盾构盘形滚刀损坏机理的力学分析与应用

Mechanical Analysis of TBM Disc Cutter Damage Mechanism and Its Application

文章对盾构盘形滚刀损坏的力学机理进行了研究,应用CSM模型对滚刀破岩荷载进行求解,得到了滚刀损坏的临界最大贯入度和滚刀不能转动(偏磨)的临界最小贯入度计算公式,并对影响滚刀破岩荷载和影响临界贯入度的各种因素进行了分析。为便于现场应用,绘制了便于查阅的曲线图,并给出了应用示例。研究结果表明:掘进过程应根据岩石强度和刀具磨损情况的变化调整贯入度范围,其值应控制在临界最小和最大贯入度之间。研究结果对盾构机的现场施工具有指导作用。

This paper studies the damage conditions of TBM disc cutters,the main forms and causes of disc cutter damages and the mechanical mechanism of cutter damages.CSM model was applied to solve the rock breaking load by a cutter,thereby a formula was obtained for the maximum critical penetration when the cutter damaged and a formula for the minimum critical penetration when the cutter can not turn around（partial wear）.Various factors influencing the rock breaking load by cutter and critical penetrations were also analysed.For convenience of field application,curve diagrams and application examples are presented in the paper.The research results show that partial wear of cutter ring and bearing damage are the most common forms of cutter damages in hard rocks and cutter overload is the main cause of cutter damage.In tunneling process,the range of penetration should be adjusted between minimum critical penetration and maximum critical penetration according to the changes of rock strength and cutter wear condition.The research results provide guidelines for TBM construction.