TEXTURAL DEPENDENCE OF SHEAR STRENGTH AND CONSOLIDATION OF COLLIERY WASTES FOR USE AS CONSTRUCTION MATERIALS
DOI:
https://doi.org/10.4314/njt.344.994Keywords:
minestone, suitability, engineering material, texture, shear strength, sub baseAbstract
Minestone and tailing from Enugu coal field were studied for the evaluation of their suitability as geotechnical engineering material based on their texture, shear strength and consolidation. The pH, sulphate content, specific gravity, particle size distribution, consistency limits, compaction and consolidation tests of these wastes were first carried out. Direct shear strength tests were then done on the grain size ranges of > 4.25 mm, 4.25 mm – 600 ?m, 600 – 150 ?m and < 150 ?m of the wastes. Results showed that the mine stone was non-plastic and the tailing medium plastic materials, and that they compacted to fairly high density of 1.45-1.57 Mg/m3, respectively. The effective peak and residual friction angles of the mine stone ranged between 42° 07’ - 38° 17¹ and 38° 40¹ - 37° 11¹, respectively. The tailing had peak shear strength ranging from 0 to 85 kN/m2 and friction angles less than the minestone. The results showed that the wastes are good for subgrade, sub-base, filling, and for earth dam and embankment construction.
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