IN-SITU TESTING FOR THE CHANNEL TUNNEL

IN-SITU TESTING CARRIED OUT DURING THE SITE INVESTIGATIONS FOR THE CHANNEL TUNNEL IN 1964/65 IS DESCRIBED. THE OBSERVATIONS FALL INTO TWO GROUPS: LOGGING TESTS, CHIEFLY ELECTRICAL, SONIC, AND RADIOMETRIC LOGS; AND PERMEABILITY TESTING, RESPECTING WHICH THE RESULTS OF PUMPING-IN AND PUMPING-OUT TESTS ARE COMPARED. THE VALUE OF IN-SITU TESTING IN CHALK IS CONSIDERED: THE GENERAL VALIDITY OF PERMEABILITY TESTING IS ESTABLISHED, BUT, OTHER IN-SITU TESTS APPEAR CAPABLE OF ONLY QUALITATIVE INTERPRETATION, AND THE TECHNIQUES HAVE NOT YET REACHED A STAGE WHERE THE ENGINEERING PROPERTIES OF CHALK CAN BE DIRECTLY ASSESSED FROM IN-SITU TESTS. NEVERTHELESS, THE BOREHOLE LOGS REVEAL A CHARACTERISTIC PATTERN CONTROLLED BY THE VARIATION OF PHYSICAL PROPERTIES WITH DEPTH. GEOPHYSICAL LOGGING CAN HELP IN INDICATING ABRUPT CHANGES, ABNORMAL CONDITIONS, OR LOCATIONS WHERE ADDITIONAL GEOTECHNICAL TESTING MAY BE DESIRABLE. /RRL(A)/

  • Supplemental Notes:
    • pp 109-134, 15 FIG, 1 TAB, 2 PHOT, 11 REF
  • Corporate Authors:

    British Geotechnical Society

    ,    
  • Authors:
    • Wood, A M
    • Muir
    • Caste, G
  • Publication Date: 1970

Subject/Index Terms

Filing Info

  • Accession Number: 00234969
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Jul 12 1971 12:00AM