Report No. : GEO Report No. 376

Report Title :Detailed Study of the 8 and 14 September 2023 Landslides on Slope No. 11SE-D/F47 at Shek O Road, Shek O (2024), 74 p.

Author : Fugro (Hong Kong) Limited

Abstract

This report presents the findings of a detailed study of landslides (Incident No. 2023/09/3265) that occurred at a roadside registered fill slope (slope No. 11SE-D/F47) at Shek O Road, Shek O, following rainstorms on 8 and 14 September 2023. The first landslide occurred on the morning of 8 September 2023, during which both Black Rainstorm Warning and Landslip Warning were in effect. The landslide was a sliding failure with an estimated volume of about 650 m³. As a result, a section of the northbound lane of Shek O Road collapsed, and most of the landslide debris was deposited below the failure scar. The second landslide happened on the morning of 14 September 2023, when a Red Rainstorm Warning was in effect. The landslide was a washout failure with an estimated volume of about 126 m³. The previously closed northbound lane collapsed again, including the newly placed rockfill of post-landslide emergency repair works for the first landslide. No casualties were reported, but the blockage of Shek O Road isolated hundreds of residents from Shek O.

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