ABSTRACT:

The study concentrates on the safety factors involved in rock slope stability of an open-pit porphyry copper mine. The analysis of the safety factors are based on the comparison of different optimized slope angles and the slope stability in different geological zones is also included in the research. By applying the methods of Flac3d and the limit equilibrium analysis, it can determine the possible failure zone and reasonable slope angle for open-pit mining. The conclusion is a great contribution to the following mining design and further production practice for open pit mining.

1 SURVEY OF MINING AREA

The mining area is located in the oblique east wing of the back of Xibeikulasi, and is relatively flat, which belongs to the low mountain hilly terrain. The altitude is 770 meters, the relative elevation is generally of 5 to 15 meters, and the scope of mineralization is an oval area with the length and width of about 1.0 km. The exposed stratum is Xibeikulasi Shangya Formation (C1X2) and Baogutu Xiaya Formation (C1B1) of Lower Carboniferous Series. The stratum is in nearly north-south direction, with tendency to the east and the dip angle of 60° to 70°.

2 SLOPE ROCK MASS QUALITY CHARACTERISTICS

The partition of the geology of the copper mine project is taken according to the surrounding topography and lithology around the area, combined with field geological survey and additional exploration results. During the partition, the hydrogeological conditions, fault joints and the engineering factors and geological factors of the crushed zone have been overall considered. The strip mine is divided into six.

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