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中文摘要：
国内外针对土石坝漫顶破坏机理和溃决过程开展了大量的研究工作,但针对黏土心墙这一土石坝主要坝型溃决机理及溃决过程的研究工作却开展的很少。研究提出能合理模拟黏土心墙土石坝漫顶破坏溃口发展时变过程数值计算模型对准确模拟黏土心墙坝溃决过程,正确评价其溃决致灾后果十分必要。从黏土心墙坝结构特征出发,根据实际溃坝调查和室内、现场溃坝试验资料,分析了黏土心墙坝漫顶溃决机理,在此基础上建立了一个描述黏土心墙坝溃口发展过程的数值模型。该模型较好地考虑了漫坝水流对下游坝壳冲蚀过程中黏土心墙滑动或倾覆失稳所引起的溃口间歇性增大现象。最后利用已发生溃决心墙坝的溃坝洪水资料验证了建议数值模型的合理性。
英文摘要：
Many researches on the mechanism of earth-rock dams due to overtopping failure and the process of break development have been carried out,but few involves the mechanism of clay core dams.It is necessary to present a numerical model to describe the gradual failure process of the clay core dam so as to evaluate the consequence due to dam break.Based on the characteristics of the clay core dam,the field survey data and model test results,the overtopping failure mechanism and the process of break development of the clay core dam are analyzed,and a numerical model is proposed.The intermittent break expansion phenomenon caused by sliding or overturning of clay core during the scouring process of downstream shell break-induced flows is considered.Finally,the validity of the proposed model is verified by the observation data of a clay core dam with sandy gravel.
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