基于岩碴流动性的TBM出碴槽口选优设计

研究了在一定开口面积下,TBM刀盘的最优出碴槽布置方式.采用离散元方法(DEM)建立刀盘排碴仿真模型,以出碴槽结构尺寸、数量等参数为变量进行TBM岩碴流动性仿真实验.在出碴槽开口面积相同的前提下,提出了基于岩碴流动性的出碴槽设计规则:1尽可能采用对称式布置;2尽可能使用长、短出碴槽交替布置的方式;3适当减小长出碴槽的开口宽度以提高出碴过程的稳定性.以"引洮"工程为例进行了验证,结果表明,与原出碴槽结构相比,采用改进方案的刀盘的出碴效率和出碴稳定性分别提高了15.08%和11.97%.

Optimum Design of TBM Mucking Slot Based on the Rock Ballasts Fluidity

The optimum design of TBM mucking slot under certain open area was studied. By introducing the discrete element method， we took design parameters of mucking slot and its quantitiess as variables， and made a series of TBM rock ballast liquidity simulation experiments. We proposed a design method of mucking slot providing the same opening area of the cutterhead. First， the design should use the symmetrical arrangement as possible. Second， it should be more rational as long as the arrangement of alternating between long and short mucking slot is used. Third， the width of long mucking slot should be decreased for the stability of discharging ballasts. Take the numerical simulation results of the Yintao project comparing with the original design as an example， the efficiency and stability of discharging ballasts has been increased by 15.08% and 11.97%， respectively.