Pore-Pressure Response in Rock to Undrained Change in All-Round Stress

G. Mesri, K. Adachi, C. R. Ullrich

Research output: Contribution to journalArticlepeer-review


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 one 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/in2. were in the range of 0·33-0·69. The rapid decrease in porepressure response at the effective all-round stress range of 0-500 lb/in2 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.

Original languageEnglish (US)
Pages (from-to)317-330
Number of pages14
Issue number2
StatePublished - Sep 1 1976

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)


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