NONPLASTİK SİLT KUM KARIŞIMLARINDA BOOTSTRAP YÖNTEMİ İLE BOŞLUK SUYU BASINCI OLUŞUMUNUN DEĞERLENDİRİLMESİ

Abstract

The aim of this paper is to evaluate the applicability of the available three different models to predict excess pore water pressure generation in non-plastic silty sand mixtures during cyclic loading. Cyclic triaxial tests were performed to investigate the effect of silt content on the pore pressure generation in sand. These tests were carried to 200 cycles or to onset of initial liquefaction, whichever occurred first. Several stress-controlled cyclic triaxial tests were performed to measure excess pore water pressure generation at different levels of cyclic stress ratios for the specimens prepared at six different silt contents (FC=0% to 100%). The specimens were tested under 100 kPa confining pressures at two relative densities of 25% and 50%. Results of these tests were used to investigate the behavior of silty sands under undrained cyclic triaxial testing conditions. Seed et al. [3], Booker et al. [2] and Polito et al. [8] pore water pressure generation models based on test results are also presented in this paper. An attempt to estimate the pore pressure model coefficient a as a function of silt content, relative density, cyclic stress ratio was made. Keywords: Pore water pressure, non-plastic silt-sand mixtures, cyclic triaxial tests, bootstrap method