土质心墙堆石坝应力和变形研究

论述了考虑坝体流变和上游坝壳料浸水变形特性的土质心墙堆石坝应力和变形的计算方法，以黑河水库大坝为例，采用三维有效应力法对坝体的应力和变彤特性进行了分析研究，结合已有的坝体变形观测资料，反馈分析了坝体流变模型参数，并对坝体的后期变形进行了预测，重点研究了心墙应力、拱效应和心墙开裂等特性。

RESEARCH ON STRESS-STRAIN BEHAVIOUR OF SOIL CORE ROCKFILL DAM

A numerical method in terms of effective stress is proposed to analyse the stress-strain behaviour in earth rockfill dams and a double-yield-surface elastoplastic constitutive model is employed to describe the stress-strain relationship of materials in dam. The three-element Merchant viscoelastic model is applied to calculate the time-dependent visctoplastic deformation of materials, and a wetting deformation calculation model is proposed to calculate the watering deformation of rockfills during the first impounding. The strain caused by rheological deformation and watering deformation of materials in dam is taken as initial strain. Research is carried out on the stress-strain behaviour of Heihe earth rockfull dam. Based on the observed deformation data, the parameters of rheological model are confirmed by back-analysis. The parameters of wetting deformation model are confirmed empirically. The effect stresses, arch effects and soil cracking in the earth core are emphatically investigated, and the settlement at the top of the dam is forecasted.