수치해석을 통한 DCM기둥으로 지지된 성토체의 토목섬유보강에 따른 효과 분석

Abstract

Among the various ground stabilizing techniques is pile supported embankment which bears the embankment fill on top of the soft ground by installing piles in the soft ground to transfer the load of fill to the direct supported layer using the soil arching phenomenon of embankment ground. However, there is relatively big differential settlement between the piles when using only piles to support the embankment fill, so Geosynthetic reinforced pile supported embankment (GRPS) is often used with Geosynthetic reinforcement in order to reduce differential settlement. This study uses PLAXIS 2D, a 2D finite element program, to analyze the soil arching phenomenon following the interval of different types of DCM (Deep Cement Mixing) columns, the improvement of load transfer effect to the DCM columns with the increase in Geosynthetic reinforcement, and the reduction effect of differential settlement between columns. As a result of finite element analysis, GRPS shows relative difference in the reduction effect of differential settlement and stress reduction ratio according to the area replacement ratio and the type of DCM, but the comprehensive review has shown that the reduction effect of maximum differential settlement and stress reduction ratio is greatest when reinforced with DCM columns and 2 Layers of geogrid whose tensile strength is 50kN/m. As a result of the analysis of reduction of differential settlement by Geosynthetic reinforcement and the reduction effect of stress reduction ratio, Geosynthetic reinforcement improved the load transfer effect to DCM columns that are installed for improvement ground and the reduction effect of differential settlement.