ENGINEERING GEOLOGY AND SITE INVESTIGATION PART 3: INVESTIGATION METHODS.

Site investigation techniques in routine commercial use in the United Kingdom offering different levels of information at different levels of cost, and with different degrees of site distrubance are discussed. The objects of borehole investigation and trial pit/shaft excavation are set forth, and methods of soil boring and rock drilling are detailed. Shell and auger or percussive rig utilization is the mainstay of British site investigation. Hand augering for shallow investigations in stable unobstructed soils is a valuable low cost approach. Details of mechanical augering are briefly described. Small percussive bored piling rigs used for bored piling in 19 and 21 in. diameters have proved useful in beds of cobble typical of glacial gravels. Dry coring, and the taking of undisturbed soil samples are also detailed. Rock drilling techniques may be one of two types: low-cost non-coring techniques which rely for their usefulness on rapid progress, giving extensive information at a low level; and the slower core drilling. The techniques in most common use are: rotary percussive drilling, rock bit drilling, and full-face diamond drilling. Core drilling details are discussed and the principal variables in core drilling equipment are described. In situ tests are detailed, and permeability, trial excavations, and buried services are outlined. Boring techniques in the U.K. are restricted almost exclusively to shell and auger work. Diamond core drilling accounts for the majority of rock drilling; the tendency has been toward the use of larger diameter and advanced design to achieve maximum core recovery in weaker rocks. A notable development is the use of lightweight core drilling attachments to shell and auger rigs for probing a few meters of rock. With the availability of mechanical equipment, trial pilling and shafts are uncreasingly used, and the electronic detection of buried services has reduced some of the risks.

  • Availability:
  • Corporate Authors:

    Wells (Edward) and Sons, Limited

    143/145 Camberwell New Road
    London SE5,   England 
  • Authors:
    • Wilson, E J
  • Publication Date: 1975-9

Media Info

  • Features: Photos; References; Tables;
  • Pagination: p. 21-28
  • Serial:
    • GROUND ENGINEERING
    • Volume: 8
    • Issue Number: 5
    • Publisher: EMAP CONSTRUCT LIMITED
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00129024
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 10 1976 12:00AM