Prediction of Settlement of Embankment in Soft Soil Using Conventional and Elastoplastic Method

Abstract

Settlement Analysis and calculation is a paramount concern for any geotechnical engineer. The prediction of embankment settlement is a critically important issue for the serviceability of subgrade projects. To ensure the design grade of embankment, we have to calculate settlement specially differential settlement. Our thesis research is about the prediction of embankment settlement in soft type of soil and comparison between subloading tij model and conventional method. For this reason, we have selected the southern part of Bangladesh, Particularly, Khulna region. We have collected our soil sample from just one site – Sheikh Abu Naser Specialized Hospital area. We have collected soil sample from 3 different depths(6’,12’,18’) .From FEM tij model , we have calculated the settlement value=0.62 m and from conventional method the settlement value= 0.86 m. These two values are quite identical. So, our research is quite satisfying in this manner. For proper modeling of any soil. In this research, subsoil characteristics of study locations are presented based on field and laboratory test results. Elasto-plastic constitutive model parameters of study locations soil has been determined for extended sub-loading tij model. Using these parameters, settlement of embankment in soft soil has been estimated. Considering the effect of settlement in 1D Finite Element analysis has been conducted. It is found that settlement determined by the conventional methods match well with the results of the numerical simulations.