Work to evaluate the effectiveness of innovative geotechnical repair techniques for slopes has been commissioned by Highways England (HE). The techniques are the planting of live willow poles, Fibre Reinforced Soil (FRS) and Electrokinetic Geosynthetics (EKG). These techniques were used in place of conventional approaches in order to reduce the overall impact of various challenges including environmental constraints (habitat and visual), access and utility constraints, and to address the need to reduce the scale and/or cost of traffic management and traffic delays. 

This report presents an assessment of the effectiveness of EKG treatment to increase the stability of highway earthworks, and is one of a series for this project. The use of EKG treatment to aid slope stability has been widely written about and the associated benefits are often described as follows: 
• Electroosmotic active dewatering, leading to a reduction in water content, pore water pressures, consolidation and an increase in shear strength. 
• Physio-chemical changes in the soil, such as cementation, precipitation, ion exchange and flocculation, which can lead to increases in shear strength, stiffness and a reduction in plasticity. 
• Temporary active EKG drainage and permanent passive drainage provided by the EKG cathodes. 
• Soil nail reinforcement provided by the EKG anodes with an enhanced soil/nail bond.

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