面板堆石坝筑坝材料动力特性试验研究

某抽水蓄能电站上水库主坝为沥青混凝土面板堆石坝,坝址区地形地质条件复杂且处于强震区,需研究其坝体和坝基料的动力特性。采用清华大学大型高压多功能静动三轴试验机,对坝基和主要坝体材料进行了动弹性模量与阻尼比试验和动残余变形试验。试验结果表明,与普通堆石料相比,软岩次堆石料和覆盖层料的动弹性模量较低且变形较大,但其动应力应变关系与动变形特性同样可以分别用修正的黏弹性动本构模型和残余变形经验公式进行描述。此外,根据动力试验结果初步论证了利用软岩和直接在覆盖层上筑坝的可行性。

Experimental study of dynamic properties of materials of a faced rockfill dam

The main dam of the upper reservoir of a pumped storage power plant is an asphalt concrete faced rockfill dam located in strong earthquake region; so it is necessary to investigate the dynamic properties of the rockfill and foundation materials. The dynamic moduli, damping ratios and residual deformations of the main materials have been measured by using the large scale and multi-purpose static-dynamic triaxial test apparatus. The experimental results show that the dynamic moduli of soft rockfill and alluvium are somewhat less than those of ordinary rockfill; however, their dynamic stress-strain relationships and residual deformations may be still described by the modified nonlinear viscoelastic dynamic constitutive models and empirical formulae, respectively.