STEP LOAD MOVING WITH LOW SUBSEISMIC VELOCITY ON THE SURFACE OF A HALF-SPACE OF GRANULAR MATERIAL
WEIDLINGER ASSOCIATES NEW YORK
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The plane strain problem of a step load, p, moving on the surface of a half-space of granular material governed by internal friction and cohesion is considered because of its importance to Air Force research in protective construction. As a preliminary step towards a more complete solution, it is assumed that in regions of slip the elastic deformations may be neglected in favor of those resulting from slip. The laer assumption limits the application to Mach numbers of less than about 0.20. Two possible types of behavior of the material are considered. During slip, one material exhibits dilatancy, while the other does not change in volume. A significant finding is that for values of p above a certain limit, granular particles will be expelled at the surface ahead of the pressure front. The applied pulse will be preceded by a precursor of expelled grains.
- Structural Engineering and Building Technology