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Cracking analysis on concrete lining of high-pressure diversion tunnel

LIU Minga,b,ZHANG Qinga,b,JIANG Yazhouc,FAN Yingb(a.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering;b.Department of Engineering Mechanics;c.College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)  
To study concrete lining crack problems of high-pressure diversion tunnel,taking the lining as permeable material according to the coupling between seepage field and stress field,the dynamic evolution model of permeability coefficient is established considering the relation between permeability coefficient and volumetric strain,and the location and width of cracks are determined according to the relation between single crack width and equivalent permeability coefficient.The method is applied to the lining cracking analysis of high-pressure diversion tunnel of a second stage hydropower station and the result shows that this method is good at determining the distribution and width of cracks.
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