土工基础

›› 2014, Vol. 28 ›› Issue (2): 30-33.

• 工程实录 • 上一篇    下一篇

全风化断层破碎带公路隧道施工技术

郭 健   

  1. (中铁十局集团青岛分公司，山东青岛 266555)
  • 收稿日期:2013-09-25 出版日期:2014-04-21 发布日期:2014-04-25
  • 作者简介:郭健(1973-)，男，山东临沂人，工程师，研究方向为岩土工程施工及技术管理。

Construction Techniques of Highway Tunnels Through a Complete WeatheredFractured Fault

GUO Jian   

  1. (Qingdao Engineering Branch Co., Ltd., China Railway 10th Bureau Group, Qingdao, 266555)
  • Received:2013-09-25 Online:2014-04-21 Published:2014-04-25

摘要： 三亚某公路隧道穿越一条石英岩断层破碎带，隧道开挖揭示该断层破碎带呈全风化状态，地层自稳能力极差。在施工中出现了涌泥、拱部大变形及变形严重侵限等问题，采用原来的台阶法施工无法保证施工安全。通过对比分析，采用水泥-水玻璃双浆液注浆加固隧道周边地层，然后进行中管棚超前支护，采用六分部CRD法开挖，及时封闭每一部支护结构，增强隧道支护结构的刚度，控制隧道变形。用三维数值模拟方法对CRD施工过程中隧道变形、支护和二衬受力进行了分析，验证了施工方法的可行性。现场监测结果和施工效果表明，所采用施工方案能有效保证隧道施工安全。

关键词: 全风化, 断层破碎带, 公路隧道, 三维有限元, CRD法

Abstract: A tunnel in Sanya City will align through a broken quartz fault. The excavation in tunnel indicates that surrounding rock in the fault is completely weathered and it has a poor stability property. The mud rush and severe deformation at the arch were encountered during the excavation and the original construction procedures could not be safely implemented. Based on the comparison of the construction supporting method, the following comprehensive technique is selected to control the deformation of tunnel: grouting with double grouts, middlesized pipe roof presupport and sixpart CRD excavation method with independent closure strong supporting structure in time. Threedimensional numerical method is performed to analyze the deformation of tunnel and the stress of the initial supporting structure and lining. The field monitoring result and construction effects have shown that the selected construction scheme can ensure the tunnel excavation safety.

Key words: Completely Weathered Materials, Fractured Fault, Highway Tunnels, 3D FEM, CRD Cutting Method