Akademik Veri Yönetim Sistemi
43rd Symposium on Engineering Geology and Geotechnical Engineering 2011: Water, Soils and Sustainability in the Intermountain West, EGGE 2011, Las Vegas, NV, Amerika Birleşik Devletleri, 23 - 25 Mart 2011, ss.476-484
The most common concerns due to the seismic load in saturated sandy soil are the excess pore water pressure and the settlement. Without respect to the initial, partial or complete liquefaction, the soil permeability is one of the major factors affecting the pore water pressure generation and dissipation during and after the earthquake. Several research attempts have investigated the effect of permeability on the liquefaction potential, using the centrifuge tests and laminar soil box. These studies have been conducted based on specific assumptions or models. This research focuses on the potential liquefaction hazard for saturated sandy soil under a shallow foundation. A serious of anisotropic cyclic triaxial tests associated with digital constant pressure permeability test is applied here for three different graded sandy materials in order to determine the excess pore water pressure under cyclic loading. The anisotropic cyclic loading is conducted in three different cyclic stress ratios under three different confining pressures (to reproduce depths of 10ft, 20ft and 30ft) and two relative densities (Dr = 50% and 90%). Additionally, a constant pressure permeability device is attached to the system; the permeability of the soil specimen had been measured before the cyclic test. The variation of the excess pore water pressure and the effective stress during the cyclic test is monitored for the determination of liquefaction potential. The relation between the permeability and degradation of the effective stress/pore pressure ratio is evaluated for the prediction of liquefaction.