RESPONSE OF A BURIED PROTOTYPE COMMUNICATIONS CONDUIT TO STATIC AND DYNAMIC LOADING.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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The objectives of the study were to determine the response of a buried prototype communications conduit in two types of soil media when subjected to either static or dynamic plane-wave surface overpressures, and to evaluate the ability of the conduit to withstand a nuclear blast overpressure of 1,000 psi. Static and dynamic tests were conducted on sections of 4-inch- diameter, 116-inch-thick, steel conduit in the Small 4-foot-diameter Blast Load Generator. The test sections were buried at depths of 2, 4, and 16 inches in a dense, dry sand and at 8 inches in a stiff clay. Measurements were made of strain in the cylindrical sections and the surface overpressure. The conduit buried in sand was subjected to 466-psi static overpressure and 295-psi dynamic overpressure without significant yielding at a fiber and without structural failure. In stiff clay, collapse of the conduits occurred under 348- and 420- psi static loading, respectively, in two tests. The hydrostatic buckling equation underestimated the failure overpressure determined from the tests of conduits buried in clay. It appears that the conduit buried at depths greater than three times its diameter in a material approximating a dense, dry sand should be able to withstand, conservatively, dynamic surface overpressures of 1, 000 psi. Author
- Pumps, Filters, Pipes, Tubing, Fittings and Valves
- Non-Radio Communications