AN INNOVATIVE DOUBLE CELL TRIAXIAL SYSTEM FOR CONTINUOUS MEASUREMENT OF THE VOLUME CHANGE OF GASEOUS OR UNSATURATED MARINE SOILS AND TWO OTHER ADVANCED SOIL TESTING SYSTEMS

摘要

This paper introduces three advanced laboratory testing systems for measuring the stress-strain-strength behavior of soils. The three systems are: (a) a new Double Cell Triaxial System (DCTS) for continuous measurement of the volume change of a gaseous (unsaturated or saturated) soil specimen in triaxial testing (this system is developed by the author). (b) a Hollow Cylinder Apparatus (HCA) for measuring the behavior of a hollow soil specimen under conditions of pure shearing, plain strain, rotation of the middle principle stress, etc., and (c) a Truly Triaxial System (TTS) for measuring the behav or of a brick-shape soil specimen under independent control of the three principle stresses. Calibration results on the DCTS are presented and discussed.