为了研究橡胶混合黏土（混合土）的动变形特性，对不同橡胶掺量、橡胶粒径和围压的混合土开展共振柱试验，分析动剪切模量G 和阻尼比λ 的发展规律，并基于二元介质模型，提出了表达混合土接触状态的骨架孔隙比esk计算方法，进一步依托骨架孔隙比esk对混合土的最大动剪切模量Gmax进行评价。结果表明：掺入橡胶颗粒后，混合土的G减小，λ 增大，且橡胶掺量增大时，混合土的G减小、λ 增大；围压增大时，混合土的G增大、λ减小；橡胶粒径增大时，混合土的G增大、λ减小。随着橡胶掺量增大，骨架孔隙比esk增大，Gmax降低；在相同橡胶掺量时，随着橡胶粒径的增大，esk增大，Gmax升高。在Hardin公式的基础上，基于骨架孔隙比esk提出了考虑橡胶掺量和橡胶粒径的Gmax表征模型，该模型具有较好的准确性，可为评价橡胶混合黏土Gmax提供依据。 Inorder to study the dynamic deformation characteristics of rubber-clay mixtures

resonance column tests were conducted on mixtures with different rubber contents

rubber particle sizes

and confining pressures. The development patterns ofdynamic shear modulus G and damping ratio λ were analyzed. A calculation method forskeleton void ratio esk expressingthe contact state of mixtures was proposed based on the binary medium model. Furthermore

the maximum dynamic shear modulus Gmax of mixtures was evaluated based on skeleton void ratio esk. The results show thatadding rubber particles leads to a decrease in G and increase in λ. As the rubber content increases

G decreasesand λ increases. Additionally

G increases and λ decreases with increasing confiningpressure. Moreover

G increases and λ decreases with increasing rubber particlediameter. With an increase in rubber content

the skeleton void ratio esk increases and Gmax decreases. At thesame rubber dosage

as the rubber particle size increases

esk increases and Gmax rises. Based onHardin’s formula

a characterization model of Gmax considering rubber content and rubber particlesize is proposed using skeleton void ratio esk. The model exhibits good accuracy and can serve asa basis for evaluating Gmax ofrubber-clay mixtures.