Many conventional methods of soil/waste treatment are available that have a negative impact on the ecosystem. Natural polymers (biopolymers) are considered as eco-friendly and sustainable grouting additives that strongly react with water to produce a viscous suspension. This research study investigates the influence of biopolymer on the undrained shear strength and hydraulic characteristics of coal mine overburden dump, which is widely considered for the construction of embankments and water-retention structures around mines. Two biopolymers were employed, xanthan and guar gum, over a range of concentrations (0·25–1·5%). Experimental results indicate the significant enhancement of shear strength parameters with an increase in concentration and the curing period. Permeability tests, carried out for a long term, also showed a change in hydraulic conductivity values, which are dependent on biopolymer concentration and the ageing period. Thus, it can be concluded that the application of biopolymers as temporary seepage barriers for the protection of many geotechnical works (such as foundations) and underground structures is highly beneficial.

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