泥沙对水库渗流取水效能影响的试验研究

Experimental Research on Performance Impact of Sediment on Seepage Water Abstraction in the Reservoir

任何典型的山区河流,含沙量高,浑水分流难度大。位于山西省东南部的某供水改扩建工程,采用无砂混凝土管汲取河水和地下水,但含沙水流影响问题十分突出。结合工程实际,通过水工模型试验,探讨一定浓度的含沙水流在不同条件下对渗流集水效能的影响。实验研究和分析都表明:对于特定的渗流集水系统,水库渗流集水效能主要取决于工作水头的高低,含沙水流的过流时间,以及防冲层表面积沙厚度等因素。对于不同的渗流集水系统,综合渗透系数愈大,防冲层表面积沙厚度对渗流取水效能影响愈大。本研究成果对于水库渗流取水工程的设计、施工、运行提供了一定的实践和理论依据。

Based on the engineering practice, the seepage catchment system composed of no-fines concrete pipe with different permea- bility coefficients and filter material with different size is studied,, The influence of sediment laden flow with certain concentration on effects of seepage catchment under different conditions is analyzed. Both research and analysis show that the seepage catchment effect of the reservoir using a specific seepage collection depends primarily on the level of working head,the time of sediment-laden flow , the thickness of deposition on the surface of erosion fillet and other factors. For different seepage catchment systems, the greater comprehensive permeability coefficient, the greater influence on seepage catchment by the thickness of depositiorL These conclusions can supply a theoretical and practical basis for the technical problems of design, construction, operation in reservoir seepage catch- ment projects.