摘要
根据高寒地区某隧道衬砌裂缝的调查结果,基于断裂力学理论采用有限元模拟计算隧道二衬混凝土裂缝应力强度因子,根据裂缝尖端的稳定系数判定隧道衬砌结构裂缝的安全性。在此基础上,提出增设套拱、拆换二衬、粘贴钢带法等三种结构加固方案,同时考虑防排水、保温等措施,并从方案有效性、工期、造价等多方面进行综合比选。通过依托工程实例表明:采用裂缝尖端稳定系数可实现隧道衬砌结构裂缝的安全性定量化判定,为处治方案提供决策参考;计算得出衬砌裂缝深度越大,其尖端稳定系数越小,衬砌结构安全性越差。根据隧道病害成因分析及多因素比选,推荐采用增设套拱方案。
According to the investigation results of a tunnel lining crack in alpine region,based on fracture mechanics theory,the stress intensity factor of tunnel lining concrete crack was calculated by finite element simulation,and the safety of cracked tunnel lining structure was determined according to the stability coefficient of crack tip.Then the three kinds of structural reinforcement schemes were proposed,such as adding arch sleeve,removing and replacing the second lining,and pasting steel strip method.Meanwhile,waterproof and drainage measures and thermal insulation measures were considered,and comprehensive comparison and selection was made from the effectiveness,construction period and cost of the schemes.Based on the engineering examples,it is shown that the safety of lining structure of cracked tunnel can be determined quantitatively by using the stability coefficient of crack tip,which can provide decision-making reference for treatment scheme;the calculation shows that the greater the crack depth is,the smaller the stability coefficient at the tip is,and the worse the safety of lining structure is.According to the cause analysis of tunnel diseases and multi factor comparison,it is recommended to adopt the scheme of adding arch sleeve.
作者
余顺
王道良
夏诗画
Yu Shun;Wang Daoliang;Xia Shihua(China Merchants Chongqing Communications Research&Design Institute Co.,Ltd.,Chongqing 400067,P.R.China;National Engineering Laboratory of Tunnel Construction Technology,Chongqing 400067,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2020年第S01期420-425,436,共7页
Chinese Journal of Underground Space and Engineering
基金
国家重点研发计划(2017YFC0806003)
重庆市社会事业与民生保障科技创新专项项目(cstc2017shmsA30010)
关键词
高寒隧道
衬砌裂缝
安全评价
病害处治
alpine tunnel
lining cracks
safety evaluation
disease treatment
