ANALYSIS AND EVALUATION OF OPTIMIZING DESIGN FOR FOUNDATION EXCAVATION OF XILUODU SUPER-HIGH ARCH DAM

Analysis and evaluation on optimizing design for foundation excavation of super-high arch dams is one of the most important research fields in hydraulic engineering.It is also significant for engineering and scientific study,and for proposing new design criteria of super-high arch dam or revising arch dam design standard.An evaluation criteria,design concept and flow of optimizing of design are discussed for proposing the analysis and estimation system on optimization of design for foundation interface of super-high arch dam.Based on the study progress of analysis and evaluation on optimizing design for foundation excavation of super-high arch dams,a study on optimizing design for excavated foundation surface of Xiluodu Arch Dam is presented.By employing the 3D nonlinear finite element method and 3D geomechanical model test,different excavated foundation surfaces of Xiluodu Arch Dam including feasible scheme,optimizing scheme and comparative scheme,are analyzed and evaluated respectively.The investigation results demonstrated the feasibility of using III1,and III2 typical rock mass as excavated foundation surface of Xiluodu Arch Dam.The optimizing scheme of Xiluodu Arch Dam,compared with the feasible scheme,the excavation of foundation and concrete quantities of dam will decrease about one million cubic meters;as a result,nearly RMB 700 million of investment is saved.