Browse > Article
http://dx.doi.org/10.7843/kgs.2007.23.8.107

Resistance Factors for Drilled Shafts Embedded in Weathered Rock  

Yoon, Hong-Jun (Korea Highway Corporation)
Jung, Sung-Jun (Dept. of Civil, Urban & Geosystem Eng., Seoul National Univ.)
Kim, Myoung-Mo (Dept. of Civil, Urban & Geosystem Eng., Seoul National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.8, 2007 , pp. 107-116 More about this Journal
Abstract
Load and Resistance Factor Design (LRFD) method is being used increasingly in geotechnical design practice worldwide, and is expected to completely replace the current Allowable Stress Design (ASD) method in the near future. LRFD has advantages over ASD in that it allows the design of superstructures and substructures at a consistent reliable level by quantification of failure probability based on reliability analysis. At present, resistance factors for cast-in-place piles embedded in rocks are determined by AASHTO only for the intact rock conditions. In Korea, however, most of the bedrocks in which piles are embedded are heavily weathered. Thus, this study will try to determine the resistance factors of heavily weathered rocks (so-called intermediate goo-materials). To this aim, reliability analysis was carried out to evaluate the resistance factors of cast-in-place piles embedded in intermediate geo-materials in Korea. Pile load test data of 21 cast-in-place piles of 4 construction sites were used for the analysis. Depending on the method which calculates the pile capacities, the resulting resistance factors ranged between 0.1 and 0.6.
Keywords
Code calibration; Load and resistance factor design; Reliability analysis; Rock socketed pile;
Citations & Related Records
연도 인용수 순위
  • Reference
1 American Association of State Highway and Transportation Officials, Washington, D.C, 2004 AASHTO LRFD Bridge Design Specification. 3rd edition
2 National Cooperative Highway Research Program REPORT 507 (2004), Load and Resistance Factor Design (LRFD) for Deep Foundations, TRB, Washington, D.C
3 O'Neill, M., Townsend, F., Hassan, K., Buller, A., and Chang, P. (1996), 'Load Transfer for Drilled Shafts in Intermediate Geomaterial', FHWA-RD-95-172, FHWA
4 Tang, W. Woodford, D., and Pelletier, J. (1990), 'Performance Reliability of Offshore Piles', Proceedings of the 22nd Annual Offshore Technology Conference. May 7-10, Houston, IX, Paper No. OTC 6379, Offshore Technology Conference, Richardson, TX, Vol.3, pp.299-308
5 Carter, J. P., and Kulhawy, F. H. (1987), 'Analysis and design of foundations socketed into rock', Research Report 1493-4, Geotechnical Engineering Group, Cornell University, Ithaca, New York
6 Carter, J. P. and Kulhawy, F. H. (1988), 'Analysis and design of drilled shaft foundations socketed into rock', Report EL-5918, Electric Power Research Institute, Palo Alto, California
7 Zhang, L. and Einstein, H. H. (1988), 'End bearing capacity of drilled shafts in rock', Journal of Geotechnical and Geoenvironmental Engineering, Vol.124, No.7, pp.574-584   DOI   ScienceOn
8 Wu, T., Tang, W., Sangrey, D., and Baecher, G. (1989), 'Reliability of Offshore Foundations-State of the Art', Journal of Geotechnical Engineering, Vol.115, No.2, pp.157-178   DOI   ScienceOn
9 Horvath, R. G. and Kenny, T. C. (1979), 'Shaft resistance of rock-socketed drilled piers', Drilled shaft design and construction in Florida, Department of Civil Engineering, University of Florida, Gainesville
10 Rowe, R. K. and Armitage, H. H. (1987), 'A design method for drilled piers in soft rock', Canadian Geotechnical Journal, Vol.24, pp.126-142   DOI   ScienceOn
11 Barker, R.R., J.M. Duncan, K.B. Rojiani, P.S.K. Ooi, C.K. Tan, and S.G. Kim (1991a), 'Manuals for the Design of Bridge Foundations', NCHRP Peport 343, Transportation Research Board, National Research Council, Washington, DC
12 Meyerhof, G. (1970), 'Safety Factors in Soil Mechanics', Canadian Geotechnical Journal, Vol.7, No.4, pp.349-555   DOI
13 권오성 (2004). '암반의 풍화도가 암반근입말뚝의 지지거동에 미치는영향', 서울대, 박사학위 논문
14 LCPC-SETRA (1985), 'Regles de justificaton des fondations sur pieux a partir des resultats des essais pressiometriques', Ministre de L'Urbanisme du logement et des Transports, Paris. (in French)