摘要
为了更好地分析碳纤维筋对隧道衬砌的加固效果,以南瓦隧道工程为依托,借助有限元软件ANSYS对衬砌不同病害部位及不同裂缝深度的加固方案进行数值模拟,并给出相应的施工工艺及建议措施;结合现场检测数据,分析了该隧道病害产生的原因,提出碳纤维筋补强加固修复技术。分析发现:隧道仅拱顶存在不同深度裂缝(方案1)或拱顶及边墙均存在不同深度裂缝(方案2)时,使用碳纤维筋加固前,随着裂缝深度的增加,衬砌变形量明显增大,方案1最大位移位于仰拱中心,为5. 81 mm,最大应力位于拱脚处,为18. 80 MPa;使用碳纤维筋加固后衬砌变形减小较大,拱顶最为明显,方案1最大位移由5. 81 mm减小至3. 36 mm,减小了42. 2%,方案2最大位移由6. 17 mm减小至3. 64 mm,减小了41. 0%。结果表明碳纤维筋加固工艺对南瓦隧道具有良好的加固效果。
To better analyze the effect of carbon fiber reinforcement for Nanwa tunnel as a case study,the reinforcement plans with different disease positions of tunnel lining and crack depths are simulated in ANSYS,and corresponding construction techniques and countermeasures are put forward.Analysis finds that only in plan 1(when cracks of different depths exist on tunnel vault)and plan 2(when cracks of different depths exist on both tunnel vault and sidewall),the deformation of lining increases obviously with the increase of crack depth before carbon fiber reinforcement,with the maximum displacement 5.81 mm in plan 1 at the center of the inverted arch and the maximum stress 18.80 MPa located in the foot of the arch.After carbon fiber reinforcement,the deformation of lining is greatly reduced,with the maximum displacement in plan 1 cut from 5.81 mm to 3.36 mm,declining by 42.2%,and the maximum displacement in plan 2 decreasing from 6.17 mm to 3.64 mm,dwindling by 41.0%.Result demonstrates that the carbon fiber reinforcement technology has good reinforcement effect on Nanwa tunnel.
作者
霍润科
李曙光
杜丽辉
杨俊卿
韩飞
HUO Run-ke;LI Shu-guang;DU Li-hui;YANG Jun-qing;HAN Fei(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Beijing Tongyun Technology Co.,Ltd.,Beijing 100088,China)
出处
《长江科学院院报》
CSCD
北大核心
2018年第11期69-75,共7页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学基金项目(41172237)
关键词
碳纤维筋
隧道衬砌
补强加固
施工工艺
数值分析
深度裂缝
位移
carbon fiber reinforcement
tunnel lining
reinforcement
construction technique
numerical analysis
deep crack
displacement
