Average errors depending on calculation method.

The cement-mixed gravel, which is used in the construction of railway embankment, is a relatively more expensive material compared to sandy soil. Having said that, it is used where small residual settlement is required for example, abutment transition zone, due to characteristic of higher strength than sandy soil. In this paper, the time-dependent settlement were evaluated using field data measured over a long period of time at two RSR (Reinforced Subgrade for Railways) construction sites using two different backfill materials (sandy soil and cement-mixed gravel). The embankment settlement with cement-mixed gravel as a backfill material was reduced by 78% compared to that with sandy soil. Further, the period for stabilizing the embankment before installation of the railway track was significantly reduced with cement-mixed gravel as a backfill material.

用于铁路路堤修筑的水泥混合碎石（cement-mixed gravel），相较砂土成本相对更高。尽管如此，由于其强度高于砂土，该材料常被应用于对残余沉降量要求严苛的场景，例如桥台过渡段。本文依托两处采用两种不同回填材料（砂土与水泥混合碎石）的铁路加固路基（Reinforced Subgrade for Railways，RSR）施工场地的长期现场实测数据，对随时间变化的沉降量展开了评估。结果表明，采用水泥混合碎石作为回填材料时，路堤沉降量较砂土回填工况降低了78%。此外，采用水泥混合碎石回填可显著缩短铁路轨道铺设前的路堤稳定养护周期。