Experimental and numerical analyses on working performance of a high arch dam with deep-seated joints: Yebatan arch dam,
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ORIGINAL PAPER
Experimental and numerical analyses on working performance of a high arch dam with deep-seated joints: Yebatan arch dam, China Wen Zhang 1 & Yuan Chen 1 & Bao-quan Yang 1
&
Lin Zhang 1 & Chong Zhang 2 & Xiao-qiang Liu 2
Received: 21 June 2018 / Accepted: 11 January 2019 # Saudi Society for Geosciences 2019
Abstract High arch dams commonly face complicated geological conditions at the dam site, which is particularly prominent in numerous projects in the southwest mountainous area of China. The deep-seated joint is a special geological defect caused by unloading fracturing of the deep rock mass, which is unfavourable to the working performance of high arch dam projects. The Yebatan arch dam is a world-class high arch dam, situated in a deeply carved V-shaped gorge with deep-seated joint zones in both banks. In this paper, both geomechanical model test and numerical analysis are carried out to study the working performance of the Yebatan arch dam and abutment, which are affected by the deep-seated joint zones. The research results demonstrate that the deep-seated joint zones have a significant effect on the arch dam and abutment working performance. It is highly dependent on the location of the class IVS strong relaxed rock mass and the combination with faults. The class IVS strong relaxed rock mass in the left abutment has a great impact on the deformation of arch dam and abutment, and fault f29 (f74) plays a dominant role in controlling the anti-sliding stability of the right abutment. Subsequently, a kind of concrete replacement measure is proposed in order to treat these project weaknesses. The additional numerical analysis results indicate the deformation and stability performance of arch dam and abutment are greatly improved after reinforced. The reinforcement measure is effective for Yebatan project. Keywords Deep-seated joint . Geomechanical model test . Numerical analysis . Yebatan arch dam . Working performance . Reinforcement measure
Introduction With the continual development of hydropower projects, high arch dam has gradually become one of the main dam types for large-scale hydropower station projects globally (Hennig et al. 2013; Song et al. 2015). Compared to other dam types, arch dam offers the advantages of superior economy and higher overloading capacity. However, a high arch dam has more stringent geological condition demands, owing to the high structural stability and engineering safety requirements (Ren et al. 2012). Numerous high arch dams have been built in the
* Bao-quan Yang [email protected] 1
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China
2
Power China Chengdu Engineering Corporation Limited, Chengdu 610065, China
southwest alpine valley areas of China, with some still under construction at present (Wang et al. 2013; Zhu et al. 2015; Yin et al. 2015). Most of these high arch dams are situated in high mountain valleys with complicated geological conditions (Pa
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