Abstract
The use of lubricated free end platens in triaxial testing to promote uniform deformation of the test specimen has a history dating back to the work of D.W. Taylor and others in the 1950s and 1960s, as documented by Rowe and Barden. The performance of critical state triaxial testing programs has become standard industry practice for defining the critical state line (CSL) for silts, sands, and mine tailings to support static liquefaction assessments using a critical state soil mechanics framework. In current practice, the use of free ends is most often combined with the use of a traditional specimen height-to-diameter ratio of 2:1. This paper investigates the effect of the original recommendation of Rowe and Barden, for the use of a 1:1 height-to-diameter ratio in combination with free ends, on the determination of the CSL and other constitutive model parameters for a glaciofluvial feldspathic quartz sand.