环北部湾广东水资源配置工程PCCP管线土壤腐蚀性调查分析  

Investigation and Analyses of Soil Corrosion in PCCP Pipeline of Guangdong Water Resources Allocation Project around Beibu Gulf

作　　者：秦永坤 李开岩 张慈沁 李岩[1] 么振东 徐宁[1] 李军[1] QIN Yongkun;LI Kaiyan;ZHANG Ciqin;LI Yan;YAO Zhendong;XU Ning;LI Jun(Nanjing Hydraulic Research Institute,Nanjing 210024,China;Guangdong Yuehai Yuexi Water Supply Co.,Ltd.,Guangdong Zhanjiang 524000,China;Guangdong Hydropower Planning&Design Institute Co.,Ltd.,Guangzhou 510635,China)

机构地区：[1]南京水利科学研究院,南京210024 [2]广东粤海粤西供水有限公司,广东湛江524000 [3]广东省水利电力勘测设计研究院有限公司,广州510635

出　　处：《装备环境工程》2025年第3期105-111,共7页Equipment Environmental Engineering

基　　金：环北部湾广东水资源配置工程复杂环境条件下PCCP管道提质升级关键技术研究专题(Hj422013);复杂环境下PCCP管道阴极保护与智能监测预警成套技术研究(Y418009)。

摘　　要：目的调查分析环北部湾广东水资源配置工程湛江分干线的预应力钢筒混凝土管(PCCP)沿线土壤腐蚀性等级,为PCCP阴极保护设计提供依据。方法通过土壤电阻率、pH值、氧化还原电位、Cl^(-)含量测试,综合评价土壤对钢结构以及混凝土中钢筋的腐蚀性。结果湛江分干线PCCP埋管段土壤绝大部分测点的pH值在4.5~7.3,以弱酸性土壤为主。土壤氧化还原电位普遍在400 mV以上。鹤合段土壤电阻率大部分在100Ω·m以上,合雷段和雷徐段土壤电阻率处于20~50Ω·m的比例显著增加。对于土壤中Cl^(-)含量,鹤合段大部分数值在100 mg/kg左右,合雷段数值在50~450 mg/kg,雷徐段95%以上数值小于250 mg/kg。结论湛江分干线PCCP沿线土壤腐蚀性总体上呈由北向南略为增大趋势,对钢结构的腐蚀性强、中、弱、微4个等级均有,中、强腐蚀等级占比为41%,对混凝土中钢筋的腐蚀性为微、弱腐蚀。The work aims to investigate and analyze the soil corrosion level along Prestressed Concrete Cylinder Pipeline(PCCP)of Zhanjiang Branch of Guangdong Water Resources Allocation Project around Beibu Gulf to provide a basis for the cathodic protection design of PCCP.Parameters such as soil resistivity,pH value,oxidation reduction potential and chlorine ion content were detected to evaluate the corrosion level of soil to steel structure and rebar in concrete.The results showed that the pH value was in a range of 4.5-7.3 for a vast majority of measure points,which implied that most of the soil was weakly acidic.The oxidation reduction potential was generally higher than 400 mV.For the soil resistivity,the majority data of He-He segment was above 100Ω·m,however,a higher proportion of the data in a range of 20-50Ω·m was presented for He-Lei segment and Lei-Xu segment.In addition,most of the soil chlorine ion contents of He-He segment were around 100 mg/kg,and the ones of the He-Lei segment were in a range of 50-450 mg/kg.In special,a proportion of 95% of the chlorine ion contents was below 250 mg/kg for the Lei-Xu segment.In general,the soil corrosion level along PCCP of Zhanjiang Branch shows a slightly increase trend from north to south,involving a fact that the corrosion to steel structure is in the level of high,medium,weak and micro,wherein the proportion of medium and high corrosion is 41%.The level of micro and weak corrosion is exhibited to the rebar in concrete.

关 键 词：水资源配置工程 湛江分干线 PCCP 土壤腐蚀 腐蚀等级 阴极保护 

分 类 号：TG172[金属学及工艺—金属表面处理]