Accession Number : AD0714982

Title :   The Behavior of Sands Under Seismic Loading Conditions,

Corporate Author : CALIFORNIA UNIV BERKELEY EARTHQUAKE ENGINEERING RESEARCH CENTER

Personal Author(s) : Silver,Marshall L. ; Seed,H. Bolton

Report Date : DEC 1969

Pagination or Media Count : 146

Abstract : The volume change characteristics and the dynamic stress-strain properties of dry sand subjected to cyclic shear strains have been investigated and used to check the applicability of a simple method for predicting the vertical settlements due to compaction in layers of dry cohesionless soils subjected to seismic loading conditions. Dynamic testing of a medium quartz sand, performed by repeated load simple shear equipment, indicated that the shear modulus increased slightly with increasing numbers of cycles and with increasing relative density and decreases significantly with increasing values of shear strain amplitude. Modulus values determined near the upper limit of shear strain amplitude that might be expected to be induced by seismic shaking (0.1 percent) were as much as 40 percent lower than modulus values obtained at the lowest values of shear strain that were investigated (0.01 percent). (Author)

Descriptors :   (*SAND, SOIL MECHANICS), (*CRATERING, EXPLOSION EFFECTS), SHEAR STRESSES, STRAIN(MECHANICS), TERRAIN, MOTION, DEFORMATION, PRESSURE, SAMPLING, VIBRATION, STABILIZATION, DAMPING, TESTS

Subject Categories : Soil Mechanics
      Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE