刀盘作为全断面岩石隧道掘进机(Full Face Rock Tunnel Boring Machine,TBM)的直接开挖部件,承受刀具破岩的全部载荷,其强度可靠性是评价TBM刀盘性能的重要指标.受复杂地质条件及刀岩相互作用机制的影响,刀盘在掘进过程中承受的载荷具有很强的随机性,故在单一特定工况下研究刀盘的强度性能已无法满足工程需求.鉴于此,本文建立一套随机载荷作用下TBM刀盘强度可靠性的分析方法.基于刀盘-岩石耦合计算模型获取掘进过程中刀具的破岩载荷;对破岩载荷进行统计分析,得到其分布特性及对应参数,并以此为依据构造刀具破岩的随机载荷,采用蒙特卡罗法对刀盘强度的可靠性进行分析.结果表明:安装半径最大的两把正滚刀的破岩载荷对刀盘强度失效的影响最为显著,其权重可达2/3;在常规岩层下高速施工或在硬岩地层维持正常开挖速度,都将显著降低刀盘的强度可靠性.研究结果可为刀盘的地质适应性设计及TBM施工参数控制提供参考.
Analysis of Strength Reliability for TBM Cutterhead Based on Numerical Simulation
As a direct excavation component of Full Face Rock Tunnel Boring Machine(TBM),the cutterhead bears the full load during the rock breaking.Its strength reliability is an important index for evaluating the performance of TBM cutterhead.Under the influence of complex geological conditions and the mechanism of cutter-rock interaction,the load borne on the cutterhead in the process of excavation is highly variable.Therefore,the strength performance of the cutterhead can meet the engineering requirements under a single specific working condition.To address this issue,we developed a systematic method for analyzing the strength reliability of the TBM cutterhead under random loads.Employing the cutterhead-rock interaction model,the rock breaking load of the cutterhead is obtained during the tunnelling process,which is then statistically analyzed to get its distribution characteristics and corresponding parameters.Subsequently,the random load is constructed based on the distribution parameters,and the strength reliability of the cutterhead is analyzed by Monte Carlo method.The results show that the rock-breaking loads on the two cutters situated at the outer edge are pivotal in determining the strength failure of cutterhead,accounting for up to 2/3 of the total weight.Moreover,high-speed construction in conventional rock formations or maintaining the normal excavation speed in hard-rock formations will significantly reduce the strength reliability of the cutterhead.These findings can provide a reference for the geological adaptive design of cutterhead and the control of TBM tunnelling parameters.
TBM cutterheadrandom loadMonte Carlo methodstrength reliabilitynumerical simulation
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