Rock slope deformation mechanism in the Cihaxia Hydropower Station, Northwest China

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• 作者：Zelin Zhang ; Gao Liu ; Shuren Wu…
• 关键词：Toppling deformation ; Block ; flexural toppling ; Formation mechanism ; Discrete element method ; Universal distinct element code (UDEC) ; Hydropower station
• 刊名：Bulletin of Engineering Geology and the Environment
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：74
• 期：3
• 页码：943-958
• 全文大小：16,361 KB
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• 作者单位：Zelin Zhang (1) (2)
  Gao Liu (3)
  Shuren Wu (1)
  Huiming Tang (2)
  Tao Wang (1)
  Gaoyong Li (3)
  Changyu Liang (1)
  
  1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, China
  2. China University of Geosciences, Wuhan, China
  3. Lanzhou University, Lanzhou, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Applied Geosciences
  Structural Foundations and Hydraulic Engineering
  Geoecology and Natural Processes
  Nature Conservation
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-9537

文摘

Complex block-flexure slope toppling is observed in interbedded sandstone and slate in the upper Yellow River, China. Block toppling is observed in the relatively hard sandstone and flexural toppling is observed in the relatively soft slate. The evolution of toppling slope deformation is characterized by long-term progress and spatial variability. In order to study these characteristics, field investigations, adit prospecting, borehole drilling, sonic tests and numerical simulation were carried out. In addition, the effect of the structure, the composite mode of the rock mass, the unloading fissures and geomorphology are discussed. Furthermore, we explored the toppling mechanisms and simulated it numerically; on this basis, the slope evolution is divided into four stages. Results obtained from the numerical simulation compared well with field investigation data (investigation data, rock sonic survey and strata dip statistics). Comparative studies have demonstrated that the analytical methods presented in this paper are appropriate for back analysis of the toppling evolution process. The result showed that this toppling slope has not yet entered the later progressivity failure stage and is currently limited to collapse at shallow levels, whereas the deep-seated rock mass will remain stable for a long time. This study might provide reference for a stability evaluation and hazard prevention analysis for rock toppling.