软硬不均地层对盾构刀盘受力计算方法与分析

盾构掘进软硬不均地层过程中刀盘承受偏载、应力集中等非均布荷载，引起刀盘局部损伤、刀具异常磨损等问题，特别是超大直径刀盘受力不均现象更加显著。针对上述问题，重点考虑软硬不均地层承载力容许值、面积比两个主要特征变量，提出了一种盾构掘进软硬不均地层的刀盘受力计算方法。依托某超大直径盾构隧道工程，利用该方法计算出软硬不均地层对刀盘作用力，结合数值仿真方法进一步得到刀盘整体应力与应变分布规律，进而提出了刀盘过载的刀盘总推力合理值。该计算方法不仅反映了软硬不均地层与刀盘刀具耦合作用特征，而且方便进一步计算刀盘整体应力与应变分布情况，确定刀盘推力，避免刀盘局部受力过大。

Calculation Method and Engineering Application of Force on Shield Cutter Disk for Soft and Hard Composite Stratum

In the process of shield tunneling soft and hard inhomogeneous stratum, the cutter plate is subjected to non-uniform load such as bias load and stress concentration, which causes local damage to the cutter plate and abnormal tool wear, especially the uneven force phenomenon of the oversized diameter cutter plate is more significant. In view of the above problems, a method of calculating the cutter disc forces for shield tunneling in soft and hard composite strata is proposed by focusing on two main characteristic variables, namely, bearing capacity tolerance value and area ratio of soft and hard composite strata. Based on a very large diameter shield tunnel project, the method is used to calculate the force of soft and hard composite strata on the cutter disk, and further obtain the overall stress and strain distribution law of the cutter disk combined with numerical simulation method, and then propose a reasonable value of the total cutter disk thrust for overloading the cutter disk. The calculation method not only reflects the characteristics of the coupling action between the soft and hard composite strata and the cutter tool, but also facilitates further calculation of the overall stress and strain distribution of the cutter, determines the cutter thrust, and avoids excessive local force on the cutter.