Liquefaction Analysis of Large Diameter Long Pile Foundation in Medium Dense Sand under Earthquake Based on Finite Difference Method

Abstract

Liquefaction properties of large diameter long pile in medium dense sand under earthquake was investigated based on finite difference method. Dynamic property of foundation soil was modeled with equivalent linear model, three peak acceleration of 0.2g, 0.15g and 0.1g was studied. Numerical calculation results show that: peak acceleration affects large pore pressure zone and maximum pore pressure, when peak acceleration increase from 0.1g to 0.2g, large pore pressure zone moved from middle to bottom of pile, maximum pore pressure raised from 45 kPa to 350 kPa; liquefaction zone of foundation has a heart shape, and expanded with increase of peak acceleration, peak acceleration increase from 0.1g to 0.2g, depth of liquefaction zone bottom increase from 27% to 41% pile length, width of liquefaction zone increase from 34% to 41% pile length, peak acceleration reached to 0.2g, liquefaction zone extended to ground surface.