砂卵石地层中大断面泥水盾构泥膜形态研究

发布时间：2018-04-27 04:00

本文选题：大断面泥水盾构 + 模型试验　；参考：《现代隧道技术》2014年06期

【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。
[Abstract]:In this paper, taking the tunnel of Nanjing Metro Line 10 over the Yangtze River as the research object, the method of combining discrete element numerical simulation with indoor model test is used to study the sand and pebble strata. The dynamic process of mud film formation, failure and re-formation during the construction of large-section mud water shield tunnel and the scope of mud permeation are discussed. The influence of shield construction on the surrounding environment under different mud pressure conditions is discussed. The results show that the discrete element method can reproduce the dynamic process of mud film in the construction of mud water shield, and in the construction of mud water shield, The selection of mud pressure plays a very important role in controlling the formation deformation and the stability of the face of the face. According to the conditions of sandy pebble formation, the permeable mud film can be formed during the excavation of mud water shield. In the experiment, the final outer curve of the mud membrane is an elliptical pure cone, the maximum rotation radius of the cone is about 0.3 D, the maximum permeable distance of the mud membrane is 0.40. 5 D in front of the shield, and the range of the mud membrane moves forward with the tunneling of the shield.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;
【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)
【分类号】：U455.43;U231.3

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