主要从颗粒级配及CBR值两个物理力学指标出发,对弱～强风化泥质粉砂岩提出掺加20%中粗砂的物理改良措施,从而为高速铁路客运专线路堤本体提供填料。通过循环击实与泡水试验,重点研究泥质粉砂岩物理改良土的颗粒粒径变化情况,得知这种物理改良土不适宜用于浸水路堤部分。另外,从现场实体填筑工程来看,泥质粉砂岩物理改良土的压实质量好、沉降量小、无污染,具有良好的推广应用价值。 Based on two physical and mechanical indexes, such as particle size distribution and CBR value, physical improvement measures of adding 20% ​​coarse sand were proposed for weak ~ strong weathered siltstone so as to provide filler for embankment body of high-speed railway passenger dedicated line. By means of cyclic compaction and soaking water experiments, the change of particle size of the physically modified soil with muddy siltstone was studied emphatically, and it was found that this kind of physical modified soil is not suitable for the part of embankment. In addition, according to the on-site physical filling project, the quality of compacted silt silt physical improvement soil is good, the settlement is small, no pollution, and has good popularization and application value.