I'm trying to work out how much soils in systems like HESCOs respond to blast and absorb energy. Going with this, I'm also trying to estimate how much energy will result in breaching the geotextiles.
Artur's comments about granular flow are correct for low speed applications like stopping a truck, but for blast loading of a geomaterial, the primary mechanism for energy dissipation is the fracture, comminution, and plastic flow of fragments to fill the local pore space during compaction. The textile container around these barriers (or a common sandbag) just serves as a robust container to hold the material in place. In some cases, there may be a pre-stress on the granular material if the casing is elastic, but the pressure from that is so small compared to that of a blast I doubt it's significant.