本文選題：隧道襯砌　切入點：圖像處理　出處：《地下空間與工程學(xué)報》2017年03期

【摘要】：以復(fù)合材料加固前后的盾構(gòu)隧道管片為對象,進行了盾構(gòu)隧道管片在側(cè)向荷載作用下變形能力和極限承載力的整環(huán)加載試驗,使用圖像處理技術(shù)對加固前后襯砌圓環(huán)管片接縫兩側(cè)的位移變化進行了研究。根據(jù)加載過程中不同時刻的試驗圖像,使用粒子圖像測速技術(shù)得到了不同時刻、不同位置接縫兩側(cè)混凝土管片的位移變化情況。結(jié)果表明:未加固階段管片頂部接縫處管片表面位移相對較小,兩側(cè)位移變化不相等,封頂塊位移大于鄰接塊位移,加載結(jié)束時最大位移發(fā)生在封頂塊位置;整環(huán)加固后,封頂塊位移大于鄰接塊位移,加載結(jié)束時裂縫開始擴展;加固前后位移變化幅度大小次序依次是封頂塊、標(biāo)準(zhǔn)塊、鄰接塊和底塊,破壞最先發(fā)生位置是封頂塊和鄰接塊的連接位置;使用復(fù)合材料加固后,各處接縫兩側(cè)管片位移變化幅度及整體位移變化量均小于加固前,管片承載力增加,強度明顯提高。本文結(jié)果對研究隧道襯砌破壞機理有一定的參考價值。
[Abstract]:The deformation capacity and ultimate bearing capacity of shield tunnel segments strengthened with composite material under lateral load were tested.The change of displacement on both sides of the joint of annular segment of lining before and after reinforcement was studied by image processing technique.According to the experimental images at different times in the loading process, the displacement changes of concrete segments on both sides of joints at different times and different positions were obtained by using particle image velocimetry.The results show that the surface displacement of the segment at the top joint of the segment is relatively small, the displacement of both sides is not equal, the displacement of the top block is larger than that of the adjacent block, and the maximum displacement at the end of loading occurs in the position of the seal block.The displacement of the top block is greater than that of the adjacent block, and the crack begins to expand at the end of loading, and the order of displacement changes before and after reinforcement is the top block, the standard block, the adjacent block and the bottom block.The first location of failure is the connecting position of the top block and adjacent block. After the composite material is used, the displacement change range and the whole displacement change of the two sides of the joints are smaller than those before the reinforcement, and the bearing capacity of the segment increases and the strength increases obviously.The results of this paper have some reference value for studying the failure mechanism of tunnel lining.
【作者單位】： 上海隧道工程股份有限公司市政公用設(shè)計研究院;
【分類號】：U455.91

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