瀑布沟砾石土心墙堆石坝初次蓄水期坝顶裂缝成因分析

摘要

利用瀑布沟大坝的现场监测变形资料,结合倾度分析方法,从时间与空间上初步分析了大坝初次蓄水坝顶的变形特性与纵向裂缝的产生原因.研究分析表明,瀑布沟大坝初次蓄水期间纵向裂缝的产生主要是堆石的湿化和水荷载作用引起,其在高水位时作用尤其明显,而与初始阶段的快速蓄水并无太大的联系;流变在蓄水初期作用对裂缝的产生影响不大,但后期可能会产生不利影响.%Based on the deformation monitoring data of Pubugou Dam during first water impounding period,the deformation properties and the causes of longitudinal cracks of dam crest are preliminarily analyzed from the dimensions of time and space by using inclination analysis method.The results indicate that,(a) the longitudinal cracks in crest are mainly caused by rockfill wetting and water pressure,especially in the condition of high water level,and there is no obvious relation with rapid reservoir impounding in initial stage;and (b) the rheology has less effect on the occurrence of cracks in initial impounding stage,but it may have negative effect on dam cracking in later stage.