【摘要】 随着盾构技术的快速发展,越来越多的盾构隧道穿越敏感环境,由于盾构隧道施工条件复杂,施工过程中难免会产生地层扰动,从而导致地表产生沉降,严重的还会造成周边建(构)筑物破坏。因此,地铁隧道在穿越高密集棚户区等沉降敏感区时,有效控制施工沉降尤其重要。以武汉地铁8号线一期工程,黄浦路站—徐家棚站区间盾构下穿高密度棚户区项目为工程依托,对施工过程中超大直径泥水盾构穿越无加固条件沉降敏感带扰动控制技术进行研究,在简要分析工程背景及重难点基础上,通过对掘进参数的优化,掘进前建筑物评估及试掘进等过程时时监控,做到施工过程中切口水压力、掘进速度、刀盘扭矩等的精细调控;泥膜控制、二次注浆等关键技术的实施,确保了掘进顺利进行,掘进过程参数控制可为分析大直径盾构下穿老旧棚户区施工控制提供参考和依据。更多还原

【Abstract】 With the rapid development of shield technology,more and more shield tunnels pass through sensitive environments. Due to the complicated construction conditions of shield tunnels,stratum disturbances will inevitably occur during the construction process,resulting in settlement on the surface and serious damage to surrounding buildings.Therefore,it is especially important to control the construction settlement effectively when the subway tunnel passes through settlement sensitive areas such as high-density shantytowns. The project of Wuhan Metro Line 8 project,Huangpu Road Station to Xujiapeng Station tunneling through high-density shantytown project was taken as the project support.The perturbation control technology of super-large diameter mudwater shield in the construction process was studied. On the basis of a brief analysis of the engineering background and the difficulties,the article optimizes the excavation parameters,including the pre-excavation building evaluation and the excavation process,so as to achieve the final adjustment of the cutting water pressure,the excavation speed and the cutter head torque during the construction process. The implementation of key technologies such as mud membrane control and secondary grouting ensured the smooth progress of excavation. The parameter control of excavation process provides reference and basis for analyzing the construction control of large-diameter shields under the old shantytown.更多还原