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《Hydrogeology & Engineering Geology》 2015-03
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Dislocation variations in tunnel segments in lining structure experiments using image processing techniques

WU Hongbin;XU Jinming;LIU Damou;Department of Civil Engineering,Shanghai University;China Geo-Engineering Corporation;  
With the development of shield tunnel techniques,the problems such as segment crack,difficulty in connection,and hidden water danger become more serious and obvious in practice. These problems may directly affect the safe-construction and normal-usages. In order to investigate the dislocation variations in the shield tunnel segments subjected to the lateral force,a lining structure experiment was conducted. After introducing the experimental processes,including loading apparatuses,loading processes,and monitoring techniques,dislocations of joints between various tunnel segments before and after reinforcement with composite materials were investigated using the image processing techniques for the images photographed during the experiment. The particle image velocimetry technique was used to compute the dislocation features of the concrete tunnel segments at different times. The results shows that before the lining structure was reinforced,the dislocations were the largest,medium,and smallest,respectively,in the top-side,sidestandard,and standard-bottom segments; after the reinforcement of the lining structure,the dislocation were smaller,similar, and greater, respectively, in the top-side, side-standard, standard-bottom segments,whereas the changes in magnitude and variations in displacement of composite materials were the largest,medium, and smallest, respectively, in the top-side, standard-bottom, side-standard segments; the displacement of composite materials was mainly caused by the equipment vibration. The results in the current study may provide references in investigating the failure mechanism of the lining structure of tunnel.
【CateGory Index】: U455.43
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