湖北在建最长公路隧道建设取得新进展|无套进入无套内谢
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中新网宜昌10月30日电 (郭晓莹 陈海鹏)记者30日从中铁隧道局集团有限公司获悉，湖北房(县)五(峰)高速公路最长斜井——佛照山隧道1号斜井当日贯通，为隧道主洞实现“贯通见面”按下了加速键。
作为国家规划的高速公路南北纵线、湖北省“十四五”交通规划的重点项目，房五高速全长约256公里，建成后可使十堰、神农架、宜昌西部连成一片，推动秦巴山和武陵山片区的协同发展。
目前在建的房五高速兴长段横跨兴山、秭归、长阳三县，全长72.014公里，总投资195.089亿元，桥隧比高达88.15%。全长10.4公里的佛照山隧道地处秭归县，为湖北省在建最长公路隧道，最大埋深1296米，所在区域面临突泥涌水、岩溶、软岩大变形等多种不良地质灾害，是全线施工难度最大的重点控制性关键工程。截至目前，该隧道正洞单洞累计掘进超过5000米。
此次贯通的1号斜井全长1280米，施工中需同时应对断面跨度大、支护难度高、反坡排水压力大的三重挑战。据项目负责人介绍，1号斜井的贯通标志着佛照山隧道施工从“单辅助”正式升级为“双辅助”模式，正洞作业面将较之前新增4个，施工效率预计提升50%以上。(完)
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