Geomechanics and Engineering

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Design and construction of shaft for rock caverns in Singapore

  • Zhang, Xiao-Ping (The Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, School of Civil Engineering, Wuhan University) ;
  • Lu, Ming (SINTEF Rock Engineering) ;
  • Mao, Dawei (Hydro China Zhongnan Engineering Corporation) ;
  • Zhao, Zhiye (School of Civil and Environmental Engineering, Nanyang Technological University) ;
  • Hao, Liu (China Railway Siyuan Survey and Design Group Co., Ltd)
  • Received : 2014.12.15
  • Accepted : 2017.03.04
  • Published : 2017.07.25
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Abstract

Access shaft is of critical importance to the construction and operation of underground rock caverns. It usually has a relatively large cross-section and penetrates through fill materials, soil layers, and weathered rocks before reaching the caverns excavated in solid bedrock. In this paper, the design and construction of vertical shafts are reviewed in terms of diameter, depth, geological conditions, and support structure. Three shaft alternatives, namely alternative I: vertical shaft with spiral roads, alternative II: upper shaft with spiral roads & lower tunnels, alternative III: plain shaft, are proposed based on a simplified geological profile of the Jurong formation, Singapore. The advantages and limitations of the three types of shafts are discussed. The key issues relating to shaft design and construction, such as the shaft sinking, water control, support structure, are also discussed with a series of solutions provided, such as the sequential excavation, pre-grouting and diaphragm walls.

Keywords

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