Swelling-shrinkage properties and hydraulic conductivity of a compacted coal mine tailing rock likely to be used for landfill capping
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Chair of Land Surface Protection Engineering, Lublin University of Technology, Nadbystrzycka 40B, 20-618 Lublin, Poland
Institute for Plant Nutrition and Soil Science of the CAU, Olshausenstrasse 40, 24118 Kiel, Germany
Int. Agrophys. 2007, 21(4): 405-408
The capping and remediation of municipal landfills require large amounts of soil material which should fulfil definite requirements with respect to hydraulic and shrinkage properties. One of such materials, likely to be applied for landfill capping and remediation, is tailing rock from Bogdanka (Lublin Region, Poland) coal mine. The effect of bulk density (1.35, 1.45, and 1.55 Mg m-3) on water permeability and on swelling/shrinkage properties of that material was studied under laboratory conditions. After the measurement of water permeability of the compacted material its pore water pressure was differentiated (-60, -300 and -500 hPa) and then it was re-saturated and again placed on tension plates of different water potential. During each test the pore water potential and the bulk density were measured. The changes of the properties of the material under investigation are discussed from the point of view of its potential application for the construction of landfill top liners.
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