| 摘要 |
The tunnel excavation method reduces noise and vibration by perforating a long and large sized hole by use of a horizontal hole perforator, and repeating an explosion stroke by stroke. The method comprises the steps of : perforating one or more long holes(1) to the length of at least 6m, a cross section area of at least 0.05 m2, and a diameter of 250 - 1000 mm by using a truck(3a), a crane(3b) and a horizontal perforator(3c); perforating a hole(2), for laying an explosive, around a 1st minimum resistance line(W1); blasting the explosive stroke by stroke; perforating again the hole(2) around a 2nd minimum resistance line(W2) wider than the 1st resistance line(W1); blasting the explosive.
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