Director of geotechnical laboratories, Geotechnical Engineers, Inc., Houston, Tex.
Professor and chairmanMember of ASTM, Louisiana State University, Baton Rouge, La.
A preliminary investigation into the use of clam shells as a filter material indicates that it may be inappropriate to use the falling-head permeability test to determine the permeability of this material. Where filters were used a reduction of permeability was observed as a result of clogging. Permeability increased when filters were removed from the test setup, even though there was a gradual increase of the finer particles of shell at the discharge end of the specimen. This behavior suggests the importance of proper modeling of actual field conditions where clam shells are incorporated in the design of a structure.
Paper ID: GTJ10437J