冻土三轴强度破坏准则的基本形式及其与未冻水含量的相关性

Basic Form of the Falure Criteria of Triaxial Strength of FrozenSoils and its Relativity to Unfrozen Water

在分析围压作用下冻土强度特征和冻土物理一土学性质某些变化的基础上，认为冻土强度包络线的基本形态可按抛物线分析处理，直线包络线和水平包络线是特定条件下抛物线包络线的特定段冻士强度包络线偏离摩尔一库仑线其中的一个根本原因是，围压作用下孔隙冰部分压融和土的冻结点下降，引起其中未冻水含量增加．通过分析，提出偏离值△Ｔ与未冻水含量变化 Ｗｕ的关系模型。

On the basis of analysis of thestrength characteristics and changes in some physical-mechanical properties of frozen soils underconfining pressure, the foundamental shape ofthe strength envelope is considered as a parabolicOne. Straight or horizontal envelope is a particalarsection of the parabola under specific condition.A reason that strength envelope of frozen soils deviates from Mohr-Coulomb straight is an increasein unfrozen water due to compression-thawing ofa part of pore ice and depression of thefreezing temperature of soil. By analysing, the paper presents relative model between the strengthdeviation AT and the increment of unfrozen water△Wu, and discovers that △τ is just linearly relatedto product of △Wu. and△σc.