Stone columns for remediating liquefaction prone sand

摘要

This paper discusses the issues associated with using four (4) foot diameter stone columns at the toe of an earthen dam to remediate liquefaction-prone sand in the foundation soils for a major dam near Charleston, South Carolina. The authors, along with colleagues from their respective organizations, conducted a comprehensive field test of the feasibility of installing stone columns from the existing ground surface at the toe of the dam down through the questionable sand layer. This test provided data to assess productivity, cost, soil improvement as measured with "Before" and "After" SPT and CPT tests.