南水北调工程天津干线下穿京九铁路隧道工程设计

为研究和解决南水北调天津干线工程下穿京九铁路隧道施工安全问题,采用有限元软件对隧洞开挖过程进行分析计算,进行了隧洞防渗设计和铁路加固设计,最大限度地克服施工期间箱涵与铁路运营之间的相互干扰,保障施工安全。设计方案体现了临时支护拆除量少,成洞质量高、速度快,对列车限速时间短等特点,既减少了施工对铁路运营造成的影响,又保证了天津干线箱涵输水运行及检修安全。推荐的设计方案在京广铁路和津霸铁路上进行了推广使用。

Engineering design of tunnel beneath the Beijing2Kowloon railway in Tianjin section of South2to2North Water Diversion Project

In or der t o study and r esolv e the tunnel constructio n safety pro blem beneath t he Beijing2Kow loon railway in Tianjin sectio n o f South2to2 No rth Water Div ersio n Pr oject, the finite element softw ar e w as used to calculat e and analyze the tunnel ex ca2 v ation pro cess and to co nduct the anti2seepag e desig n fo r the tunnel and r ail r einfor cement desig n, w hich can over come the mu2 tual int erference betw een the culver t and ra ilw ay o per ator s during the co nstr uction and ensure the constructio n safety . T he de2 sig n scheme has the character istics of small amo unt of tempor ary suppor t remov al, high2quality cavitatio n, and shor t time of train speed limit, which can not o nly r educe the impacts of co nstr uctio n o n railwa y operation, but also ensure t he culv ert w ater transfer o per ation in Tianjin section and maintenance safety . The desig n scheme presented in this pa per can prov ide r efer ence for the Beijing2Guangzhou railwa y and T ianjin2Bazhou railw ay.