【摘要】 通过对山西地区代表性的粉土进行室内的共振柱试验及动三轴试验,研究了本地区粉土的动力特性和粉土在振动过程中孔隙水的变化规律,重点把粉土的共振柱试验结果与Seed和Idriss建议的砂土及饱和粘土的剪切模量比与剪应变(G/G0-γ)曲线和阻尼比与剪应变(D-γ)曲线的变化范围进行了对比分析。研究结果表明:粉土的剪模量比要比饱和砂土的大,其阻尼比小于砂土的阻尼比;粉土的抗液化强度与液化振次之间的关系可用乘幂函数来表示,其振动孔隙水压力的变化规律可以用二次抛物线拟合;结合了本地区的工程实践经验,可为工程设计与施工提供参考。更多还原

【Abstract】 Through analyzing the testing results from the tests with free vibration column and with dynamic triaxial apparatus for the silts in Shanxi,the dynamic properties of the soils and the variation of pore water during the vibration are studied by the comparison with the variation range of G/G₀-γ and D-γ curves of sand and saturated clay recommended by Seed and Idriss.Testing results show that dynamic shear modulus ratio of silt is higher than that of general saturated sand,but its damping ratio is lower.The relationship between the liquefaction resistance of silt and the cyclic number may be expressed with power function,and its developing regulation of dynamic pore water pressure could be fitted with quadratic parabola function.Based on the local project experience,the results would provide the reference for the design and construction of similar projects.更多还原