Weathering makes the hard and compact rock loosely damaged, resulting in great reduction of rock's strength and stability, which has a negative impact on the engineering construction. Most of the unfavorable geological phenomena such as landslides, collapses, shatters and mudslides are gradually formed and developed on the basis of weathering. Therefore, it is of great practical significance and engineering value to study strength evolution law of rock under weathering and to explore the influence of weathering on slope stability. This paper presents an excavation slope of a hydropower station to study the failure mode and overall stability of bedding rock slope under consideration of different weathering depth and mechanical parameters. The hydropower station is Chinese first oversea hydropower project but fully adopts the domestic design standards. The slope height is 80m~85m and the rock masses are sandstone, argillaceous siltstone and silty mudstone. Affected by cracks and groundwater in the upper sandstone, several weak fractured interlayers have been formed between sandstone and argillaceous siltstone or silty mudstone, which is unfavorable to the stability of this slope. Strength reduction method and limit equilibrium method are adopted to analysis the slope stability. The research results can provide reference for studying the weathering effect of similar rock slopes, and can be useful for rational design and effective protection of slopes.

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