中文摘要：

为研究弱强风化泥质粉砂岩用作高速铁路路堤填料的适宜性,对泥质粉砂岩进行室内试验,对软岩改良土填料的动力稳定性、强度、压缩特性等指标进行研究,对经过改良的软岩土路基的刚度、水稳定性、变形等指标进行现场测试,并建立连续型直接数据GM（1,1）模型对路基的工后沉降进行预测。研究结果表明：泥质粉砂岩不宜直接用作路基填料,必须进行改良处理;软岩改良土路基的动力稳定性、强度、刚度、变形等能够满足高速铁路路堤填料要求,但不宜用于浸水路堤;连续型直接数据GM（1,1）模型可以要求自变量不一定为等时空距,经与等时空距GM（1,1）模型、泊松曲线模型相比,该模型的预测精度较高。

英文摘要：

To study the suitability of the weak to highly argillaceous siltstone as filling for embankment of high speed railway, the argillaceous siltstone was researched through the indoor experiments, the filling dynamic stability, strength and compression characteristics of argillaceous siltstone physical improved soil were studied, and then indexes such as improved soil subgrade stiffness, water stability and deformation were inspected in situ test. To predict the settlement after acceptance of subgrade, a continuous direct data GM（1,1） model was established. The results show that the argillaceous siltstone should be improved that it cannot be used directly as filling for subgrade of high speed railway. The dynamic stability, strength, stiffness and deformation of subgrade filled with improved soft rock can meet the requirements of high speed railway, but improved soil should not be used for soaking embankment. The continuous direct data GM（1,1） model may require the independent variable is not necessarily equal interval, and this model has very high prediction accuracy compared with the equal interval GM（1,1） model and Poisson curve mode.