Interface Shear Strength of Compacted Clay Liner with Parent Foundation Soil of Turamdih Dam Site and Some Geo-Textile Materials in Composite Liner System
Authors
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Dept. of Environmental Science and Engineering, Indian School of Mines, Dhanbad ,IN
Brahm Deo Yadav -
Dept. of Environmental Science and Engineering, Indian School of Mines, Dhanbad ,INS. K. Gupta
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Dept. of Applied Geology, Indian School of Mines, Dhanbad ,INS. Singh
Keywords:
Landfill Liner Interface, Composite Liner System, Shear Strength, Optimum Moisture Content, Large Scale Shear Box.Abstract
The generation of large quantity of tailing from different ore mines needs an environmentally friendly manner and safe way of disposal. In the case of uranium mineralization the concentration of uranium is very low as compared to other ores deposits and hence the requirement of comparatively larger space for storage of uranium tailing is inevitable. Intense public concern regarding the environmental and health effects of uranium tailings has forced a re-evaluation of past disposal practice. Seepage from bottom and sides need to be protected to avoid underground water pollution to the nearby surrounding areas.
Early liners consisted primarily of a single liner composed of a clay layer or a synthetic polymeric membrane. During the past few decades the trend is to use composite liner systems comprising both clay and synthetic geo-membranes together with interspersed drainage layer. The basic environmental guide lines have contributed in developing suitable liner and hydraulic barriers for landfill site.
The present study involves selection of alternatives between locally available soil of Turamdih dam site with different % of bentonite and fly ash. The choice among them is presented by assessing geotechnical properties of different alternatives. This work addresses the study conducted on performance of landfill liner interface parameters. The stability of composite liner system is based on the evaluation of interface shear strength between (i) Soil and CCL (ii) Geo membrane (HDPE or PVC) and soil (iii) GCL/CCL and soil (iv) Geo-textile and soil (v) GCL/CCL (vi) Geo-membrane and GCL/CCL. The current testing procedures are based on ASTM testing guidelines, where large scale shear box apparatus is proposed to be used for the tests with certain modification.
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