【摘要】 针对坝体地震永久变形是控制高土石坝工程安全的重要因素之一,以200 m高的心墙堆石坝为例,采用中国水利水电科学研究院通过试验得到的堆石料、心墙料的动应力残余应变关系,基于三维有限元静动力分析,利用等效节点力法讨论了地震永久变形在不同动参数、峰值加速度和反应谱作用下的变形特性与分布规律。结果表明,在单一参数变化下,顺河向、竖向、坝轴向的永久变形等值线分布图基本保持不变,竖向最大永久变形发生在坝顶附近,坝顶1/3~1/2坝高区域内变化较为明显,峰值加速度、坝料模量衰减曲线和阻尼增长曲线的选取对结果影响较大。更多还原

【Abstract】 Permanent earthquake-induced deformation of dam engineering is one of the most important factors to control the safety of high earth-rockfill dam.Taking the 200-meters high core rock-fill dam for an example,the IWHR model is applied to establish the relationships between dynamic stress and residual strain on rock-fill materials and core wall materials.Based on the static and dynamic three-dimensional finite element analysis,the characteristics and distribution of the permanent deformation in different dynamic parameters,peak acceleration and response spectrum are discussed by using equivalent nodal force method.The results show that the contour maps of permanent deformation is almost the same under the single parameter change;maximum vertical permanent deformation occurs near the top of the dam;however,the values are different,especially in the region 1/3 to 1/2 height of the dam near the dam crest.Among these factors,peak acceleration and the selection of modulus decay curve and damping growth curve have large impact on the results.更多还原