摘要
湛江某区地下土壤PH值小于3.5,土质情况特殊,根据《岩土工程勘察规范》判定对混凝土材料具有强腐蚀性,但此类土壤的腐蚀机理为微生物腐蚀。当土层透气性差,厌氧的硫酸盐还原菌繁殖,将土层水中的硫酸盐还原为硫或硫化物;但当土层透气性改善时,大部分的硫及硫化物却未被氧化为硫酸。经过多年试验研究发现,此区地下土壤可按对混凝土材料具有弱腐蚀进行判定,即在此区进行永久性建筑时,地下施工部分如果选材合理、施工科学,可以参考土壤对混凝土结构有弱腐蚀性来进行施工,为施工单位减轻工作难度,为建设单位节约资金。
The pH value of a special subsurface soil in Zhanjiang is laboratory tested to be less than 3.5.In accordance with the current Code for Geotechnical Engineering Investigation,it is concluded that this soil is strongly corrosive to underground concrete structures.The further investigation indicates that the corrosion mechanism for this type of soil is microbial induced.When the permeability of soil layer is poor and the anaerobic sulfate reduces bacteria propagate,so that the sulfate in the pore water I the soil is reduced to sulfur or sulfide.When the permeability of the soil layer is improved,most sulfur and sulfide are not oxidized to sulfuric acid.After many years of experiment and research,it is concluded that this special subsurface soil in this area can be classified as weak corrosive soil to the underground concrete structures.In other words,if the selection of underground construction materials and the foundation construction procedures are appropriate,measures used for the weak corrosive soils can result in a significant construction cost saving.
作者
刘笑言
蒋小经
陈明珠
冯治国
LIU Xiaoyan;JIANG Xiaojing;CHEN Mingzhu;FENG Zhiguo(Wuhan Surveying&Geotechnical Research Institute Co.Ltd.,DFMCC,Wuhan 430080;Wuhan Guojian Engineering Testing Co.,Ltd.,Wuhan 430062;Wuhan Zhongdianyou Engineering Service Co.Ltd.,Wuhan 430000)
出处
《土工基础》
2019年第6期701-703,708,共4页
Soil Engineering and Foundation
关键词
酸性土壤
混凝土
强腐蚀
弱腐蚀
Acidic Soils
Concrete Structures
Strong Corrosive Soils
Weak Corrosive Soils
作者简介
刘笑言(1983-),女,工程师,注册土木工程师(岩土),研究方向为勘察设计。
