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饱和粉土地基在动荷载作用下的液化问题是高速铁路抗震设计中重要的研究内容。为了能够定量地分析京沪高速铁路饱和粉土地基在加固前后的抗液化强度和地震时的变形特性,在室内对加固前后两种不同密度的饱和粉土进行了3组围压条件下一系列振动三轴液化试验。试验研究获得了两种不同密度饱和粉土的抗液化强度曲线、动强度及超静孔隙水压力的增长规律,为进一步分析饱和粉土地基在加固前后的液化变形特性提供了科学数据。
The liquefaction problem of saturated silt foundation under dynamic loads is an important research content in the seismic design of high-speed railway. In order to quantitatively analyze the liquefaction resistance of the saturated silt foundation before and after reinforcement of Beijing-Shanghai high-speed railway and the deformation characteristics during the earthquake, two series of saturated silt with different densities before and after reinforcement were subjected to three sets of confining pressure conditions Vibration triaxial liquefaction test. The experimental research has obtained the law of liquefaction resistance, dynamic strength and excess pore water pressure of two kinds of saturated silt with different density, which provide scientific data for further analyzing the liquefaction deformation characteristics of saturated silty soil before and after consolidation.