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基于唐家山堰塞坝坝料级配曲线,建立相应的物理模型,开展堰塞坝漫顶溃坝离心模型试验,并推导离心场下矩形薄壁堰堰流计算方法。详细分析了堰塞坝漫顶溃坝过程及溃决机理,同时根据试验得出的堰塞坝溃口流量及溃口顶宽发展过程曲线,对溃决机理研究结果做出进一步验证。结果表明:堰塞坝漫顶溃坝过程中,溃口横向扩展贯穿始终,由于大粒径颗粒在下游坝坡的残留,溃口下切发展停止时间较早,溃坝后期下游坝坡存在明显的粗化现象,且堰塞坝溃坝后较少出现全溃的情况,一般都存在一定的残留坝高,其最终溃口尺寸也应小于相同条件下的均质土坝。
Based on the grading curve of dam material of Tangjiashan dam, a corresponding physical model was established, and the centrifugal model test of damped dam was carried out. And the calculation method of rectangular thin weir weir flow in centrifugal field was derived. The process of collapse damming and the failure mechanism of damming dam are analyzed in detail. At the same time, the results of the research on the mechanism of collapse are further verified according to the experimental results of the development of the damming flow and the top of the dam. The results show that during the process of flood control and damming, the horizontal expansion of the breach pierces through. Due to the residual of large particle size particles in the downstream slope, Phenomenon, and the barrier dam less failure after the collapse of the situation, there are generally some residual dam height, the final breach size should be less than the same conditions under the homogeneous earth dam.