Accession Number : AD0780104

Title :   A Structural Evaluation of Rapid Methods of Backfilling for Bomb Damage Repair.

Descriptive Note : Final rept. Jul 71-Apr 73,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Forrest,James B. ; Shugar,T. A.

Report Date : MAR 1974

Pagination or Media Count : 94

Abstract : The effectiveness of using conventional materials and procedures for backfilling and repairing bomb craters in airfield pavements is evaluated. Candidate backfill systems were analyzed by a finite element computer program with an automatic mesh generation capability. A nonlinear axisymmetric analysis predicts the stresses, strains, and deformations in the repaired crater, which are induced by simulated static aircraft wheel forces. Field tests were also conducted in which scaled models of craters were excavated and backfilled with well-graded and uniformly graded aggregates, densely and loosely placed. Each repaired crater was tested without a capping and with a 6-inch-thick concrete capping under a simulated F-4 wheel load. It was found that coarse, uniformly graded backfill with a capping equivalent in stiffness to 6 inches of portland cement concrete meets the requirements for rapidly repairing bomb craters. If possible, the aggregate should be discharged into the crater from a height of about 5 feet. (Author)

Descriptors :   *Bombs, *Craters, *Backfills, *Landing fields, Bomb damage, Materials, Field tests, Computerized simulation

Subject Categories : Terminal Flight Facilities
      Civil Engineering
      Armor

Distribution Statement : APPROVED FOR PUBLIC RELEASE