Browse > Article
http://dx.doi.org/10.7843/kgs.2008.24.11.61

Load-Settlement Behavior of Rock-socketed Drilled Shafts by Bi-directional Pile Load Test  

Seol, Hoon-Il (Dept. of Civil and Environmental Engrg., Yonsei Univ.)
Jeong, Sang-Seom (Dept. of Civil and Environmental Engrg., Yonsei Univ.)
Han, Keun-Taek (Civil & Environmental Division, Posco E&C Cop.)
Kim, Jae-Young (Dept. of Civil and Environmental Engrg., Yonsei Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.24, no.11, 2008 , pp. 61-70 More about this Journal
Abstract
Load settlement behaviors and load transfer characteristics of rock-socketed pile subjected bi-directional load at pile tip were investigated using bi-directional pile load tests (BD PLT) performed on ten large-diameter drilled shafts at four sites. Based on test results, additional pile-toe displacement ($w_{bs}$) by coupled soil resistance was analyzed, and thus equivalent top loaded load-settlement curve of pile subjected bi-directional load was proposed by taking into account the coupled soil resistance. Through comparisons with field case studies, it is found that for test piles there exists effect of coupled soil resistance, which is represented by wbs, and thus an equivalent curve obtained by existing uncoupled methods can overestimate bearing capacity of piles by BD PLT. On the other hand, the analysis by the proposed method with soil coupling effect has a considerably larger settlement when compared with the results by uncoupled load transfer method and estimates reasonable load-settlement behaviors of test piles. In case of pile socketed in high strength rocks, however, effects of coupled soil resistance can be neglected.
Keywords
Bi-directional pile load test; Coupled soil resistance; Drilled shafts; Load settlement behavior; Load transfer analysis;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 권오성, 최용규, 권오균, 김명모 (2006), "양방향 재하시험을 이 용한 말뚝의 하중-변위곡선 추정방법", 한국지반공학회 논문집, Vol.22, No.4, pp.11-19   과학기술학회마을
2 백경지엔씨 (2007a), 부산-김해간 경량전철 민간투자사업 건설공 사 3공구: 현장타설말뚝 재하시험 최종보고서
3 최용규, 김원철, 임태경, 정창규, 박봉근 (2002), "오스터버어그 셀을 이용한 말뚝재하시험방법 및 적용사례 연구", 한국지반공 학회 기초기술 학술발표회논문집
4 Drumm, E.C., Huang, B., He, W. and Zuo, G. (2005), "Back- Calculation of Rock Socket Friction for Concrete Shafts in Karst", Proceedings of 11th Int. Conf. of the Association for Computer Methods and Advances in Geomechanics, Turin Italy, June, pp. 437-444
5 Fellenius, B.H., Altaee, A., Kulesza, R., and Hayes, J. (1999), "O-cell Testing and FE Analysis of 28-m-deep Barrette in Manila, Philippines", Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol.125, No.7, pp.566-575   DOI
6 Osterberg, J.O. (1998), "The Osterberg load test method for bored and driven piles the first ten years", Proceedings of the 7th International Conference on Piling and Deep Foundations, Vienna, pp. 1.28.1-1.28.11
7 Osterberg, J.O. (2001), "Load testing high capacity piles what have we learned?" Proceedings of the 5th international conference on deep foundation practice, Singapore
8 Seol, H.I., Jeong, S.S., Cho, S.H. (2008b), "Analytical Method for Load Transfer Characteristic of Rock-Socketed Drilled Shafts", J. of Geotechnical and Geoenvironmental Engineering, ASCE, Accept
9 Poulos, H.G., and Davis, E.H. (1968), "The settlement behavior of single axially loaded incompressible piles and piers", Geotechnique, Vol.18, pp.351-371   DOI
10 설훈일, 정상섬 (2007), "Shaft Resistance Characteristics of Rock- Socketed Drilled Shafts based on Filed Pile Loading Tests", 한국 지반공학회 논문집(영어논문), Vol.23, No.9, pp.51-63   과학기술학회마을
11 정창규 (2004), 선단유압재하시험법의 현장적용성에 관한 연구, 경성대학교 박사학위 논문
12 Schmertmann, J.H., and Hayes, J.A. (1997), "The Osterberg cell and bored pile testing - a symbiosis", In: Proceedings of 3rd international geotechnical engineering conference, Cairo
13 한국지반공학회 (2003), 구조물 기초설계기준
14 ABAQUS (2004), "Theory manual, version 6.5", Hibbit, Karlsson & Sorensen, Pawtucket R.I
15 Castelli, F., Maugeri, M., and Motta, E. (1992), "Analisi non lineare delcedimento di un Palo Singolo", Rivista Italiana di Geotechnica, Vol.26(2), pp.115-135
16 Seol, H.I., Jeong, S.S., Kim, Y.M. (2008a), "Load Transfer Analysis of Rock-Socketed Drilled Shafts by Coupled Soil Resistance", Computers and Geotechnics, Elsevier, DOI:10.1016/j.compgeo.2008. 08.012
17 조성한 (1997), 풍화암에 근입된 현장타설말뚝의 하중전이에 관 한 연구, 연세대학교 박사학위 논문
18 Seol, H.I, Jeong, S.S., Cho, C.H., and You, K.H., (2008c), "Shear Load Transfer for Rock-Socketed Drilled Shafts based on Borehole Roughness and Geological Strength Index (GSI)", International Journal of Rock Mechanics and Mining Sciences, Vol.45, pp.848-861   DOI   ScienceOn
19 한근택 (2008), 양방향 선단재하시험에 의한 현장타설말뚝의 하 중-침하 거동 분석, 연세대학교 석사학위 논문
20 Kishida, H., Tsubakihara, Y., and Ogura, T. (1992), "Pile Loading Tests at Osaka Amenity Park Project", preprint by Mitsubishi Co
21 OADTEST, Inc. (2000), "Construction of The Equivalent Top-Loaded Load-Settlement Curve from the Results of an O-cell Test", Loadtest appendix to reports
22 Ogura, T., Sumi, M., Kishida, H., and Yoshifuka, T. (1996), "Application of the Pile Toe Test to Cast-in-place and Precast Piles", translated by MandanB. Karkee, Foundation Drilling Magazine, ADSC, December1996/January 1997, pp.23-28
23 신승현, 이양구, 김주철, 김정환, 이현근 (2005), "인천대교 대구 경 현장타설말뚝 Osterberg-cell 시험 적용 사례", 대한토목학회 학술대회 논문집. pp.3921-3924
24 Coyle, H.M., and Reese, L.C. (1966), "Load transfer for axially loaded piles in clay", J Soil Mech. and Found. Div., ASCE, Vol.92(2), pp.1-26
25 Ogura, T., Sumi, M., Kishida, H., and Yoshifuka, T. (1996), "Application of the Pile Toe Test to Cast-in-place and Precast Piles", translated by MandanB. Karkee, Foundation Drilling Magazine, ADSC, December1996/January 1997, pp.23-28
26 백경지엔씨 (2007b), 부산 서면 센트럴스타 신축공사: 현장타설 말뚝 재하시험 보고서