Viable remediation of the large lateral deformation of high-speed railway (HSR) subgrades, especially in soft soil areas, is still absent. An integrated rectification scheme of high-pressure jet-grouting (HPJG) combined with stress-release techniques was conducted to rectify the large lateral deformation of an operational HSR subgrade in the soft soil area of China, but without any refined design and mechanical analysis before rectification due to the emergency. The objective of the study is to post-evaluate the rectification effects utilising field monitoring data and numerical calculations. The monitoring data showed that the maximum lateral deviation of the subgrade was 69.1 mm, which almost met the expected correction requirements. However, the influence of the excess pore water pressure (EPWP) dissipation on the correction deviation was not considered in the scheme. Therefore, a numerical model was established to further investigate this effect and corresponding mitigation methods. The calculated results revealed that EPWP in the foundation dissipated mostly within 6 months after rectification, and the deformation loss accounted for 30.7% of the total deviation. Prolonging the interval of two-row pile construction can be a plausible approach to mitigate the deviation loss. The findings provide a feasible method for correcting large lateral deformation of HSR subgrades.

中文翻译：

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旋喷对高速铁路路基横向变形的修正效果

对于高速铁路（高铁）路基的大横向变形，特别是在软土地区，仍然缺乏可行的修复方法。针对我国软土地区运营高铁路基的大横向变形，采用高压喷射注浆（HPJG）结合应力释放技术的综合整治方案，但之前没有进行任何精细设计和力学分析。因紧急情况进行整改。研究的目的是利用现场监测数据和数值计算对整改效果进行后评估。监测数据显示，路基最大横向偏差为69.1毫米，基本满足预期修正要求。但方案中没有考虑超孔隙水压力(EPWP)消散对修正偏差的影响。因此，建立了数值模型来进一步研究这种影响和相应的缓解方法。计算结果表明，地基中的EPWP在整改后6个月内大部分消散，变形损失占总偏差的30.7%。延长两排桩施工间隔可能是减轻偏差损失的一种可行方法。研究结果为修正高铁路基大横向变形提供了可行的方法。