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Abstract The height of the excavated slope on the right bank of Zaoshi hydropower project reaches 110 m. Before the excavation, the deformation and failure were forecasted according to the geologic structure and numerical modeling. The slope is composed of Devonian sandstone and Silurian shale. The strike direction of the stratum is almost perpendicular to the river，which is favorable to the slope stability. But three sets of discontinuities could compose some blocks and cause local instability. In the early stage of excavation above 146 m of the right abutment，some fissures and deformation occurred. So the reinforcement by pre-stressed cables and the drainage tunnel at different altitudes were then performed following the excavation. The monitoring system is in function during and after the excavation，showing that the treatment is effective.
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Received: 11 September 2007
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