中文摘要：

废弃轮胎破碎后与土混合可改善土的工程特性,为提高废旧轮胎的循环利用和解决膨胀土工程问题提供了新途径。取湖北荆州膨胀土,掺入废弃轮胎橡胶颗粒形成改性膨胀土,完成了素膨胀土和改性膨胀土的物理特性、胀缩特性、强度特性试验。结果表明,当轮胎橡胶颗粒的掺量（质量百分数）小于23%时,改性膨胀土的液限和塑性指数随掺量的增加而增大,但塑限基本不变;最大干密度较素膨胀土降低,最优含水率基本不变化;改性膨胀土的粘聚力和抗剪强度较素膨胀土明显下降;粘聚力总体上随掺量的增加而减小,但抗剪强度和内摩擦角随掺量的增加变化不大;改性膨胀土的胀、缩性明显减弱,当橡胶颗粒的掺量为23%时,对胀缩特性的改善效果最佳。

英文摘要：

The physical properties,swelling-shrinkage characteristics and shear strength of an expansive soil modified with waste tire rubber particles were studied.The expansive soil used was obtained from Jingzhou,Hubei Province,China.The test results showed that when the mass fractions of rubber particles was under 23%,the liquid limit and plastic index of the modified expansive soil increased with the increment of mass fractions of rubber particles,while the plastic limit had little change.Compared with the unmodified expansive soil,the maximum dry density of the modified expansive soil decreased and the optimum water content was almost unchanged,the cohesion and the shear strength of the modified expansive soil decreased clearly,but the shear strength and the internal friction angle of the modified expansive soil had little change with the increment of mass fractions of rubber particle.The swelling-shrinkage characteristics of the modified soil were significantly weakened.Moreover,the best modified effect was obtained under a mass fraction of waste tire rubber particles of 23%.