تحلیل عددی تاثیر ستون سنگی برای کاهش خطر روانگرایی خاک در حین زلزله

During recent earthquakes, it was observed that liquefaction can cause severe damages to several countries' infrastructures including the buildings, bridges, road and railways in the form of significant settlement and the relevant shear failures of subgrade soil. Amongst the various rehabilitation methods of the soils tending to be liquefied, utilization of the stone column have encountered with more attention because of its beneficial characteristics from both technical and economical points of view. One of the major issues in this matter is their efficiency in liquefaction mitigation in the single and group forms. For this purpose the current study has dedicated to numerical investigation of the problem of stone column efficiency in dissipating the excess pore water pressure during the earthquake excitation, and The reliability of the numerical modeling is verified via a centrifuge test results of VELACS project. a three dimensional analysis is carried out using FLAC3D. Also, effects of various parameters such as stone column diameter, stone columns distances on the liquefaction resistance of NEVADA sand soil are investigated.