Assessment of Liquefaction Potential Index for Approach Road of Padma Multipurpose Bridge

Abstract

Seismic soil liquefaction is evaluated for ongoing approach road project of Padma Multipurpose Bridge in terms of the factors of safety against liquefaction (FS) along the depths of soil profiles for different magnitude of earthquakes and peak ground acceleration by using standard penetration test (SPT) based on simplified empirical procedure. This liquefaction potential is evaluated in the approach road using the borehole records from standard penetration tests. Liquefaction potential index (LPI) is evaluated at borehole locations from the obtained factors of safety (FS) to predict the potential of liquefaction to cause damage at the surface level at the site of interest. For each location, soil liquefaction potential is presented in the form of contour plot of matrix of LPI values by using MATLAB numerical tool. As the soils at the site are predominantly alluvial deposits, the vulnerability of liquefaction is observed to be very high at many locations.