中国铁道科学2017，Vol.38Issue(3)：55-62,8.DOI:10.3969/j.issn.1001-4632.2017.03.08
泥水盾构开挖面失稳破坏的颗粒流模拟研究
Research on Particle Flow Simulation for Excavation Face Instability of Slurry Shield
摘要
Abstract
Aiming at excavation face stability and ground surface settlement for large-diameter slurry shield driving in sand gravel stratum in Beijing,particle flow code PFC2D was conducted to examine the micro-parameters of particle flow model for sandy cobble ground.Moreover,the friction coefficient and contact modulus of soil particle,the thickness and strength of mud membrane,were used for analyzing and evaluating the effect of tunnel face.Results show that:the friction coefficient and contact modulus of soil particle as well as the thickness and strength of mud membrane have significant influence on the stability of excavation face.The smaller the friction coefficient and contact modulus of soil particle are,the more serious failure of the excavation face is and the larger the boundary of ground collapse becomes,and the deeper ground settlement trough is.When the friction coefficient of soil particle reaches to 2.4 and its contact modulus reaches to 12 × 107 N · m-1,the excavation face tends towards stabilization.Moreover,the curve of settlement trough is flat and the vertical displacement of ground surface is smaller.The smaller the thickness and strength of mud membrane are,the more obvious the extrusion of the excavation face is,which can easily cause a wide range of ground deformation,and directly leading to ground collapse.When the thickness of mud membrane reaches to 20 mm and its strength reaches to 1 400 N · m-1,the stability of excavation face can be ensured during construction.关键词
砂卵石地层/泥水盾构/开挖面稳定/颗粒流细观参数/泥膜/数值模拟/颗粒流程序Key words
Sand gravel stratum/Slurry shield/Excavation face stability/Micro-parameter of particle flow/Mud membrane/Numerical simulation/Particle flow code分类
交通工程引用本文复制引用
王振飞,张成平..泥水盾构开挖面失稳破坏的颗粒流模拟研究[J].中国铁道科学,2017,38(3):55-62,8.基金项目
中央高校基本科研业务费专项资金资助项目(2016JBM042) （2016JBM042）
