高心墙堆石坝蓄水变形和裂缝机理分析

Analysis of the Impoundment Deformation and Cracking Mechanism of a High Core Wall Rockfill Dam

我国高堆石坝建设正处于高潮期,其中高心墙堆石坝的坝高已达300 m级。结合实际监测资料的坝体变形分析对大坝变形机理的研究和工程设计具有重要的指导意义。结合某电站大坝的实际监测资料,分析初蓄水坝体各部位变形的变化趋势,并就此得出初蓄水对坝体变形的影响区域,分析了各部位变形的影响机理和坝体裂缝发生的机理及发生过程,并利用有限元方法进行了蓄水变形及裂缝的验证。

The construction of high rockfill dams is booming in China,and the height of core wall rockfill dams has reached the level of 300 m.Deformation analysis of the dam body based on practical monitoring data is of great significance for the study of the dam deformation mechanism and the engineering design.Based on the in-situ measurement data of a core wall rockfill dam,the deformation trends of different part of the dam body during the initial impoundment period are analyzed and the effect of the initial impoundment is determined.Then,the crack initiation and development mechanism of the dam body is summarized.At last,the impoundment deformation and the cracking mechanism are verified with finite element analysis.