Behavior of Slender Piles Subject to Free-Field Lateral Soil Movement
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 134, Issue 4
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 ) 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 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.
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Acknowledgments
The Iowa Department of Transportation and the Iowa Highway Research Board sponsored this study under Contract No. UNSPECIFIEDTR-489. The writers are grateful for the sponsorship. They also acknowledge the following undergraduate students: Martinique Martineau, Matz Jungmann, Andy Floy, Jesse Clark, Christopher Milner, and Michael Richardson who helped with field tests.
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© 2008 ASCE.
History
Received: Dec 28, 2005
Accepted: Mar 28, 2007
Published online: Apr 1, 2008
Published in print: Apr 2008
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