FIELD BEHAVIOR OF EXCAVATION STABILIZED BY DEEP SOIL MIXING

This paper describes the performance of a tiedback excavation with a s oil mixed wall in Boston where underlying marine clay was stabilized b y deep soil mixing (DSM) and jet grouting. Lateral and vertical soil d isplacements, soil strains, and tieback loads are evaluated. The inter action between the retained soil and a reinforced concrete box culvert , supported on drilled shafts, is described. Piezometer measurements b ehind the wall are summarized. They show pore-water pressures in marin e clay substantially less than the hydrostatic pressures assumed in de sign.