PARAMETRIC STUDY OF PILE IN LIQUEFIABLE STRATA

Abstract

The phenomenon of liquefaction of soil has been observed since many years but it being the cause of damage of the superstructure due to earthquake came into picture after the Niigata (1964) and Alaska (1964) earthquakes. As Delhi comes in the region of zone IV, there becomes the need for the identification of liquefaction potential. In present project, an attempt is made to study the performance of the piles in non-liquefied zone and liquefied zone of Delhi Metro Viaduct in which the area from Jamia to Okhla Vihar comprised of liquefied zone and Kalindi Kunj to Jasola comprised of non-liquefied zone. With the help of collected borehole log data i.e. SPT data and peak ground acceleration likely to occur at the site, an attempt was made to assess in detail the liquefaction potential of foundation strata by simplified approach proposed by Seed and Idriss (1983-1985). A slow increase in the depth of the liquefaction strata in 2m interval is studied and depth at which the pile can sustain the liquefaction without much structural damage is estimated. With the consideration of liquefiable strata in the said portion, the variation in performance of the piles in terms of time period, fixity, shear force, bending moment is analyse.