Study of long-term stability of new support structure in carbonaceous phyllite tunnels with ultra-large sections

YUAN Xiao-shuai; ZHANG Qing-song; LI Shu-cai; LI Li-ping; LIU Qin

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Study of long-term stability of new support structure in carbonaceous phyllite tunnels with ultra-large sections

更新时间：2026-06-25

- Study of long-term stability of new support structure in carbonaceous phyllite tunnels with ultra-large sections
- Vol. 32, Issue S2, (2011)
- 作者机构：
  
  山东大学岩土与结构工程研究中心,济南,250061
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU452
- Online First：26 August 2011，
  
  Published：2011
- 稿件说明：
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YUAN Xiao-shuai, ZHANG Qing-song, LI Shu-cai, et al. Study of long-term stability of new support structure in carbonaceous phyllite tunnels with ultra-large sections[J]. 2011, 32(S2).
DOI：

YUAN Xiao-shuai, ZHANG Qing-song, LI Shu-cai, et al. Study of long-term stability of new support structure in carbonaceous phyllite tunnels with ultra-large sections[J]. 2011, 32(S2). DOI：

摘要

针对兰渝铁路两水隧道岩质软、跨度大的特点，采用加厚初喷、二衬和双层型钢拱架的新型支护方式。通过对现场岩样的室内三轴蠕变试验，研究炭质千枚岩蠕变特性。试验结果表明，伯格斯蠕变模型能比较准确地描述其长期流变行为。运用大型岩土工程分析软件FLAC3D，结合现场新型支护方式，模拟隧道建成后DK357+976处围岩的流变力学行为，分析隧道在运营过程中围岩的变形和支护结构的受力情况。结果表明：在隧道100 a的使用期限内，二次衬砌能有效地减小围岩蠕变变形，支护结构中仅拱顶初喷在后期产生破坏，现场支护方式可以保证隧道的长期稳定性。

Abstract

In connection with Lan-Yu railway Liangshui Tunnel’s characteristics of soft rock and large span

a kind of new type support structure including thickening shotcrete and secondary liner and double deck is adopted. A laboratory triaxial creep test to on-site specimens is carried out to study the creep properties of the carbonaceous phyllite. According to the test results

Burgers creep model is adopted to describe the long-term rheological behaviour of carbonaceous phyllite. Combined with on-site practical support ways; the fast Lagrangian analysis of continua in 3 dimension (FLAC3D) is used to simulate surrounding rock’s rheological mechanical behaviour in DK357+976 after the completion of this tunnel. Surrounding rock’s deformation and supporting structure’s mechanical behaviour during operation are analyzed. The research results show that secondary liner can effectively reduce surrounding rock’s creep deformation; and only part of vault shotcrete will yield 100a later. The on-site new support ways can ensure long-term stability of the tunnel.

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