Effect of Tunnel Shape and Support System on Stability of a Tunnel in a Deep Coal Mine in China

Zhengxing Yu, Pinnaduwa H.S.W. Kulatilake, Fuxing Jiang

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Stability level of tunnels that exist in an underground mine has a great influence on the safety, production and economic performance of the mine. Ensuring of stability for soft-rock tunnels is an important task for deep coal mines located in high in situ stress conditions. The aim of this study is to investigate the effect of tunnel shape and support pattern on the deformation, failure zone and stability around a tunnel located in a coal rock mass in China and to select an appropriate tunnel shape and a support pattern to provide a stable stress-deformation condition around the tunnel. Using the available information on stratigraphy, geological structures, in situ stress measurements and geo-mechanical properties of intact rock and discontinuity interfaces, a three-dimensional numerical model was built using the FLAC software to simulate the stress conditions around the tunnel in the coal rock mass. Analyses were conducted for several tunnel shapes and rock support patterns. Results obtained for the distribution of failed zones, and stress and displacement fields around the tunnel were compared to select the best tunnel shape and support pattern to achieve the optimum stability conditions. Also, a comparison is given between the numerical predictions and field deformation monitoring results.

Original languageEnglish (US)
Pages (from-to)383-394
Number of pages12
JournalGeotechnical and Geological Engineering
Volume30
Issue number2
DOIs
StatePublished - Apr 1 2012

Keywords

  • FLAC
  • High in situ stress
  • Numerical simulation
  • Rock support
  • Soft-rock tunnel
  • Stability

ASJC Scopus subject areas

  • Architecture
  • Geotechnical Engineering and Engineering Geology
  • Soil Science
  • Geology

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