基于计算流体动力学的盾构刀盘开挖面土体分析

针对土压平衡盾构掘进过程中土体、刀盘及土舱控制等复杂的耦合作用关系,利用经改良的切削渣土的"塑性流变状态",建立了包括土体、刀盘、土舱和螺旋输送机在内的CFD模型,研究了刀盘开口率和埋深等因素对刀盘开挖面土体压力及速度分布规律的影响.建立了土体压力及其速度分布的拟合数学模型,揭示了刀盘拓扑结构特征对掘进过程的重要影响.利用实际工程掘进数据对比验证了CFD模型计算结果的正确性与方法的可行性,可对高效、稳定掘进的刀盘拓扑结构的优化设计提供分析支持.

Analysis of Soil of Excavation Face with Shield Cutter Head Based on Computational Fluid Dynamics

Given the complex coupling effect of soil, cutter head and controlling of sealed cabin during earth pres-sure shield tunneling, by using the plastic fluidity of modified cutting soil, the CFD model, including soil, cutter head, sealed cabin and screw conveyor, was established for analyzing the soil of excavation face with earth pressure shield cutter head. The effects of opening ratios of cutter head and buried depths on the pressure and velocity distribu- tions of excavation face with earth pressure shield cutter head were studied, and the fitting mathematical model of the distributions was proposed. And the big influence of the structure of EPB shield cutter head on tunneling progress was revealed. The simulation results of the CFD model were compared with field data, and the feasibility of the simula-tion method was verified. The conclusions provide an analytical support for optimizing the structure of EPB shield cutter head to realize more efficient and steady tunneling.