抽水蓄能电站混凝土面板堆石坝接缝变形数值分析OA

To evaluate the structural safety of face joint deformation of the concrete face rockfill dam for pumped storage power stations,the upper reservoir dam of Hezhou Pumped Storage Power Station was taken as the research object.A three-dimensional finite element model of the dam was established adopting the Duncan E-B constitutive model.Combined with the element birth-death technology and staged loading,the whole processes of layered dam filling,staged reservoir impoundment and seismic dynamic action were simulated,and the opening,shear and settlement deformations of vertical joints and peripheral joints of the face slab were systematically calculated.The results show that under static working conditions,the maximum opening of vertical joints reaches 7.3 mm after 5 years of operation,and the maximum opening,shear and settlement of peripheral joints are 12.7 mm,6.1 mm and 13.3 mm,respectively.Under the combined condition of design earthquake and normal pool level,the maximum opening of vertical joints is 8.0 mm,and the corresponding deformations of peripheral joints are 11.9 mm,7.6 mm and 14.6 mm.The joint deformations under all working conditions are distinctly lower than the allowable deformation control standards.The face joint deformation of the dam meets the strength and deformation requirements of the waterstop system,and no slab damage will occur,which can effectively guarantee the anti-seepage performance and long-term safe operation of the dam.