关键词: 尾矿库, 排洪系统, 斜槽, 盖板形式, 流态, 调洪演算, 泄流关系曲线

Abstract: Chute-type drainage facility is a common flood discharge facility for tailings pond.In order to optimize the chute section to achieve full discharge，a chute type drainage system is considered as a model to analyze the effects of cover arch angle and water depth on the flood discharge capacity of the drainage system by the control variable method.The results show that there exists an optimal relationship between arch angle and discharge capacity.Under the same water depth，and in the weir flow state of the discharge，both of the arch angle and the discharge volume have a linear monotone decreasing relationship.In semi-pressure flow state，both have a linear monotonically increasing.In the mixed flow state，both diplay as a curvilinear regression of shedding downward.Impact of arch angle on the flow pattern showed that：the smaller arch angle，the faster the flow state shifts from weir flow to semi pressure flow as the water depth increasing.When the arch angle is greater than a certain value，the flow state is directly transferred to the semi pressure flow from the weir flow below the cover without the state of weir flow above the cover.These relationships between arch angle and the discharge capacity can be applied to the optimization of the chute section.

Key words: Tailings pond, Flood discharge system, Chute, Chute cover form, Flow state, Flood routing, Leakage flow curve