3-Dimensional effects on slope stability of high waste rock dumps <中文篇名〉=高废石堆场斜坡稳定性的3维效果

摘要

A knowledge of angle of repose and stability ofwaste rock dump slopes is of vital importance at all mine sites.Conventional slope stability analyses model slopes in plane strain.In reality, slopes advance in a curvilinear pattern in plan and henceproduce slope faces that are either convex or concave in plan. Thethree-dimensional shape of the waste rock dump is similar to thatof a solid body of revolution, which may be modelled using a two-dimensional grid and a radial coordinate system. A 250 m high in-pit waste rock dump at Kidston Gold Mines Limited, NorthQueensland, Australia was modelled using this technique. Theanalysis showed that adopting a non-linear Mohr-Columbenvelope resulted in a more deeply-seated failure plane than wouldoccur using a linear envelope. A slope with a concave advancingface in plan was stable an angle at least 2°steeper than anidentical slope advancing in a straight line in plan. On the otherhand, a convex advancing slope was only just stable at an angle of0.5°flatter than an identical slope advancing in a straight line.