Characteristics of the crack tip field in high-speed railway tunnel linings under train-induced aerodynamic shockwaves

作     者：Yi-Kang Liu Yu-Ling Wang E Deng Yi-Qing Ni Wei-Chao Yang Wai-Kei Ao 

作者机构：School of Civil EngineeringCentral South UniversityChangsha 410075China National Rail Transit Electrification and Automation Engineering Technology Research Center(Hong Kong Branch)The Hong Kong Polytechnic UniversityHong Kong 999077China Department of Civil and Environmental EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China The Hong Kong Polytechnic University Shenzhen Research InstituteShenzhen 518057China National Engineering Research Center of High-speed Railway Construction TechnologyChangsha 410075China 

出 版 物：《Underground Space》 (地下空间（英文）)

年 卷 期：2024年第18卷第5期

页      面：199-217页

核心收录：

学科分类：08[工学] 080102[工学-固体力学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：funded by the National Natural Science Foundation of China(Grant Nos.51978670 and 52308419) the Science and Technology Research and Development Program of China railway group limited(Grant Nos.2021-Major-01 and 2022-Key-22) the Fundamental Research Funds for the Central Universities of Central South University(Grant No.2023ZZTS0369) the Guangdong Basic and Applied Basic Research Foundation Project(Grant No.2021B1515130006) the Innovation and Technology Commission of Hong Kong,China(Grant No.K-BBY1) the Hong Kong Polytechnic University’s Postdoc Matching Fund Scheme(Grant No.1-W21Q) 

主　　题：Falling concrete blocks Tunnel lining cracks Aerodynamic shockwave Intensification effect Crack tip field Stress intensity factor 

摘      要：High-speed railway tunnels in various countries have continuously reported accidents of vault falling concrete *** the concrete block falling occurs,serious consequences follow,and traffic safety may be *** aerodynamic shockwave evolves from the initial compression wave may be an important inducement causing the tunnel lining cracks to grow and form falling concrete blocks.A joint calculation framework is established based on ANSYS Fluent,ABAQUS,and FRANC3D for calculating the crack tip field under the aerodynamic *** intensification effect of aerodynamic shockwaves in the crack is revealed,and the evolution characteristics of the crack tip field and the influence factors of stress intensity factor(SIF)are *** show that(1)the aerodynamic shockwave intensifies after entering the crack,resulting in more significant pressure in the crack than the input *** maximum pressure of the inclined and longitudinal cracks is higher than the corresponding values of the circumferential crack,respectively.(2)The maximum SIF of the circumferential,inclined,and longitudinal crack appears at 0.5,0.68,and 0.78 times the crack front *** maximum SIF of the circumferential crack is higher than that of the inclined and longitudinal *** possibility of crack growth of the circumferential crack is the highest under aerodynamic shockwaves.(3)The influence of train speed on the SIF of the circumferential crack is more than 40%.When the train speed,crack depth,and crack length change,the change of pressure in the crack is the direct cause of the change of SIF.