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隧道建设(中英文) ›› 2017, Vol. 37 ›› Issue (S1): 72-78.DOI: 10.3973/j.issn.1672-741X.2017.S1.012

• 研究与探索 • 上一篇    下一篇

考虑围岩应变强化及扩容的深埋软岩隧洞时变位移解

唐胜兰1, 王海2, 俞缙1,*, 张建智1, 蔡燕燕1   

  1. (1. 华侨大学福建省隧道与城市地下空间工程技术研究中心, 福建厦门 361021; 2. 中交第一公路勘察设计研究院有限公司, 陕西西安 710075)
  • 收稿日期:2017-01-09 修回日期:2017-04-01 出版日期:2017-05-20 发布日期:2017-05-27
  • 作者简介:唐胜兰(1992—),女,福建福州人,华侨大学岩土工程专业在读硕士,研究方向为岩石力学。Email: 354303731@qq.com。*通讯作者: 俞缙, Email: bugyu0717@163.com。
  • 基金资助:

    国家自然科学基金资助项目(51679093,51374112); 福建省高校新世纪优秀人才支持计划; 福建省高校杰出青年科研人才培育计划

Timevarying Displacement Analytical Solution of Deep Soft Rock Tunnel Considering Strainhardening and Dilatation of Surrounding Rock

TANG Shenglan1, WANG Hai2, YU Jin1,*, ZHANG Jianzhi1, CAI Yanyan1   

  1. (1. Fujian Engineering Technology Research Center for Tunnel and Underground Space, Huaqiao University, Xiamen 361021, Fujian, China; 2. CCCC First Highway Consultants Co., Ltd., Xi’an 710075, Shaanxi, China)
  • Received:2017-01-09 Revised:2017-04-01 Online:2017-05-20 Published:2017-05-27

摘要:

为描述深埋软岩隧洞围岩时变位移受岩石应变强化与扩容协同影响的复杂力学过程,假设岩体为符合Burgers体与Drucker-Prager屈服准则组合的黏弹塑性模型,在考虑应变强化及扩容效应影响的初始应力场下,推导得到深埋软岩隧洞的黏弹塑性时变位移解析解并进行分析。结果表明: 该解析解能较好地描述软岩隧洞蠕变位移受岩体应变强化和扩容的影响。随着幂强化指数或剪胀角的增大,隧洞围岩的时效变形逐渐增大,且发展变快。隧洞围岩在应变强化和扩容效应的共同影响下,幂强化指数与剪胀角越大,其位移越敏感,且幂强化指数对围岩位移的敏感性更高。为验证该解析解的实用价值,与工程实测数据进行对比,结果显示计算值与实测值吻合较好,表明该解析解对深埋软岩隧洞时变位移预测具有一定的借鉴意义。

关键词: 深埋软岩隧道, 应变强化, 扩容效应, 幂强化模型, 时变位移解, 剪胀角, 幂强化指数

Abstract:

The deformation of deep tunnels in soft rocks is a complex mechanical process under the effects of strainhardening and dilatation of surrounding rock. To describe this process, a combination model of a Burgers body with a friction plate considering DruckerPrager criterion is used when the excavation are finished, and the surrounding rock performed as an elastoplastic material. Under this condition, the timevarying displacement analytical solution of the surrounding rock is deduced considering dilatancy for the deep tunnel in soft rock. The results show that the timedependent deformation of surrounding rock increases with the increase of powerhardening index or that of dilatancy angle. When the tunnel surrounding rock is affected by both strainhardening effect and dilatancy effect, the powerhardening index and dilatancy angle become severer, the displacement is more sensitive, and the powerhardening index is more sensitive to the displacement of surrounding rocks. So, strainhardening and dilatancy of soft rock influence greatly on the creep of surrounding rock. The calculated results of coincide with the actural measured data very well.

Key words: deep soft rock tunnel, strain hardening, dilatation effect, powerhardening model, timevarying displacement analytical solution, dilatancy angle, powerhardening index

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