冻土蠕变的渐进屈服准则

A Progressive Yield Criteria on Creep of Frozen Soil

基于冻土蠕变的现象分析表明，冻土蠕变的破坏是由于冻土中非弹性变形积累的结果，在冻土的任何变形阶段都存在着非弹性变形。非弹性变形的积累在一定条件下导致了冻土渐进屈服的出现，渐进屈服反过来又促进了冻土蠕变的进一步增加。据此将冻土考虑为一种粘弹塑性材料，给出了一种表述冻土蠕变的渐进屈服准则。

Based on of analysis creep of frozen soil, it is considered that the creep failure of frozen soil is caused by accumulation of non elastic deformation. In any deformation stage of frozen soil, threr exists non elastic deformation whose acculumation causes appearence of the progressive yield under certain condition and in trun promotes further increase in creep. Accordingly, considering frozen soil as a viscoelastic plastic material, this paper gives a progressive yield criteria to describe the creep of frozen soil, meanwhile a creep equation describing the whole process of creep is obtained.