TUNNELLING IN ROCK. CHAPTER 4: SITE EXPLORATION IN TUNNELLING PROSPECTS

Chapter 4, which is the first of two dealing with site exploration, outlines the planning of site exploration and describes two types of site investigation: drilling investigation and joint survey. The purpose of a drilling exploration is (1) to confirm the geological interpretations and thus confirm the best route alignment and position of portals; (2) to examine the cores to determine the quality of the rock mass, i.e. homogeneity and fracturing, from which other deductions can be made; (3) to obtain hydrological information; and (4) to obtain cores for rock mechanics testing and petrographic studies. The purpose of a joint survey is to investigate the features of the rock mass, especially the smaller discontinuities such as naturally occurring joints. Data are also collected on foliations, lineations and bedding orientations in order to establish the geological structure of the rock mass. /TRRL/

  • Supplemental Notes:
    • See also HRIS 095929 and 095931 through 095937 for Chapters 3, 5-10 and 14.
  • Corporate Authors:

    South African Institute of Civil Engineers

    2 Hollard Street
    Johannesburg,   South Africa 

    South African Council for Scientific & Indus Res

    P.O. Box 395
    Pretoria, Transvaal,   South Africa 
  • Authors:
    • Mountain, M J
  • Publication Date: 1974-6-1

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00095930
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 15 1975 12:00AM