改进DB-IWHR模型及其在尾矿库溃坝影响分析中的应用  

Improved DB-IWHR model and its application in influence analysis of tailings dam break

作　　者：沈鸿杰 徐力群[1] 刘子茜 SHEN Hongjie;XU Liqun;LIU Zixi(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《水利水电科技进展》2022年第5期64-70,共7页Advances in Science and Technology of Water Resources

基　　金：国家重点研发计划(2019YFC1510802);广东省水利科技创新项目(2020-04)。

摘　　要：为预测尾矿库溃坝对下游的影响,基于修正的Shields曲线,改进了DB-IWHR模型中临界剪应力的计算,并通过唐家山堰塞坝实例验证了改进DB-IWHR模型具有更高的溃坝溃口和下泄流量过程演化精度。采用改进DB-IWHR模型及二维水动力模型建立了某尾矿库溃坝影响数值分析模型,预测了尾矿库漫顶溃坝时下游的淹没范围、淹没深度、淹没出现时间以及溃坝对下游关键敏感点的影响程度,分析了改进模型对溃口初始宽度及冲刷侵蚀参数的敏感性,结果表明:改进DB-IWHR模型结合二维水动力模型能较好地模拟尾矿库溃坝过程和下泄沙流演进过程,结果符合沙流演进的一般规律;该模型对于初始溃口宽度的敏感性不强,但对于冲刷侵蚀参数的敏感性较强。In order to predict the impact of tailings dam break on the downstream,an improved DB-IWHR model based on the modified Shields curve was established by modifying the calculation of critical shear stress.Through the example of Tangjiashan barrier dam,the higher accuracy of dam break and discharge process evolution of the improved DB-IWHR model was verified.A numerical analysis model for the impact of a tailings dam break was established by using the improved DB-IWHR model and a two-dimensional hydrodynamic model.The submerged range,depth and arrival time of dam break on the downstream were obtained,and the impact of the tailings dam break on the downstream key sensitive points was predicted.The sensitivity of the improved model to the initial width of the breach and erosion parameters was analyzed.The results show that the improved DB-IWHR model,combined with the two-dimensional hydrodynamic model,can better simulate the dam break process of tailings pond and the evolution process of sediment discharge flow.The results conform to the general law of sediment flow movement.The model is not sensitive to the initial breach width,but it is sensitive to erosion parameters.

关 键 词：尾矿库 溃坝影响 DB-IWHR模型 临界剪应力 二维水动力模型 

分 类 号：TV122.4[水利工程—水文学及水资源] X936[环境科学与工程—安全科学]