淮安市典型土动力特性的试验研究

Experimental study on dynamic property of typical soils for Huaian City

通过对淮安市典型的全新世沉积粉土和粘性土进行室内自振柱试验及粉土的动三轴液化试验,把粉土和粘性土的自振柱试验结果与Seed和Idriss建议的砂土及饱和粘土的剪切模量比G/Gmax～γ曲线和阻尼比λ～γ曲线的变化范围进行对比,结果表明:粉土的剪模量比要比饱和粘土的大,而比砂土的剪模量比要小,其阻尼比接近于砂土的阻尼比;粘性土的剪模量比要比一般饱和粘土的大,而与砂土的剪模量比相近,其阻尼比要比砂土的略低;粉土的抗液化强度与液化振次之间的关系可以用指数函数来表示,其振动孔隙水压力的发展规律可以用反正弦三角函数拟合;粘粒含量是影响淮安市全新世沉积粉土抗液化强度的主要影响因素。

In the paper, through analyzing the test results of free vibration column and dynamic triaxial apparatus on holocene deposited soils including silt and clayey soil in Huaian City, and by comparison with the variation range of G/G_(max)～γ and λ～γ curves of sand and saturated clay recommended by Seed and Idriss(1970), testing results show that dynamic shear modulus ratio G/G_(max) of silt is higher than that of general saturated clay, but lower than that of general sand. However, its damping ratio is close to that of general sand. On the other hand, for the clayey soil, its dynamic shear modulus ratio G/G_(max) is higher than that of general saturated clay, but close to that of general sand. The damping ratio of clayey soil is lower than that of general sand. The relationship between liquefaction resistance of silt and cyclic number may be expressed with exponential function, and its developing regulation of dynamic pore water pressure can be fitted with arcsine function. In addition, for liquefaction resistance of silt (Q_(4)), clay content is the major influencing factor.