Study on static characteristics of a novel prestress-reinforced railway subgrade  

作　　者：Junli Dong Fang Xu Qishu Zhang Wuming Leng Yafeng Li Qi Yang 

机构地区：[1]School of Civil Engineering,Central South University,Changsha 410075,China [2]MOE Key Laboratory of Engineering Structures of Heavy Haul Railway,Central South University,Changsha 410075,China [3]School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China [4]School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China

出　　处：《Railway Engineering Science》2025年第1期108-126,共19页铁道工程科学(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51978672 and 52308335);the Natural Science Funding of Hunan Province(Grant No.2023JJ41054);the Natural Science Research Project of Anhui Educational Committee(Grant No.2023AH051170)。

摘　　要：Understanding the reinforcement effect of the newly developed prestressed reinforcement components(PRCs)(a system composed of prestressed steel bars(PSBs),protective sleeves,lateral pressure plates(LPPs),and anchoring elements)is technically significant for the rational design of prestressed subgrade.A three-dimensional finite element model was established and verified based on a novel static model test and utilized to systematically analyze the influence of prestress levels and reinforcement modes on the reinforcement effect of the subgrade.The results show that the PRCs provide additional confining pressure to the subgrade through the diffusion effect of the prestress,which can therefore effectively improve the service performance of the subgrade.Compared to the unreinforced conventional subgrades,the settlements of prestressreinforced subgrades are reduced.The settlement attenuation rate(Rs)near the LPPs is larger than that at the subgrade center,and increasing the prestress positively contributes to the stability of the subgrade structure.In the multi-row reinforcement mode,the reinforcement effect of PRCs can extend from the reinforced area to the unreinforced area.In addition,as the horizontal distance from the LPPs increases,the additional confining pressure converted by the PSBs and LPPs gradually diminishes when spreading to the core load bearing area of the subgrade,resulting in a decrease in the Rs.Under the singlerow reinforcement mode,PRCs can be strategically arranged according to the local areas where subgrade defects readily occurred or observed,to obtain the desired reinforcement effect.Moreover,excessive prestress should not be applied near the subgrade shoulder line to avoid the shear failure of the subgrade shoulder.PRCs can be flexibly used for preventing and treating various subgrade defects of newly constructed or existing railway lines,achieving targeted and classified prevention,and effectively improving the bearing performance and deformation resistance of the subgrade.The research resul

关 键 词：Prestressed subgrade Static characteristic Reinforcement effect Reinforcement mode SETTLEMENT Numerical simulation 

分 类 号：U213.1[交通运输工程—道路与铁道工程]