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应用动力弹塑性分析方法对高土石坝的地震反应特性和破坏机理进行了系统研究。通过研究地震动作用下坝体的剪应变、永久位移以及网格变形的变化规律,并与振动台模型试验的结果进行对比,说明了坝体上部1/5范围内变形较大,竖向地震动对坝坡稳定性影响明显,验证了FLAC程序模拟高土石坝地震反应的合理性;同时分析了坝高、坝坡和地震动峰值参数变化对大坝破坏形态的影响,研究结果为大坝的设计、安全评价和抗震措施研究提供理论基础。
The elasto-plastic analysis method is applied to study the seismic response characteristics and failure mechanism of high embankment dam. By studying the law of shear strain, permanent displacement and deformation of the dam body under the action of ground motion and comparing with the results of shaking table model test, it is shown that the deformation of the dam body is larger than that of the upper part of the dam, The dynamic response to the stability of the dam slope is significant, which verifies the rationality of the FLAC program to simulate the seismic response of the high earth-rock dam. At the same time, the influence of dam height, dam slope and the peak parameters of ground motion on the failure mode of the dam is analyzed. The design, safety evaluation and anti-seismic measures provide a theoretical basis.