摘要
为研究在砂卵石地层掘进过程中盾构刀盘上不同间距先行刀耕松前方土体的机理,文中基于二维离散单元法,通过PFC2D颗粒流软件建立了先行刀切入土体的仿真模型,并设计了多组实验模拟出刀具前方的接触力链走向及变化过程;根据刀具间土体颗粒接触力的变化,总结归纳出了三种典型的土体耕松模式,三种耕松模式可根据切深和间距不同相互转化,耕松土体面积也因耕松模式的变化而改变;提出了耕松效率的概念,结合相关参数的比较,选择出了最优刀间距。
In order to understand the mechanism of soil plough-loosening by shield cutters under different cutter spacings in a sandy cobble stratum, a simulation model of soil plough-loosening by the cutters was established with PFC2D grain-flow software based on the 2D discrete-element method and several sets of experiments were designed to simulate the contact force chain and variation process in front of the cutter. Three typical types of plough-loosening modes were identified. These modes are interchangeable upon different cutter spacing and cut depth, and the plough- loosening area varies with the plough-loosening mode. This paper introduces the concept of plough-loosening efficiency. The optimum cutter spacing is given based on a comparison of the plough-loosening efficiencies
出处
《现代隧道技术》
EI
北大核心
2013年第1期109-114,共6页
Modern Tunnelling Technology
关键词
盾构刀具
颗粒流
数值模拟
耕松模式
Shield machine
Cutter
Grain flow
Numerical simulation
Plough-loosening modes
