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《Journal of Safety and Environment》 2005-05
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Study on relationship between chemical action of Fe in soil and soil strength in urban region

HAN Li-hua,LIU Song-yu(Institute of Geotechnical Engineering,Southeast University,Nanjing 210016,China)  
The variation of Fe in groundwater of Nanning city is analysed in this paper.Based on a large amount of experimental data,a detailed discussion has been made on the relation between the physical and chemical reactions of Fe to the soil strength.Our analysis results show that the decrease of soil strength is resulted from the corrosion and replacement action of Fe in the soil of the urban areas.Furthermore,the increase of content of CO_2 in air makes the corroding of Fe more seriously,thus,in the end,causing the soil strength deteriorating more quickly.At the same time,negative and positive mechanical effects have also been studied in this paper with the soil strength when the content of Fe in groundwater changes.To be exact,the result reveals that soil strength will fall because of dissolution and transfer of Fe in soil when water content of soil is relatively higher.However,when the water content of soil is rather lower,the deposition and adsorption of Fe in soil would be getting greater,which accounts for the enhancing of soil strength.
【Fund】: 国家自然科学基金资助项目(49662010 59868001)
【CateGory Index】: TU43;
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