大直径盾构施工主要问题及勘察技术措施

Main Questions and Geotechnical Investigation Measures for Large Diameter Shield Construction

某市政改造工程入地段隧道拟采用直径15.5m的盾构施工,沿线地段穿越地表水体、地铁区间、铁路、地下管线及建筑物和构筑物等多处地质环境风险点,施工对地层扰动大,沉降控制难度大。通过对大直径盾构施工所涉及到的主要问题进行分析,提出针对性勘察技术措施,为大直径盾构选型及施工提供相应的技术参数与地质依据。

The underground part of some municipal renovation project is a large section highway tunnel,which plans to use a large diameter shield with the diameter of 15.5 meter.The tunnel travels many geological environment risk points such as surface water,metro inter-station,railway,underground pipelines and buildings.The tunnel disturbs the stratum strongly and the subsid-ence control is difficult.The article has a detailed analysis of main questions and geotechnical investigation measures of large diame-ter shield construction,providing technical suggestions for large di-ameter shield construction being finished on time and high quality,proving reference case for similar large diameter shield construc-tion in the future.