Rock mass assessment and corresponding TBM operation optimization for TBM tunneling at depth - A case study of jinping II hydropower station

Jian Lin Yin, Q. M. Gong, J. Zhao

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

1 Citation (Scopus)


During TBM tunneling at the great depth, problems such as high in situ stress, groundwater inflow and fractured rock masses are main reasons of the geotechnical risk occurrence in TBM tunneling. Thus it is necessary to modify TBM and optimize TBM operation parameters for improving TBM performance when encountering these adverse geological conditions. In china, two of four headrace tunnels in Jinping II hydropower station project are constructed by two tunnel boring machines. The headrace tunnels are approximately 16.7 km in length and the maximum overburden depth is up to 2,525m. In this paper, the rock masses along the headrace tunnels of Jinping II hydropower station are assessed, and then are classified into three typical excavation sections according to the main controlling factors of TBM excavation. The three typical excavation sections are the normal excavation section, the excavation section controlled by high in situ stress and the excavation section controlled by large groundwater inflow, respectively. In order to overcome the adverse geological conditions in these typical exaction sections, the corresponding modifications and operation optimization for TBM are proposed in this paper. The experiences obtained from Jinping II hydropower station can provide useful reference and guidance for TBM tunneling at depth.

Original languageEnglish
Title of host publicationUnderground - The Way to the Future: Proceedings of the World Tunnel Congress, WTC 2013
PublisherCRC Press
Number of pages8
ISBN (Print)9781138000940
Publication statusPublished - 2013
Externally publishedYes
EventWorld Tunnel Congress (WTC) / General Assembly of the International-Tunnelling-and-Underground-Space-Association (ITA) 2013: Underground - The Way to the Future - Geneva, Switzerland
Duration: 31 May 20137 Jun 2013
Conference number: 39th


ConferenceWorld Tunnel Congress (WTC) / General Assembly of the International-Tunnelling-and-Underground-Space-Association (ITA) 2013
Abbreviated titleWTC 2013
Internet address

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