长江科学院院报 ›› 2015, Vol. 32 ›› Issue (7): 99-104.DOI: 10.3969/j.issn.1001-5485.2015.07.018

• 岩土工程 • 上一篇    下一篇

不同埋深对某水电站隧洞围岩流变稳定性影响

王瑞红1, 2, 郭金龙3, 宛良朋4, 汤天彩1   

  1. 1. 三峡大学 三峡库区地质灾害教育部重点实验室,湖北 宜昌 443002;
    2.长江科学院 水利部岩土力学与工程重点实验室,武汉 430010;
    3.贵阳勘测设计研究院 工程科研分院,贵阳 550000;
    4.武汉大学 水利水电学院, 武汉 430072
  • 收稿日期:2014-06-27 出版日期:2015-07-01 发布日期:2015-07-07
  • 作者简介:王瑞红(1981-),女,湖北宜昌人,副教授,博士,主要从事边坡岩体开挖卸荷力学特性方面的研究工作,(电话)13886700508(电子信箱)43604258@qq.com。
  • 基金资助:
    国家重点基础研究发展计划(973)(2012CB426502);国家自然科学基金资助项目(51479102);长江水利委员会长江科学院开放研究基金(CKWV2013207/KY);三峡大学土木与建筑学院硕士论文培优基金(PY201415)

Effect of Buried Depth on the Rheological Stability of Surrounding Rock of a Dam Tunnel

WANG Rui-hong1,2, GUO Jin-long3, WAN Liang-peng4, TANG Tian-cai1   

  1. 1.Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education, China Three Gorges University, Yichang 443002, China;
    2.Key Laboratory of Geotechnical Mechanics and Engineering of MWR,Yangtze River Scientific Research Institute,Wuhan 430010,China;
    3.Engineering Research Institute, Power China Guiyang Engineering Corporation Limited, Guiyang 550000, China;
    4.School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, China
  • Received:2014-06-27 Published:2015-07-01 Online:2015-07-07

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摘要： 在高埋深下进行隧洞的开挖意味着将克服巨大的构造应力与自重应力,而在进行洞室开挖设计中地应力作用也是不容忽视的。因此,基于卸荷岩体理论和流变理论,依托室内流变试验进行了相关流变参数的反演,结合有限元分析软件ANSYS以及有限差分软件FLAC对比分析了不同埋深下隧洞围岩在加衬砌前后的蠕变变形量、塑性区等。结果表明:随着埋深的增加,隧洞周围的卸荷作用会越来越明显;洞室的开挖卸荷及洞侧围岩的共同作用,使得隧洞在埋深由浅及深的过程中经历了从“压力拱”的出现到消失的过程;当埋深增加时隧洞的水平向位移越来越大,洞侧变形将成为影响隧洞稳定的一个主要控制因素。

关键词: 隧洞, 开挖卸荷, 围岩, 衬砌, 流变, 塑性区, 稳定性

Abstract: Tunnel excavation with large depth will be confronted with huge tectonic stress and self-weight stress, and the geostress cannot be ignored in the design of excavation. According to theoretics of unloading and rheology, inversion of rheological parameters were conducted based on indoor rheological tests, and furthermore, the creep deformation and plastic zone of surrounding rock at different depths before and after lining were compared and analysed by ANSYS and FLAC. Results reveal that as buried depth increased, the tunnel’s unloading effect became more obvious; a pressure arch occurred and then disappeared under the joint action of unloading and surrounding rock; and the tunnel’s horizontal displacement increased, hence lateral deformation became a controlling factor of tunnel’s stability.

Key words: tunnel, unloading caused by excavation, surrounding rock, lining, rheology, plastic zone, stability

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