论文部分内容阅读
地铁盾构隧道通常不可避免地会穿越城市密集的建筑楼群,盾构切桩穿越会对住宅楼的形变产生较大的影响。本文使用TS30测量机器人对深圳某小区的9—13号楼群在盾构切桩穿越过程中进行了实时动态监测。监测结果表明:同一幢建筑物上的监测点变化趋势基本一致,离中线越近,沉降变化越大,反之沉降较小;相同距离切桩数量越多,相应建筑变形越大;刀盘到达监测点正下方切桩时,下沉突然增加,此时下沉速度最快,达1.49 mm/m;刀盘脱离房屋时,下沉继续增加,从刀盘进入房屋到盾尾脱离房屋期间,累计下沉占总沉降量的60%以上;房屋长边上监测点距中线垂直距离大于15 m时,沉降值小于5 mm,可以减少监测布点个数;距离大于30 m时,沉降值小于3 mm,可以不再布设监测点。这些研究可为后期建立盾构隧道不同埋深时与建筑物沉降的函数关系提供数据资料,也为以后盾构切桩穿越既有建筑群变形监测点优化设计提供宝贵实践经验。
Subway shield tunnels usually inevitably cross the densely-populated urban buildings. The shield tunneling will have a significant impact on the deformation of residential buildings. This paper uses the TS30 measuring robot to carry out real-time dynamic monitoring of the 9-13 building complex in a district of Shenzhen during the process of cutting through the shield. The monitoring results show that: the trend of monitoring points on the same building is basically the same, the closer to the midline, the greater the settlement changes, and vice versa; the more the same distance the number of pile cutting, the greater the deformation of the corresponding building; Sinking suddenly increased, the fastest sinking at this time, reaching 1.49 mm / m; knife off the house, the sink continued to increase, from the cutter into the house to shield the tail from the house during the cumulative The sedimentation value is less than 5 mm, the number of monitoring points can be reduced; when the distance is more than 30 m, the settlement value is less than 3 mm, Monitoring points can no longer be laid. These studies can provide data for establishing the functional relationship between shield tunnels and settlement at different depths and provide valuable practical experience for the future design of shield tunneling through deformation monitoring points of existing buildings.