模拟盾构掘进过程中的刀盘受力研究

An Experimental Study of Cutting Resistance in Simulated Shield Tunneling

为了探索盾构掘进机刀盘的掘进机理和刀具受力特点,依据实际土压平衡盾构机的基本结构,按比例缩小设计了模拟盾构刀盘掘进实验装置,并在不变刀具外形的前提下,研制了刀具与传感一体化的刀具传感器。该装置既可测量刀盘轴向推力、扭矩也可测量刀具切削阻力。实验证明了所研制的刀具传感器的有效性,具有挖掘和监测挖掘时的切削阻力双重功能,且解决了切刀中多个力耦合问题,能够分别测量切刀的切削力和轴向阻力。实验结果显示刀具的切削阻力和轴向阻力随所在位置半径增大而增大,且两者基本成线性关系。

In order to investigate the tunneling mechanism of cutter head and force characteristics of cutters in shield tunneling machine,a scaled-down experimental apparatus of simulated shield tunneling was developed,based on earth pressure balance shield.A cutter sensor was also developed,which is mounted inside the cutter and can measure both cutting resistance force and axial resistance force.The functions of the apparatus are to measure axial thrust,torque of cutter head and resistance forces acted on the cutters,respectively.The validity of the cutter sensor that can measure the cutting resistance force and axial resistance force without coupling between them was demonstrated by experiments.Experimental results indicate that the cutting resistance and axial resistance force of cutter increase linearly with the increase of the radius of cutter location.