Authors: XU Jia-cheng *, XUE Wei-cheng **, ZHI Cheng-jie **, SUN Ping *

* China Institute of Water Resources and Hydropower Research, Beijing 100048, China

** Changjiang Institute of Survey, Planning and Design Co., Ltd., Wuhan 430010, China

Abstract: Tingzikou gravity dam, the highest gravity dam in the Hongyan rock areas in China, is located on a foundation with adverse soft rocks, bedding planes and weak seams dipping downstream. These adverse geological conditions result in a severe deep-seated sliding stability problem for Tingzikou gravity dam. By using a generalized limit equilibrium method developed by IWHR (all slices have the same value of factor of safety) and limit state design method suggested by Chinese Design Specification for Concrete Gravity Dams (DL 5108-1999), the deep-seated sliding stability of a surface-outlet monolith was analyzed and the effect of inter-slice/inter-wedge force angel φ on the stability results was also investigated. The analysis results obtained by the above two methods indicate that the deep-seated sliding stability basically satisfies Chinese Design Specification for Concrete Gravity Dams (SL 319-2005) when φ = 0°. When the inter-slice force angle is not equal to zero, the factor of safety increases with φ, with φ = 5° to10° recommended for Tingzikou gravity dam.

Key words: Tingzikou gravity dam, deep-seated sliding stability, generalized limit equilibrium method, limit state design method

Published in: Journal of China Institute of Water Resources and Hydropower Research, Vol. 9, No. 2, 2011

Article ID: 1672-3031 (2011) 02-0125-07