摘要
文章以南京地铁十号线越长江隧道为研究对象,采用离散元数值模拟与室内模型试验相结合的方法研究了砂卵石地层条件下,大断面泥水盾构隧道施工过程中泥膜生成—破坏—再生成的动态过程以及泥浆渗透范围,探讨了不同泥水压力条件下盾构施工对周围环境的影响。研究表明,采用的离散元方法能较好地重现泥水盾构施工过程中泥膜的动态变化过程;在泥水盾构施工中,泥水压力的选取对控制地层变形与掌子面稳定性具有十分重要的作用;针对砂卵石地层条件采用试验配置的泥浆,在泥水盾构开挖过程中可以形成渗透性泥膜,试验中泥膜最后形成的外曲线为椭圆的纯圆锥体,锥体最大旋转半径约为0.3D,泥膜最大渗透距离在盾构前方0.4~0.5D处,泥膜范围随着盾构掘进而向前推进。
Taking a river-crossing tunnel on Nanjing Metro Line 10 as an example, a discrete element simulation and model test were carried out to study the formation-damage-reformation process of the slurry membrane, the penetration range of slurry in a sandy cobble stratum, and the influence of shield tunnelling on the ambient envi-ronment under different slurry pressures. The results show that： the discrete element simulation method can re-produce well the dynamic process of the slurry membrane during slurry shield tunnelling, the selection of slurry pressure plays an important role in controlling stratum deformation and working face stability, and a permeable slurry membrane can be formed in sandy cobble stratum using a pure-cone shape with an oval outline and a largest gyration radius of 0.3D. Its largest penetration distance can be 0.4D^0.5D in front of the shield, and the range of the slurry membrane develops with tunnelling.
出处
《现代隧道技术》
EI
北大核心
2014年第6期108-115,153,共9页
Modern Tunnelling Technology
基金
国家973计划(No.2010CB732105)
国家自然科学基金(U1134208
U1361210)
国家科技支撑计划(No.2013BAB10B04)
关键词
大断面泥水盾构
模型试验
离散元
泥膜
砂卵石地层
Large-section slurry shield Model test Discrete element Slurry membrane Sandy cobble stratum
