江西首条大直径高铁盾构隧道贯通|欧美丰满老熟妇XXXXX性
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中新社北京11月28日电 (记者 刘文文)记者从中铁十四局获悉,江西省首条大直径高铁盾构隧道昌九高铁天祥大道隧道28日顺利贯通,为昌九高铁全线铺轨施工打下坚实基础。
天祥大道隧道是昌九高铁关键控制性工程,北起南昌市高新区昌东镇阳门村,南至高新区昌东镇山湖村,全长6.379公里,为单洞双线隧道,盾构段长4.4公里,盾构直径14.8米。这是是目前国内施工环境和穿越地质条件最为复杂的高铁盾构隧道之一。
据中铁十四局昌九高铁盾构项目总工程师张敬祥介绍,在盾构施工时,盾构机需要穿越“上土下岩”风化不均的2000余米复合地层,地层中的全风化泥质砂岩质地黏软如“橡皮泥”。项目团队利用化学药剂浸泡、高压水枪冲洗和改造刀盘结构等关键技术,改变黏土黏性并粉碎泥饼,从而减少泥岩附着刀盘,有效解决盾构刀具磨损大、质量隐患多、掘进效率低等难题。
昌九高铁连接江西省南昌市和九江市,正线全长137.7公里,是国家《中长期铁路网规划》“八纵八横”高铁主通道京港高铁的重要组成部分。昌九高铁建成通车后,京港大通道将全部贯通,将进一步完善中国高速铁路网布局,加强长江中游城市群、环鄱阳湖城市群与长三角、粤港澳周边城市群的互联互通,对于助力长江经济带发展具有重要意义。(完)
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