Accession Number : AD0674070

Title :   PULSE PROPAGATION IN A PORO-ELASTIC SOLID.

Descriptive Note : Rept. for Jun 66-Dec 67,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Jones,John P.

Report Date : JUN 1968

Pagination or Media Count : 16

Abstract : The problem of a stress pulse applied to a semi-infinite region of a poro-elastic medium is examined to determine the effect of a stress pulse on equipment located underground. If dissipation is neglected, an applied step pulse splits into two pulses that propagate unchanged in shape, each moving at one of the dilatational speeds of the medium. If dissipation is included, the step pulse splits into a 'smeared out' component and a component that retains the sharp front. The latter component travels at a speed that would occur if the fluid and solid were locked together. It is concluded that linear poro-elastic dissipative mechanisms are insufficient in themselves to yield a substantial reduction in accelerations for equipment buried in a saturated soil. (Author)

Descriptors :   (*UNDERGROUND STRUCTURES, SHOCK WAVES), PROPAGATION, ELASTIC PROPERTIES, SOLIDS, STRESSES, BOUNDARY VALUE PROBLEMS, EQUATIONS OF MOTION

Subject Categories : Structural Engineering and Building Technology
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE