Soil-Air Interactions during Airblast-Induced Ground Motions.
Abstract
Some ground motion records in HE field tests, e.g., MISERS BLUFF II-2 and PRE-MINE THROW IV-6, exhibit an enhanced upward velocity immediately following the initial airblast-induced downward motion. Also, laboratory experiments show the development of upward soil motions during positive air overpressure loadings; the motion in the laboratory tests was shown to be related to the flow of the air through the soil pores. In this report, the effects of pore-air (dry porous soils can have 30-40% of their volume filled with air; this in-situ air is called pore-air and is one important aspect of soil/airblast interactions.) on ground motions in dry porous soils are analyzed using five numerical simulations in one space dimension and time. Also, experimentally observed ground motions involving enhanced vertical velocities are explained using two-phase (soil and air) physics, including (a) the flow of air through the soil pores, and (b) soil fluidization. Fluidization of the soil occurs when the soil particles lose contact with each other and the total pressure is entirely supported by the pore-air.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1982
- Accession Number
- ADA154326
Entities
People
- D. L. Orphal
- M. Rosenblatt
- P. J. Hassig