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- W205123510 abstract "This discussion is concerned with the physical phenomena in the fracture process of presplitting and only indirectly with the establishment of the optimum presplitting parameters. Its nature is qualitative, rather than quantitative. The phenomena which occur when an explosive charge is detonated in the borehole are examined. The main role of the stress wave is to generate a densely radially fractured zone around the borehole. The subsequent gas pressure, exerted against the walls of a highly (radially) fractured cavity, generates a quasi-static stress field. This stress field was found to be the same as that of a pressurized cylindrical ''equivalent cavity'' with a radius equal to that of the crack tips. Under these conditions, the quasi-static stresses become appreciable and cause further extension of the radial cracks. It was found that under gas pressure, the longest of the radial cracks would extend first, and extension of 2 diametrically opposed radial cracks requires the least pressure. From these observations concerning the single shot, the transition to a whole series of more or less simultaneous shots, as in presplitting, can readily be made." @default.
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- W205123510 date "1967-01-01" @default.
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- W205123510 title "The Roles of Stress Wave And Gas Pressure In Presplitting" @default.
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