Abstract Soil-rock mixture (S-RM) is a complex geo-material characterized by competent rock inclusions floating in a weaker soil matrix structure. The mechanical performances of it are significantly controlled by the interaction and properties of rock blocks and the external environment. In this study, experiments on S-RM were conducted through a large-scale triaxial apparatus for investigating the effects of rock block content and confining pressure on the dynamic characteristics of them. The features of the axial stress and strain time-histories of S-RM were analyzed. The reductions of the maximum shear modulus and the dynamic shear modulus ratio were investigated. The increase in the damping ratio was explored. And the effects of rock block content and confining pressure on the dynamic characteristics of S-RM were discussed in detail. Results indicate that there is an approximately linear relationship between the maximum shear modulus and the rock block content while an approximately exponential relationship between the maximum shear modulus and the confining pressure. The distribution of the dynamic shear modulus ratio of S-RM takes on a low dispersion at the same normalized shear strain. The unnormalized/normalized damping ratio of S-RM is increasing with the shear strain and takes on a feature of zonal distribution as a whole. Both the dynamic shear modulus ratio and the normalized damping ratio of S-RM could be evaluated by a function of normalized shear strain. The four-parameter formulas for the dynamic characteristics of S-RM were thus introduced for all practical purposes in the final. The results of this study can provide a reference to further understand the dynamics performance and the parameter determination of S-RM and other similar geo-materials.

中文翻译：

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岩块含量和围压对土石混合动力特性的影响

摘要 土石混合体（S-RM）是一种复杂的地质材料，其特征是有能力的岩石包裹体漂浮在较弱的土壤基质结构中。它的力学性能受岩块与外界环境的相互作用和性质的显着控制。在这项研究中，通过大型三轴仪对 S-RM 进行了实验，以研究岩块含量和围压对其动力特性的影响。分析了S-RM的轴向应力和应变时程特征。研究了最大剪切模量和动态剪切模量比的降低。研究了阻尼比的增加。并详细讨论了岩块含量和围压对S-RM动力特性的影响。结果表明，最大剪切模量与岩块含量之间存在近似线性关系，而最大剪切模量与围压之间存在近似指数关系。S-RM 的动态剪切模量比的分布在相同的归一化剪切应变下呈现低分散。S-RM 的非归一化/归一化阻尼比随着剪切应变的增加而增加，整体呈现带状分布特征。S-RM 的动态剪切模量比和归一化阻尼比都可以通过归一化剪切应变的函数来评估。因此，S-RM 动态特性的四参数公式在决赛中被引入用于所有实际目的。