Railway subgrade thermal-hydro-mechanical behavior and track irregularity under the sunny-shady slopes effect in seasonal frozen regions

作     者：REN Juan-juan ZHANG Kai-yao ZHENG Jian-long WEI Hui ZHANG Yi-chi DU Wei YE Wen-long 任娟娟;章恺尧;郑健龙;韦慧;张亦弛;杜威;叶文龙

作者机构：School of Traffic&Transportation EngineeringChangsha University of Science&TechnologyChangsha 410114China School of Civil EngineeringSouthwest Jiaotong UniversityChengdu 610031China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2022年第29卷第11期

页      面：3793-3810页

核心收录：

学科分类：0810[工学-信息与通信工程] 0806[工学-冶金工程] 081401[工学-岩土工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0814[工学-土木工程] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：Projects(2021YFF0502100,2021YFB2600900)supported by the National Key R&D Program of China Projects(52022085,52278461)supported by the National Natural Science Foundation of China Project(22CXTD0051)supported by Sichuan Youth Science and Technology Innovation Team,China 

主　　题：frost heaving thermal-hydro-mechanical coupling sunny-shady slopes effect track irregularity 

摘      要：The sunny-shady slopes effect is a phenomenon that impacts the temperature distribution of high-speed railway subgrades,resulting in uneven frost heaving deformation on the subgrade surface,which in turn causes static irregularity in the slab *** on the hydraulics theory,a thermal-hydro-mechanical(THM)coupled model of frozen soil is established and *** explore the process and characteristics of the temperature field and deformation of soil during the freezing process of high-speed railway subgrades and analyze the track irregularity variation law of China Railway Track SystemⅢslab tracks under uneven frost heaving *** results show that,because the left and right slopes of high-speed railway subgrade are exposed to different amounts of solar radiation,which is the key factor causing uneven frost heaving of *** strike angles cause changes in temperature of the subgrade’s upper part and the frost heaving amount on the surface,leading to differences in the deformation of the slab track structure:Increased strike angle weakens the rail level irregularity of the down line and marginally increases the rail level irregularity of the up line,and these become consistent in north-south ***,when selecting railway lines in seasonal frozen areas,the west-east direction should be avoided to prevent the extremes in sunny-shady slopes effect on subgrades.