DESIGN OF HIGHWAY EMBANKMENTS USING FLYASH IN ALTERNATE LAYERS

Abstract

Most of the Indian cities are unable to manage the traffic on important lanes and Intersections at grade. To construct new lanes and grade separation intersections, require large quantities of material for construction of embankments as well as roads and also large investments if the conventional methods of construction arc used. The alternate is to use low cost techniques by using industrial wastes like fly ash, available enormously and almost at free of cost which otherwise causes environmental and disposal problems. To solve this problem, efforts have been made for maximum utilization of flyash in embankment construction in hulk quantities. There are various methods of stability analysis of embankments. The important methods are Friction circle method, Swedish circle method, Bishop's method, Janbu's method, Morgenstern and Price Method, Sarma's method, Kovari and Fritz's and UOR method. The suitability of these methods depends upon the site conditions and material used. During the last two decades, some embankments have been constructed using flyash. The approach road to New Nizamuddin Bridge and the Vishveshvaraya Setu in Delhi are among the successful projects. The present dissertation work consists of two stages. The first stage includes the development of software package for stability analysis of embankments using C language for non-circular slip surface and non-vertical slices. In the second stage properties of the soils and fly ash are determined. Finally a relationship between factor of safety, slope and height of fly ash embankments was developed. An attempt is also made to review the various studies that had been carried out in the utilization of fly ash in the embankment methods of stability analysis of embankment slopes. Physical and engineering properties of fly ash have also been discussed.