University of Khartoum

Sand Compaction Piles (SCP) for Improving Embankment Foundations Case Study: Alhalfaya Bridge East Approach Road Embankment

Sand Compaction Piles (SCP) for Improving Embankment Foundations Case Study: Alhalfaya Bridge East Approach Road Embankment

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Title: Sand Compaction Piles (SCP) for Improving Embankment Foundations Case Study: Alhalfaya Bridge East Approach Road Embankment
Author: Mohammed Zein, Abdul Karim; Elgasim, Luai Elhusain
Abstract: This study investigates suitability of weak foundation soils for supporting the 12m high eastern approach earth embankment of Al Halfaya Bridge. The subsurface soils consist of soft silty clays and very loose to medium dense silty sand alluvial soils extending to 15m depth. Analysis of the results of a comprehensive geotechnical investigation carried out showed that the naturally occurring soils possess low bearing capacity and are expected to undergo excessively large settlements under the proposed embankment loads in case such soils have been treated. The soil investigation results also revealed that they have a very high potential for liquefaction in the event of an earthquake occurrence. A theoretical evaluation of the ‘sand compaction piles, SCP’ method for soil treatment is made in this study for improving the geotechnical characteristics to attain foundation soils adequately capable of supporting the proposed embankment safely. This has been resolved through the installation of sand piles with 1.1m diameter spaced at 2.5m interval distances in a square pattern. This design of SCP was found to improve the soil bearing capacity of originally weak foundation soils by 190%, to reduce consolidation settlement is reduced by 35%, to increase the safety factor against embankment slopes failure by 155% and significantly reduce the risk of soil liquefaction during any earthquake event.
URI: http://khartoumspace.uofk.edu/handle/123456789/9816
Date: 2012-02


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