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兰青线提速改造项目中的新旧虎头崖隧道有 42m长的两线间距仅为 11.4m ,实际围岩厚度为 4.3m。在施工中通过利用微差爆破技术保证了既有线运营安全和新建隧道的施工安全
The new and old Hutatou tunnel in the blue-green line speed-up project has a 42m long two-lane spacing of only 11.4m and an actual surrounding rock thickness of 4.3m. Through the use of millisecond blasting technology in construction to ensure the safety of existing lines and the construction of new tunnel construction safety