THE PLANNING OF GEOTECHNICAL INVESTIGATIONS FOR HIGHWAY SCHEMES. SINO-BRITISH HIGHWAYS AND URBAN TRAFFIC CONFERENCE. PAPERS PRESENTED AT THE CONFERENCE HELD IN BEIJING 17TH-22ND NOVEMBER 1986

The purpose of a geotechnical investigation is to provide data necessary for the design of a highway; in the United Kingdom, this work is typically carried out by civil engineers specialising in geotechnical work. The results of the investigation are conveyed to the highway engineer in the form of a report describing a 'ground model', which is a conceptual model of the natural ground conditions and specifies those parameters that the highway engineer needs to complete the road design. This paper describes how the ground model is derived from the geotechnical investigations; the nature of the model depends on the extent of the investigation. This process is a practical example of bayesian decision theory, applied to an uncertain situation; the ultimate decision required is the conceptual ground model. In developing this model, it is essential that the investigating engineer knows the consequences of his decision; Bayes theorem is used to update his assessment of the likelihood of a specific ground model, and an illustrative example of this process is given. The site investigation procedure includes: (1) preliminary desk study; (2) reconnaissance survey; (3) preliminary geotechnical report; (4) site investigation works; (5) final geotechnical report. For an efficient and reliable investigation, it is essential to use the available geological and allied data for the project area. The ideas described in the paper have led to a well established site investigation procedure, which uses all the relevant information logically and consistently. (TRRL)

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  • Corporate Authors:

    INSTITUTION OF HIGHWAYS & TRANSPORTATION

    6 ENDSLEIGH STREET
    LONDON,   United Kingdom  WC1H 0DZ
  • Authors:
    • Morrison, I M
  • Publication Date: 1986

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Filing Info

  • Accession Number: 00493128
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: May 31 1990 12:00AM