对某土石坝进行了三维有限元应力应变计算，分析了土石坝在填筑期及蓄水期的应力路径变化特性。研究表明,无论是填筑期,还是蓄水期,坝体内各点都为等应力比的应力路径，大主应力与小主应力增量之比基本保持常数,但填筑期及蓄水期的比值大小不同，且该值大小与该点的位置和所处的材料分区有关。研究成果为进行土石坝相关试验提供了依据，也为研究适合于土石坝应力变形分析的本构模型提供了参考。

The stress and strain of an actual earth-rockfill dam were calculated based on three-dimensional finite element method, and the stress path during dam construction and impounding were studied. The result was concluded as follows: Every point inside the dam has a stress path of equal stress ratio both in construction stage and during impoundment period. The ratio between major and minor principal stresses increment basically keeps constant, while it varies with construction and impoundment periods, and the magnitude of ratio changes with position and material. The conclusion may provide the basis for the material test of dam and facilitate the study of constitutive model for the analysis on stress deformation of earth-rockfill dam.