Effect of rock mass and discontinuity mechanical properties and delayed rock supporting on tunnel stability in an underground mine

Yan Xing, Pinnaduwa Kulatilake, L. A. Sandbak

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In this paper, the rock mass stability around the tunnels in an underground mine is investigated using the distinct element method. A three-dimensional model was developed based on the available geological, geotechnical, and mine construction information. It incorporates the inclined lithologies including a weak interlayer, the persistent and non-persistent faults, and a complex tunnel system. The strain softening constitutive model was prescribed for the rock masses in the numerical model. The continuously yielding joint model was used to describe the non-linear behavior of the faults. To account for the deformations occurred between the excavations and rock supporting, the delayed installation of supports was implemented by using the stress relaxation method. Numerical analyses were performed to study the effects of the post-failure constitutive parameters of the rock masses, the mechanical properties of faults and the delayed supporting on tunnel stability. The following results are presented: (a) the rock mass deformations and failure zones around the excavations, (b) the joint shear displacements of the major fault, and (c) the failure conditions of the applied supports. Satisfactory comparisons are obtained between the predictions based on numerical modeling and the field deformation measurements. The analysis procedures presented in this study are applicable for stability assessment of various underground rock excavation projects located in different parts of the world having different geological settings and complex engineering situations.

Original languageEnglish (US)
Pages (from-to)62-75
Number of pages14
JournalEngineering Geology
Volume238
DOIs
StatePublished - May 2 2018

Fingerprint

mechanical property
Tunnels
discontinuity
tunnel
Rocks
Mechanical properties
Excavation
rock
excavation
distinct element method
Lithology
Stress relaxation
Constitutive models
softening
effect
Numerical models
lithology
engineering
prediction
modeling

Keywords

  • Continuously yielding model
  • Delayed rock supporting
  • Strain softening
  • Three-dimensional modeling
  • Tunnel stability
  • Underground mine

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

Cite this

Effect of rock mass and discontinuity mechanical properties and delayed rock supporting on tunnel stability in an underground mine. / Xing, Yan; Kulatilake, Pinnaduwa; Sandbak, L. A.

In: Engineering Geology, Vol. 238, 02.05.2018, p. 62-75.

Research output: Contribution to journalArticle

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