堰塞坝泄流槽断面型式离心模型试验研究

发布时间：2018-01-31 10:19

本文关键词： 堰塞坝离心模型试验泄流槽断面型式应急除险　出处：《岩土工程学报》2017年10期 　论文类型：期刊论文

【摘要】：基于唐家山堰塞坝坝料级配曲线,针对梯形、三角形和复式断面3种泄流槽断面型式,开展了堰塞坝漫顶溢流离心模型试验研究。分析不同除险断面型式对堰塞坝的泄流过程、总泄流量以及泄流后残留坝体几何尺寸的影响规律,并从水动力学的角度,对该泄流过程中泄流槽不同部位的水流特征进行了研究。试验结果表明,复式断面泄流槽不仅在初期泄流效率高、峰值流量小,而且残留坝体较低,总下泄水量最大,流量过程曲线具有"矮胖型"的特征,可迅速、最大程度的降低堰塞湖水位,同时能够有效的减轻因堰塞坝泄流给下游河道造成的防洪压力,是一种相对安全、高效的堰塞坝除险处置方法。
[Abstract]:Based on the material gradation curve of Tangjiashan Weir and slug dam, three types of discharge channels are designed for trapezoidal, triangular and compound sections. The centrifugal model test of overtopping overflow of Weir and plug dam is carried out, and the influence of different risk removal section on the discharge process, the total discharge and the geometry size of the residual dam body after discharge are analyzed. From the point of view of hydrodynamics, the characteristics of water flow in different parts of the discharge channel are studied. The experimental results show that the discharge efficiency is high and the peak flow rate is small in the initial stage. And the residual dam body is lower, the total discharge water is the largest, the discharge process curve has the characteristic of "short and fat type", it can reduce the water level of the barrier lake quickly and to the maximum extent. At the same time, it can effectively reduce the flood control pressure of downstream channel caused by the discharge of Weir, plug and dam, which is a relatively safe and efficient method to eliminate the risk of Weir, plug and Dam.
【作者单位】：重庆交通大学水利水运工程教育部重点实验室;南京水利科学研究院岩土工程研究所;水利部土石坝破坏机理与防控技术重点实验室;
【基金】：国家自然科学基金项目(51709025,51379129,51539006) 重庆交通大学国家内河航道整治工程技术研究中心暨水利水运工程教育部重点实验室开放基金项目(SLK2015B09,SLK2016B07) 国家科技支撑计划项目(2015BAK09B01)
【分类号】：TV131.61
【正文快照】： 3.水利部土石坝破坏机理与防控技术重点实验室,江苏南京210029)堰塞坝是在一定的地质地貌条件下,由于地震、降水等原因引发河道两侧山体发生滑坡、崩塌、泥石流而形成的阻塞河道的堆积体[1]。堰塞坝由于其特殊的物质组成和结构特征,极易发生溃决,并且绝大多数堰塞坝最终都将发

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