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开展对水泥土搅拌桩软土地基土体试样的GDS(Global Distribution System)共振柱试验,研究不同剪应变、围压、水泥土置换率对土体动力特性的影响。结果表明,水泥土搅拌桩软土地基土体的动剪切模量G和阻尼比D随剪应变γ变化趋势与软黏土一致,在小应变范围内围压和置换率对土体的动剪切模量G和阻尼比D的影响显著,随着剪应变γ增大,围压和置换率的影响减弱;水泥土搅拌桩软土地基土体的最大动剪切模量G_(max)与围压表现出良好的线性关系,围压越大,提高水泥土的置换率对土体最大动剪切模量G_(max)增强效果越明显。研究结果可为地区水泥土搅拌桩软土地基土体动力参数的取值提供一定的参考。
The GDS (Global Distribution System) resonance column test on soil samples of cement-soil mixed pile soft soil foundation was carried out to study the influence of different shear strain, confining pressure and cement soil replacement ratio on the dynamic characteristics of soil. The results show that the dynamic shear modulus (G) and damping ratio (D) of soft soil foundation with cement-soil mixing pile are consistent with that of soft clay in the trend of shear strain γ. The influence of confining modulus G and damping ratio D is significant. With the increase of shear strain γ, the influence of confining pressure and displacement ratio is weakened. The maximum dynamic shear modulus of soil in soft soil foundation with cement-soil mixing pile, G max, The confining pressure shows a good linear relationship. The bigger the confining pressure is, the more obvious the effect of increasing the maximal dynamic shear modulus G max of soil cement is. The results can provide reference for the value of dynamic parameters of soft soil foundation in regional cement-soil mixing pile.