Accession Number : AD0682937

Title :   DYNAMIC PORE PRESSURE PROPAGATION IN SAND.

Descriptive Note : Final rept. Jan 66-Dec 67,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : True,Daniel G.

Report Date : JAN 1969

Pagination or Media Count : 49

Abstract : A study was made of pore pressure in sand subjected to a blast overpressure. Results indicated that the lower the permeability of the soil and the shorter the duration of the positive phase of load, the greater the attenuation of the pore pressure at depth. Results also indicated that the attenuation of the pore pressure at depth is not significantly affected by the magnitude of the overpressure. The influence of moisture content on attenuation was not consistent in the experiment. An attenuation relationship has been developed to represent the experimental results and similar data from other sources. Velocity of pore pressure propagation was found to increase with increasing permeability, decreasing duration of overpressure, and increasing degree of saturation. It was not significantly affected by the magnitude of the overpressure. (Author)

Descriptors :   (*UNDERGROUND STRUCTURES, NUCLEAR EXPLOSIONS), (*SAND, LOADS(FORCES)), BLAST, SOIL MECHANICS, POROSITY, PRESSURE, PROPAGATION, SURFACE BURST, STRESSES, ATTENUATION, PARTICLE SIZE, SEMIPERMEABILITY

Subject Categories : Soil Mechanics
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE