SW--Soil and Water: Mechanical Properties of Soils under Explosive Loading

A series of stress histories were detected successfully by plate explosive impact, using piezoelectric crystal gauges pre-positioned at different depths of clayey and sandy soils. The soil dynamic constitutive relation was obtained from the measured stress histories, by fitting a stress-depth-time surface. Results showed that the stress-strain curves had obvious stagnant-return phenomena, strain rate effect and waveform dissipation. These properties are important for correct evaluation of the dynamic behaviour of soils. Different deformation characteristics of soils were found at different depths. The surface layer displayed fluid elastoplastic property, while the middle and deeper layer displayed viscoplastic and elastic properties, respectively.