Stability Analysis of Slope and Diversion Water Tunnel of Hydropower Station under Strong Earthquake
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ORIGINAL PAPER
Stability Analysis of Slope and Diversion Water Tunnel of Hydropower Station under Strong Earthquake Zhongchang Wang . Bo Li
Received: 26 September 2020 / Accepted: 13 October 2020 Ó Springer Nature Switzerland AG 2020
Abstract According to the slippage of the slope under the action of strong earthquakes and the deformation of the lining structure of the diversion water tunnel, the hydropower station under the seismic load with a 100-year probability of exceeding 2% was simulated, and the three-dimensional dynamic finite element method was used to analyze the slope of the powerhouse and the diversion water tunnel, and obtained the stress and displacement laws of the slope and the water diversion tunnel lining structure and the dynamic response characteristics of the tunnel. The results showed that under the influence of ground motions, the slope and the lining structure of the diversion water tunnel would produce similar forced vibrations, and the damage effect at the top of the slope was more obvious than that at the empty face. The dynamic displacement, tensile stress and compressive stress increased with the increase of the peak ground motion. The maximum values of tensile and compressive stress of the tunnel lining structure appeared at the entrance of the upper flat section of the diversion water tunnel, and there would be local tensile stress concentrations at the top, bottom and the middle of the tunnel. Due to the existence of adjacent tunnels, the tensile stress generated by the tunnel lining was asymmetric in the horizontal direction, and the mutual Z. Wang (&) B. Li School of Traffic and Transportation Engineering, Dalian Jiaotong University, Dalian 116028, China e-mail: [email protected]
influence between the two tunnels increased the maximum tensile stress accordingly. Keywords Slope Diversion water tunnel Lining structure Dynamic analysis Dynamic response
1 Introduction During the construction and operation of hydropower stations, strong earthquakes sometimes occurred, which could induce the slippage of powerhouse slopes and the deformation of the lining structure of the diversion water tunnel, and even caused cracks in the lining structure, further affecting the safe production activities of the hydropower station. At present, the main methods for conducting seismic research on underground structures include prototype observation (SL 616-2013 2013), experimental research (Zhang and Tao 2002), theoretical analysis (Liu et al. 2007) and simplified design. The theoretical analysis includes seismic coefficient method (Yang et al. 2017), numerical method (Youssef et al. 2001), and sub-structure method (Li et al. 2010). The numerical method calculates the deformation, stress and strain of the structure at each moment through dynamic response analysis, so as to understand the response characteristics and failure mechanism of slopes and diversion water tunnels under strong earthquakes more comprehensively. Numerical methods for studyin
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