Some attempts for estimating rock strength and rock mass classification from cutting force and investigation of optimum operation of tunnel boring machines
Some attempts for estimating rock strength and rock mass classification from cutting force and investigation of optimum operation of tunnel boring machines
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DOI：
10.1007/s00603-005-0071-6
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发表时间：
2006-02-01
影响因子：
6.2
通讯作者：
Okubo, S
中科院分区：
文献类型：
--
作者：
Fukui, K;Okubo, S
隧道掘进机（TBM）开挖过程中，由于难以正确识别开挖岩石的性质，隧道掌子面和壁面坍塌是常见的。然而，这种识别可以通过使用切削力来估计岩石强度来简化，这种方法在日本隧道开挖中已经被证明是相当成功的。本文总结了隧道开挖经验中有关切削力的知识，讨论了岩石强度与TBM施工的关系。尽管TBM操作员依靠直觉来适当设置刀盘速度，但该决策过程代表了一种利用刀盘变速能力的逻辑操作方法。开挖面支护方式的选择也是隧道开挖中的一个关键问题。这个选择过程是基于岩石的条件，这是很难确定快速和准确地在隧道开挖。本文使用两个隧道的开挖来证明，当钻一个统一的岩石类型时，可以根据岩石强度准确地分配岩体分类。研究还表明，当钻穿混合岩石类型时，可以根据单轴抗压强度归一化的岩石强度对岩体进行分类。
Tunnel face and wall collapse are common during excavations performed by tunnel boring machines (TBMs) due to the difficulty of correctly identifying the properties of the excavated rock. This identification, however, can be simplified by using the cutting force to estimate rock strength, a method that has already proved quite successful in Japanese tunnel excavations. This paper summarizes knowledge relating to the cutting force obtained through tunnel excavation experience, and the relationship between rock strength and TBM operation is discussed. Although TBM operators rely on intuition to set the cutter head speed appropriately, this decision process represents a logical method of operation that takes advantage of the variable speed capability of the cutter head. Selection of appropriate support methods for the excavated face is also a critical issue in tunnel excavation. This selection process is based on the condition of the rock, which is difficult to determine quickly and accurately during tunnel excavation. The present paper uses the excavation of two tunnels to demonstrate that it is possible to assign rock mass classifications accurately based on rock strength when boring a uniform rock type. It is also shown that the rock mass can be classified from the rock strength normalized by the uniaxial compressive strength when boring through mixed rock types.