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Permanent capping of temporary waste slopes: the challenge of declining waste streams

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conference contribution
posted on 12.05.2015, 14:29 by Gary Fowmes, Katarzyna A. Zamara
With diminishing waste streams many sites now face closure before filling to intended profiles. As a result, slopes which were intended as temporary waste slopes now require permanent capping solutions to be installed. These slopes are often steep and challenging to cap. Various stability and integrity issues arise with solutions including the use of reinforcement within the capping layers. However, on long slopes the total forces are often large and anchorage on benches can be problematic. Tapering the cover soils can achieve a stable solution; however, large soil volumes may be required to achieve a satisfactory resistance to failure. This paper considers a case study of a 72m high temporary waste slope requiring a permanent capping solution. Interface shear strength is critical on such steep slopes and sampling, testing and interpretation requires careful consideration. A number of shear strength tests were carried out as part of the project and this paper shall consider the designer's concerns around the interpretation of these tests for use in stability analysis. As part of construction of the regulating soil, variable material was delivered to site, some with moisture content higher than specified, thus potentially reducing the strength and introducing a weak layer. This paper considers the challenges in stability risk assessment, data interpretation and future instrumentation requirements at the site.



  • Architecture, Building and Civil Engineering

Published in

10th International Conference on Geosynthetics, ICG 2014


FOWMES, G.J. and ZAMARA, K.A., 2014. Permanent capping of temporary waste slopes: the challenge of declining waste streams.IN: Proceedings of the 10th International Conference on Geosynthetics, ICG 2014, 21st-25th September 2014, Berlin.


Deutsche Gesellschaft fur Geotechnik e.V.


AM (Accepted Manuscript)

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This is a conference paper.