Mechanical properties of poorly-graded sandy gravel with high content of fine particles in Poyang Lake area
A series of large-scale triaxial tests are conducted on the influence of particle grading and relative density on the strength and deformation characteristics of sandy gravel with high content of particles smaller than 5 mm.It shows that the compaction performance of sandy gravel decreases with the increasing mass fraction of particle less than 5 mm.Strength parameters and deformation parameters increase with the increase of the mass fraction of particles larger than 5 mm P5 and relative density Dr.The strength parameters,c,ψ,ψ0 and △ψ,increase linearly with the growth of P5 and Dr,and there is almost no interaction between influences of P5 and Dr on strength parameters.The test results also show that the Duncan E-B model parameters K and Kb increase with the growth of P5 and Dr,the effects of Dr on K and Kb are greater for sandy gravel with higher content of particles larger than 5 mm,and the effects of P5 on K and Kb are more significant for sandy gravel with higher relative density.The empirical formulas,considering the effects of particle grading and Dr,are proposed to predict mechanical properties and Duncan E-B model parameters,and the formulas have high precision in prediction of mechanical indexes of poorly-graded sandy gravel with high content of fine particles for overburden in Poyang Lake area.
sandy gravelparticle gradationstrength indexdeformationmechanical propertiesrelative densityPoyang Lake area
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