铁道科学与工程学报2025，Vol.22Issue(1)：221-234,14.DOI:10.19713/j.cnki.43-1423/u.T20240465
极软岩大变形隧道交叉口段主被动支护技术应用
Active and passive support technologies applied at intersection of soft rock tunnel with large deformation
摘要
Abstract
The control measures for soft rock tunnels with large deformation primarily encompass passive support technologies is often characterized by rigid steel frame and composite linings.Active support technologies is exemplified by high-strength prestressed anchor(cable),multi-layered support deformation control technologies combined with active and passive support,as well as yielding support technologies.However,the selection of supports in practical engineering remains a challenging problem.Based on a railway tunnel project with extremely soft surrounding rock in southwest China,this paper investigated the utilization of active and passive comprehensive support technique to address the issues of continuous deformation and instability of supporting structures during ripping construction at intersection.Additionally,the contact pressure between the primary and secondary lining,the pressure of steel pipe columns,the deformation of primary support structure and the stress of secondary lining were monitored and analyzed.The results are drawn as follows.The implementation of"double primary support+Φ325 steel pipe column support"passive support in the intersection section effectively mitigates rapid arch settlement of initial support.The 20 m long Φ76 self-drilling long anchor pipes have been adopted at the arch for active reinforcement,achieving"anchoring replacing supporting".High-stiffness I25b single-layer initial support are used for rapid enclosure,providing early support resistance to restrict continuous deformation of the surrounding rock.3 m/6 m short secondary lining lock is quickly constructed in accordance with the principle of"partition construction and lining closure",which can control the long-term creep of surrounding rock.It took 275 days to complete the second lining construction at the intersection section,which relieved the risk of continuous deformation and instability of the support structures.The successful application of this comprehensive support technique can provide valuable references for similar projects.关键词
铁路隧道/极软岩大变形/交叉口/钢管立柱支撑/以锚代撑/主被动支护Key words
active and passive supports/anchor replacing temporary supporting/intersection/large deformation of extremely soft rock/railway tunnel/steel pipe column supports分类
交通运输引用本文复制引用
皮圣,范晓锋,王明年,梁禹..极软岩大变形隧道交叉口段主被动支护技术应用[J].铁道科学与工程学报,2025,22(1):221-234,14.基金项目
国家自然科学基金资助项目(52378427) （52378427）
广东省自然科学基金资助项目(2023A1515030258,2024A1515012623) （2023A1515030258,2024A1515012623）
