Hyperbolic P-Y Model from Lateral Load Tests in Loess Soils

Another paper featured in the December 2011 issue of the DFI Journal was authored by Steve and Dan, along with Dr. Bob Parsons at the University of Kansas

Dapp, S.D., Brown, D.A., and Parsons, R.L. (2011). “Hyperbolic P-Y Model for Static and Cyclic Lateral Loading Derived from Full-Scale Lateral Load Tesing in Cemented Loess Soils”, DFI Journal Volume 5, Number 2, December 2011, Deep Foundations Institute, pp35-43.

The paper describes a program of lateral load tests on six drilled shafts installed in a loess deposit at a site in Wyandotte County, Kansas.  The lateral load test data, along with site characterization data that included CPT data, were used to develop a hyperbolic model to generate p-y curves for use in lateral load analyses in cemented soils.  The model should be applicable to many “c-phi” soils (soils with both a cohesion intercept and a friction angle, such as cemented soils).  Degradation of the static soil model to account for cyclic loading effects is included in the new model.

This paper was originally published in the DFI Journal, Vol. 5 No. 2, December 2011, the bi-annual Journal of the Deep Foundations Institute.  DFI is an international technical association of firms and individuals involved in the deep foundations and related industry. The DFI Journal is provided to DFI members at no cost electronically or can be purchased in print at www.dfi.org.

This paper is one of several papers and articles published form a series of research projects by KU and the Kansas DOT.  Some of the previous work can be found at these links:

Characterization of Loess for Deep Foundations (1/26/10)

Pierson, M., Parsons, R.L., Han, J., Brown, D.A. and Thompson, W.R. (2008). "Capacity of Laterally Loaded Shafts Constructed Behind the Face of a Mechanically Stabilized Earth Block Wall", Report for the Kansas Department of Transportation

Lateral load tests of drilled shafts behind an MSE wall – research with KDOT and KU (12/6/07)