Evaluating the Seismic Performance of Deep Soil Mixing: The Role of Motion Intensity in Improved Soil Response in bahasa

Abstract

Liquefaction during earthquake shaking can reduce the shear strength and bearing capacity of soils supporting the backfill system. Deep Soil Mixing (DSM) is a ground improvement method used to mitigate liquefaction, and numerous studies have demonstrated its effectiveness in reducing shear stress and excess pore water pressure generation under seismic loading. However, most studies have not considered the effect of seismic motion intensity on improved ground performance. This study evaluates the influence of seismic loading intensity on the seismic response of DSM-improved soil using two-dimensional (2D) finite element analysis with a dynamic-with-consolidation approach that accounts for pore pressure dissipation during seismic loading. A parametric study was conducted to assess the effects of different DSM configurations, defined by soil improvement ratios and seismic motion intensity, on excess pore pressure reduction. The results indicate that the effectiveness of DSM in reducing liquefaction potential decreases under high-intensity motion; however, additional confining pressure from reinforced backfill provides further resistance against liquefaction. Moreover, increasing motion intensity leads to greater deformation and higher pore pressure ratio (Ru), while higher soil improvement ratios result in greater reduction of liquefaction potential.