RESPONSE OF CLAY TO SHOCK LOADING.
Technical rept. Aug 64-Mar 67,
PURDUE UNIV LAFAYETTE IN SCHOOL OF CIVIL ENGINEERING
Pagination or Media Count:
Axisymmetric, compressional shock waves with initial rise times and peak stresses less than 0.1 millisecond and at least 1,000 psi, respectively, were propagated through a compacted clay soil by detonating an explosive cord along the axis of the sample. Piezoelectric stress gages and spool-type strain gages embedded within the soil measured stress and strain with time and radial distance. Measurements were made in all three principal directions except that strain measurements could not be obtained in the axial direction. Both the incident and peak stress wave velocities were found to be independent of radial distance. The rate of peak stress attenuation was greater than that which could be attributed to geometric attenuation in an elastic medium. Tensile stresses were both observed and computed in the radial, tangential and axial directions. Measured strains in the radial and tangential directions showed a significant time lag between peak stresses and peak strains. Author
- Geology, Geochemistry and Mineralogy
- Fluid Mechanics