Abstract:The strength and deformation characteristics of coarse-grained soils and reinforced coarse-grained soils were studied based on large-scale triaxial shearing tests.Experimental results showed that the stress-strain relationships of coarse-grained soils and reinforced coarse-grained soils are similar under different confining pressures

both showing strain hardening.Reinforcement effect is not obvious when the axial strain is small

and the reinforcement effect gradually starts to work with the increment of axial strain.Reinforced coarse grained soil has a larger cohesion c

while the inner friction angel φnearly keeps changeless.And it’s axial strain decreases

volumetric strain increases.Applicability analysis of Duncan-Chang model showed that Duncan-Chang model can reflect the tangent elastic moduli of reinforced coarse-grained soils

but can’t reflect its deformation well.A function was put forward to fit axial strain and lateral strain

and a volumetric strain function was established for coarse-grained soils and reinforced coarse-grained soils

and then the volumetric strain of the soil-sample was predicted.