Abstract
This paper reports the results of a test programme to determine the friction characteristics of polypropylene straps embedded in compacted colliery spoil. These straps are being considered as an alternative to traditional high adherence galvanized steel straps because of possible corrosion problems associated with steel straps. Laboratory tests have been performed to assess the suitability of colliery discards as backfill material and the soil-strap interaction. The test results showed that the more angular fill gave higher pull-out resistance and friction values. The results provide information on the friction characteristics which can be used in the design of reinforced earth retaining walls using compacted coal wastes as the fill material. Finally, comparison is made of the cost benefits of using these materials in a more conventional structure.
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