FINITE STRAIN ANALYSIS FOR SELF-BORING PRESSUREMETER TESTS IN SAND

概要

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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 (ε_<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 F"_q versus ε_<θθ> curves at various values of φ and I_r. 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.
社団法人地盤工学会の論文
2005-10-15