输电线路沿盾构隧道敷设对既有结构影响研究

Research on Impact of Laying Electric Transmission Lines along Shield Tunnel on Existing Structures

摘要:

输电线路沿既有盾构隧道敷设需解决隧道局部结构改造与结构安全影响等问题。为此，以南京秋藤—望江220 kV 线路工程沿既有南京应天大街长江隧道敷设为例，采用理论分析、数值仿真模拟和现场监测相结合的方法开展研究，提出了隧道结构局部改造方法，给出了输电线路敷设引起的隧道结构变形量计算值，并结合现场实测数据验证了计算结果；研究了线路工程敷设局部结构改造方式、结构安全影响等关键技术。结果表明，输电线路沿既有盾构隧道敷设具有可行性，结构安全影响在合理范围内。

Abstract:

The laying of electric transmission lines along the existing shield tunnels needs to address issues such as local structural reconstruction of the tunnel and the impact on structural safety. Taking the laying of Nanjing Qiutong - Wangjiang 220 kV Transmission Line Project along the existing Nanjing Yingtian Avenue Yangtze River Tunnel as an example, the combined method of theoretical analysis, numerical simulation and on-site monitoring is used to conduct research. A method of local structural reconstruction of tunnel is proposed. The calculation values of tunnel structural deformation caused by laying the electric transmission lines are given. And combined with the on-site measured data, the calculation results are verified. The key technologies such as local structural reconstruction methods for line engineering laying and structural safety effects are studied. The results show that the laying of electric transmission lines along the existing shield tunnels is feasible, and the structural safety effects are within a reasonable range.