Published Online: 16 July 2014
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The Roscoe dummy-rod method was employed to determine the influence of membrane penetration over a large pressure range for Cambria sand. Specimens with three different initial relative densities were subjected to increasing isotropic confining pressures, up to a maximum stress of 60 MPa. A relationship between effective confining pressure and volume change due to membrane penetration was established. Results indicate that above a confining pressure of approximately 8 MPa, membrane penetration decreases with increasing confining pressure. This is believed to be a function of particle crushing. It was also found that over a large pressure range initial relative density influences the degree of membrane penetration.
Bopp, Paul A.
Principal geotechnical engineer, Silverado Construction, Irvine, CA
Lade, Poul V.
Professor, Department of Civil Engineering, The Johns Hopkins University, Baltimore, MD
Stock #: GTJ19970002