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《Chinese Journal of Underground Space and Engineering》 2017-03
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Displacement Features of Tunnel Lining Segments Using Image Processing Techniques

Zhu Weijie;Su Wende;Wan Min;Municipality Public Engineering Design Institute of Shanghai Tunnel Engineering Co.Ltd.;  
Taking the shield tunnel segments as a research object,a lining structure experiment was conducted to investigate the deformability and ultimate bearing capacity of the segments subjected to lateral forces before and after reinforced by composite materials.The displacement variations of joints between various segments were investigated by image processing techniques according to the images photographed during the experiment.The particle image velocimetry technique was used to compute the displacement variations of the joints in the concrete tunnel segment at different time and different locations.It shows that before the lining structure was reinforced,the changes of displacements of the joints were relatively small and the displacement variations at both sides were not same,and the position of maximum displacement was the top segment as the loading finished;after the lining structure was reinforced,the displacements at the top segment was also larger than those of the side one,and the cracks propagated as the loading process finished;the variations in magnitude of displacement were the largest,medium,and smallest,respectively at the top,standard,side and bottom segments before and after the lining structure reinforcement;failure occur initially in the connection between the top and side segment;after the lining structure was reinforced,the changes in magnitude and variations of displacement of the joints were smaller than those before the shield tunnel was reinforced;reinforcement with composite materials efficiently enlarged the strength of the segment.The results obtained in the current study may be referable in investigating the failure mechanism of lining structure of tunnel.
【Key Words】: tunnel lining image processing displacement variations
【CateGory Index】: U455.91
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