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Leeds, United Kingdom

Preene M.,Golder UK Ltd | Brown D.,Golder UK Ltd
Proceedings of Institution of Civil Engineers: Waste and Resource Management | Year: 2012

There are significant economic and environmental drivers for the reduction of industrial energy usage, and there is a corresponding interest in renewable and alternative sources of energy. Ground energy systems are an established low and zero carbon dioxide technology widely used in the UK outside the waste management industry to reduce energy consumption and carbon dioxide emissions associated with the heating and cooling of buildings and industrial processes. To date very few ground energy applications have been implemented on waste management sites. This may be a missed opportunity because many sites contain heat sources (including landfilled waste, leachate and compost) at elevated temperatures relative to natural ground. If these heat sources can be exploited and matched to on-site or off-site heat demands there are considerable opportunities to reduce energy costs, improve environmental performance and provide additional revenue streams to site operators. Source

Zhang B.,Golder UK Ltd | Fowmes G.,FCC Environmental | Russell D.,Golder UK Ltd | Jones V.,Golder UK Ltd
Proceedings of Institution of Civil Engineers: Waste and Resource Management | Year: 2012

The capping system is one of the major structural elements in modern landfills. When using artificial sealing materials (e.g. a geomembrane) as the capping liner, the stability of the cover soils and integrity of the geosynthethics need to be assessed. Traditional design methods only consider uniform cover soil thickness with different degrees of saturation and seepage build-up (i.e. parallel submergency ratio). This paper proposes an analytical method which includes the seepage build-up in the stability analysis for the capping slope with a tapered cover soil profile, that is when cover soils become thicker from top to bottom. Both the parallel (modified) and horizontal seepage force build-up patterns have been considered and analysed. The proposed analytical methods are applied to a design case in which uniform thickness cover soils are considered. The results are comparable to those of the traditional methods and therefore they are verified. Parametric analyses have confirmed the tapered profile can effectively improve the capping slope stability and indicated that the interface shear strength (between the cover soil and the underlying geosynthetic) and cover soil shear strength have the most significant effects on the capping slope stability. Source

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