Safety Threshold Determination for Blasting Vibration of the Lining in Existing Tunnels under Adjacent Tunnel Blasting

<div>Typical lining cracks. (a) Circumferential cracks in the arch crown. (b) Longitudinal cracks in the arch crown. (c) Cracks in the sidewall. (d) Cracks in the spandrel.</div>

Advances in Civil Engineering

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Figure 7

Figure 7: Safety Threshold Determination for Blasting Vibration of the Lining in Existing Tunnels under Adjacent Tunnel Blasting 