Stability of earth dam contaminated by chemical transport

When chemicals are introduced into the oil, they affect soil properties suc h as hydraulic conductivity and stress-strain behavior. In this study, seve ral chloride concentrations are varied from 0 to 20 per cent to analyse the effect of chemicals on soil properties. A series of laboratory triaxial te sts are performed on the cylindrical specimens of sand-bentonite mixture wi th different sodium chloride contents (5, 10, 15 per cent) by Nannapaneni.( 15) Deformation (elastic modulus, E) and strength (cohesion, c', and angle of friction, phi') parameters are obtained from the triaxial tests as funct ions of confining pressure and sodium chloride concentrations, and variatio ns of parameters are incorporated into stability analysis. The stress-strain-strength behaviour based on the above strength parameters is introduced in a finite element procedure with a modified residual flow procedure (RFP). By integrating a slope stability procedure in the finite e lement method, the stability with time of earth dam contaminated by sodium chloride is examined. It is found that increasing sodium chloride concentra tion for the soil considered increases stability. However, the procedure is general and can allow stability analysis under the influence of other chem ical which may lead to decrease in stability. Copyright (C) 1999 John Wiley & Sons, Ltd.