Abstract: Three-dimensional finite element stress and strain analysis was conducted for the core rock fill dam founded on deep covering layer and the change of stress path of rock fill dam and foundation during dam construction and inundation period were studied. The results are concluded as follows: in both dam construction and inundation periods, the stress path within dam body and foundation can be approximated to linear changes. The two ratios basically remain constant namely the increment ratio between major and minor principal stresses and the increment ratio between partial and spherical stresses and they varied with dam filling building period and inundation period. The magnitude of ratio changed with position and surrounding of materials placed. These research results provide the basis for relevant tests of earth dam and facilitates the establishment of constitutive model for further study of stress deformation of core rock-fill dam. 

Key words: geotechnical engineering, core rock-fill dam, three-dimensional finite element, stress path, stress increment ratio

摘要： 对某深厚覆盖层上心墙堆石坝进行了三维有限元应力应变计算，分析了堆石坝及地基在填筑期及蓄水期的应力路径变化特征。研究表明：无论是填筑期还是蓄水期，坝体及地基内的应力路径可近似为线性变化，大主应力与小主应力增量之比以及偏应力与球应力增量之比均基本保持常数；两个比值在填筑期与蓄水期不相同，且比值的大小还与该点的位置、所处材料区域环境有关。研究成果为进行土石坝相关试验提供了依据，同时也为进一步研究心墙堆石坝应力变形分析的本构模型提供了参考。

关键词: 岩土工程, 心墙堆石坝, 三维有限元, 应力路径, 应力增量比