Methods of membrane penetration calibration and some anomalies in these methods are examined, and a modified method to correctly determine the rubber membrane penetration is presented. Two methods of evaluation of membrane penetration are described. In one method, tests are conducted with different size dummy rods placed coaxially inside the specimen. In the second method, it is assumed that a specimen of saturated cohensionless soil under increasing cell pressure and in drained condition, behaves as an isotropic medium. Discrepancies in the methods are discussed and midifications are suggested. Experimental results are presented. It is concluded that in membrane penetration caligration tests using dummy rods, the use of an annular flexible top platen (which gives more reliable results) is preferred to the use of the conventional rigid top platen. It is emphasized that in calibration tests for membrane penetration, the plot should be in terms of the linear relationships between the total volume change and the volume of sand in the annular space, and not between the total volume change and the diameter of the dummy rod.

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  • Accession Number: 00260342
  • Record Type: Publication
  • Report/Paper Numbers: Proc Paper 10454
  • Files: TRIS
  • Created Date: Sep 5 1974 12:00AM