Soft soil ground is encountered occasionally during construction of expressway, not only settlement should be calculated but also the stability should be considered when the embankment is founded on large tilt angle soft soil. Necessary anti-slide method should be taken to avoid lateral slip. Considering the character of large tilt angle of ground surface of the section of k34 +910 - k35 +000 which belongs to the 6th contractor of Tongping expressway, the stability analysis model of embankment of the section was set up after the accurate mechanical properties was obtained by boring and test. Analysis results show that the safety factor is only 0. 586 if the soft soil reminds untreated, while the safety factor would increased to 1.047 as treat it using stone columns, both schemes could not meet the demands of the rule of the Standard. Furthermore analysis show that when treating the soft soil with a row of reinforced concrete pile and stone columns, the safety factor would be 1.222, the number would increase to 1. 323 if one more row of reinforced concrete pile was added. Both schemes ceuld meet the requirements of the embankment stability.%高速公路建设过程中会遇到较多的软土地基,当软土地基基底倾斜角度较大时,特别是路堤高度较大的情况下,在对其进行沉降计算的同时,还需重点对其稳定性进行验算,并采取必要的抗滑措施,避免产生侧向滑移.结合通平高速第6合同段k34 +910～k35+ 000的高路堤软土地基基地倾斜角度大的特点,通过开展现场钻探与土工试验,在获取准确的软土力学性质参数的基础上,建立了该路段软土路基稳定性计算模型.计算表明,未处治路堤滑动安全系数为0.586,仅采用碎石桩处治,其路堤滑动安全系数为1.047,都无法满足规范要求.采用一排钢筋砼桩+碎石桩处治后滑动安全系数为1.222,两排钢筋砼桩+碎石桩处治后滑动安全系数为1.323,处治方案技术上是可行,均可满足路堤稳定性要求.
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