PORE-PRESSURE RESPONSE IN ROCK TO UNDRAINED CHANGE IN ALL-ROUND STRESS

Pore-water pressure response in saturated intact specimens of berea sandstone, Salem limestone, Vermont marble and Barre granite to undrained increase in all-round stress, was measured in a specially designed triaxial cell. Dense intact rock specimens exhibited values of SKempton's b coefficient near at small effective all-round stresses, However, as effective stress increased, b coefficient rapidly decreased. Based on the measurements, corrected for the compressibility of the pore-pressure measuring system, the values of b at effective stress of 1600 lb/sq.in were in the range of 0.33-0.69. The rapid decrease in pore-pressure response at the effective all-round stress range of 0-500 lb/sq.in is attributed to closure of crack-type pores and the corresponding decrease in compressibility of the rock skeleton. It is concluded that bishop's expression for the B coefficient with appropriate values of the compressibility of the rock skeleton can predict the pore-pressure response in rocks with interconnecting pores. The major problem in computation lies with the proper choice of values for the compressibility of the rock skeleton. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00168505
• Corporate Authors:

  Institution of Civil Engineers

  One Great George Street, Westminster
  London,   United Kingdom  SW1P 3AA
• Authors:
  • Mesri, G
  • Adachi, K
  • Ullrich, C R
• Publication Date: 1976-6

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 317-330
• Serial:
  • GEOTECHNIQUE
  • Volume: 26
  • Issue Number: 2
  • Publisher: Thomas Telford Limited
  • ISSN: 0016-8505

Subject/Index Terms

• TRT Terms: Compressibility; Granite; Limestone; Marble; Mathematical models; Measurement; Measuring instruments; Pore pressure; Pore water pressures; Rocks; Sandstones; Stresses; Triaxial shear tests; Water pressure
• Old TRIS Terms: Apparatus measuring
• ITRD Terms: 6155: Apparatus (measuring); 5905: Compressibility; 4101: Granite; 4131: Limestone; 6473: Mathematical model; 6136: Measurement; 5762: Pore water pressure; 4154: Rock; 4104: Sandstone; 5575: Stress (in material); 5566: Triaxial
• Subject Areas: Geotechnology; Highways; I43: Rock Mechanics;

Filing Info

• Accession Number: 00142441
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Jul 19 1977 12:00AM