Analysis on roadway stability in jointed rock mass

Gang Liu, Jian Zhao, Hongwei Song

Research output: Contribution to journalArticleResearchpeer-review

8 Citations (Scopus)

Abstract

By adopting the triaxial plane strain system for roadway model test and the digital photogrammetry for deformation measurement, the mechanism of generation and propagation of broken rock zone and roadway stability in jointed rock mass with different joint angles and joint densities were quantitatively studied in deep stress field. The results show that joint density affects largely the carrying capacity of the rock mass and has full control of the stability of surrounding rock. The amount of deformation and stability performance between jointed rock mass and intact rock are significantly different in same stress field, and intact rock exhibits a small amount deformation and better stability performance. It is not technically necessary to support the roadway because the rock mass is in the elastic and plastic deformation stage before the convergence percent of roadway exceeds 2.46%. When the convergence percent is in the range of 2.46% to 5.00%, the broken rock zone will be generated firstly in surrounding rock and increases rapidly, but there is yet a certain self-stability capacity of surrounding rock. However, artificial stability is obligatory at this time. As long as the convergence percent does not exceed 5.00%, the general supporting method can ensure the roadway stability and it need not to adopt reinforced support. When the convergence percent is more than 5.00%, the broken rock zone would be enlarged slowly, meanwhile rib spalling and roof caving would occur in turn on the roadway. The self-stability capacity of surrounding rock has lost synchronously and the reinforced support must be taken for the roadway stability. If the support is delayed or inappropriate, to maintain the roadway stability will be progressively difficult. If the convergence percent reaches 22.80%, the roadway will be destroyed completely and lose the safety and use function, and ultimately lose the possibility of artificial stability.

Original languageEnglish
Pages (from-to)2910-2918
Number of pages9
JournalJournal of Central South University (Science and Technology)
Volume44
Issue number7
Publication statusPublished - Jul 2013
Externally publishedYes

Keywords

  • Broken rock zone
  • Convergence percent
  • Joint density and angle
  • Model test
  • Roadway stability

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