DETERIORATION IN NATURAL ROCKS - PROBLEMS IN ROAD AND TUNNEL CONSTRUCTION

NATUERLICHE GESTEINSVERAENDERUNGEN - PROBLEME BEIM STRASSEN- UND TUNNELBAU

Using as an example the South Motorway in the Pack (Steiermark) area, investigations were carried out to determine what significance mineralogical-petrographical rock transformations (mineral decomposition, mineral transformation and the new formation of minerals) - which influence the preservation conditions of the rock - have on rock strength. It was shown that such transformations can only influence the degree of rock strength if they affect fairly large rock masses to a significant degree. If they are limited to joints and their immediate vicinity, then the quality of the rock does not change significantly. They can however exhibit negative effects if construction works are carried out on the rock should the rock joints have unfavourable bedding characteristics. In open excavations (road cuttings) these effects show as slips on slopes and by collapses in tunnel works. In the sections of construction works investigated the following mineralogical-petrographical changes were established: joints having very fine-grained material worked out of the joint and mylonite, mineral decay and the formation of radioamorphous substances along the fissures and their immediate vicinity and in mylonites, the formation of minerals which swell and sliding at joints or stratification planes and mylonites by the transformation and new formation with differential water ingress. /TRRL/

  • Corporate Authors:

    Springer Verlag

    175 5th Avenue
    New York, NY  United States  10010
  • Authors:
    • Hoeller, H
    • HOMANN, O
    • Kolmer, H
    • Wirsching, U
  • Publication Date: 1977-12

Language

  • German

Media Info

  • Features: References; Tables;
  • Pagination: p. 73-80
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00195171
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Aug 28 1979 12:00AM