武汉长江隧道管片结构关键技术研究  

Study on Key Technologies of Shield Segment of Wuhan Yangtze River Tunnel

作　　者：肖明清[1] 邓朝辉[1] 何川[2] 

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]西南交通大学,成都610031

出　　处：《铁道工程学报》2011年第10期84-89,共6页Journal of Railway Engineering Society

摘　　要：研究目的:盾构隧道管片结构是影响工程安全、工程造价和施工速度的关键因素。武汉长江隧道具有大直径、高水压、掘进距离长、地层强透水、河床冲淤变化幅度大、地质条件复杂等难点,在国内缺少类似经验的前提下,针对该隧道特殊的建设条件,对盾构隧道管片结构的关键技术进行研究,确保结构的安全可靠,并为类似工程提供借鉴经验。研究结论:在国内首次提出了"通用楔形环、2 m环宽、九等分"的大直径盾构隧道结构新型式,并对不同厚度下管片结构的受力状态进行了比较,推荐管片厚度采用0.5 m。该结构安全可靠,经济性好,与工程建设条件具有较好的适应性。同时采用三维壳弹簧模型对该结构的内力分布特征进行了研究,揭示了大环宽管片两侧弯矩较大、中间弯矩较小的特点,故沿环宽的不同部位可以采用不同的配筋,以节省工程投资。Research purposes： The segment of shield tunnel is the key factor that affect engineering safety, engineering cost and construction speed. Wuhan Yangtze river tunnel exists some engineering difficulties, such as excavation surface with large diameter, high water pressure, long distance, stratum with strong water permeability, big variations of river bed, complex geological condition, and so on. On condition that there is no more similar experiences at home, it should conduct a study on key technologies of segment of shield tunnel to ensure the security and reliable of the structure, and the obtained conclusions can offer a guideline for the similar underground projects. Research conclusions：First proposed a new type of the large diameter shield tunnel structure, which is ＂general - purpose and wedge - shaped ,2 - meter width , nine uniform blocks ＂,and by comparing with the different thickness of the segments under stress, recommends adoption of 0.5 - meter thickness of the segment. This structure is safe and reliable, economic and effective, more adaptive to the construction of the project. This paper studied on the distribution of internal force of the structure by using the 3 D shell - spring model, reveals the feature of the large - width segment that the bending moment at both sides are bigger than that in the middle. So it can draw a conclusion that different parts of the segment use the different reinforcement along the width of the segment to cut down engineering cost.

关 键 词：长江隧道 管片结构 大环宽 九等分 

分 类 号：U45[建筑科学—桥梁与隧道工程]