大盾构近距离下穿高压电塔微扰动施工控制技术

Micro-disturbance Construction Control Technology for Large Shield Passing under High Voltage Tower in Close Distance

采用盾构法进行市政轨道交通隧道建设时需尽量降低对周边环境、既有建(构)筑物的不利影响,实现变形微扰动控制。以上海市域铁路机场联络线3标大直径泥水气压平衡盾构机近距离穿越春申塘沿线5#高压电塔为例,针对盾构施工引起的地表及电塔基础变形进行数值分析研究。将整个穿越施工分为3阶段,每个阶段通过控制推进参数、同步注浆、壳体压注克泥效等措施,顺利完成盾构近距离微扰动穿越高压电塔的施工作业。现场监测结果表明:穿越施工过程中推进参数及控制措施满足微扰动施工要求,高压电塔倾斜率控制在-0.1‰~0.14‰,变形稳定可控,为本标段后续电塔的穿越及类似工程提供经验和参考。

In order to realize micro-disturbance control of the deformation,it is necessary to minimize the adverse impact on the surrounding environment and existing buildings during the construction of municipal rail transit tunnel by shield method.Taking the large diameter slurry pressure balance shield machine in Lot 3 of Airport Link of Shanghai City Railway as an example,which passes through the 5#high voltage tower along Chunshen Pound at a short distance.The deformation of ground surface and tower foundation caused by shield construction is numerically analyzed and studied.The whole under-passing construction is divided into 3 stages.In each stage,the construction work of shield tunnel crossing the high voltage tower with short distance and micro disturbance is successfully completed by controlling the advancing parameters,synchronizing grouting,and grouting Clayshock on shield shell.The field monitoring results show that during the under-crossing construction,the advancing parameters and control measures meet the requirements of micro-disturbance construction.The inclination rate of high voltage tower is controlled within-0.1‰~0.14‰,and the deformation is stable and controllable.It will provide experience and reference for the subsequent passing under the tower in this Lot and similar projects.