基于盾构机挖掘效率提升的盾构机关键施工参数优化设计

Optimization Design of Key Construction Parameters of Shield Tunneling Machine Based on Improvement of Mining Efficiency

刀盘开口率是刀盘设计的关键参数,是决定盾构机是否稳定高效掘进的关键参数之一。在充分理解刀盘与开挖面相互作用的基础上,针对某地铁的粉砂层土体进行三轴试验应力–应变数值模拟仿真,采用EDEM (Engineering + Discrete Element Method)通用CAE软件进行离散元三轴试验和盾构刀盘不同开口率下的挖掘数值模拟研究,分析了不同开口率对进入土仓土体质量的影响,运用回归分析得出了刀盘开口率、刀盘转速和挖掘面土体进入土舱的效率的函数关系式,最后得出盾构机刀盘设计参数如下:刀盘转速的选择范围为6~8 r/min,刀盘开口率为30%时,刀盘开口率的排土量介于100%~108%之间。

The opening ratio of cutter head is a key parameter of cutter head design and is one of the key parameters to determine whether the shield machine is stable and efficient. On the basis of fully understanding the interaction between the cutter head and the excavation surface, the stress-strain numerical simulation of the triaxial test on the silt soil of a subway is carried out, using the general CAE software EDEM (Engineering + Discrete Element Method), the discrete element triaxial test and the numerical simulation of excavation under different opening rate of shield cutter head are carried out, and the influence of different opening rate on the mass of soil entering the silo is analyzed, based on the regression analysis, the functional relations of the cutter head opening rate, the cutter head rotating speed and the efficiency of the soil mass entering the soil chamber on the excavation face are obtained, when the open ratio of the cutter head is 30%, the discharge of the open ratio of the cutter head is between 100% and 108%.