Evaluation of Contribution Rate of Fines on Cyclic Strength of Sands with Various Kinds of Fines

摘要

In most design codes, soils are classified as either sand or clay, and appropriate design equations are used to represent their behaviour. However, sand-clay mixtures, which are typically referred to as intermediate soils, cannot be easily categorized as either sand or clay and therefore a unified interpretation of how the soil will behave at the transition point, i.e., from sandy behaviour when fines are few to clay behaviour at high fines content, is necessary. In this paper, the cyclic shear behaviour of sand and fines mixtures with various plasticities was investigated by considering variations in fines content and compaction energy, while paying attention to the void ratio expressed in terms of sand structure. Then, by using the concept of equivalent granular void ratio, the contribution of fines on the cyclic shear strength of the soil was estimated.