
由江西交工公路工程公司承建的大广高速扩容工程B3标江西信丰县大阿镇分水坳隧道于5月30日顺利贯通,该隧道为B段第一座实现单洞贯通的隧道。
自2020年4月12日进洞施工以来,历时349天,在项目部全体参建员工共同努力下,克服重重困难,顺利实现单洞贯通。据了解,施工中分水坳隧道进口YK71+841掌子面存在软弱夹层,围岩自稳能力差,拱顶时有坍塌发生。对此,项目部通过多次邀请专家、业主、总监办及设计等多方现场查看及论证,制定应用超前注浆长管棚、拱顶塌腔混凝土填充、调整加强初期支护参数等最佳施工方案,确保隧道施工顺利进行。
据悉,分水坳隧道位于信丰县大阿镇,全长690米,是一座单幅单洞三车道高速公路隧道。隧道地处构造剥蚀低山地貌区,地势陡峻,地形复杂,相对高差约99.72米,进出洞口山体坡度较陡,围岩等级主要为Ⅳ级和Ⅴ级。
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