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Abstract The right abutment slope of Changheba hydropower station belongs to high and steep rock slope. During its excavation，sixteen cracks have been found successively；the stability and subsequent excavation of slope have been significantly influenced. Based on the analysis of geological conditions，rock mass structures and monitoring data，major deformation zone and direction of the slope have been defined；the main reasons of the deformation and cracking are deduced；potential instability mode is formulated；and suggestions are made for further excavation and reinforcement. The joint set J1 has been exposed during slope excavation. The shear deformation has happened along the joint set J1，then the upper rock mass has been dragged along joint set J4. The platy rock mass on the slope top tends to overturning. Finally the fault F0 and its footwall rock produce compression deformation，and subsidence of its last plate rock aggregates the deformation of the slope top. The mode of potential instability is toe sliding-middle tension-rear overturning. After implementation of reinforcing measures，the cracking and deformation have been controlled successfully and the slope is basically safe.
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Received: 06 December 2011
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2012, Vol. 31 
