小浪底水库水位变化与土石坝变形分析

Analysis on Water Level Variation of the Xiaolangdi Reservoir and Deformation of Rock and Earth Fill Dam

通过研究黄河小浪底水库变形监测特征点累计位移量与库水位升降的关系,表明:库水位周期性的急剧升降导致土石坝顺水流方向水平位移的周期性变化,土石坝具有"弹性";大坝在高水位压力下,受时效影响向下游方向运动,属非弹性变化;沉降是土石坝土体固结的结果,在库水位急剧升降时,受水位分量作用土体固结速率改变,沉降速率加快。

Through study on the relationship between accumulated displacement of characteristic point of deformation monitoring of the Xiaolangdi Reservoir on the Yellow River and rising and falling of the stage in reservoir region,it shows that periodic rapid rising and falling of the reservoir stage results in periodic change of horizontal displacement of rock and earth fill dam along with the flow direction and the dam has 'elasticity';b) under the pressure of high water level,the dam moves towards the downstream effected by valid time,belonging to non-elastic variation and;c) sedimentation is the result of soil mass consolidation of rock and earth fill dam.When the reservoir level rapidly rises and falls,the rate of soil mass consolidation is changed and the rate of sedimentation speeded up under the actions of water level component.