摘要
辽河三角洲地区地下水化学组分复杂,对地下工程材料具有显著腐蚀风险。基于辽河三角洲地区地下水质实测数据,依据《岩土工程勘察规范》综合评价浅层地下水对混凝土及钢筋的腐蚀性特征。结果表明,研究区地下水对混凝土的腐蚀性主要由硫酸盐(SO_(4)^(2-),最高为2 353.47 mg/L)、矿化度(最高为52 444.25 mg/L)及环境pH值(7.0~8.1)控制。其中,SO_(4)^(2-)含量在环境类型II中达300~1 500 mg/L时判定为弱腐蚀(占25%),局部区域(#18、#20站位)因SO_(4)^(2-)含量>1 500 mg/L且矿化度>50 000 mg/L,腐蚀性升至中等级别(占10%)。弱透水层中侵蚀性CO_(2)(<1.60 mg/L)与近中性微环境(pH≈7.1)协同作用,进一步加剧了混凝土的腐蚀性;Cl^(−)(最高为29 246.25 mg/L)与SO_(4)^(2-)(最高为2 353.47 mg/L)协同作用导致局部区域(#18、#20站位)钢筋腐蚀达中等级别(占15%),偏酸性微环境(pH≈7.1)进一步加剧侵蚀进程。针对腐蚀风险空间分布特征,提出分区防控策略,包括采用抗硫酸盐水泥基复合材料、复合阻锈技术及高密实度施工工艺,并强化低温湿养护与防护涂层应用。研究成果可为类似滨海区域地下工程耐久性设计与腐蚀防控提供理论支撑。
Groundwater in the Liaohe River Delta in Liaoning,NE China exhibits a complex chemical composition,posing significant corrosion risks to underground engineering materials.Based on water quality data from the delta region and guided by the Code for Geotechnical Engineering Investigation(China National Standard No.GB 50021—2001),the characteristics of corrosivity by the shallow groundwater in the delta region on local concrete and steel reinforcement.Results indicate that the corrosiveness of groundwater to concrete in the study area was primarily controlled by sulfate(SO_(4)^(2-),up to 2353.47 mg/L),total dissolved solids(TDS;up to 52444.25 mg/L),and environmental pH(ranging from 7.0 to 8.1).In the Type Ⅱ Environment of China,groundwater with SO_(4)^(2-)concentrations between 300 and 1500 mg/L is classified as weakly corrosive,thus 25%of the samples felt into this category.In some local areas(stations#18 and#20),where SO_(4)^(2-)concentrations exceeded 1500 mg/L and TDS level was above 50000 mg/L,the groundwater was bracketed into moderately corrosive,representing 10%of the samples.Additionally,the combined effect of erosive CO_(2)(<1.60 mg/L)and a near-neutral microenvironment(pH≈7.1)within weakly permeable strata further intensified the corrosion to the concrete.The synergistic effects of Cl^(−)(up to 29246.25 mg/L)and SO_(4)^(2-)(up to 2353.47 mg/L)lead to moderate corrosion to the steel reinforcement in local areas(e.g.,Sites#18 and#20,15%of the total area),and the local weakly acidic microenvironment(pH≈7.1)further accelerated the degradation.To address the spatial distribution of corrosion risks,zoned prevention strategies were proposed,including the use of sulfate-resistant cement-based composite materials,composite anti-corrosion techniques,high-density construction processes,and enhanced low-temperature wet curing combined with protective coatings.The findings provided a theoretical support for durability design and corrosion prevention in underground engineering projects in similar coastal regions.
作者
王吉松
丁杲
丁喜桂
叶思源
黄小慧
WANG Jisong;DING Gao;DING Xigui;YE Siyuan;HUANG Xiaohui(China Coal Guanghua Geological Engineering Co.,Ltd.,Handan 056004,China;Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266237,China;Cangnan County Natural Resources and Planning Bureau,Wenzhou 325899,China)
出处
《海洋地质前沿》
北大核心
2026年第1期87-94,共8页
Marine Geology Frontiers
基金
国家自然科学基金区域创新发展联合基金重点项目(U22A20558)
崂山实验室科技创新项目(LSKJ202204400)
中国地质调查局项目(DD20189503,DD20221775,GZH201200503)
山东省自然科学基金(ZR2023MD060)
海洋负排放国际大科学计划(ONCE)。
关键词
辽河三角洲
地下水
腐蚀性评价
混凝土腐蚀
钢筋腐蚀
Liaohe River Delta
groundwater
corrosion assessment
concrete corrosion
reinforcement corrosion
