长期运行引水隧洞开裂衬砌受力影响规律与承载特性  

Study on the Stress Influence Law and Bearing Characteristics of Cracked Lining Structure of a Long-term Service Diversion Tunnel

作　　者：李翔宇 王晓兴 王祝国 赵斌 王海军[2] LI Xiang-yu;WANG Xiao-xing;WANG Zhu-guo;ZHAO Bin;WANG Hai-jun(Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,China University of Mining and Technology,Xuzhou 221116,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China;Dongjiang Water Source Project Management Division of Shenzhen,Shenzhen 518036,China)

机构地区：[1]中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221116 [2]南京水利科学研究院,江苏南京210029 [3]深圳市东江水源工程管理处,广东深圳518036

出　　处：《水电能源科学》2024年第1期106-110,133,共6页Water Resources and Power

基　　金：国家自然科学基金重点项目(51739008)。

摘　　要：衬砌裂缝是引水隧洞中常见的病害之一,衬砌开裂会对隧洞衬砌承载力和安全性造成不同程度的影响。以长期服役的东江水源工程引水隧洞衬砌为研究对象,通过现场检测确定了全洞段裂缝的产状、分布规律和开裂特征。利用ANSYS软件中的软弱薄层单元,建立了开裂衬砌的三维数值模型,得出贯穿型纵向裂缝的位置变化对衬砌结构安全性的影响,系统分析了衬砌的承载特性。结果表明,衬砌开裂条件下,衬砌结构局部开裂区的安全系数降低最为显著,尤其是拱肩位置的裂缝对结构的危害程度远大于边墙、拱顶裂缝;另外,裂缝的产生会对其他未开裂部位的受力特性及稳定性产生影响。数值模拟结果良好地体现了裂损衬砌对隧洞结构的影响规律,与现场检测结果一致,为长期服役下隧洞结构病害防治提供了参考。Lining crack is a common disease in diversion tunnel,which will affect the bearing capacity and safety of tunnel lining.This paper focused on the long-term service of the lining in the diversion tunnel of the Dongjiang Water Source Project as the research subject.Through on-site inspections,the geological conditions,distribution patterns,and characteristics of cracking in the entire tunnel section's fractures have been determined.The 3D numerical model of cracked lining is established by using the soft thin layer element in software ANSYS.The influence of the location change of the longitudinal cracks on the safety of the lining structure and the bearing characteristics of the cracked lining are systematically analyzed.The results show that under the condition of lining cracking,the safety factor of local cracking area of lining structure decreases significantly.In particular,the cracks in the spandrel are far more harmful to the structure than the cracks in the side wall and arch-crown.In addition,the generation of cracks will affect the mechanical characteristics and stability of other uncracked parts.The numerical simulation results reflect the influence law of cracked lining on tunnel structure,which is consistent with the field inspection results.This paper provides a reference for the prevention and treatment of tunnel structural diseases under long-term service.

关 键 词：长期服役 贯穿型纵向裂缝 裂损衬砌 现场检测 软弱薄层单元 承载特性 

分 类 号：TV554[水利工程—水利水电工程]