THE ENGINEERING-GEOLOGICAL EXPECTATION MODEL AS A BASIS FOR PROGNOSIS IN UNDERGROUND CONSTRUCTION

An engineering-geological expectation model comes into being in the following way: a prerequisite is the comprehension of the specific rock-technological formulation of the problems associated with a particular project (planning model). Then the engineering-geological conditions appropriate to the project must be worked out under consideration of the regional geological conditions (geological-tectonic expectation model). After setting-up of this model and the ensuing delineation of areas of homogeneity the engineering-geological prospection is fixed in accordance with the selected prospecting strategy on the basis of the extent and nature of the methods to be employed (prospecting model), which comprises the quality of execution, the density of the investigation network, the range of the results obtained in relation to the immediate area of validity (measuring and test range) the remoter area of validity (area of reference) and the wider terms of reference. The contents of the rock-technological expectation model (prognosis) are the material (rock and strata) with respect to quantity and quality, its classification and distribution, the constructional parameters, the nature and extent of possible support and safety measures. The prognosis is in each case to be rated as certain, probable, possible or uncertain. The level of prognosis of the rock-technological model depends on the correct delineation of areas of homogeneity, the degree of exploration and cover, the assessment methods and the reliability of the information. Finally any engineering-geological expectation model should be amplified and if necessary revised in accordance with the available knowledge during the progress of construction (engineering-geological analysis model). The employment of the engineer geologist ends with the conclusion of the analysis and the interpretation of the actual condition compared to the predictions. (TRRL)

  • Availability:
  • Corporate Authors:

    Springer Verlag

    175 5th Avenue
    New York, NY  United States  10010
  • Authors:
    • Helfrich, H K
  • Publication Date: 1978-10

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 13-26
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00309805
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • ISBN: 3-211-81498-1
  • Report/Paper Numbers: Supplement
  • Files: ITRD, TRIS
  • Created Date: Jun 26 1980 12:00AM