大型TBM盘形滚刀回转切割破岩特性试验研究

A Large-Scale Rotatory Cutting Test on the Rock Breakage Characteristics of TBM Disc Cutter

摘要: 依托福州地铁4号线一期工程，开展岩盘直径为3.2 m的大型TBM滚刀回转切割破岩试验。综合考虑刀盘旋转速度、贯入度及切割半径的影响，对滚刀回转破岩特性进行研究。试验结果表明：转速对破岩三向力的影响最小，切割半径次之，贯入度的影响最大，故现场可通过适当增加转速来提高推进效率；法向力和切向力随切割半径变化不大，侧向力随着切割半径的增加而减小；单圈破岩所需能量随切割半径及贯入度的增加而增大，但存在一个最优的贯入度3 mm，使得单位破岩所需的能量最小。研究成果可为福州地铁4号线一期工程刀盘设计及施工参数的设定提供参考依据。

Abstract: Based on the first stage project of Fuzhou Metro Line 4, a series of rotatory cutting tests were performed on a rock specimen with a diameter of 3.2 m. The rock breakage characteristics subject to rotatory cutting were explored by comprehensively considering the influences of revolution speed, penetration depth and cutting radius. The experimental results show that the influence of revolution speed on the three-dimensional cutting forces is the least, the influence of cutting radius is the secondary and the influence of penetration is the largest. Therefore, it may be applicable to enhance the advancing efficiency by increasing the revolution speed to an appropriate value. The normal and tangential forces do not vary obviously with the cutting radius, but the side force decreases as the cutting radius increases. The energy required for rock breakage in a single cutting round increases with increasing cutting radius as well as increasing penetration depth. There exists an optimal penetration depth of 3mm, which leads to the lowest energy required for rock breakage per unit volume. The observations can provide useful guidance on the design of cutterhead and selection of construction parameters for the first-stage project of Fuzhou Metro Line 4.