筑坝堆石料的等效动剪切模量与等效阻尼比

The equivalent dynamic shear modulus and equivalent damping ratio of rockfill material for dam

采用新研制的高精度大型三轴仪 ,对若干堆石坝工程的十余种堆石料进行了等效动剪切模量与等效阻尼比试验 ,在对本文试验结果和国内外 8座堆石坝现场弹性波试验结果进行综合分析的基础上 ,给出了最大等效动剪切模量的估算式及归一化等效动剪模量、等效阻尼比与动剪应变幅依赖关系的范围 .对试验资料不充分的情况 ,按本文建议的公式或取值范围对堆石材料的动力参数进行估算 。

The equivalent dynamic shear modulus and equivalent damping ratio of rockfill material in several hydro projects are experimentally investigated using large scale triaxial test apparatus.On the basis of experimental results and elastic waves measured from 8 dams both in China and abroad,a formula for evaluate the maximum dynamic equivalent shear modulus and a reference range of the modulus are proposed.In this range the normalized dynamic equivalent shear modulus and dynamic damping ratio are related to the amplitude of dynamic shear strain.The dynamic parameters of rockfill material can be estimated according to the proposed formula and the reference range,in case the test data is not enough.