.2018.34.5.5
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