Analysis of stability of the Baihetan arch dam based on the comprehensive method
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ORIGINAL PAPER
Analysis of stability of the Baihetan arch dam based on the comprehensive method Wenlong Lyu 1 & Lin Zhang 1,2 & Baoquan Yang 1 & Yuan Chen 1 Received: 11 April 2019 / Accepted: 13 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this paper, the stabilities of the Baihetan arch dam were analyzed by combining a geomechanical model test and the 3D nonlinear finite element method (FEM) based on the comprehensive method. The deformation characteristics and failure patterns of the dam, abutments, and foundations under different overload conditions were modeled and analyzed by the geomechanical model test. Then, the 3D nonlinear finite element calculation was conducted for complement and verification, by which the deformation characteristics and plastic failure zones of the dam and foundation under different overload stages were simulated. Based on the deformation behaviors, failure pattern, and the development of plastic zones of weak structure planes and rock mass in the dam’s abutments and foundation, the impacts of weak structure planes on the safety coefficient of dam abutment and foundation were analyzed. The geomechanical test results and FEM results demonstrated consistency in this study and provided an important basis for engineering safety assessment. The results indicated that the Baihetan arch dam meets the principal stability requirements; however, considering the large deformation and serious cracks in the middle-upper part of the left dam abutment, reinforcement treatment is proposed to improve the abutment stability of the Baihetan arch dam. Keywords Stability . Baihetan arch dam . Geomechanical model test . Finite element method
Introduction With the vigorous development of hydropower in China, a large number of high arch dams have sprung up, such as Xiaowan (294.5 m high), Jinping I (305 m high), Xiluodu (285.5 m high), Baihetan (289 m high), and Wudongde (265 m high). Most of these projects involve great dam heights and huge reservoir capacities, and are characterized as having large flood discharge capacity, powerful earthquake intensities, and complicated geological conditions (Zhou et al. 2005). The stability of these high arch dams has attracted great attention (Gillan et al. 2011; Ren et al. 2011; Engemoen et al. 2014; Brown 2017). The most widely used methods for evaluating the stability of a dam abutment and foundation are the geomechanical model test and the finite element method. * Lin Zhang [email protected] 1
College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China
2
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China
The geomechanical model test can visually reflect the deformation characteristics and failure patterns on the dam abutment and foundation under different overload conditions. It can provide the most direct information of displacement, deformation process, and stability of a dam for the designer and engineer. The geomechanical model test ma
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