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.