【摘要】 针对采用洞桩法施工的北京地铁10号线工体北路站,介绍了浅埋大跨洞桩隧道的变形监测与控制措施。根据监测数据,对洞桩法隧道导洞开挖,主体扣拱的拱顶沉降与洞周收敛以及地表和上部立交桥基础的沉降变形规律进行了分析研究。结果表明:1)采用洞桩施工方法能有效控制浅埋大跨隧道地表沉降和地层变形;2)隧道埋深和跨度、导洞开挖对浅埋大跨洞桩隧道变形影响显著;3)设置超前小导管注浆,及时施作初期支护和二衬,可以有效的控制变形的发展。更多还原

【Abstract】 Deformation monitoring and control measures of a shallow-buried large-span tunnel constructed using the pile-beam-arch(PBA) method are described,taking the North Gongti Road Station of Beijing Metro line 10 as an example.Based on the monitoring datum,the crown settlement,convergence,ground settlement of the tunnel and the bridge foundation settlement are analyzed.The results show that(1) the PBA tunneling method can restrain the ground settlement and deformation of a shallow-buried large-span tunnel;(2) the depth,tunnel span and pilot tunnel construction may influence the deformation of a shallow-buried large-section tunnel significantly;and,(3) advanced conduit grouting,timely preliminary support and permanent lining construction can reduce the deformation effectively.更多还原