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New Austrian Tunneling Method tunnel reinforcement method using pilot tunnel
New Austrian Tunneling Method tunnel reinforcement method using pilot tunnel
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机译：新奥地利隧道法采用先导隧道隧道增强法
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摘要
In the present invention, two-stage drilling is performed in the pilot tunnel, but the first expansion excavation range is limited to a large diameter, and the second reinforcement range is limited to a small-diameter drilling range, and a rock bolt is installed at the interface between the large-diameter hole and the small-diameter hole. It relates to a method for reinforcing a natum tunnel line using a pilot tunnel, which consists of pre-strengthening a section with poor rock quality before expansion blasting by fastening a via ring plate.
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