Behavior of rockfill dam under complex terrain condition
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ORIGINAL PAPER
Behavior of rockfill dam under complex terrain condition Yucong Gao 1 & Huabei Liu 2 & Myoung-Soo Won 1 Received: 20 May 2020 / Accepted: 15 September 2020 # Saudi Society for Geosciences 2020
Abstract The behavior of concrete face rockfill dam (CFRD) is more dependent on valley terrain than rockfill deformation. The objectives of this study are to research the influence of valley topography condition on the deformation and stress of a CFRD, especially with relevance to the behavior of face slab under complex terrain conditions. First, the research on the effect of valley shape factor on perimeter joint deformation used monitoring data with a combined total of 22 CFRDs from 8 countries. The results show that the perimeter joint deformation decreases nonlinearly with increasing valley shape factor A/H2. A/H2 = 2 ~ 4 or L/H = 2 ~ 5 can be considered an intervenient valley which contains both characteristics of the narrow and wide valley. Then, numerical analysis is applied to predict the behavior of Nam Ngum 2, a 182-m-high concrete face rockfill dam, during initial impoundment via a threedimensional finite element analysis. A series of finite element analyses aimed at investigating the influence of the intervenient valley and complex topography condition which in turn depends on slope angle and angle mutant of the abutment on stress and deformation of concrete face slab on CFRD. All results indicate that the arch effect is crucial to deformation and stress of the CFRD in the intervenient scale of valley shape factor. Steeper slope and convex catastrophe point in abutment rapidly aggravate the tensile stress of the face slab and the deformation of the joints, which threaten the safety of the impervious system of CFRD. The hardening soil model is used in the nonlinear analysis for rockfill, and the results show that a good agreement between computed results and dam field monitoring data can be achieved. Keywords Valley shape factor . Concrete face rockfill dam . Abutment slope angle . Deformation and stress . Slope angle mutant
Introduction Concrete face rockfill dams (CFRD), with their majority advantages, such as rapid construction and low cost, inherent flexibility, and excellent resistance to seismic loading, are gaining a broad recognition in many parts of the globe in recent years. Concrete face slab as an important component of the impervious system is the principal concern in CFRD design. The concrete face slab is thinner and flexible compared with whole rockfill material. However, the existent main issue with relevance to concrete face slab in the operation period is that the impervious system is threatened by Responsible Editor: Zeynal Abiddin Erguler * Yucong Gao [email protected] 1
Department of Civil and Environmental engineering, Kunsan National University, Gunsan 54150, Republic of Korea
2
Architecture and Civil Engineering, Huazhong University of Science & Technology, Wuhan 430074, China
penetrating cracks that occurred on the face slab. The main causes, which lead to the p
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