A railway project is planned to adopt improved expansive soil with cement for subgrade filling. Through analyzing the experiments of the angle of internal friction, the free expansion rate, bearing ratio CBR and unconfined compression strength, study the change trend of physical and mechanical indexes of cement improved soil in different admixture amount, evaluate whether improved scheme is feasible, and determine the best cement admixture amount of the feasible scheme, so as to guide the construction in site.%某铁路工程拟采用水泥对膨胀土进行改良后做为路基填料.通过对内摩擦角、自由膨胀率、承载比CBR、无侧限抗压强度等试验的分析,研究在不同掺合量情况下水泥改良土的物理力学指标变化规律,评估改良方案是否可行,并确定可行方案的水泥最佳掺合量,以指导现场施工.
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