Undrained Point Load-Point Displacement Response of Piles/Drilled Shafts in Clay and Sand

Abstract

The undrained load-settlement response of a pile or drilled shaft tip in saturated clay or sand can be assessed based on a simple Mohr circle model of the stress state at and below the pile/shaft tip coupled with established stress-strain formulation employed with a corresponding mobilized Schmertmann's strain triangle. Such analysis is presented and used to compare with tests from the literature for clay and from Statnamic results from Washington DOT tests on two drilled shafts after rate or velocity effects have been taken out but undrained load-deflection behavior ABSTRACT: The undrained load-settlement response of a pile or drilled shaft tip in saturated clay or sand can be assessed based on a simple Mohr circle model of the stress state at and below the pile/shaft tip coupled with established stress-strain formulation employed with a corresponding mobilized Schmertmann's strain triangle. Such analysis is presented and used to compare with tests from the literature for clay and from Statnamic results from Washington DOT tests on two drilled shafts after rate or velocity effects have been taken out but undrained load-deflection behavior