Abstract
Methods of limiting the mobilization of boundary friction during large-scale laboratory testing of buried pipes (geopipes) are investigated. A small scale investigation using a direct shear apparatus examined the effectiveness of different configurations of unlubricated and lubricated geosynthetic treatments intended to reduce the boundary friction mobilized between a steel–soil interface. Results from direct shear tests indicated that applying a double layer of thin polyethylene sheeting lubricated with silicon grease yielded an angle of friction of about 5°, provided that the interface treatment received adequate protection from the backfill material. Tests conducted in the large-scale test facility suggest that this interface treatment successfully limits boundary effects arising from interface friction.
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