Abstract
During a self-boring pressuremeter test (SBPMT), a cylindrical cavity is expanded from finite radius. With this view, a method for estimating volumetric strains in expanding plastic zone based on finite strain analysis is developed to solve the problems related to expansion of cylindrical cavity from a finite radius in sands. Using finite strains, average value of volumetric strains in the plastic zone is calculated at various values of circumferential strains (e θθ ) ranging up to about 30%, when the value of angle friction (Φ) is varying between 25 and 45 degrees and the value of rigidity index (I r ) is varying between 5 and 1000. The dimensional cavity expansion factor (F q ) is calculated using cavity expansion theory to develop Fq' versus e θθ curves at various values of Φ and I τ . In the companion paper, Gupta (2005), this method has been applied to analyze the SBPM tests performed in sands for determining Φ), I r , and modulus of deformation (E) at different stress levels.
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