邻近明挖隧道施工及运营对高压电塔的影响分析

Analysis on Influence of Construction and Operation of Adjacent Open-trench Tunnel on High-voltage Tower

摘要:

以典型工程实例为依托，借助有限元软件建立隧道基坑开挖及运营过程的计算模型，揭示高压电塔对隧道施工和运营影响的力学响应特征。研究表明：基于隧道施工和运营力学扰动特征，高压电塔存在倾斜、整体失稳及局部失稳的风险；隧道基坑开挖产生的最大侧移为8.5 mm，最大沉降为5 mm，整体稳定系数为1.837，符合规范要求，满足整体稳定；隧道开挖、运营诱发的电塔倾斜度为0.011%和0.000 7%，显著小于规范规定的1%限值；新建隧道施工和运营阶段对电塔的影响可控，能保证电塔的安全稳定。考虑到实际施工不可预知的风险，除加强全过程实时监控外，建议在隧道与电塔间设置袖阀管跟踪注浆。

Abstract:

Based on a typical engineering example, the calculation model of the foundation pit excavation and operation of tunnel is established by using finite element software. The mechanical response characteristics of high-voltage tower under the influence of tunnel construction and operation are revealed. This study shows that the high-voltage tower has the risk of tilt, overall instability and partial instability based on the characteristics of mechanical disturbances during the tunnel construction and operation. The maximum lateral displacement generated by the excavation of tunnel foundation pit is 8.5mm, the maximum settlement is 5 mm and the overall stability coefficient is 1.837, which meet the specification requirements and the overall stability. The inclination of the high-voltage tower induced by tunnel excavation and operation is 0.011% and 0.000 7%, which are significantly less than 1% specified in the specification. The influence of the new tunnel construction and operation on the high-voltage tower is controllable, which can ensure the safety and stability of the high-voltage tower. Considering the unpredictable risks in actual construction, it is recommended to set up sleeve valve pipe between the tunnel and the tower for track the grouting in addition to strengthening the real-time monitoring of the whole process.