THE RESPONSE OF BURIED CYLINDERS TO QUASI-STATIC OVERPRESSURES

An experimental investigation was conducted into the small buried aluminum cylinders to quasi-static overpressures. The cylinders were 4 inches in diameter and buried with their axes horizontal in dense, dry, 20-30 Ottawa sand. Cylinders of two wall thickness (t=0.035 inch, d/t=114; and t=0.016 inch, d/t= 250) were tested at depths ranging from zero to two cylinder diameters. Their behavior was evaluated quantitatively by means of radial displacement gauges and tangential strain gauges. Data corresponding to 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 non-instrumented cylinders of six stiffnesses. The maximum applied over-pressure was 160 psi (470 times the theoretical in-air primary buckling pressure of the most flexible cylinder). The over-pressure required to cause collapse of the various cylinders was determined for as many depths of burial as the maximum overpressure would allow. The destructive test data demonstrate the great resistance to collapse imparted to a cylinder by burial. The non-destructive test data afford a comparison between the behavior of a relatively stiff and a relatively flexible cylinder as the depth of burial and the overpressure are changed. Two zones of burial (deep and shallow), based on the behavior of the cylinders, are defined. These zones depend on the rigidity of the cylinder and the magnitude of the overpressure.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 449-463

Subject/Index Terms

Filing Info

  • Accession Number: 00263718
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 19 1974 12:00AM