大直径泥水盾构下穿机场的施工控制

 上海仙霞西路隧道穿越虹桥机场绕滑道工程采用直径?11.58 m泥水盾构施工。通过分析盾构穿越的风险，给出相应的控制措施。在盾构正式穿越前，通过现场推进试验研究盾构施工参数的调控规律，指导盾构穿越的施工参数设置，最终沉降达到了机场滑道的控制要求。为解决穿越飞行禁区对地表沉降监测范围和频率的限制，采用非开挖技术设置地层水平测斜监测断面，该方法可以及时、准确地了解盾构推进对上方土体的扰动情况。监测数据分析表明非开挖水平测斜监测方法可以在飞机不停航条件下反映盾构穿越机场的土体变形规律，通过该方法可避免监测对机场运营的干扰，对类似工程有重要借鉴意义。

CONSTRUCTION CONTROL OF LARGE DIAMETER SLURRY SHIELD UNDERCROSSING AIRPORT

Slurry shield with outer diameter of 11.58 m was used in Shanghai West Xianxia road tunnel which was undercrossing the taxiway of Hongqiao airport.Through the risk analysis of shield crossing construction,the corresponding control measures were given.Before advancing of the shield machine,the control rules of construction parameters of tunnel shield were studied through field driving test,which provided the guidance for construction parameters settings during shield advancing;finally,the settlement value met the control standard requirement of airport taxiway.In order to solve the limitation in terms of monitoring space and frequency on ground settlement in flight forbidden zone,the horizontal inclinometer monitoring method is applied by using trenchless technology,through which monitors could know the accurate disturbance of soil above the shield in time.The monitoring data show that horizontal inclinometer monitoring by trenchless method can indicate the deformation rules of soil layers when the shield is undercrossing the airport without flights stopping.This kind of monitoring method avoids the disturbance to the airport operation,which is significant to the similar projects.