A STUDY ABOUT FACTORS WHICH CAUSED RAILWAY EMBANKMENT DAMAGES BY CIRCULAR SLIP ANALYSIS

Abstract

 The 2011 Off the Pacific Coast of Tohoku Earthquake caused damages of railway embankments in East Japan area widely. We calculated the deformation of damaged and no-damaged railway embankments in 10 areas. We used the Newmark method (circular slip surface analysis) for calculating the deformation.
 This study says that railway embankments of which yield seismic intencity is less than 0.3 was severely damaged. Neverthless, those of which yield seisimic intencity is over than 0.3 was severely damaged in case that the groundwater leve was high, and the fine fraction content of lower embankment materials or upper ground soils were less than 35%, or bearing stratum contained thick organic soil layer.