摘要
隧道衬砌在长期服役过程中会产生多种病害,其中以围岩松动和衬砌裂缝最为常见,这两种病害对衬砌承载性能影响也最为显著。基于扩展有限元法,对混凝土衬砌开裂状态下裂缝的萌生、发展过程进行模拟,定量分析了混凝土开裂对衬砌承载性能的影响。首先验证了扩展有限元法模拟隧道衬砌裂缝演化过程的准确性,进而研究开裂衬砌在围岩松弛荷载作用下的承载性能退化,并定量给出了不同开裂状态下衬砌的极限承载力。结果表明:当裂缝深度为0.1 d时,衬砌临界开裂荷载相比完整衬砌减少了55%,极限承载力减少了60%;当裂缝深度达0.5 d时,衬砌临界开裂荷载折减高达80%,极限承载力折减达70%。
There are varieties of diseases exist in long-term service of tunnel lining,among which surrounding rock loosening and lining cracks are the most common ones,which have the most significant influence on the bearing capacity.Based on the extended finite element method,this study simulated the initiation and development process of cracks in the cracking state of concrete lining,and quantitatively analyzed the influence of concrete cracking on the bearing capacity of the lining.Firstly,the accuracy of the extended finite element method to simulate the crack evolution process of tunnel lining is verified,and then the load-bearing degradation of cracked lining under the relaxation load of surrounding rock is studied,and the ultimate bearing capacity of cracked lining under different cracking states is quantitatively given.The results show that when the crack depth is 0.1 d,the critical cracking load and ultimate bearing capacity of the ring lining are reduced by 55%and 60%,respectively,compared with that of the complete lining.When the crack depth reaches 0.5 d,the critical cracking load and ultimate bearing capacity of the ring lining are reduced up to 80%and 70%,respectively.It should be pointed out that the lining referred to in this paper is the ring lining with cracking,without considering the three-dimensional effect of the lining.
作者
张春海
李明雄
陈健
郭东
吴建波
Zhang Chunhai;Li Mingxiong;Chen Jian;Guo Dong;Wu Jianbo(Yanchong Expressway Management Center,Zhangjiakou,Hebei 075000,P.R.China;Shenzhen Key Laboratory of Intelligent Structure System for Civil Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen,Guangdong 518055,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2022年第S02期729-736,共8页
Chinese Journal of Underground Space and Engineering
基金
国家重点研发计划(2019YFC1511104)
河北省高速公路延崇筹建处项目(KT20)
关键词
扩展有限元
裂缝
围岩松弛荷载
临界开裂荷载
极限荷载
extended finite element
crack
surrounding rock loosening load
critical cracking load
ultimate load
作者简介
张春海(1971—),男,河北张家口人,主要从事隧道施工方面的工作。E-mail:2831116154@qq.com;通讯作者:郭东(1993—),男,山西原平人,博士生,主要从事隧道结构安全的研究。E-mail:13713510895@163.com
