Use of Lime Piles as an Alternative Method for Stabilisation of Road Embankments

Abstract

The durability and performance of an embankment depends on its stability. Several options are available for controlling stability and settlement problems associated with embankment slopes. One of them involves using stabilising agents which are suitable for the existing embankment. This research focused on improving the engineering properties of clay soil insitu by using lime pile technique. The clay soil was obtained from a failed embankment along Kamwenge – Fort portal road, chainage 18 + 900. Preliminary tests were carried out to determine if the soil required stabilisation. It had a high liquid limit of 58.6%, plastic limit 26.5% and plasticity index of 32.1. It was classified as CH using the Unified Soil Classification System. Various tests were carried out, for curing days of 14, 21 and 28, to investigate the effect on the engineering properties of the soil. Results showed an increase in Maximum Dry Density, shear strength and a decrease in Optimum Moisture Content and plasticity index hence improved soil properties for embankment slope stability.