小浪底水利枢纽大坝变形特性及成因分析

阐述小浪底水利枢纽大坝的结构特点及变形特性,对大坝变形进行监测,监测结果表明,各监测点变化连续、平顺、无突变,且逐渐趋于稳定,但相同高程的下游测点位移量大于上游测点位移量。分析大坝变形成因,认为时效是引起大坝变形的主要因素;而引起大坝不均匀变形的主要因素包括水库初次蓄水、水位骤降、坝体分区材料差异、河床深覆盖层、施工速率快和库水作用力等。通过与设计值对比、工程类比以及对正常蓄水位变形量的预测分析认为,坝体变形不影响大坝安全稳定运行。

Analysis of properties and causes of deformation of the Xiaolangdi Hydro Project dam

The structural characteristics and deformation properties of the Xiaolangdi Hydro Project dam are described.The dam deformation was monitored and results show that measuring point displacement is continuous,smooth,and without mutation,and gradually turns out to be stable.At the same elevation,the measuring point displacement downstream is larger than it is upstream.Through analysis of deformation causes,it is suggested that age is the main factor causing recovered deformation.The main factors causing uneven deformation include initial water storage,rapid drawdown,material differences in the dam area,the deep overburden of the riverbed,rapid construction,and water force.Based on the value of design,engineering analogies and prediction analysis of deformation with normal water levels,the deformation does not affect the safe and stable operation of the dam.