三轴应力状态下土的结构性变化特性

应变综合结构势是一种新的、可以方便应用于复杂应力状态下的土结构性参数。根据应变综合结构势参数的定义，用三轴剪切试验中原状黄土（或人工结构性黄土）、重塑黄土以及饱和黄土的应力-应变曲线求得原状黄土（或人工结构性黄土）的结构性参数曲线，分析了三轴试验条件下非饱和黄土的结构变化特性。结果表明，应变综合结构势作为一种新的土结构性参数，它与应力综合结构势参数对同一影响因素的变化趋势基本相同，可以合理解释土体在三轴剪切试验条件下土结构性参数曲线所表现出的基本特征，更适合描述在三轴复杂应力状态下土体结构性的变化和发展。

Variation properties of soil structure under triaxial complex stress condition

The strain comprehensive structure potential (strain-CSP) is a new structural parameter of soils and it can be applied to complex stress condition conveniently. Based on the definition of strain-CSP, the structural parameter curves of intact loess or men-made structural loess are obtained using the data of stress-strain curves obtained from triaxial tests on intact loess (or men-made structural loess)，disturbed loess and saturated loess, and structural variation properties of unsaturated loess are analyzed under triaxial complex stress conditions. The results have shown that the strain-CSP as a new structural parameter of soils, its changing trend relative to a certain affecting factor is the same as that of the stress comprehensive structure potential. Using this new structural parameter of soils, the fundamental features of soils structural parameter curves under triaxial complex stress condition can be explained reasonably, and the variation and development of soils structural characteristics in 3-D complex stress state can be described suitably.