دانلود رایگان مقاله انگلیسی مدلسازی یکپارچه رفتارهای خاک قبل و بعد از روانگرایی جریان - الزویر 2018

ABSTRACT

Flow liquefaction of soil involves a phase transition process from solid to fluid. A constitutive model that can describe the soil behaviors of both the solid and fluid phases in a unified way was proposed. The constitutive model adopts a phase transition criterion to detect the onset of flow liquefaction and associates an elastoplastic relation and a fluid relation in a single framework. The simulated results demonstrated that the proposed model can describe the fundamental behaviors of soil in both the solid and fluid phases with a smooth transition from soil-like behavior to fluid-like behavior during the phase transition process.

7. Conclusions

This paper presents a preliminary study regarding the unified modeling of soil behaviors before/after flow liquefaction. The main conclusions of this study are as follows:

(1) The entire process from a solid phase to a fluid phase in flow liquefaction can be divided into three stages, i.e., the solid stage, the phase transient stage, and the fluid stage. In the solid stage, the soil behaves in an elastoplastic manner; in the fluid stage, the soil exhibits fluid-like behaviors; and in the phase transient stage, the characteristics of soil behavior changes from solid-like to fluid-like gradually.

(2) A phase transition criterion based on Hill’s stability theory [31] was proposed to detect the onset of flow liquefaction. The application of the criterion exhibits that only loose sand can trigger a phase transition under undrained monotonic and cyclic triaxial loading conditions, indicating that flow liquefaction only occurs in loose sand. For medium-dense sand and dense sand, the phase transition criterion will not be satisfied under the same loading condition.