Theory and Technology of Rock Excavation for Civil Engineering by Dingxiang Zou

Author:Dingxiang Zou
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

When the charges of two adjacent holes are fired simultaneously, the strain waves generated by the two charges collide in the central point between the two holes creating the effect of superposition (Fig. 10.3). The complementary tangential tensile components of the strain waves, if they exceed the dynamic tensile breaking strength of the rock, produce a new crack and favor the propagation of the radial crack in the designed direction of the cut face.

Fig. 10.3Double tensile stresses generated by the collision of the strain waves produced by the simultaneous detonation of two adjacent charges

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