GEOTECHNICAL STUDY AND SLOPE DESIGN OF A PHOSPHORITE MINE

This paper aims at examining how the data for the geomechanical proper ties of slope material and for groundwater condition can be precisely and quickly collected, evaluated, and best used for optimum slope desi gn in a block of phosphorite in an open cast mine. It is also directed at determining the influence of all the slope design parameters on th e safety factor by using sensitivity analysis, which indicates that th e effect of groundwater and friction angle is prominent in the slope. Suitable remedial measures, e.g., proper drainage and design of high s lopes with relatively safe slope angle, have been planned for the crit ical slopes after sensitivity analysis. Monitoring of the designed slo pes has revealed no movement.