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Study on the influence of confining stress on TBM performance in granite rock by linear cutting test

机译：线切割试验研究围岩应力对花岗岩岩石TBM性能的影响

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摘要

Rock stress problems induced by overburden or anisotropic stresses are significant to the TBM tunneling. In this paper, the effect of different confining stressed conditions on TBM performance are investigated by using full-scale cutting tests with large intact granite specimens (1000 mm x 1000 mm x 600 mm). In these tests, the effects of confining stresses on the normal force, rolling force, the cutting coefficient and specific energy are analyzed. It is found that the confining stress has significant impact on the normal force and rolling force. Specifically, for the same cutting spacing and penetration depth, the normal force increases with increasing confining stress due to enhancement of the rock resistance strength; meanwhile the rolling force decreases gradually with increasing confining stress. The stress deviation between two confining directions affects the optimum penetration that corresponds to small specific energy. The results provide better understanding of the effect of confining stress on the TBM performance and also recommend some guidelines for TBM tunneling under stressed geological condition. (C) 2016 Elsevier Ltd. All rights reserved.
机译：由上覆应力或各向异性应力引起的岩石应力问题对于TBM隧道掘进很重要。本文通过对大型完整花岗岩样品（1000 mm x 1000 mm x 600 mm）进行全面切割试验，研究了不同围压条件对TBM性能的影响。在这些测试中，分析了限制应力对法向力，滚动力，切削系数和比能的影响。发现约束应力对法向力和滚动力有显着影响。具体地说，对于相同的切削间距和穿透深度，由于抗岩强度的提高，法向力随着围压的增加而增加。同时，随着围压的增加，轧制力逐渐减小。两个限制方向之间的应力偏差会影响对应于较小比能量的最佳穿透力。结果更好地了解了限制应力对TBM性能的影响，并为在受压地质条件下TBM隧穿提出了一些指导原则。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Tunnelling and underground space technology》 |2016年第8期|145-150|共6页
  • 作者

    Ma Hongsu; Gong Qiuming; Wang Ju; Yin Lijun; Zhao Xiaobao;

  • 作者单位

    CNNC Beijing Res Inst Uranium Geol, Beijing, Peoples R China;

    Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing, Peoples R China;

    CNNC Beijing Res Inst Uranium Geol, Beijing, Peoples R China;

    Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing, Peoples R China;

    Inst Underground & Geoenvironm, NJU ECE, Nanjing 210093, Jiangsu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    TBM performance; Confining stress; Granite; LCM;

    机译：TBM性能;围压;花岗岩;LCM;力学性能;

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