电力盾构隧道近距离下穿地铁结构变形控制技术

Deformation Control Technology of Power Shield Tunnel ThroughSubway Structure at Short Distance

福州220kV东台-盖山线路缆化工程电力盾构隧道近距离下穿福州地铁1号线车站出入口,最小净距为1.77m,下穿施工风险高,从完善施工准备、加强对土压力、注浆、盾构姿态、推进速度等方面的控制,并结合变形监测数据对盾构掘进参数进行动态调整,理论研究加实践反馈优化相结合的方式,控制地铁结构变形在允许范围,确保盾构施工及邻近地铁结构物的安全。

The power shield tunnel of Fuzhou220 kV Dongtai-Gaishan LineCable Engineeringthrough the entrance and exit of Fuzhou Metro Line 1 at a short distance.It has a minimum net distance of 1.77m and a high risk of underpass construction.This paper improves the construction preparation,strengthens the control of earth pressure,grouting,shield posture,propelling speed,and dynamically adjusts shield driving parameters with deformation monitoring data.By combining theoretical research with practical feedback optimization,the deformation of subway structure can be controlled within the allowable range to ensure the safety of shield construction and adjacent subway structures.