The Dabenliugou material yard slope at the Jinping I Hydropower Station is characterized by a 500-m grade steeply-inclined bedding rock mass, which is an ultra-high artificial slope. Based on the relationship between slope inclination and rock stratum inclination, the slope is further divided into the west side clockwise slope and the south side oblique slope. The west side slope exhibits various failure modes, including shallow sliding shear failure, deep sliding shear failure, compression shear buckling failure, and random block failure. The South inclined slope experiences fracture slip shear failure and random block failure. In terms of slope excavation, it is recommended to maintain a comprehensive excavation slope angle that does not exceed the dip angle of the underlying rock stratum. Additionally, the consideration of multi-level wide packways is crucial. For slope support, the use of long anchor cables is advised to prevent shallow and deep sliding failures. Lattice beams are also recommended to mitigate the risk of random block failure. During the excavation process, the artificial slope remained stable, with only the south side slope experiencing fractures, slips, and shearing. This case serves as an exemplary reference for the investigation, design, and construction of ultra-high artificial slopes.
