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How much should be dug on both sides of the tunnel to get through one side?
Fifteen meters. The excavation on both sides of the tunnel should be completed from one end to avoid the influence between working faces and safety problems. When the working face spacing is 15m, one side should be completed and the other side should be stopped. Tunnel excavation refers to the tunnel excavation method of once drilling, once blasting and once initial support in place in the whole tunnel excavation section.
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