TBM滚刀刀圈与岩石的滑动磨损实验研究

硬岩隧道掘进机(TBM)的滚刀刀圈在破岩过程中面临剧烈的磨损,对TBM的掘进效率及施工成本影响巨大。为了深入研究全断面隧道掘进机滚刀刀圈的磨损机理,本文在M-200型磨损试验机上模拟了TBM滚刀刀圈与岩石的磨损行为。基于实验数据,验证了磨粒磨损引起的磨损量与摩擦距离的线性关系,分析了岩石硬度、摩擦系数和润滑对磨粒磨损速率的影响。实验结果表明,在大载荷下,磨损形式将由单纯的磨粒磨损转化为磨粒磨损与疲劳磨损共同存在的形式,并且计算了疲劳磨损量,进而对比了磨粒磨损量与疲劳磨损量的大小。结论:硬度、摩擦系数越大,滚刀刀圈磨损越严重;润滑对降低磨损有重要作用;在大载荷作用下,磨损状态将由磨粒磨损转化为磨粒磨损和疲劳磨损共存的状态。上述研究结果可以为TBM滚刀刀圈设计及施工提供一定的参考。

Experimental Investigation on Skimming Wear Mechanism between TBM Cutter Ring and Rock

Hard rock tunnel boring machine (TBM) cutter ring is subjected to severe wear in rock breaking process, which has a huge impact on the TBM efficiency and tunneling cost. In order to study the wear mechanism of tunnel boring machine cutter ring, abrasion experiment was conducted on an M-200 abrasion tester to simulate the abrasion behavior between cutter ring and rock. Based on experimental data, linear relationship between the wear amount caused by abrasive wear and the friction distance was verified and the influence of rock hardness, friction coefficient and lubrication on abrasion wear was also analyzed. Experimental results show that under large load condition, wear form converts from a simple abrasive wear to a co-existence form of abrasive wear and fatigue wear, and the fatigue wear rate was calculated under certain load condition to compare respective wear amount of abrasive wear and fatigue wear. It is concluded that higher rock hardness and larger friction coefficient cause more severe wear of cutter ring; lubrication plays an important role to reduce the wear; under large load condition, wear form converts from a simple abrasive wear to a co-existence form of abrasive wear and fatigue wear. Above understanding may benefit the design of TBM cutter and the tunnel construction.