sound-wall blasting

excavation

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In tunnels and underground excavations: Preserving rock strength
…is the Swedish development of sound-wall blasting (to preserve rock strength), treated below under rock chambers, since its importance increases with size of the opening. The second is the American development of rock moles that cut a smooth surface in the tunnel, thus minimizing rock damage and support needs—here limited…
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In tunnels and underground excavations: Sound-wall blasting
Sound-wall blasting is a technique, primarily developed in Sweden, that preserves the finished rock surfaces in sound condition by careful design of the blasting charges to fit the rock conditions. In underground work, Swedish practice has often produced remarkable results almost like rock…
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