PORE PRESSURE WITHIN SOIL SPECIMENS IN TRIAXIAL COMPRESSION

Pore pressure measurements at the base and within undisturbed specimens of a sensitive clay during consolidation and shear indicate that membrane leakage is not serious for ordinary tests. A technique for measuring pressures within the specimen is described. In the soil tested, greater pore pressures were developed at the lower end of the specimen than in the center and this was attributed to end restraint. Because failure occurs near the bottom of the specimens, the pressure measured at the base plate is considered to be satisfactory for the computation of effective stresses at failure. Discussion: G.E. Blight discusses pore pressure and dilatancy variation within triaxial specimens and demonstrates the infleunce of end restraint on pore pressures. Warner E. Schmid doubts that it is reasonable to assume that pore pressures on the failure plane are almost equal to those measured at the base plate. He finds most of the common shear strength concepts applied to soils to be unacceptable. R.E. Olson conducted extensive tests who's results support the author's observation that leakage through the rubber membrane is not a serious problem for ordinary tests. He also discusses the use of the pore pressure needle.

  • Corporate Authors:

    American Society for Testing and Materials

    100 Barr Harbor Drive, P.O. Box C700
    West Conshohocken, PA  United States  19428-2957
  • Authors:
    • CRAWFORD, C B
  • Publication Date: 1963-9

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 192-211
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00095100
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 7 1975 12:00AM