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《Sichuan Building Science》 2011-06
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Safety influenced by combined action of chloride and cycles of freezing and thawing to shallow highway tunnel

YIN Rongrong1,2,ZHU Hehua 1(1.Dept.of Geotechnical Engineering,Tongji University,Shanghai 200092,China; 2.School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)  
This study,using GeoFBA,generates a load-structure method tensile-compressional model for analyzing and calculating the tunnel that is 10m-depth-embedment surrounding rock Ⅴ and is eroded by combined action of chloride and cycles of freezing and thawing.The calculation indicates that first of all,the tunnel safety falls down gradually with the increase of circumferential crack width(the degree of corrosion of reinforcement) as well as longitudinal crack depth;furthermore,when lining suffers the same corrosion degree of reinforcement and the same depth of longitudinal crack,the problem occurs on the arch crown which would bring up bigger effect to the tunnel safety than that occurs in the haunch;In addition,the change of circumferential crack width,which is smaller than 0.2 mm,would make less influence to the tunnel lining safety.
【CateGory Index】: U451
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