采用轻质填料填筑路堤对其下方盾构隧道的影响研究

在城市已运营盾构隧道附近建设新的工程,是城市建设中越来越难以避免的课题。无论在盾构隧道上方加载或者卸载,都将对盾构隧道的结构受力和安全运营产生长期的影响。针对此问题,在填筑路堤时,提出先挖方,后采用轻质填料等荷载置换法,解决填筑路堤施工对盾构隧道的影响这个问题。在分析过程中,以实际工程为依托,采用Plaxis有限元软件建立路基-隧道-土耦合模型,考虑位移、超孔水压力等方面,研究了路基施工对地铁盾构隧道的影响,并分析变形规律,得到相应的结论。其成果可为同类工程起到参考作用。

Study on Influence of Using Light Padding to Fill Embankment on Shield Tunnel beneath It

Aiming at the local aggregate and mineral powder used for the steel deck pavement of Maputo Bridge in Mozambique, the NIKON LV100POL-type polarizing microscope is firstly used to identify the mineral content and lithology of aggregate and mineral powder, and the acid-base properties are detected by the content of SiO2. And then the specifications and the basic properties of aggregates and mineral powder are detected and analysed according to the local standards, and the proportioning design and performance verification of SMA10 and GA10 asphalt mixtures are carried out. The results show that the local aggregate of Maputo Bridge is the almond-shaped iron pyroxene basalt. The alkaline and the specifications as well as various indexes of the aggregates and mineral powders can meet the requirements of steel deck pavement. The asphalt mixture through the proportioning design can be directly used for the pavement construction.