【摘要】 由于目前高土石坝强震记录资料缺乏和其它试验技术的局限性,土石坝的地震模拟振动台模型试验仍是当前研究大坝结构地震残余变形特性和破坏机理的重要手段。本文利用大型振动台模型试验,研究两河口高土石坝模型坝的地震残余变形特性和在强烈地震作用下的破坏过程和状态,并类推分析原型高土石坝的地震残余变形规律和动力破坏模式。试验结果表明:地震作用下,心墙堆石坝的地震残余变形相对较小;坝体动力破坏的形式主要是河谷段、靠近坝顶坝坡的散粒体滑移和浅层滑动;多维地震动,对坝体的地震残余变形控制和动力稳定不利。基于试验结果和分析,建议在高土石坝抗震设计中,加强对河床坝段坝顶区的保护。更多还原

【Abstract】 Shaking table model test is the major technique to study the seismic responses of a high rock-fill dam because of the shortage in actual earthquake measurement data and the limitation of other test techniques.In this work,a large-scale model was tested to analyze the seismic residual deformation and dynamic failure mode of a high rock-fill dam under the conditions of extremely strong earthquake,and some responses of the prototype dam were predicted.The test results show that the core rock-fill dam has relatively smaller residual deformation and that the major failure patterns are featured by rocks rolling and surface-layer sliding on the dam slopes near the river channel.Multi-dimensional earthquake is an unfavorable factor to the control of residual deformation and dynamic stability.This study suggests that the protection of dam top area should be strengthened in anti-seismic design of rock-fill dam.更多还原