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。
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.
关键词
隧洞 /
开挖卸荷 /
围岩 /
衬砌 /
流变 /
塑性区 /
稳定性
Key words
tunnel /
unloading caused by excavation /
surrounding rock /
lining /
rheology /
plastic zone /
stability
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基金
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)
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