A study of some impacts of structure on the mechanical behaviour of geomaterials

Abstract

The study firstly investigates the influence of interparticle attractions by creating artificial bonding through soil particles under controlled pressure and temperature conditions using sucrose (C₁₂H₂₂O₁₁).  Therefore, a temperature controlled triaxial apparatus has been developed that includes instrumentation capable of measuring the stiffness of a specimen at small strain levels during the triaxial loading. Triaxial testing on the specimens resulted in a sharp decrease followed by gradual increase in the deviatoric stress, stiffness, and a structure permitted area in stress space, as well as a sharp increase followed by a gradual decrease in corresponding pore pressure.  These successive drops and formations give a stick-slip nature to the fluctuations, which might be attributed mainly to the rate of loading, effective stress, pore fluid characteristics, crystal growth, compliance in the apparatus, and the initial fabric.  The main reason of this jamming might lie in the fact that the internal forces do not uniformly propagate through the specimen but are localized through force chains of strained grains.  It is interpreted that the process undergone by the sucrose-sand mixture may consist of the bonding of the sand particles.  Furthermore, the study also provides an additional data set to compare the mica-rotund sand mixtures with some of the sucrose-rotund sand mixes in the triaxial apparatus, which supports the view that the high compressibility of the mixes is likely to be a result of particle shape.

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