宁夏黄河段水库泥沙淤积对大坝防渗与结构安全影响研究

以宁夏黄河段某水库为例,在对其泥沙淤积原因进行总结分析的基础上,对其淤积情况下大坝渗流分析、结构分析及抗震安全分析进行了有限元计算。研究表明:(1)泥沙淤积情况下大坝渗漏量减小,大坝稳定性增强,抗震安全系数增大;(2)泥沙淤积导致水库有效库容减小,水库建筑物无法正常工作,水库下游生活用水和农业用水无法满足,应采取必要的清淤措施。

Study on sedimentation in a reservoir on Ningxia Reach of Yellow River influence on dam seepage control and structural safety

By taking a reservoir on Ningxia Reach of the Yellow River as the study case， the finite element calculation is made on the analysis of the seepage， structure and seismic safety of the dam for it on the basis of analyzing and summarizing the causation of the sedimentation in it. The study result shows that：（1）the seepage is decreased along with the enhancement of the stability of the dam and the increase of the seismic safety coefficient under the condition of the sedimentation；（2）the sedimentation leads to the decrease of the effective reservoir capacity， thus the structures of the reservoir cannot normally operated， and then its downstream domestic water and agricultural water demands cannot be satisfied as well； for which the necessary desilting measures must be adopted.