Analysis on geological condition of rock mass with Hoek-Brown strength criterion

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Abstract

Most of the numerical analyses currently used for evaluation of the stability of underground excavations are based on a linear Mohr-Coulomb strength criterion. However, experimental data and experience of the field engineering showed that the strength of nearly all types of rock mass followed withthe non-linear Hoek-Brown strength criterion.The Hoek-Brown strength criterion for rock mass is widely accepted and applied in a large numberof engineeringin the world. This paper briefly introduces Mohr-Coulomb strength criterion and Hoek-Brown strength criterion as well as the parameters considered in the two strength criterion. The effects of thegeological condition parameters considered in Hoek-Brown strengthcriterion,disturbed factor D, and intact rock constant mion the rock mass strength are studied. The geological conditions of the rock mass areindicated byvolumetric discontinuity frequencyλv,infilling ratingRf,roughness ratingRr and weathering ratingRwof the discontinuity and represented by the Geological Strength Index(GSI). To embody the advantageof Hoek-Brown strength criterion, a deeply buried tunnel is involved in numerical analysiswith GeoFBA3DV2.0.The numerical result reflects the superiority that Hoek-Brown strength criterion can consider the instant and sectional geological condition with the link of GSI.Tunnel design with Hoek-Brown strength criterion can use the accurate surrounding rock parameters following the tunnel excavation and avoid thewaste of uniformly distributed support structure using global design concept.

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Keywords

  • Geological condition
  • Hoek-Brown criterion
  • Mohr-Coulomb criterion
  • Rock mass

ASJC Scopus subject areas

  • Geology
  • Geophysics
  • Geotechnical Engineering and Engineering Geology

Cite this

Zhang, Q., Huang, X., Zhu, H., & Zhang, L. (2015). Analysis on geological condition of rock mass with Hoek-Brown strength criterion. Paper presented at ISRM VietRock 2015 International Workshop, Hanoi, Viet Nam.