THE RESPONSE OF BURIED CYLINDERS TO QUASI-STATIC OVERPRESSURES
NEW MEXICO UNIV ALBUQUERQUE
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An experimental investigation was conducted into the response of small buried aluminum cylinders to quasistatic overpressures. The cylinders were buried with their axes horizontal in dense, dry, 20-30 Ottawa sand. Cylinders of two stiffnesses were tested at depths ranging from zero to two cylinder diameters. Their behavior was evaluated quantitatively by radial displacement gages and tangential strain gages. Data at five overpressure levels up to 140 psi are presented. This maximum value exceeded the theoretical in-air primary buckling pressure of the cylinders by factors of 9.4 and 99. Destructive tests were conducted on noninstrumented cylinders of six stiffnesses. This maximum applied overpressure was 160 psi, 470 times the theoretical in-air primary buckling pressure of the most flexible cylinder. The overpressure required to cause collapse of the various cylinders was determined for as many depths of burial as the maximum overpressure would allow. The destructive tests demonstrate the great resistance to collapse imparted to a cylinder by burial. The nondestructive tests afford a comparison between the behavior of stiff and flexible cylinders as the depth of burial and the overpressure are changed. Two zones of burial, deep and shallow, are defined.