岩土工程学报2025，Vol.47Issue(12)：2517-2527,11.DOI:10.11779/CJGE20240664
高内压作用下混凝土衬砌渗流-应力-开裂分析
Seepage-stress-cracking analysis of concrete lining under high internal pressure
摘要
Abstract
Internal water leakage induced by concrete lining cracking under high internal pressure is a frequent challenge in the operation of pressure tunnels.This paper develops a novel seepage-stress-cracking analysis method of concrete lining under high internal pressure.The cohesive element is adopted to model the discontinuous propagation of cracks within the lining.Additionally,the built-in contact simulation in the software ABAQUS is improved to represent the interface between the lining and surrounding rock.Furthermore,the model is validated by comparison with physical model experiment and engineering monitoring data.Finally,compared with the results of the traditional continuum method,a systematic analysis of the characteristics of the continuum/discontinuous analysis methods is carried out.The results indicate that under high internal pressure,cracking in the concrete lining is inevitable,and the cracks is distributed in a sparse and infrequent pattern.Once stable seepage channels form at the cracks,the pressure difference between the inner and outer walls of the lining decreases rapidly,with the surrounding rock becoming the main body bearing of the hydraulic load.The steel reinforcement stress exhibits a progression of slowly increasing,rapidly rising,sharply descending,and then maintaining a low value throughout the loading process.The overall trends from the continuous analysis model and the discontinuous analysis method are consistent;however,when precise description of the crack propagation process is required,the seepage-stress-cracking discontinuous analysis method must be used,as the continuous medium analysis method cannot simulate the above characteristics.关键词
高压隧洞/混凝土衬砌/黏聚单元/裂缝拓展/内水外渗Key words
high pressure tunnel/concrete lining/cohesive element/crack expansion/leakage分类
建筑与水利引用本文复制引用
金俊超,景来红,宋志宇,苏凯,杨风威,刘光昆..高内压作用下混凝土衬砌渗流-应力-开裂分析[J].岩土工程学报,2025,47(12):2517-2527,11.基金项目
中国博士后科学基金项目(2022M721299) （2022M721299）
河南省科技攻关(232102320339) （232102320339）
中国水力发电工程学会青托项目(CSHE-YESS-2024018)This work was supported by China Postdoctoral Science Foundation(Grant No.2022M721299),Henan Province Natural Science Foundation(Grant No.232102320339)and Young Elite Support Scheme of China Society for Hydropower Engineering(Grant No.CSHE-YESS-2024018). （CSHE-YESS-2024018）
