Eighth International Conference on Case Histories in Geotechnical Engineering
Behavior of Rock-Socketed Drilled Shaft under Uni-Axial Loading—A Parametric Study
Publication: Geo-Congress 2019: Foundations (GSP 307)
ABSTRACT
Use of rock-socketed drilled shaft has been popular due to relative advantage in modern highway application. No interaction between drilled shaft and rock is considered in current design guideline due to the complexity and limited data availability. This results in likely conservative design for rock-socketed drilled shaft. The interaction of drilled shaft is significantly influenced by the characteristics of rock. Numerical modeling has been most cost effective to analyze drilled shaft in context of different geometries and parametric study. Numerical modeling was performed to determine behavior of the rock-socket. The numerical results were calibrated in PLAXIS2D from a full-cycle uni-axial O-cell load test. The load test was performed for drilled shaft with rock-socket which was located under a bridge pier. A Hoek-Brown failure criterion, able to consider non-linear strength behavior of rock, was selected for constitutive model of rock. The calibrated model has been selected for parametric study. The factors of parametric study for rock properties include unconfined compressive strength, geological strength index, and disturbance factor. The results of that study will reduce the cost of the drilled shaft construction.
Get full access to this article
View all available purchase options and get full access to this chapter.
ACKNOWLEDGEMENT
The field O-cell load test was funded by the New Jersey Department of Transportation (NJDOT) and Federal Highway Administration (FHWA). The contents of this paper reflect the opinion of the authors, which do not necessarily reflect the official view or policies of the NJDOT and FHWA.
REFERENCES
ASTM (American Society for Testing and Materials) D1143. (2013) Standard Test Methods for Deep Foundations Under Static Axial Compressive Load, ASTM International, West Conshohocken, PA.
Benz, T., Schwab, R., Vermeer, P.A. Kauther, R.A. (2007). “A hoek-brown criterion with intrinsic material strength factorization.” Int. J. of Rock Mechanics and Mining Sci., 45(2), pp. 210–222.
Bui, T.Y., Li, Y., Tan, S.A., and Leung, C.F. (2005). “Back analysis of O-cell pile load test using FEM.” Proc. of 16th ICSMGE, Osaka, Japan, pp. 1959–1962.
Duncan, J.M., Chang, C.Y. (1970). “Nonlinear analysis of stress and strain in soil.” J. of the Soil Mech. and Found. Div., (ASCE), Vol. 96, pp.1629–1653.
FHWA (2010). “Geotechnical Engineering Circulation No. 10: Drilled Shafts: Construction Procedures and LRFD design Methods.” Report No. FHWA-NHI-10-016, Department of Transportation.
Gibson, G. L. and Devenny, D. W. (1973). “Concrete to bedrock bond testing by jacking from bottom of a borehole.” Canadian Geotechnical Journal, Vol. 10 (2), pp. 304–306.
Hoek, E. (2006). Practical Rock Engineering. E-book.
Hoek, E., Carranza-Torres, C., Corkum, B. (2002). “Hoek-Brown failure criterion- 2002 Edition.” Proc. of NARMS-TAC Conference, Toronto, Vol. 1, pp. 267–273.
Horvath, R.G., Kenney, T.C., and Kozicki, P. (1983). “Methods of Improving the Performance of Drilled Piers in Weak Rock.” Canadian Geotechnical Journal, Vol. 20, pp. 758–772.
McVay, M., Huang, S., and Casper, R. (1994). “Numerical Simulation of Drilled Shafts for Osterberg, Pullout, and Axial Compression Loading in Florida Limestone.” Final Report. Department of Civil Engineering, University of Florida, Gainesville, Florida.
NJDOT (2017). “Report on Drilled Shaft Load Testing (Osterberg Method).” Pier 4 South-Route 280 over Broad Street Ramp E, Newark, NJ (Submitted by Loadtest USA, Inc.).
O’Neill, M.W., Brown, D.A., Townsend, F.C., and Abar, N. (1997). “Innovative Load Testing of Deep Foundations.” Transportation Research Record 1569, Transportation Research Board, Washington, DC, pp. 17–25.
Osterberg, J.O. (1989). “New Device for load testing driven piles and drilled shafts separates friction and end bearing.” Proc. Int. Con. on Piling and Deep Fnd., London, pp. 421–426.
Osterberg, J.O. (1994). “Recent Advances in Load Testing Driven Piles and Drilled Shafts Using the Osterberg Load Cell Method.” Geotechnical Division, Illinois Section, ASCE, pp. 79
Paikowsky, S.G. (2004). “Load and Resistance Factor Design (LRFD) for Deep Foundations.” NCHRP Report 507, Transportation Research Board, Washington, DC, pp. 126.
PLAXIS (2010). Material Model Manual. E-manual.
PLAXIS2D (2015). PLAXIS Computer Program, Version 2015.2.19890.13737.
Shi, L. (2003). “The Effect of Load Direction on Axial Capacity of Deep Foundations.” Ph.D. dissertation, Auburn University, Auburn, AL.
Information & Authors
Information
Published In
Geo-Congress 2019: Foundations (GSP 307)
Pages: 213 - 222
Editors: Christopher L. Meehan, Ph.D., University of Delaware, Sanjeev Kumar, Ph.D., Southern Illinois University Carbondale, Miguel A. Pando, Ph.D., University of North Carolina Charlotte, and Joseph T. Coe, Ph.D., Temple University
ISBN (Online): 978-0-7844-8209-4
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: Mar 21, 2019
ASCE Technical Topics:
- Design (by type)
- Drilled pier foundations
- Drilled shafts
- Engineering fundamentals
- Foundations
- Geology
- Geotechnical engineering
- Load factors
- Load tests
- Material mechanics
- Material properties
- Materials engineering
- Mathematics
- Models (by type)
- Numerical models
- Parameters (statistics)
- Rocks
- Shafts
- Statistics
- Structural design
- Tests (by type)
- Tunnels
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.