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.

中文翻译：

---

软土地基高速铁路路基沉降研究综述

在世界范围内，高铁基础设施的建设问题越来越受到关注，其中软土地区的路基沉降成为一个特别关键的问题。由于软土的高压缩性和低渗透性，这些地区的路基施工后沉降极为困难，严重威胁了高速列车的运行安全。在这项工作中，讨论了软土地区的高速铁路路基的重要问题。综述了有ball无less轨道的基础处理方法的理论和实验研究。重点介绍了不同处理方法的沉降演化和沉降控制效果。随后简要介绍了路基差异沉降的控制技术。详细讨论了采用不同处理方法加固的地基沉降计算算法。分析了现有预测方法的缺陷以及在实际应用中面临的挑战。此外，还提供了有关未来改进高速铁路路基沉降控制理论和技术的指南以及相应的挑战。