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针对邓肯—张模型在土石坝有限元计算中不能反映中主应力对土体强度和变形的影响,分别采用邓肯—张E-B原始模型及其改进模型对双江口大坝进行三维有限元静力计算,研究了考虑中主应力影响的改进邓肯—张E-B模型对双江口大坝有限元静力计算结果的影响。对比结果显示,由改进模型计算得到的坝体沉降减小,水平位移增大,表明考虑了中主应力的改进邓肯—张E-B模型使土体模量及泊松比增大,可更好地反映土体的应力—应变特性。
For Duncan - Zhang model, the influence of middle principal stress on soil strength and deformation can not be reflected in the FEM calculation of earth - rockfill dams. Three - dimensional finite element static analysis of Dunkang - Zhang EB model and its improved model are carried out respectively. , The influence of the improved Duncan-Chang EB model on the finite element static calculation results of Shuangjiangkou Dam considering the influence of the principal stress is studied. The comparison results show that the dam settlement calculated by the improved model decreases and the horizontal displacement increases, indicating that the improved Duncan-Chang EB model, which takes into account the middle principal stress, increases the soil bulk modulus and Poisson’s ratio, Reflects the stress-strain characteristics of soil.