Behaviour of multi- layered rock masses with weak inclusions

The behaviour of a layered rock mass with weak inclusions is strongly influenced by the presence as well as the characteristics of these inclusions. The deformability of a model rock mass with weak inclusions changed in inverse proportion to the depth of the weak inclusion from the loading surface, as well as with the strength characteristics of the material of the weak inclusion itself and the joint characteristics. The strain- hardening (concave upwards) type of curve which indicates at first sight consolidation does not necessarily indicate increased stability, and this is of great importance for interpreting in-situ conditions. The weak inclusions act as "damping" agents for further vertical deformation or stress. The max. Horizontal deformations could amount to only a small fraction of the max. Vertical ones. The failure pattern of the jointed models cover a wide range including: punching shear, wedge joint openings coupled with punching shear and sinking of strong blocks into the weak inclusion when the inclusion is close to the surface, wedge joint opening with fractures in the strong blocks in the layers overlying the weak inclusion when the inclusion is at same depth from the surface. The bearing capacity of jointed models with weak inclusions varied in direct proportion to the uniaxial strength and modulus of elasticity ratios for the same position of the weak inclusion within the model.

Language

  • English

Media Info

  • Pagination: 201-8
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 01437997
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 9061910730
  • Files: ATRI
  • Created Date: Aug 24 2012 9:19PM