›› 2013, Vol. 34 ›› Issue (S2): 356-362.

• Geotechnical Engineering • Previous Articles     Next Articles

Optimization scheme of three-dimensional excavation of high ground stress soft rock section of Danba hydropower station diversion tunnel

CAI Jian1,2，LIU Jie1   

  1. 1. Key Laboratory of Geological Hazards on Three Gorges Reservoir of Ministry of Education, Chine Three Gorges University, Yichang Hubei 443002, China; 2. Hubei Provincial Water Resources and Hydropower Planning Survey and Design Institute, Wuhan 430064, China
  • Received:2013-04-30 Online:2013-11-11 Published:2013-11-19

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Abstract: A large three-dimensional model of double hole four dimensional Danba hydropower station diversion tunnel excavation is established, and rock mechanics are calculated by using the Mohr-Coulomb model finite element analysis method and unloading rock mass theory and method, and the effect of stress on tunnel is considered to excavate in different depths of tunnel face, from the hole to a certain depth. The displacement changes of tunnel faces at different key points at each excavation are counted. In comparison, the depth of the best tunnel face propulsion should be selected. Under the propulsion depth, the amount of reserved displacements at different segments and locations of holes is counted to provide data support of necessity of advanced support so as to ensure the construction process successfully. It provides references for other similar engineering design.

Key words: diversion tunnel, unloading rock mass theory, Mohr-Coulomb, three-dimensional excavation of tunnel, amount of reserved displacement

CLC Number: 

  • TV 732
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