【摘要】 山谷型尾矿库洪水漫顶溃坝浆体的流动规律受沟谷地形影响显著,目前研究多侧重于“V”型沟谷,而对“U”型沟谷研究较少。为探讨“U”型沟谷的山谷型尾矿库漫顶溃坝浆体流动规律,依托某实际工程建立了精细化的三维溃坝有限元模型,研究了溃口位置、溃口大小对溃坝浆体流动规律的影响。研究表明:“U”型沟谷条件下溃坝浆体下泄过程可分为启动、流通与流动渐止3个阶段,相较于“V”型沟谷,浆体横向扩展能力显著增强,淹没范围呈扇形趋势展开;“U”型沟谷尾矿库溃口大小一定时,溃口位于河床位置,浆体下泄动能更大,是溃坝最不利工况;溃口位置一定时,随着溃口宽度增大,对下游造成的影响有明显增大趋势。研究成果为类似尾矿库的风险防控与应急预案编制提供了理论参考。更多还原

【Abstract】 The flow law of flood overtopping dam-break slurry in valley-type tailings reservoir is significantly affected by valley topography. At present,most of the research focuses on V-type valleys,while there are few studies on U-type valleys. In order to explore the flow law of overtopping dam-break slurry in valley-type tailings reservoir with U-shaped valley,a refined three-dimensional dam-break finite element model was established based on a practical project,and the influence of dam-break location and size on the flow law of dam-break slurry was studied. The results show that the discharge process of dam-break slurry under the condition of U-shaped gully can be divided into three stages:start-up,circulation and gradual flow. Compared with V-shaped gully,the lateral expansion ability of slurry is significantly enhanced,and the submerged range shows a fanshaped trend. When the breach size of the U type gully tailings reservoir is constant,the breach is located in the riverbed position,and the kinetic energy of the slurry is greater,which is the most unfavorable working condition of the dam break. When the breach position is fixed,with the increase of the breach width,the impact on the downstream has a significant increasing trend.The research results provide a theoretical reference for risk prevention and control and emergency plan preparation of similar tailings reservoirs.更多还原