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Behavior of Slender Piles Subject to Free-Field Lateral Soil Movement
Authors:David J White  Mark J Thompson  Muhannad T Suleiman  Vernon R Schaefer
Affiliation:1Assistant Professor, Iowa State Univ. of Science and Technology, 476 Town Engineering, Ames, IA 50011-3232 (corresponding author). E-mail: djwhite@iastate.edu
2Staff Geotechnical Engineer, CH2M HILL, 1100 112th Ave., Suite 400, Bellevue, WA 98004. E-mail: mark.thompson@ch2m.com
3Lecturer, Iowa State Univ. of Science and Technology, 490 Town Engineering, Ames, IA 50011-3232. E-mail: suleiman@iastate.edu
4Professor, Iowa State Univ. of Science and Technology, 488 Town Engineering, Ames, IA 50011-3232. E-mail: vern@iastate.edu
Abstract:Soil movements associated with slope instability induce shear forces and bending moments in stabilizing piles that vary with the buildup of passive pile resistance. For such free-field lateral soil movements, stress development along the pile element is a function of the relative displacement between the soil and the pile. To investigate the effects of relative soil-pile displacement on pile response, large-scale load tests were performed on relatively slender, drilled, composite pile elements (cementitious grout with centered steel reinforcing bar). The piles were installed through a shear box into stable soil and then loaded by lateral translation of the shear box. The load tests included two pile diameters (nominal 115 and 178?mm) and three cohesive soil types (loess, glacial till, and weathered shale). Instrumentation indicated the relative soil-pile displacements and the pile response to the loads that developed along the piles. Using the experimental results, an analysis approach was evaluated using soil p-y curves derived from laboratory undrained shear strength tests. The test piles and analyses helped characterize behavioral stages of the composite pile elements at loads up to pile section failure and also provided a unique dataset to evaluate the lateral response analysis method for its applicability to slender piles.
Keywords:Pile load tests  Slope stability  Interactions  
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