里底水电站坝顶上下游水平变形机制分析

Analysis on Horizontal Deformation Mechanism of Dam Crest of Lidi Hydropower Station

里底水电站蓄水后进入正常运行阶段,坝顶向下游水平变形呈现出持续缓慢增长状态,一度达到25 mm。通过坝顶上下游水平变形监测值统计模型,分析了变形影响因素和规律,建立了整个坝段混凝土结构三维有限元模型,分析水压力和结构自重等荷载产生的变形量级和规律。三维有限元分析表明:水压力和结构自重等产生的荷载变形是由结构直接发生的水平变形和刚体性倾斜变形组成;坝顶上下游水平变形呈现出正弦函数式来回、缓慢增加状态,未来数年的变形增加值很小,并趋于稳定。

Lidi Hydropower Station has commenced normal operation after impoundment,and the horizontal deformation of the dam crest to the downstream shows a continuous and slow growth,and the deformation once reaches 25 mm.Based on the analysis of the monitoring values of the upstream and downstream horizontal deformation of the dam crest,through analyzing the influencing factors and laws of the deformation,The 3D finite element model of the concrete structure of the whole dam section is established to analyze the magnitude and law of deformation caused by water pressure,structural dead weight and other loads.The 3D finite element analysis shows that the load deformation caused by water pressure and structure self-weight is composed of direct horizontal deformation and rigid oblique deformation of the structure.The horizontal deformation of the upstream and downstream of the dam crest presents a sine function back and forth and slowly increasing state,and the deformation increase in the next few years will be small and tend to be stable.In addition,the deformation The statistical analysis of deformation monitoring data shows that after the reservoir reaches a relatively stable water level,the main factors affecting the horizontal deformation of the dam body are temperature,followed by water level change,and then timeliness;Three dimensional finite element analysis shows that the load deformation caused by water pressure and self weight of the structure is composed of horizontal deformation and rigid inclined deformation directly occurring in the structure.The horizontal deformation of the upstream and downstream of the dam crest presents a sine function back and forth and slowly increasing state,and the deformation increase in the next few years will be small and tend to be stable.