土石坝变形计算中的应力路径问题

通过试验资料，说明了应力路径对砂土的应力-应变关系的影响；从实测资料及有限元法计算的结果，分析了土石坝中应力路径的特点；然后介绍了部分现有在土石坝变形计算中考虑应力路径影响的方法；最后，通过砂土的等应力比及变应力比路径试验资料的分析，揭示了二者之间具有良好的相关关系，推导了变应力比路径下非线性弹性模型参数的计算方法，提出了在土石坝变形计算中考虑应力路径影响的分析方法。

Problems of stress path in the calculation of deformation of earth-rock dams

The influence of stress path on the stress-strain relationship of sand is illustrated by test information. Stress path characteristics of earth-rock dams are analyzed according to the test information and the results of finite element method. Some calculation methods of earth-rock dam deformation taking stress path into account are introduced afterwards. Finally, well relationship between the stress-strain curves under constant stress ratio and that of variable stress ratio is revealed by analying their test information. The computational method of nonlinear elastic model parameters under variable stress ratio is derived. The deformation analysis method of earth-rock dams considering the influence of stress path is presented.