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Abstract Because of the limit of landform of damsite，the inlet slope of the diversion tunnel of the Changheba hydropower station has to be designed vertically with the biggest height of 148m. This situation is seldom to meet at home and abroad，and its deformation，stability issues related to the success of the project diversion program is very important to the construction of the hydropower station. To know the stability of the slope as well as the effectiveness and reasonability of reinforcement，the FEM is used to model the excavation and reinforcement process of the slope，and the deformation，yield zone and the bolt stress distribution are obtained. Especially，the analysis of the impact of cracks and fissures for the slope deformation，yield stress，as well as anchor. The strength deduction method is also used to calculate the safety factor of the stability. Finally，some conclusions are discussed which are helpful to guide the excavation and reinforcement of the slope.
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Received: 13 May 2009
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