使用图像分析研究隧道衬砌管片的位移变化

发布时间：2018-04-08 17:28

本文选题：隧道衬砌　切入点：图像处理　出处：《地下空间与工程学报》2017年03期

【摘要】：以复合材料加固前后的盾构隧道管片为对象,进行了盾构隧道管片在侧向荷载作用下变形能力和极限承载力的整环加载试验,使用图像处理技术对加固前后衬砌圆环管片接缝两侧的位移变化进行了研究。根据加载过程中不同时刻的试验图像,使用粒子图像测速技术得到了不同时刻、不同位置接缝两侧混凝土管片的位移变化情况。结果表明:未加固阶段管片顶部接缝处管片表面位移相对较小,两侧位移变化不相等,封顶块位移大于邻接块位移,加载结束时最大位移发生在封顶块位置;整环加固后,封顶块位移大于邻接块位移,加载结束时裂缝开始扩展;加固前后位移变化幅度大小次序依次是封顶块、标准块、邻接块和底块,破坏最先发生位置是封顶块和邻接块的连接位置;使用复合材料加固后,各处接缝两侧管片位移变化幅度及整体位移变化量均小于加固前,管片承载力增加,强度明显提高。本文结果对研究隧道衬砌破坏机理有一定的参考价值。
[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.
【作者单位】：上海隧道工程股份有限公司市政公用设计研究院;
【分类号】：U455.91

【相似文献】