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Inelastic Wave Propagation in Highly Porous Media

机译：高孔隙介质中的非弹性波传播

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Chemical explosions with energies between 1.49 and 2361 kJ were used to generate spherical diverging stress waves in pressed soils. Two soils were studied. One was pressed at 4.8 MPa, which resulted in a density of 1.74 Mg/m exp 3 and porosity of 36%, while the other was pressed at 0.7 MPa and had a density of 1.61 Mg/m exp 3 and porosity of 41%. The motion of the wave was measured in the free field using particle-velocity gauges emplaced at several radial distances from the energy source. Near the source the wave propagates as a single shock wave and attenuates very rapidly; proportional to R/sup -2.8/. As the wave continues to propagate, a two-wave structure appears with the precursor amplitude in each soil corresponding closely to the pressure at which the soil was formed. Thus, the precursor amplitude suggests that the threshold for shear failure occurs at about 8.5 and 1.2 MPa in these two materials. At still greater distances a single wave once again propagates but this wave becomes highly dispersive, indicating a strong attenuation of the high frequency components; behavior similar to that expected of a viscoelastic material. 9 refs., 11 figs. (ERA citation 11:009699)

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