Abstract
Mechanisms of strength loss of rocks in a slightly fractured mass during confined explosions are considered. It is shown that, at small depth (H ≤ 400m) beyond the boundary of radial crack zone, local rock failure is possible under the action of hoop tensile stresses during a single explosion and under the action of shear stresses in wave superposition zones during a group explosion. At great depths, local failure and strength loss of rocks in the indicated area are possible by shear failure in zones of blast wave interaction.
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