基于土石坝动力特性的坝料动力参数反演

采用现行的室内外试验方法确定的土石料动力参数与实际坝料的动力参数有何差异是人们关心的问题之一。提出了基于土石坝动力特性的坝料动力参数反演方法，并使用该方法反演了一个假想混凝土面板堆石坝的坝料动力参数，证明该方法是可行的，计算精度基本满足实际工程要求。利用紫坪铺面板堆石坝在汶川地震中的余震加速度响应信息，反演了坝料的最大动剪切模量系数K和指数n。结果表明，由室内动三轴试验得到的坝料最大动剪切模量系数K值偏小，建议进一步研究予以修正。

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.