为了对比不同典型全断面岩石掘进机(TBM)刀盘的力学性能,对刀盘倾覆力矩计算模型进行了修正。在理想工况、上软下硬地质和部分刀具磨损3种工况下,计算得到刀盘倾覆力矩的分布情况,并采用有限元法模拟得到刀盘掘进过程中应力分布规律。结果表明:刀盘的径向载荷远小于刀盘倾覆力矩,倾覆力矩对刀盘性能的影响远大于径向载荷;刀盘正面滚刀受载产生的倾覆力矩最大,其次是边缘滚刀,中心滚刀受载产生的倾覆力矩最小;在刀具磨损工况下,A刀盘总倾覆力矩在2 800 k N·m以上,比理想工况下要大7%;星形布局刀盘B的倾覆力矩比螺旋线布局刀盘A小,其力学性能和强度特性优于螺旋线布局刀盘。
At present, disc cutters of a full face rock tunnel boring machine are mostly mounted in the traditional way. Practical use in engineering projects reveals that this installation method not only heavily affects the operation life of disc cutters, but also increases the energy consumption of a full face rock tunnel boring machine. To straighten out this issue, therefore, a rock-breaking model is developed for disc cutters＇ movement after the research on the rock breaking of forward-slanting disc cutters. Equations of its displacement are established based on the analysis of velocity vector of a disc cutter＇s rock-breaking point. The functional relations then are brought forward between the displacement parameters of a rock-breaking point and its coordinate through the analysis of micro displacement of a rock-breaking point. Thus, the geometric equations of rock deformation are derived for the forward-slanting installation of disc cutters. With a linear relationship remaining between the acting force and its deformation either before or after the leap breaking, the constitutive relation of rock deformation can be expressed in the form of generalized Hooke law, hence the comparative analysis of the variation in the resistance of rock to the disc cutters mounted in the forward-slanting way with that in the traditional way. It is discovered that with the same penetration, strain of the rock in contact with forwardslanting disc cutters is apparently on the decline, in otherwords, the resistance of rock to disc cutters is reduced. Thus wear of disc cutters resulted from friction is lowered and energy consumption is correspondingly decreased. It will be useful for the development of installation and design theory of disc cutters, and significant for the breakthrough in the design of full face rock tunnel boring machine.
