EFFECT OF LIQUEFIED STABILIZED SOIL AS BACKFILLING MATERIAL ON THE BUILDING UNDER SEISMIC CONDITION
Keywords:
Liquefied stabilized soil, Fiber material, FEM analysis, EarthquakeAbstract
In Japan, excavated soils generated from construction sites in urban areas are being disposed to
landfill as industrial waste. With limited urban land in big cities, the landfill sites will be more and more scarce
and overload state in the next few years. Therefore, the effective use of soil generated from construction is an
urgent issue. Liquefied Stabilized Soil (LSS) is one of the effective methods of using excavated soil with
construction works, has become popular in Japan. Numerous previous studies have shown the many advantages
of LSS. However, no studies have evaluated the effect of LSS on the surrounding environment when an
earthquake occurs. In this study, the effect of backfilling material on the building and ground under the
earthquake is analyzed by using the finite element method (FEM). A three-dimensional model of the ground
and a 10-story building with one basement was simulated in ABAQUS software. Three case studies with three
types of backfilling material (backfilling soil, LSS, and LSS with fiber) were analyzed and compared. Based
on the analysis results, it is shown that using LSS as a backfilling material can reduce the lateral displacement
and inter-story drift of building slightly when an earthquake occurs. Besides, the acceleration and velocity of
the ground around the building decreased, with the largest reduction rates up to 49.4 % and 24.5 %, respectively.