Gradual change law of elastic mechanical parameters of roller compacted concrete dam

For the effects of vibration and age,the mechanical parameters of roller compacted concrete dam(RCCD) have gradual change characteristics in space and time,which make a complex variation on the mechanical parameters of RCCD.It is difficult to obtain accurately the mechanical parameters and interface thickness.In this paper,aiming at small difference of elastic modulus and creep among adjacent compacted layers,the determination method of the zone-merged age in RCCD is firstly studied,then considering the gradual change property of RCC in space,the elastic calculation parameter analysis model of typical roller compacted layer is established by using compound material mechanics,and the elastic calculation parameter analysis model of zone-merged body is established using zone-merged algorithm.Finally,on the basis of back analysis of zone-merged equivalent elastic mechanical parameters of RCCD,elastic gradual change parameters of RCCD are solved by using particle swarm optimization algorithm.The engineering example shows that the proposed method is feasible and effective.