Simple graphical methods for the analysis of displacement vectors during slope movements in surface mines

ABSTRACT

Approximately 1 million cubic metres of rock moved up to 7 metres on the day of peak movement at a surface coal mine in the Canadian Rockies. Three dimensional analyses of 16 displacement targets revealed that five moving blocks existed. An axis of rotation plunged at 70°. Two modes of sliding, i.e.: down the dip direction of the bedding and down the line of intersection of J1 and bedding were possible. A combination of J1 and J3 joint sets provided an almost vertical plane, with 80° dip, making the eastern edges of blocks 3 and 4. J3 joint set satisfied toppling criteria. A transitional stage was observed between sliding and toppling movements.