EXPERIENCE WITH A NEW HIGH PRESSURE SELF BORING PRESSUREMETER IN WEAK ROCK: PART 2

This paper describes the results of in situ testing of weathered or partially weathered keuper marl with a nearly developed high pressure self boring pressuremeter (rsbp). The first part of the paper was published in ground engineering for August 1988. The new pressuremeter tests were carried out at 4 boreholes at West burton, near East retford, to depths of up to 50 m below ground level, approximately 40 m into the keuper marl. Results are given for: a) in situ total horizontal stress in grades a, b and C material; b) reload shear modulus measured in 3 boreholes; results are given for materials in grades a, b, c and d; C) undrained shear strength, measured in 3 boreholes for grades a, b and c material. Main conclusions are: i) that the rsbp provided data from a site where laboratory tests and pressuremeter tests in pre-formed test pockets were unsatisfactory; II) the rsbp permits assessment or in situ total horizontal stress, which has not been done before in keuper marl; III) the thin stiff membrane facilitates assessment of the response of the rock; and IV) the strengths measured by the new pressuremeter are considerably greater than the undrained shear strength values from laboratory triaxial tests, though they are lower by a factor of 3 than the high pressure dilatometer (hpd) derived values.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00174653
• Corporate Authors:

  Thomas Telford Limited

  London,   United Kingdom 
• Authors:
  • CLARKE, B G
  • Newman, R L
  • Allan, P G
• Publication Date: 1989-9

Language

• English

Media Info

• Pagination: p. 45-52
• Serial:
  • GROUND ENGINEERING
  • Volume: 22
  • Issue Number: 6
  • Publisher: EMAP CONSTRUCT LIMITED
  • ISSN: 0017-4653

Subject/Index Terms

• TRT Terms: Clay; Coefficients; Field tests; Instruments for measuring loads or pressure; Marl; Measurement; Measuring instruments; Pressiometric probes; Rocks; Shear strength; Soils; Stiffness; Stresses; Tests; Weathering
• Uncontrolled Terms: Pressiometer
• ITRD Terms: 6155: Apparatus (measuring); 4177: Clay; 6410: Coefficient; 6226: In situ; 4119: Marl; 6136: Measurement; 6128: Pressiometer; 4154: Rock; 5531: Shear; 4156: Soil; 5931: Stiffness; 5575: Stress (in material); 6255: Test; 5281: Weathering
• Subject Areas: Geotechnology;

Filing Info

• Accession Number: 00498791
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Sep 30 1990 12:00AM