地下输水管道阴极保护实验分析

Analysis on experiment of cathodic protection for underground water conveyance pipeline

辽宁省大伙房水库输水（二期）工程PCCP管线长154．4km，根据对管线经过地区的土壤和地下水环境调查得知，土壤电阻率大部分在20～50Ω·m之间，部分地段氯离子含量偏高（〉150mg／L），属于中等腐蚀环境，阴极保护设计也差别很大。为此，在全面开工以前进行阴极保护实验，为地下预应力混凝土输水管道阴极保护工程设计提供科学依据。

The length of the PCCP pipeline of the Water Conveyance Project of Dahuofang Reservoir （ Phase Ⅱ） is 154.4 km, and it is known from the investigation made on the soil and underground water environment of the region the pipeline passed through that the most part of the soil resistivity therein is between 20 ~ 50 f~ ~ m with a higher chlorine ion content in part of the region, which is a moderate corrosion environment, and then the difference of the cathodic protection design is larger as well. Therefore, an experiment on the cathodic protection is made before beginning of the whole construction project, so as to provide a scientific basis for the design of cathodic protection for the PCCP pipeline.