Pore Air Pressure in Soil Subjected to Shock Waves

by Delon Hampton,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1965, Vol. 91, Issue 6, Pg. 41-56

Document Type: Journal Paper


The propagation of pore air pressure in specimens of soil subjected to a shock wave was investigated. The soils were uniformly graded pea gravel, standard 20-30 Ottawa sand, and well-graded silty sand. The orientation of the shock wave to the soil sample was side-on, and the range in nominal incident overpressure investigated was 25 psi to 100 psi. The principal factors determining the magnitude of the pore air pressure and its penetration for a given overpressure were found to be (1) peak overpressure, (2) soil permeability, and (3) shock shape. It was found that approximately 8 ft of pea gravel or 5 ft of Ottawa sand (average void ratios of 0.05 and 0.45, respectively) would be required to reduce a maximum incident overpressure of 100 psi to zero. Six inches of wellgraded silty sand (void ratio 0.75) were required to produce the same results. The rate of attenuation of pore air pressure with penetration was found, as a first approximation, to be independent of overpressure.

Subject Headings: Wave pressure | Soil pressure | Sandy soils | Pore pressure | Soil gas | Shock waves | Gravels | Silt

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