The spatial and temporal distribution of pressureudand impulse from explosives buried in saturatedudcohesive and cohesionless soils has been measured experimentallyudfor the first time. Ten experiments haveudbeen conducted at quarter-scale, where localised pressureudloading was measured using an array of 17 Hopkinsonudpressure bars. The blast pressure measurementsudare used in conjunction with high-speed video filmedudat 100,000 fps to investigate in detail the physical processesudoccurring at the loaded face. Two coarse cohesionlessudsoils and one fine cohesive soil were tested: a relativelyuduniform sand, a well-graded sandy-gravel, anduda fine-grained clay. The results show that there is audsingle fundamental loading mechanism when explosivesudare detonated in saturated soil, invariant of particle sizeudand soil cohesion. It is also shown that variability in localisedudloading is intrinsically linked to the particle sizeuddistribution of the surrounding soil.
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