EXPLANATION OF CYCLIC MOBILITY OF SOILS: APPROACH BY STRESS-INDUCED ANISOTROPY
EXPLANATION OF CYCLIC MOBILITY OF SOILS: APPROACH BY STRESS-INDUCED ANISOTROPY
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DOI：
10.3208/sandf.47.635
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发表时间：
2007-08
影响因子：
3.7
通讯作者：
Feng Zhang;B. Ye;T. Noda;M. Nakano;K. Nakai
中科院分区：
文献类型：
--
作者：
Feng Zhang;B. Ye;T. Noda;M. Nakano;K. Nakai
本文提出了一种新的本构模型来描述土在不同荷载条件下的力学行为。提出了土的应力各向异性发展和超固结变化的新的演化方程。将这两个演化方程与Asaoka等（2002）提出的土的结构性演化方程相结合，新模型不仅能描述单调荷载作用下土的力学行为，而且能描述不同排水条件下循环荷载作用下土的力学行为。特别关注了砂土在不排水条件下的循环荷载作用下的性状。即对于给定的不同密度的砂，极松散的砂可以不动而动，中密砂可以动而动，而密砂则不动，这主要取决于砂的密度、结构和各向异性。合适的模型应该在不改变其参数的情况下唯一地描述这种行为。目前的研究将显示所提出的模型的可能性。
In this paper, a new constitutive model is proposed to describe the mechanical behaviors of soils under different loading conditions. New evolution equations for the development of stress-induced anisotropy and the change of overconsolidation of soils are proposed. By combining systematically the above two evolution equations with the evolution equation for the structure of soil proposed by Asaoka et al. (2002), the newly proposed model is able to describe not only the mechanical behavior of soils under monotonic loading, but also the behavior of soils under cyclic loading with different drained condition. Special attention is paid to the behavior of sand subjected to cyclic loading under undrained condition. That is, for given sand with different densities, very loose sand may liquefy without cyclic mobility, medium dense sand will liquefy with cyclic mobility while dense sand will not liquefy, which is just controlled by the density, the structure and the anisotropy of the sand. A suitable model should uniquely describe this behavior without changing its parameters. Present research will show the possibility of the proposed model.