堆石料状态相关最终流变模型及工程应用OA

The rheological properties of rockfill materials are a primary factor contributing to the post-construction settlement of a rockfill dam,and improving compaction quality can reduce such settlement effectively.In this study,large-scale triaxial creep tests are conducted on rockfill specimens with different initial void ratios.We develop a compaction state-dependent final rheological model considering the void ratio effect,and examine the influence of compaction quality on the long-term deformation of a rockfill dam.The results indicate the rheological behavior of rockfill materials depends significantly on the compaction state-the smaller the initial void ratio,the bigger the attenuation rate of creep velocity and the smaller the final creep deformation.The dilatancy equation of the modified Cam-clay model well describes the rheological dilatancy relationship of rockfill materials,and the rheological critical dilatancy stress ratio decreases exponentially with the void ratio.Our final rheological model,equipped with 5 parameters,can uniformly characterize the final rheological behavior of rockfill materials under different compaction states;It is applicable to refined simulations of the effect of spatial variability in compaction quality on the long-term deformation of a rockfill dam.Compaction quality imposes a remarkable influence on the post-construction settlement of rockfill dams-the larger the initial void ratio,the more significant the increase in settlement,while the growth of downstream displacement is relatively smaller.