Skip to main content
eScholarship
Open Access Publications from the University of California

Neutral plane solution for liquefaction-induced down-drag on vertical piles

  • Author(s): Boulanger, RW
  • Brandenberg, SJ
  • et al.
Abstract

Down-drag loads on pile foundations can be an important design consideration when earthquake-induced liquefaction is expected to cause ground settlements. A modified neutral plane solution for liquefaction-induced down-drag on vertical piles is described that accounts for the variation in excess pore pressures and ground settlements over time as a liquefied layer reconsolidates, the dependence of sand compressibility on excess pore pressure ratio, and the dependence of shaft skin friction on the excess pore pressure ratio. A worked example illustrates the role of various parameters on peak pile loads and settlements. The modified solution predicts substantially smaller pile settlements than obtained from a traditional neutral plane solution for end-of-consolidation conditions. Recommendations for design practice are presented.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View