Review of research on high-speed railway subgrade settlement in soft soil area

• Published in: Railway Engineering Science (Online) Vol. 28; no. 2; pp. 129 - 145
• Main Authors: Zhou, Shunhua, Wang, Binglong, Shan, Yao
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01-06-2020; Springer Nature B.V; SpringerOpen
• Subjects: Algorithms; Automotive Engineering; Control methods; Differential settlement; Engineering; Foundations; Geoengineering; High speed rail; High-speed railway; Hydraulics; Locomotives; Pile-supported embankment; Railroads; Railway construction; Railway engineering; Railway tracks; Regional/Spatial Science; Settlement prediction; Soft soil foundation; Soil arching; Soil compressibility; Soil permeability; Soil settlement; Soils; Subgrade; China; Soft soil foundation; Subgrade; Pile-supported embankment; High-speed railway; Settlement prediction; Soil arching
• ISSN: 2662-4745; 2662-4753
• DOI: 10.1007/s40534-020-00214-x

Construction issues of high-speed rail infrastructures have been increasingly concerned worldwide, of which the subgrade settlement in soft soil area becomes a particularly critical problem. Due to the high compressibility and low permeability of soft soil, the post-construction settlement of the subgrade is extremely difficult to control in these regions, which seriously threatens the operation safety of high-speed trains. In this work, the significant issues of high-speed railway subgrades in soft soil regions are discussed. The theoretical and experimental studies on foundation treatment methods for ballasted and ballastless tracks are reviewed. The settlement evolution and the settlement control effect of different treatment methods are highlighted. Control technologies of subgrade differential settlement are subsequently briefly presented. Settlement calculation algorithms of foundations reinforced by different treatment methods are discussed in detail. The defects of existing prediction methods and the challenges faced in their practical applications are analyzed. Furthermore, the guidance on future improvement in control theories and technologies of subgrade settlement for high-speed railway lines and the corresponding challenges are provided.