Pressure Pulse Moving with Constant Velocity on the Surface of a Layered Material (Locking-Elastic Layer-Subseismic Half-Space)

The response of a layered half-space to a progressing normal surface pressure is evaluated. The half-space consists of a single layer of a locking material that acts elastically after compaction, and an underlying elastic material. The surface pressure moves with a constant velocity V, which is subs...

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Bibliographic Details
Main Authors: Bertrand, Guy, Baron, Melvin L, Bleich, Hans H
Format: Report
Language:English
Subjects:
BLAST
DETONATION WAVES
ELASTIC PROPERTIES
EXPLOSION EFFECTS
MATHEMATICAL ANALYSIS
MECHANICAL WAVES
MOTION
NUCLEAR EXPLOSIONS
PROPAGATION
Radiofrequency Wave Propagation
TERRAIN
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Summary:The response of a layered half-space to a progressing normal surface pressure is evaluated. The half-space consists of a single layer of a locking material that acts elastically after compaction, and an underlying elastic material. The surface pressure moves with a constant velocity V, which is subseismic with respect to the speed of wave propagation in both the upper layer after compaction and the underlying half-space. It is assumed that a steady- state exists with respect to a coordinate axis attached to the moving load. The essentially subseismic layer--subseismic half-space geometry leads to an elliptic problem that is solved by a finite difference iterative technique. A computer program for evaluating stresses and velocities at points in the medium is available and results are presented for a typical configuration of interest.