基于定床模型的泥石流虹吸排水分流池清淤能力研究  

ANALYSIS ON THE SELF-DREDGING CAPABILITY OF SIPHON DRAINAGE POOL IN DEBRIS FLOW BASED OVER FIXED BED MODEL

作　　者：陈晓辉[1] 徐毅青[2] 孙红月[1] 张文君[1] 

机构地区：[1]浙江大学海洋学院,杭州310058 [2]浙江树人大学,杭州310015

出　　处：《工程地质学报》2016年第6期1096-1102,共7页Journal of Engineering Geology

基　　金：国家自然科学基金项目(41272336);浙江省教育厅项目(Z201122174)资助

摘　　要：泥石流的形成,必须同时具备丰富的松散堆积物、足够的水源和有利的地形地貌3个基本条件,强降雨是形成泥石流的主要动力来源。针对重力流形式截排水技术的不足以及暴雨来临时快速排水的需要,采用具有自清淤能力的水石分离虹吸排水技术,可有效提高泥石流治理的效率和耐久性。拦污格栅孔径选取以及虹吸排水系统设计是影响分流池清淤能力的关键。首先应用计算流体力学软件CFD建立三维数值模型,对分流池在虹吸作用下的水力特性进行分析,然后建立泥沙启动和悬浮数学模型,利用分流池的水力特性分析泥沙的启动和悬浮,从而建立虹吸分流池清淤能力的评价指标,并对泥沙随水流排出池外的3个必要条件进行分析。表明实际工程安装虹吸管时其进出口水头差应该在5m以上,且拦污格栅孔径不超过10mm。工程上可以用此指导实际泥石流防治中的虹吸分流池设计。The occuring of debris flow in the valley needs three basic conditions at the same time which are rich loose deposits,enough water and slope terrain. In view of the shortage of the gravity flow drainage technology and the need for the rapid drainage of the storm,then it uses the siphon drainage technology of self-dredging ability and water separation. So it can improve efficiency and durability of debris flows control. To choose the diameter of the barrier grid and design the siphon drainage system is the key to ensuring the dredging capability of drainage pool.Using computational fluid dynamics software CFD,a three-dimensional numerical model is established to analyze the hydraulic characteristics of the flow in the drainage pool first. Then mathematical model of sediment incipient motion and suspension is established. It can use the hydraulic characteristics of the flow in the drainage pool to analyze sediment incipient motion and suspension. So the evaluation index about dredging ability of siphon drainage pool is established. Besides,it analyses three essential conditions for sediment to be drained out of the pool with water. Itsuggests that when installing the siphon for the engineering,the water head difference between inlet and outlet should be above 5m,and the diameter of the barrier grid should be no more than 10 mm. This can guide the design of siphon drainage pool in practical debris flow prevention engineering.

关 键 词：泥石流 地表洪水径流 CFD 泥沙启动、悬浮 评价指标 

分 类 号：P642.23[天文地球—工程地质学]