Analysis of seepage and seepage control measures in the rock masses of the Huilong pumped-storage power station

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• 作者：Enzhi Wang ; Jianwen Zhong ; Yiting Zhao…
• 关键词：Fractured rock mass ; Seepage ; Dual fracture system ; Pumped ; storage power station ; Seepage control measures
• 刊名：Bulletin of Engineering Geology and the Environment
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：74
• 期：4
• 页码：1453-1462
• 全文大小：1,086 KB
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• 作者单位：Enzhi Wang (1)
  Jianwen Zhong (1)
  Yiting Zhao (1)
  Wenran Mao (2)
  
  1. State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, 100084, China
  2. Yellow River Engineering Consulting Co., Ltd, Zhengzhou, 450003, Henan, 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

The Huilong pumped-storage power station is located in the Henan Province of China, in which there is an underground power plant with an installed capacity of 120 MW, an upper reservoir with a volume of 1.01 × 106 m3 and an upper dam of 54 m height. The upper reservoir near the local watershed is a small catchment basin with little runoff. The rock masses in the site of the upper reservoir are granite with many faults and numerous fractures, and are strongly weathered near the earth’s surface, which leads to obvious permeability of the rock masses in the directions of depth and level. Due to the heterogeneity as well as anisotropy of permeability of the rock masses, especially the strong permeability of the faults within, the leakage of the reservoir becomes very complex and is a problem concerned with engineering construction. If no impervious system exists, the largest volumetric rate of reservoir leakage is up to 17 × 103 m3/day, but the allowable leakage is only 2.0 × 103 m3/day. So an impervious system should be taken to control the reservoir leakage. Some treatments, e.g., concrete coverage on the bedrock of the reservoir, curtain grouting around the reservoir, grouting along faults within the reservoir, and shotcrete coverage on the bedrock of the reservoir, are considered in the design. If concrete coverage is laid only on the faults and both of their sides to prevent water seepage from flowing directly, the water in reservoir can still flow in the faults indirectly, through the weathering zones of rocks. Although the curtain grouting around the reservoir is a barrier to seepage flow, the leakage can also occur in deep rocks. Finding a more effective and economical seepage control measure system is critical to the reservoir design, and is thus a main goal of this paper. we used numerical simulation with a 3D flow model of a dual fracture system to analyze the patterns of 3D seepage flow in the rock masses according to the geological conditions in the reservoir area. For this purpose, the seepage field and seepage pattern are discussed in detail by comparing the leakage quantities of the four seepage control schemes. The scheme that combines concrete coverage on faults and shotcrete coverage on bedrock is optimal, and is suggested in the Huilong Power Station engineering design . Keywords Fractured rock mass Seepage Dual fracture system Pumped-storage power station Seepage control measures