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Geomechanics and Engineering
  Volume 17, Number 6, April30 2019 , pages 573-581

Design of initial support required for excavation of underground cavern and shaft from numerical analysis
Joung Oh, Taehyun Moon, Ismet Canbulat and Joon-Shik Moon

    Excavation of underground cavern and shaft was proposed for the construction of a ventilation facility in an urban area. A shaft connects the street-level air plenum to an underground cavern, which extends down approximately 46 m below the street surface. At the project site, the rock mass was relatively strong and well-defined joint sets were present. A kinematic block stability analysis was first performed to estimate the required reinforcement system. Then a 3-D discontinuum numerical analysis was conducted to evaluate the capacity of the initial support and the overall stability of the required excavation, followed by a 3-D continuum numerical analysis to complement the calculated result. This paper illustrates the application of detailed numerical analyses to the design of the required initial support system for the stability of underground hard rock mining at a relatively shallow depth.
Key Words
    underground cavern; kinematic block stability; 3-D discontinuum numerical analysis; 3-D continuum numerical analysis; hard rock mining
Joung Oh and Ismet Canbulat: School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW 2052, Australia

Taehyun Moon: Geotechnical and Tunneling Division, HNTB, Empire State Building 57th FL, New York, NY 10119, U.S.A.

Joon-Shik Moon: Department of Civil Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Republic of Korea

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