Lightweight expanded clay aggregate (LECA) is a geomaterial that is low in density, porous, and has an enamel surface. A series of unconfined compression and resonant column tests were performed to understand the dynamic performance of LECA. Testing results show that the uncemented LECA is poorly graded but possesses a stable internal structure. The initial shear modulus, shear modulus reduction, and increase in damping with shear strain of uncemented LECA exhibits pressure-dependence. However, for cemented LECA, the increase in cement content and confining pressure leads to significant increases in the strength and stiffness, as well as greater nonlinearity in the dynamic shear modulus reduction. An empirical power law was recommended to describe the relationship between initial shear modulus and unconfined compressive strength. Cemented LECA exhibited larger damping characteristics than uncemented LECA for the range in strains investigated. The minimum damping ratio of LECA with a high cement content may exceed 5.0%, and generally increases with increasing confining pressure. Empirical equations were proposed to describe the modulus and damping ratio trends of LECA at low strains, and these relationships were compared to other geomaterials. The results were placed in the context of the application of LECA as an engineered backfill.

轻质膨胀粘土骨料（LECA）是一种密度低，多孔且具有搪瓷表面的土工材料。进行了一系列无限制的压缩和共振柱测试，以了解LECA的动态性能。测试结果表明，未胶结的LECA分级较差，但内部结构稳定。未胶结的LECA的初始剪切模量，剪切模量降低以及阻尼随剪切应变的增加表现出压力依赖性。但是，对于胶结的LECA，水泥含量和围压的增加会导致强度和刚度的显着提高，以及动态剪切模量降低的更大非线性。建议使用经验幂定律来描述初始剪切模量与无侧限抗压强度之间的关系。在所研究的应变范围内，胶结的LECA表现出比非胶结的LECA更大的阻尼特性。高水泥含量的LECA的最小阻尼比可能超过5.0％，并且通常随着围压的增加而增加。提出了经验方程来描述低应变下LECA的模量和阻尼比趋势，并将这些关系与其他土工材料进行了比较。将结果放在LECA作为工程回填的应用环境中。并将这些关系与其他土工材料进行了比较。将结果放在LECA作为工程回填的应用环境中。并将这些关系与其他土工材料进行了比较。将结果放在LECA作为工程回填的应用环境中。