研究目的：运用不同配比的石灰、水泥和固化剂、粉煤灰对第四系上更新统黏土进行改良，获取所得到的颗粒级配的变化，塑限、液限、塑性指数的变化，胀缩特性的变化，击实试验参数的变化以及强度和水稳性的变化，得到经改良处理后，能够达到作为客运专线填料的要求。
研究结论：(1)下蜀黏土是一种工程性质比较特殊的填料，其含水量对土体强度、动模量有非常显著的影响;(2)在下蜀黏土中掺入一定比例的生石灰、熟石灰、普通硅酸盐水泥、土壤固化剂可达到提高土的强度和水稳性，降低土的压缩性和胀缩性，但单纯掺合粉煤灰不能达到这些目的;(3)下蜀黏土填料改良研究对南方地区客运专线填料选择具有较高参考价值。
Research purposes:The introduction is given to the engineering characteristics of the clay of the upper pleistocene series of the Quaternary System and the improvement of the clay is made by using the different matching ratios of the lime，the cement，the firming agent and the flyash to obtain the change of the grain compositions，the changes of the plastic limit，the liquid limit and the plastic index，the changes of the contractibility and the dilatability characteristics，the change of the parameters of compaction test and the changes of the strength and water stability for making the improved clay meeting the requirement of the filling material for high － speed railway．
Research conclusions: (1)The Xiashu clay is a filling material with relatively special engineering characteristics and its water content has the obvious effects on the soil strength and dynamic modulus．(2) By mixing with the quicklime，the hydrated lime，the ordinary Portland cement and the soil firming agent by certain ratios，the soil strength and water stability can be enhanced and the compressibility，the contractibility and the dilatability of the soil can be reduced，but the targets mentioned above can not be achieved only by mixing with flyash． (3) The research on improvement of the Xiashu clay can provide the reference to choice of the filling material for high － speed railway in the south area of China．
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