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用沈珠江建议的双屈服面模型对洪家渡面板堆石坝进行了三维有限元分析 .计算中考虑到堆石材料的非线性和模拟运行过程 ,采用了逐级增量与不平衡力修正迭代相结合的算法 ,经与中点增量法的结果对比 ,表明该算法是有效的 .通过对堆石坝体在施工和逐级蓄水加载过程中的应力和变形分析 ,探讨了坝体中某些特定单元在运行过程中的主应力轴旋转状态 .对于坝体中部单元 ,在填筑过程中 ,主应力轴的偏转程度多在 10°以内 ;蓄水加载时偏转程度增加约2 0 % .而对于坝体上下游单元 ,主应力轴偏转则更加明显 .对τ σ3 平面、q p平面内的一些坝体单元的应力路径比较表明 ,不论是施工还是蓄水加载 ,q p 平面内的加载路径均较为明确
Three-dimensional finite element analysis of the Hongjiadu concrete faced rockfill dam is carried out with the double yield surface model proposed by Shen Zhujiang. Considering the nonlinearity and simulation of rockfill materials, the incremental and unbalanced forces correction The results show that the algorithm is effective by comparing with the result of midpoint incremental method.Based on the analysis of stress and deformation of rockfill dam during construction and gradual storage and storage, Some of the specific elements in the operation of the main stress axis rotation state.For the central dam unit, during the filling process, the main stress axis deflection of more than 10 °; water storage deflection increases by about 20 %, While the principal stress axis deflection is more obvious for the upstream and downstream units of the dam.The comparison of stress paths of some dam body elements in the τσ3 plane and qp plane shows that the load in the qp plane, whether it is construction or water loading, The path is more clear