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隧道建设(中英文) ›› 2018, Vol. 38 ›› Issue (9): 1520-1528.DOI: 10.3973/j.issn.2096-4498.2018.09.015

• 规划与设计 • 上一篇    下一篇

Design Method and Application of Rock and Support System for Superlarge Span Tunnel(超大跨度隧道围岩支护体系构件化设计方法及其应用研究)

LYU Gang1, LIU Jianyou1, *, ZHAO Yong2   

  1. (1. 中铁工程设计咨询集团有限公司, 北京 100055; 2. 中国铁路经济规划研究院, 北京 100038)
  • 收稿日期:2018-03-06 修回日期:2018-07-27 出版日期:2018-09-20 发布日期:2018-09-30
  • 作者简介:吕刚(1976—),男,江苏句容人,2004年毕业于北京交通大学,桥梁与隧道工程专业,硕士,高级工程师,主要从事隧道工程设计和研究工作。Email: tzydglg@126.com。 *通信作者: 刘建友, Email: 13522182378@163.com。

超大跨度隧道围岩支护体系构件化设计方法及其应用研究

吕刚1, 刘建友1,*, 赵勇2   

  1. (1. China Railway Engineering Consulting Group Co., Ltd., Beijing 100055, China; 2. China Railway Economic and Planning Research Institute, Beijing 100038, China)
  • Received:2018-03-06 Revised:2018-07-27 Online:2018-09-20 Published:2018-09-30

摘要:

In order to guarantee the stability of surrounding rock and support structure of superlarge span tunnel and realize quantification of support structure design, the optimal excavation contour line shape is obtained based on study of influence of initial ground stress on bearing arch of surrounding rock; a new quantitative design method, in which the surrounding rock is regarded as an arch structure, bolts, cables, shotcrete and lining are designed to satisfy the intensity, rigidity and stability of the arch structure, is presented to design the support structure system. The method has been successfully applied to superlarge span tunnel of Badaling Great Wall Station on BeijingZhangjiajie Highspeed Railway; and the applicable results show that the maximum accumulative settlement of crown top of largespan section is only 17.3 mm, and the relative subsidence of crown top is only 0.09%, which can meet safety requirements.

关键词: superlarge span tunnel, optimal excavation contour line, surrounding rock bearing arch, supporting structure system

Abstract:

为解决超大跨度隧道围岩和支护结构的稳定性问题,实现支护结构设计的定量化,根据初始地应力对围岩承载拱受力的影响,得到围岩受力最优的开挖轮廓线形状,提出围岩支护结构体系构件化设计方法,即将隧道周边一定范围内的围岩圈作为一个拱形结构进行强度、刚度和稳定性计算,进而设计锚杆、锚索、喷射混凝土和衬砌等支护结构。围岩支护结构体系构件化设计方法成功应用于京张高铁八达岭长城站超大跨隧道的设计中。实践表明,在采用该方法设计的支护结构体系作用下,大跨段拱顶最大累计沉降仅为17.3 mm,拱顶相对下沉仅为0.09%,能够满足工程安全需要。

Key words: 超大跨度隧道, 最优开挖轮廓线, 围岩承载拱, 支护结构体系

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