Back analysis of dynamic parameters of dam materials based on earth-rockfill dam dynamic characteristics

It is one of the concern problems what's the difference between the earth rockfill dynamic parameters determined in the laboratory and in situ and the real dynamic parameters of the dam materials. The earth-rockfill dynamic parameters back analysis approach based on earth-rockfill dam dynamic characteristics is presented. The material dynamic parameters of the hypothetical faced rockfill dam are back analyzed; and the results verify that the method is feasible, the calculation precision basically satisfies practical engineering requirements. Meanwhile, according to the Zipingpu concrete faced rockfill dam acceleration response information in the aftershock of Wenchuan earthquake, maximum dynamic shear modulus coefficient K and exponent n of the dam materials dynamic parameters are back analyzed. The results indicate that dynamic shear modulus coefficient K of the dam materials which obtained from laboratory dynamic triaxial test is smaller than true value; and it is suggested to adjust.