Research On Flow Characteristics Of Self-silting Tube And Effect Of Base-Tube Structure Revetment

Thebankcollapse is aquite prevalentand prominentgeologic hazard alongthe middle-downsteram Yangtze River,which highly menaces the safety of the dikes and cities alongtheriver.At present,the Yangtze River bank collapse has taken many positive revetment measures,but with the engineering practice shows that the limitations or defects still exist a lot of revetment method.Therefore this article intends to existing research,on the basis of practice,to explore a new low cost protection means.Based on the comprehensive analysis of domestic and foreign scholarsresearch result,the mechanism of bank collapse are summarized,and collecting and analyzing of the different characteristics of revetment engineering and problems.begin to overcome the defect of the existing revetment engineering,put forward membrane bag concrete andautomatic siltdimmersed tube comprehensive methods are advanced automatic immersed tube is a long tube which into the coastal river bed,flows through the energydissipationdevice which inside on long tube,sediment is automatic collected in the tube,sediment siltd in the tube,Increase weight.Then a long tube base into a whole to form a "Base-tube" and combined with membrane bag concrete to use,aim to replaceriprap revetment,to prevent collapse hazards,reach long-range and efficient to protect the river bank.To calculate the range of flow velocity aim to siltd sedimentbased on Dou Guoren theory of sediment calculation,and analyse the meehanism of the automatic siltd immersed tubebased on the fluid mechanics theory.To determine the best model of automatic siltd immersed tube based on hydraulic model test.Selecting a length ofthe Yangtze River on Jiujiang Mianchuan town for outdoor model test to test the the effect of silt.Using the FLOW-3D software to simulationand analysis the transformation offlow velocity and characteristic inside the automatic siltd immersed tube,further discusses the mechanism of automatic siltd immersed tube,tset it effect to decrease flow velocity;Simulation different structuralforms of base-tube impact on the surrounding water and sediment,as the base of Project implementation.