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针对辽宁葠窝水库混凝土重力坝抗震问题,采用耦合的拉格朗日-欧拉有限元分析技术,建立了可考虑库水-坝体-基岩动力耦合效应的典型溢流坝段抗震分析数值模型。模型中,采用等效一致粘弹性边界模拟基岩的人工截断边界;采用混凝土弥散裂缝本构模型模拟混凝土的动力特性。根据烈度与地震动之间的关系,确定了水库坝体抗震设计的输入加速度峰值。据此,分析了在不同季节水位变化条件下坝体地震反应的基本特性。研究表明:完好的辽宁葠窝水库混凝土重力坝溢流坝段能满足8度的抗震设防烈度要求。地震下溢流坝段峰值位移出现在胖坝和瘦坝的坝顶迎水面位置处,胖坝的动位移较瘦坝动位移大。胖坝在闸墩与溢流堰交接处出现了拉应力最大值。有库水条件下,瘦坝峰值拉应力出现在坝趾处,无库水条件下,瘦坝最大拉应力出现在溢流堰与闸墩交接处。
Aiming at the seismic resistance of concrete gravity dam in Shenwo reservoir in Liaoning Province, a coupled Lagrangian - Euler finite element analysis technique is used to establish the numerical value of typical spillway dam seismic analysis considering the coupling effect of reservoir water, dam body and bedrock model. In the model, the equivalent truncated viscoelastic boundary is used to simulate the artificial truncation boundary of the bedrock. The concrete diffusion constitutive model is used to simulate the dynamic characteristics of the concrete. According to the relationship between earthquake intensity and ground motion, the peak value of input acceleration of aseismic design of reservoir dam is determined. Based on this, the basic characteristics of the seismic response of the dam under different water levels in different seasons are analyzed. The research shows that the intact spillway dam section of Shenwo Reservoir in Liaoning Shenwo reservoir can meet the seismic intensity requirement of 8 degrees. Under the earthquake, the peak displacements of the overflow dam section occur at the crest of the fat dam and the thin dam, and the dynamic displacement of the fat dam is larger than that of the thin dam. Fat dam in the pier and the weir overflow junction appeared maximum tensile stress. Under the condition of reservoir water, the peak tensile stress of the thin dam appears at the dam toe. Under the condition of no reservoir water, the maximum tensile stress of the dam appears at the junction of the weir and the pier.