非饱和黄土在真三维应力状态下的结构变化特性初探

Discussion on Properties of the Structural Variation of Unsaturated Loess under Condition of True Triaxial Stress

以应变综合结构势作为土结构性参数,对真三轴条件下的非饱和黄土的结构变化特性进行了初步探讨,分析结果表明:真三轴试验条件下非饱和黄土的结构性参数曲线与常规三轴试验条件下黄土结构性参数曲线具有相同的线形和变化特征;中主应力变化对黄土结构强度具有显著影响;真三轴试验条件下,周围压力和含水率对黄土结构性参数的影响规律同于它对常规三轴试验条件下黄土结构性参数的影响。

Properties of the structural variation of unsaturated loess under the condition of true triaxial stress are discussed by taking the strain comprehensive structure potential （strain-CSP） as the structural parameter of the loess. The analysis results show that the same curve shapes and the variation properties of the structural parameters of the soil exist both under the true triaxial condition and the routine triaxial stress condition, that the structure strength of the loess is obviously influenced by the change of intermediate principal stress, and that the variation law of the structural parameters affected by confining pressure and the water content are the same under the condition of true triaxial stress and the condition of routine triaxial stress.