复杂地基条件下混凝土挡水坝与土石坝结合部应力变形性态计算研究OA

When restricted by geological and topographic conditions in the design and construction of hydropower station dams,local condi-tions can be adopted:concrete dams are used on rock foundations,while earth-rock dams with better adaptability to foundation deformation are employed on soft foundations such as overburden layers.How to connect and combine these two different dam types and construct a com-plete and reliable seepage control system has long been a major concern for engineers and technicians.To clarify the stress and deformation behavior of the junction between concrete water-retaining dam and earth-rock dam,based on the L Hydropower Station,a combined connec-tion scheme of cutoff wall-concrete core wall-slope intercepting retaining wall is proposed.The three-dimensional finite element method is used to accurately simulate the stress and deformation behavior of the soil and concrete structures at the junction during construction,im-poundment,and earthquake conditions during the impoundment period.The results show that adopting the earth-rock dam type on the over-burden foundation effectively alleviates and transitions the differential foundation deformation.Except for a slight over-limit of tensile stress at the connection between the concrete core wall and the concrete dam under seismic conditions,the overall stress and deformation behavior of the junction is favorable.The proposed scheme of cutoff wall-concrete core wall-slope intercepting retaining wall provides a new idea for the connection between concrete dams and earth-rock dams,which can be used as a reference for similar projects.