The article presents the first part of the 14th Sir Julius Wernher Memorial Lecture Which discusses the behaviour of rock in relation to tunnelling and mining activities. Rock behaviour is dominated by discontinuities represented as joints. As the stress pattern in jointed rock is changed as a result of excavation so deformation will be determined initially by shearing movements at the joints. As shear stresses increase new discontinuities develop and deformation is less controlled by the initial jointing pattern. It is important to determine whether the problem is one of maintaining stability with the pre-existing jointing pattern or whether it is a problem of yielding rock mass. A factor in determining soil or rock behaviour is that of the "competance" factor defined as the ratio of unconfined compressive strength under uniaxial load to effective pressure of the overburden at the tunnel level. /TRRL/

  • Availability:
  • Corporate Authors:

    Morgan-Grampian Limited

    30 Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • Muirsen, WDA
  • Publication Date: 1979-5

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 43-48
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00300123
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Dec 19 1979 12:00AM