水下隧道穿越管道保护效果测试评价

Testing and Evaluation of Cathodic Protection Effect on Underwater Tunnel Crossing Pipeline

本文通过对四川气田北干线涪江隧道穿越管道阴极保护电参数的现场测试，取得了实际可信的基础数据，验证了处于水下隧道洞内的穿越段管道，能得到陆上强制电流阴极保护系统的有效保护，保护电流所必经的岩石层和锚喷钢筋混凝土层对保护电流没有构成屏蔽的结论，对管道工程设计和运行管理具有指导作用。

The actual and believable basic data are acquired through field measurement of cathodic protection electrical parameters on the gas pipeline underwater crossing Fujiang River tunnel in Sichuan gas field. It is verified that the crossing pipeline inside underwater tunnel has been effectively protected by the land impressed current cathodic protection system and no protection current is shielded by the rock and the anchored reinforced concrete. The evaluation result will play a significant role in the pipeline engineering design and operation management.