研究目的:针对铁路隧道拱顶出现衬砌脱空和厚度不足等病害问题,提出一种安全实用、质量可靠的“开窗”凿除不合格衬砌后模筑补强衬砌的病害整治技术。通过数值分析和现场监测对“开窗”凿除和模筑补强施工过程衬砌结构承载稳定性进行研究,开展不同控制指标的衬砌结构影响分区。
研究结论:(1)隧道拱部二衬“开窗”凿除模筑补强施工会造成竖向/水平位移增大,开窗处会出现较大的位移差,在开槽的边缘位置出现较大应力集中;(2)通过变形和应力控制准则揭示了不同开槽大小的影响分区,综合影响分区结果得到:在开槽环向超过3.0 m或纵向超过3.5 m时结构承载力下降,尤其是衬砌拉应力表现更为明显;(3)建议在隧道病害整治开槽过程中,拱部“开窗”环向超过3 m或纵向超过3.5 m时,应加强施工过程应力和应变监测,确保施工安全;(4)本研究成果可应用于铁路隧道拱部病害整治工程领域。
Abstract
Research purposes:Aiming at the problems of lining void and insufficient thickness in the vault of railway tunnel, this paper puts forward a safe, practical and reliable treatment technology of "opening window" chiseling and reinforcing the defects. Through numerical analysis and field monitoring, the bearing stability of lining structure in the process of "window opening" chiseling and formwork reinforcement construction is studied, and the influence zones of different control indexes on lining structure are carried out.
Research conclusions:(1) The vertical / horizontal displacement of tunnel arch cavity will increase suddenly, the displacement difference will be larger and the stress concentration will appear at the edge of the slot. (2) The different influence zones can be obtained by deformation and stress control criteria, and the comprehensive influence zoning results show that the bearing capacity of the structure decreases when the circumferential direction of the slot is more than 3 m or the longitudinal direction is more than 3.5 m, especially the tensile stress of the lining is more obvious. (3) It is suggested that stress and strain monitoring during construction should be strengthened when the arch "window opening" is more than 3 m in circumferential direction or 3.5 m in longitudinal direction, so as to ensure construction safety. (4) The research results can be applied to the field of railway tunnel arch disease treatment engineering.
关键词
铁路隧道 /
拱顶脱空/厚度不足 /
整治技术 /
数值模拟 /
现场监测
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Key words
railway tunnel /
vault void / insufficient thickness /
regulation technology /
numerical simulation /
field monitoring
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中图分类号:
U45
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