Soil–Pile Response to Blast-Induced Lateral Spreading. I: Field Test
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Volume 132, Issue 2
Abstract
Two full-scale experiments using controlled blasting were conducted in the Port of Tokachi on Hokkaido Island, Japan, to assess the behavior of a single pile, a four-pile group, and a nine-pile group subjected to lateral spreading. The test piles were extensively instrumented with strain gauges to measure the distribution of bending moment during lateral spreading which allowed the backcalculation of the loading conditions, as well as the assessment of damage and performance of the piles. Based on the test results, it was concluded that using controlled blasting successfully liquefied the soil, and subsequently induced lateral spreading in the 4–6% surface slope test beds. The free-field soil displacements in the vicinity of the test piles were over 40 cm for both tests. When compared with the results from the single pile case, the effect of pile head restraint from the pile cap improved overall pile performance by decreasing the displacement of the pile groups and lowering the maximum moments in individual piles within each group. Finally, backcalculated soil reactions indicated that the liquefied soil layer imparted insignificant force to the piles. In the companion to this paper (Part II), an assessment of the potential of using the analysis method for single piles and pile groups subjected to lateral spreading is presented.
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Acknowledgments
This research was sponsored by the PEER Lifelines Program with support from Caltrans, Pacific Gas & Electric and the California Energy Commission under Contract No. UNSPECIFIED65A0058, as well as by the Pacific Earthquake Engineering Research Center under NSF Contract No. NSFEEC-9701568.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 132 • Issue 2 • February 2006
Pages: 152 - 162
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© ASCE.
History
Received: Jul 28, 2003
Accepted: Jun 15, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
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