MECHANISM OF LARGE POST-LIQUEFACTION DEFORMATION IN SATURATED SAND

概要

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A new mechanism of large post-liquefaction shear deformation in saturated sand was established on the physical basis that the shear deformation is governed by two types of volumetric strains due to dilatancy, i.e., an irreversible dilatancy component, ε_<υ.ir>, and a reversible dilatancy component, ε_<υ.re>. It was found that : 1) the shear strain is composed of a shear strain component depending on change in effective stress γ_d, and a shear strain component independent of effective stress γ_o; 2) post-liquefaction γ_o-value is triggered principally in the state of zero effective confining stress, and its current magnitude has a nearly unique relationship with the preceding maximum shear strain γ_<max> for sand of a given density; and 3) γ_d is determined by a good correlation existing between dε_<υ.re>/ dγ_d and deviator-isotropic stress ratio, q/p'. Based on the formulation for the above experimental findings and stress-dilatancy concept, a new approach is proposed to evaluate the large post-liquefaction shear strain γ=(γ_o+γ_d) in saturated sand. The results predicted by the proposed method compared favorably with experimental observation.
社団法人地盤工学会の論文
1997-06-15