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LIU Mengcheng, GAO Yufeng, LIU Hanlong. Study on shear dilatancy behaviors of rockfills in large-scale triaxial tests[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(2): 205-211.
Citation: LIU Mengcheng, GAO Yufeng, LIU Hanlong. Study on shear dilatancy behaviors of rockfills in large-scale triaxial tests[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(2): 205-211.

Study on shear dilatancy behaviors of rockfills in large-scale triaxial tests

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  • Published Date: February 14, 2008
  • On the basis of the results of large-scale triaxial tests on typical rockfills for the construction of dams,their shear behaviors under different void ratios or confining pressures including the relationship of(σ1/σ3)-εa and εv-εa,and relationship of dilatancy ratioζ and plastic shear strain εsp were analyzed.It was shown that ① For the rockfills with determined particle grading,the conversion between shear dilatancy and shrinkage of the samples depended upon a critical initial void ratio(e0)crit and critical consolidation pressure(σc)crit;② The shear dilatancy ratioζf at the failure of the samples could be a criterion by which whether shear dilantancy appeared or not could be judged.By means of the nonlinear fitting of the results of triaxial tests,the relationship of(σ1/σ3)-ε a and the relationship of εvp-εsp were described by a uniform formulation,and then the equation of stress-dilatancy and the formulation of dilatancy ratioζf at the failure,which depended upon the initial state of the samples,were proposed respectively.So a criterion was established on the formulation of shear dilatancy ratio ζf which depended upon the initial void ratio e0 and confining pressure σc of the samples.

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