Tunnel face cracking: Imagine excavating a shallow rock tunnel in weathered limestone. Initial elastic stresses concentrate at the tunnel crown. Introducing a small, oriented Crack element at the crown in RS2 can show how, under in-situ stress and excavation-induced unloading, the crack tip opens and extends along a preferential plane. The simulation reveals the sequence: tensile opening, local stress relief, and then shear sliding along the newly formed crack, suggesting where rockbolts or a lining must be installed.
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