Stability analysis on Tingzikou gravity dam along deep-seated weak planes during earthquake

doi:10.1007/s11709-012-0146-x

Front Struc Civil Eng

2012, Vol. 6

Issue (1) : 69-75 https://doi.org/10.1007/s11709-012-0146-x

CASE STUDY

Stability analysis on Tingzikou gravity dam along deep-seated weak planes during earthquake

Weiping HE, Yunlong HE(

)

State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China

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Abstract

The stability of a gravity dam against sliding along deep-seated weak planes is a universal and important problem encountered in the construction of dams. There is no recommended method for stability analysis of the dam on deep-seated weak planes under earthquake condition in Chinese design codes. Taking Tingzikou dam as an example, the research in this paper is focused on searching a proper way to evaluate the seismic safety of the dam against sliding along deep-seated weak planes and the probable failure modes of dam on deep-seated weak planes during earthquake. It is concluded that there are two probable failure modes of the dam along the main weak geological planes in the foundation. In the first mode, the concrete tooth under the dam will be cut and then the dam together with part foundation will slide along the muddy layer; in the second mode, the dam together with part foundation will slide along the path consist of the weak rock layer under the tooth and the muddy layer downstream the tooth. While there is no geological structure planes to form the second slip surface, the intersection of the main and the second slip surface is 40 to 80 m downstream from dam toe, and the angle between the second slip surface and the horizontal plane probably be 25 to 45 degrees.

Keywords gravity dam deep-seated weak planes stability against sliding earthquake

Corresponding Author(s): HE Yunlong,Email:ylhe2002@yahoo.com.cn

Issue Date: 05 March 2012

Cite this article:

Weiping HE,Yunlong HE. Stability analysis on Tingzikou gravity dam along deep-seated weak planes during earthquake[J]. Front Struc Civil Eng, 2012, 6(1): 69-75.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-012-0146-x
https://academic.hep.com.cn/fsce/EN/Y2012/V6/I1/69

Fig.1 General layout of Tingzikou project

Fig.2 Calculation of safety factor when slip surface is combined by two planes under static load

Fig.3 Dam-foundation model

Tab.1 Parameters of concrete and materials in foundation

Fig.4 Time history of acceleration of inversion of artificial wave. (a) Stream direction; (b) vertical direction

Fig.5 Distribution of weak planes

Tab.2 Range of weak planes

Fig.6 Model experiment by Yangtze River scientific research institute

Fig.7 Yield region of foundation after earthquake

Fig.8 Minimum safety factor against local failure on geological structure planes

Fig.9 Typical slip surface

Fig.10 Relation between safety factor and dip angle . (a) Slip out at dam toe; (b) slip out at 60 m away dam toe

Fig.11 Relation between safety factor and location of point

Fig.12 Two probable critical slip surfaces

Fig.13 Safety factor of two probable critical slip surfaces during earthquake. (a) ; (b)

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