【摘要】 我国西南强震区兴建高坝抗震问题非常突出。振动台模型试验是研究土石坝动力反应和震害机理、验证动力计算方法的有效手段。论文以300m级的双江口超高心墙堆石坝为依托,介绍了大型振动台模型试验,并利用等效线性模型对模型坝进行了数值计算。通过对试验值和计算值的比较,验证了等效线性模型能较好的模拟坝体的动力反应。两种方法均反映出坝体最危险位置在下游坝坡0.75～0.85H处,且空库比满库的地震反应明显偏大。但是,有限元难以准确模拟松散边坡的表面放大效应,可能导致计算结果偏小;且等效线性方法属于非线性粘弹性模型,不能反映先期振动和坝体破坏过程。更多还原

【Abstract】 Anti-seismic design for high dam construction in southwest China is a crucial issue.Shaking table test is an effective tool in studies of dynamic response and earthquake damage mechanism and also for verification of dynamic analysis methods.This paper presents the design and measurements of shaking table tests for the Shuangjiangkou super-high core rock-fill dam and an equivalent linear method for simulation of the model dam’s dynamic response with a comparison of the measured and simulated data.Results of both methods show the most dangerous position on the dam’s downstream surface of 0.75~0.85H and the dam’s weaker dynamic responses in the full storage case,while FEM that is not accurate enough to simulate large deformation on incompact slope,produces lower values than the measurements.As a non-linear visco-elastic model,the equivalent linear method can not simulate pre-vibration case or failure process of a dam.更多还原