ABSTRACT:

There is a signal of a large scope integral landslide along the consequent fault F100 in the north slope of Dumu open pit of Gongchangling Mine. The height of landslide is about 10 m. The fault F100 surface is straight and there is a small amount of fault gouge in the fault zone, which plays a main role in controlling deformation and failure of slope. To clarify deep-seated occurrence of Fault F100, tri_electrodes sounding for fault survey have been carried out. The results show that deep-seated and upper occurrence of Fault F100 is similar. The depth is about 200m. The deep-seated dip angle of fault changes little. And then, analysis of stability of slope is done. According to this, it is proposed that cutting slope and reducing load is feasible for slope treatment.

1 INTRODUCTION

Compared with hydropower, road and railway projects, open pit slope engineering has its own unique characteristics. During the decades of exploitation Services, the overall slope mine gradually formed. Its stability is a key technical factor influencing mine safety from start to end. Along with the increase of mining depth, slope increased gradually, effect of unloading is more pronounced, failure probability is growing (Zhang et al. 2010). There are many factors affecting the stability of slope. Rock body of structure type, and structure surface of spatial composing relations is the key to internal based, especially with the same tendency of slope along the consequent structure surface, which is the controlling factors of slope stability. And extended hundreds of meters of consequent fault also should get attention, this tertiary structure surface is relatively small, and it is often neglected in the geological prospecting, but small landslide is enough to destroy the transportation system of open pit mine.

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