The impact of abutment relaxation on stability of underground mine openings

Mark S. Diederichs, Peter K. Kaiser, Fidelius Suorineni

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In contrast to· typical excavations in civil engineering construction, mine openings often create locally reduced c<;mfmement and relaxation or tension in the backs or walls. Boundary-parallel stress reduction, or relaxation, can have devastating consequences in structurally dominant ground or in situations where the ground has been previously damaged by high stress. Such relaxation is often neglected in limit equilibrium calculations and in empirical design techniques. The stability of hangingwalls in open stopes is of particular concern with respect to the detrimental impact of relaxation on both rockmass stability and the capacity of standard cablebolt reinforcement systems. The voussoir analogue for jointed beam stability is used to investigate the impact of stress reduction parallel to the back and walls of underground mine stopes and to provide an relaxation adjustment factor for the empirical "Stability Graph", a technique for design of open stope dimensions and support.

Original languageEnglish
Title of host publication4th North American Rock Mechanics Symposium, NARMS 2000
PublisherAmerican Rock Mechanics Association (ARMA)
Pages481-488
Number of pages8
ISBN (Print)9058091554, 9789058091550
Publication statusPublished - Jan 1 2000
Externally publishedYes
Event4th North American Rock Mechanics Symposium, NARMS 2000 - Seattle, United States
Duration: Jul 31 2000Aug 3 2000

Publication series

Name4th North American Rock Mechanics Symposium, NARMS 2000

Conference

Conference4th North American Rock Mechanics Symposium, NARMS 2000
CountryUnited States
CitySeattle
Period7/31/008/3/00

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

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