Improvement on efficiency and reliability of Full-Face Tunneling Boring Machine

目前，各种类型的隧道掘进机（TBM）被广泛用于替代传统的隧道掘进方法。TBM的性能可能远远优于传统方法。然而，TBM的性能是非常差的条件下，是不利于TBM的应用。因此，测量的地质特征，以提高效率的工作面前方是必不可少的。在本研究中，提出了一种方法来估计岩石强度的工作面使用TBM切削力，如推力，扭矩和切削深度。岩石强度沿着隧道估计从实际挖掘数据的部分，在几百米长。然后将估计的强度与使用基岩调查和施密特锤回弹硬度获得的强度进行比较。估计的岩石强度，发现同意以及使用这些调查发现。此外，还讨论了岩体分类与岩体强度估算之间的关系。估计的岩石强度被认为是在良好的协议与岩体分类。因此，该方法为快速变化的岩体特性提供了一种合理选择支护方式的有效方法，从而防止事故发生，减少施工时间和费用。

At present, various types of tunneling boring machines (TBMs) are widely used as a substitute for conventional tunneling methods. The performance of TBM is potentially far better than that of conventional methods. However, TBM performance is very poor when applied under conditions that are adverse to TBM.Therefore, measuring geological characteristics forward of the face is essential in order to improve the efficiency of TBM.In the present study, a method for estimating the rock strength of face using TBM cutting force, such as thrust, torque and cutting depth, is proposed. Rock strength along the tunnels is estimated from actual excavation data for sections a few hundred meters in length. The estimated strengths were then compared with those obtained using the bedrock survey and Schmidt-hammer rebound hardness. Estimated rock strengths were found to agree well with those found using these surveys. Moreover, the relationships between rock mass classification and estimated rock strength are discussed. The estimated rock strength was found to be in good agreement with the rock mass classification. Therefore, the proposed method provides a useful method for properly selecting a supporting pattern for rapidly changing rock mass characteristics, thereby preventing accidents and reducing construction time and expense.