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首页> 外文期刊>Tunnelling and underground space technology >Application of block theory for evaluating face stability under disc cutters loading of TBM, case study of a water-conveyance tunnel project
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Application of block theory for evaluating face stability under disc cutters loading of TBM, case study of a water-conveyance tunnel project

机译：块理论在椎间盘切割机载荷下稳定性评价的应用，水输送隧道工程案例研究

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摘要

Block theory has been widely used in analyzing the stability of rock blocks during engineering activities in jointed rock masses due to its simplicity and computational efficiency. This paper extended the traditional block theory to tunnels constructed using tunnel boring machine (TBM) by incorporating the disc cutter-block interaction mechanism. The rock blocks were divided into front, corner and rear blocks according to their spatial positions with respect to the cutterhead. The interaction between different blocks and the disc cutters mounted on the cutterhead were examined by estimating the forces exerted by disc cutters on the blocks relative to the location of the blocks in the face, direction of movement of the discs, and the depth of penetration. The estimated forces were then used in a subsequent analysis to calculate factor of safety for individual blocks and probability of blocks dislodging from its location. Two new evaluation parameters, e(A) and e(eta), were proposed to account for the probability of block instability. e(A) is the ratio of exposed area of unstable blocks to the face area and quantifies the size of unstable blocks relative to the face, and e(eta) is the ratio of cutterhead rotation angles making a block unstable to the total rotation angles in a revolution which reflects the possibility of encountering an unstable block during a single round of revolution. This paper discussed the implementation of the idea of using fundamental concepts of block theory to determine block stability at the face and related analysis for assessment of face stability. The proposed method was used in evaluation of the stability conditions for a water-conveyance tunnel in western China that is currently under construction using a hard rock TBM.
机译：由于其简约和计算效率，块理论已被广泛用于分析连接岩体中的工程活动期间岩块的稳定性。本文将传统的块理论扩展到使用隧道镗床（TBM）构造的隧道，通过结合圆盘切割机块相互作用机制。根据其空间位置相对于切割口，将岩石块分成前部，角和后块。通过估计块上的盘式切割器在面部块的位置，盘的运动方向和穿透深度的位置来检查不同块和安装在切割口上的盘切割器之间的相互作用。然后在随后的分析中使用估计的力，以计算用于从其位置脱位的单个块的安全因子和块的概率。建议两个新的评估参数，E（A）和E（ETA），以解释块不稳定的概率。 e（a）是不稳定块的暴露区域与面部区域的比率，并定量相对于面部的不稳定块的尺寸，并且e（eta）是切割口旋转角度的比率，使得块对总旋转角度不稳定在革命中，反映了在一轮革命期间遇到不稳定块的可能性。本文讨论了利用块理论的基本概念来确定面部块稳定性的思想，以及对面部稳定性评估的相关分析。所提出的方法用于评估西部水运隧道的稳定条件，目前正在使用硬岩TBM建设。

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  • 来源
    《Tunnelling and underground space technology》 |2019年第8期|249-263|共15页
  • 作者

    Zhang Zixin; Wang Shuaifeng; Huang Xin; Rostami Jamal;

  • 作者单位

    Tongji Univ Coll Civil Engn Dept Geotech Engn 1239 Siping Rd Shanghai 200092 Peoples R China|Tongji Univ Minist Educ Key Lab Geotech & Underground Engn Shanghai 200092 Peoples R China;

    Tongji Univ Coll Civil Engn Dept Geotech Engn 1239 Siping Rd Shanghai 200092 Peoples R China|Tongji Univ Minist Educ Key Lab Geotech & Underground Engn Shanghai 200092 Peoples R China;

    Tongji Univ Coll Civil Engn Dept Geotech Engn 1239 Siping Rd Shanghai 200092 Peoples R China|Tongji Univ Minist Educ Key Lab Geotech & Underground Engn Shanghai 200092 Peoples R China;

    Colorado Sch Mines Dept Min Engn Earth Mech Inst Golden CO 80401 USA;

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

    Block theory; TBM tunnel; Jointed rock mass; Face stability; Cutter-block interaction;

    机译：块理论;TBM隧道;关节岩体;面部稳定性;切割块相互作用;

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