中国铁道科学2011，Vol.32Issue(5)：71-77,7.
地铁盾构隧道下穿城际铁路地基加固方案安全性分析
Safety Analysis of Foundation Reinforcement Scheme for Shield Tunnel Under-Passing Intercity Railway
摘要
Abstract
When the construction of a certain metro shield tunnel under-passing Shanghai-Nanjing intercity railway was in process in Suzhou, the settlement produced by the conventional grouting foundation reinforcement couldn't meet the requirements of intercity railway. Accordingly, combined with the original reinforcement measures, board-pile composite structure was adopted to strengthen the foundation. Two-dimensional finite element method was adopted for this scheme to analyze the law of ground settlement under different stress release ratio caused by shield tunnel excavation. When the stress release ratio was 30%, the entire settlement of the board-pile composite structure was 3. 9 mm, which met the requirements of post-construction settlement for high-speed ballastless track. However, the strengthening board of the board-pile composite structure would be detached from the soil mass beneath. Consequently, three-dimensional finite element method was used to analyze the static and dynamic stress response of the track structure of high-speed railway. Results show that when the strengthening board is detached from the soil body beneath, the maximum deformation of the rail surface caused by gravity stress is 0. 582 mm, which meets the requirements of track irregularity. Under the action of the maximum train dynamic load, the maximum tensile stress of the track slab and the strengthening board is 0. 93 and 1. 02 Mpa respectively. Both are less than the correction values of the fatigue strength required in the norm. Therefore, during the construction of shield tunnel under-passing railway, the reinforcement measure of board-pile composite structure for the foundation of intercity railway can guarantee operation safety.关键词
地铁施工/盾构隧道/下穿施工/应力释放率/地表沉降/地基加固/疲劳强度Key words
Metro construction/ Shield tunnel/ Under-passing construction? Stress release ratio/ Ground settlement/ Foundation reinforcement/ Fatigue strength分类
交通工程引用本文复制引用
霍军帅,王炳龙,周顺华..地铁盾构隧道下穿城际铁路地基加固方案安全性分析[J].中国铁道科学,2011,32(5):71-77,7.基金项目
苏州市轨道交通2号线科研项目(0908246) （0908246）
