Hyperbolic models for a 2-D backfill and reinforcement pullout

C. C. Huang, H. Y. Hsieh, Y. L. Hsieh

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


A series of direct shear tests were performed using an idealised two-dimensional test medium consisting of rhombically stacked steel rods to facilitate displacement computations for reinforced slopes using a force-equilibrium-based finite-displacement method. A series of pullout tests using extensible and stiff reinforcement with various embedment lengths (Lt) were also performed. Modelling for the non-linear behaviour of shear stress-displacement and pullout force- displacement relationships was performed using hyperbolic models. In modelling shear stress- displacement relationships for the steel rod backfill, a linear Mohr-Coulomb failure envelope was assumed for the investigated range of confining pressures. It was found that model parameters for the initial shear stiffness, namely K and n, are significantly different from those for ordinary soils because of the regular and dense packing of the steel rods, but are advantageous as a backfill material for model tests because of its consistency and repeatability. Results of hyperbolic curve fitting for the pullout force-displacement relationship indicate that the model parameters describing non-linear and pressure-dependent behaviour of reinforcement pullout, namely Kt, m, and Rt, are functions of Lt: The modelled hyperbolic shear stress-displacement relationships and the pullout force-displacement relationships are in good agreement with the experimental ones and are applicable for simulating the behaviour of model slopes consisting of steel rod assemblies.

Original languageEnglish
Pages (from-to)168-178
Number of pages11
JournalGeosynthetics International
Issue number3
Publication statusPublished - 2014 Jun

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology


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