Strength–dilatancy and critical state behaviours of binary mixtures of graded sands influenced by particle size ratio and fines content

Binary granular soil mixtures, as common heterogeneous soils, are ubiquitous in nature and man-made deposits. Fines content particle size ratio two important gradation parameters for a binary mixture, which have potential influences on mechanical behaviours. However, experimental studies drained shear behaviour considering the whole range of fines different ratios scarce literature. For this purpose, series triaxial compression tests was performed dense silica sand mixtures with four to investigate systematically effects Based these tests, strength-dilation critical state were examined. It observed that both significant influence stress–strain response, void ratio, friction angle, maximum dilation peak angle stress–dilatancy relation. The underlying mechanism discussed from perspective kinematic movements at level.