Time filter

Source Type

Newcastle upon Tyne, United Kingdom

Lamont-Black J.,Electrokinetic Ltd | Jones C.J.F.P.,Northumbria University | Alder D.,Electrokinetic Ltd
Geotextiles and Geomembranes

Traditional embankment stabilisation techniques can have severe environmental impacts during construction and frequently leave behind a stark legacy of a bare embankment unsuitable for wildlife and unsightly for local residents. Electrokinetic geosynthetic (EKG) strengthening of slopes is a multi-component treatment method which includes dewatering by electro-osmosis; reinforcement; drainage and soil modification. The method offers economic and environmental benefits. This paper provides a brief review of the electrokinetic concept as it applies to failed slopes and illustrates the method with respect to the design, analysis, construction and verification of the stabilisation of a strategically important and environmentally sensitive highway embankment. The strengthening of the slope was achieved with a 29% reduction in cost and a 40% reduction in carbon footprint when compared to an adjacent embankment which had been remediated a year earlier using conventional soil nails. Following the repair the scheme was awarded an Institution of Civil Engineers Award for Innovation and a Green Apple Award for excellence in sustainable construction. © 2016 Elsevier Ltd. Source

Jackson C.,Amey | Lamont-Black J.,Electrokinetic Ltd | Alder D.,Northumbria University | White C.,Electrokinetic Ltd
Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2015

Repair of earthwork failures involving landslips represents significant expenditure across the UK highways network each year. Traditional engineering solutions involve excavation and import of new construction materials, resulting in waste requiring off-site disposal to landfill and a relatively high carbon footprint. Working for the Highways Agency in England, Amey proposed remediation of a failing embankment using the pioneering electrokinetic geosynthetic treatment technique. This innovative technique involves in-situ remediation of the failed soil masses rather than excavation and replacement, with the potential for reduced vegetation clearance and a much lower carbon footprint. This scheme is one of the first pilot schemes implementing the technique on a full scale remediation project and involved close collaboration between Amey, their contractors, the Highways Agency and Electrokinetic Ltd. This paper outlines the design and implementation aspects of the project and summarises the findings of the post construction verification. © The authors and ICE Publishing: All rights reserved, 2015. Source

Jones C.J.F.P.,Electrokinetic Ltd | Lamont-Black J.,Electrokinetic Ltd | Glendinning S.,Northumbria University | White C.,Electrokinetic Ltd | Alder D.,Northumbria University
Proceedings of the Institution of Civil Engineers: Engineering Sustainability

Failures of cut and embankment slopes are common and expected to increase. Conventional repair techniques include acquiring additional land, reducing the slope angle, installing drainage improvements, soil nailing and/or providing structural support. All of these methods have technical limitations and most cause considerable environmental disturbance. However, new stabilisation options that are more effective and economical than traditional approaches are becoming available, one of which is electrokinetic geosynthetic treatment of failing or failed slopes. The benefits of electrokinetic geosynthetic treatment in terms of engineering sustainability include reduced cost, reduced 'carbon dioxide footprint', fewer heavy goods vehicle movements, zero waste removal, minimal material import, reduced noise and vibrations, improved air quality, preservation of the seed bank and soil environment, minimal vegetation clearance with almost all trees being retained, no visual impacts, no disruption to passing motorists and less damage to root protection areas. Protection of the habitat is also beneficial to nesting birds, amphibians, dormice and reptiles. The paper provides a brief description of the electrokinetic geosynthetic treatment method and illustrates the engineering sustainability with two case histories. Source

Alder D.,Northumbria University | Jones C.J.F.P.,Electrokinetic Ltd | Lamont-Black J.,Electrokinetic Ltd | White C.,Electrokinetic Ltd | And 2 more authors.
Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2015

Many conventional approaches to the repair of slopes such as reducing the slope angle, installing additional drainage, soil nailing and providing stability by structural methods have their limitations and often have high environmental and economic costs. An alternative is the use of electrokinetic techniques, which, among other factors, have been shown to offer significant reductions in cost and carbon footprint. Electrokinetic Geosynthetic (EKG) slope stabilisation combines ground improvement, reinforcement and drainage into a single treatment and is applicable to cuttings, embankments and natural slopes in fine grained soils. The design parameters include anodecathode spacing, applied voltage and treatment duration for electro-osmotic ground improvement; anode orientation, diameter, bond strength and element spacing for mechanical reinforcement and also filtration functionality for active and passive drainage. Flexibility in both design and construction allow for optimisation of technical parameters with economic and environmental constraints. The key economic variables arising from the design include the supply and installation of electrodes and the duration of treatment. Owing to the multifunctional nature of the technique the geomechanical remediation is distributed amongst several factors which contribute to the overall improvement of slope stability. This method has no requirement for large, intrusive construction plant which has knock-on benefits for reducing construction safety hazards and environmental disturbance such as the removal of trees, vegetation, topsoil and habitat disruption. This paper presents the design principles that have been used by Electrokinetic Ltd. for EKG slope stabilisation and illustrates how they have been implemented during fully-commercial projects on the UK's highways network. © The authors and ICE Publishing: All rights reserved, 2015. Source

Lamont-Black J.,Electrokinetic Ltd | Hall J.A.,Northumbria University | Glendinning S.,Northumbria University | White C.P.,Electrokinetic Ltd | Jones C.J.F.P.,Electrokinetic Ltd
Geological Society Engineering Geology Special Publication

A trial was conducted on a Victorian embankment to evaluate the use of electrokinetic geosynthetics for embankment stabilization. The embankment had been constructed by end tipping London Clay fill onto unprepared ground and has a history of instability. Ground investigations indicated a core of firm material underlain by softened embankment fill and alluvium and overlain by softened material towards the ground surface. The slope was treated to a maximum of depth of 7 m using electrokinetic geosynthetics and electrokinetic soil nails. Over a period of 42 days, electrokinetic treatment forced water out of the ground by raising it > 4 m above the initial groundwater level such that discharge from activated electrokinetic prefabricated vertical drains (ePVDs) was > 25 times that of control drains. Cation exchange processes were active as part of the treatment and correlated with reductions in plasticity and shrinkage. Overall DC power consumption was approximately 11.5 kWh m-3 of soil treated. Post treatment boreholes demonstrated that the soft material beneath the embankment had become firm and exhibited apparent improvements in both undrained and drained strength parameters. Pull-out tests on electrokinetic soil nails demonstrated an improvement in the bond strength of the nails by an average of 263%. Inclinometer data showed a significant reduction of movement tending to zero after treatment. © The Geological Society of London 2012. Source

Discover hidden collaborations