Soil Erosion Performance Of Dyke Burst In The Lower Yellow River

The Yellow River down-stream levee is formed gradually on the basis of the original China Dam, embankment quality questions are commonly existed, it is apt to happens "smash", "outburst".Therefore, it's necessary to conduct dyke Burst soil erosion experiment and researching the lower Yellow River to master soil erosion characteristics, providing scientific theoretical and technical support for flood controling and security management, With the major theoretical and practical value. Although many researchers home and abroad have carried out the researches on Burst model, theoretical studies and numerical simulations,there haven't formed a unified test method on soil erosion experimental studies, and not formed a systematic research. Therefore, acording to the analysis on basic physical mechanics properties of soil which was from the Lower Yellow River Dike, different representative soil was selected in order to carry out scouring experiment. Through testing various experiment parameters, the variation law with time of washing load and soil particle size distribution curve were researched, the failure process of Dyke Burst ware researched were researched.Main research subjects and results obtained from experiment are as follows:(1) Combining with the laboratory conditions, a set of simple and repetitive laboratory equipment was developed,and carried out 32 groups of soil erosion experiment by this equipment. Using MENSI-GS200 laser scanner in three-dimensional for the first time in the hydraulic model tests, the scanning method and data processing methods were studied.(2) Experiment on the 32 groups model in different erosion conditions, researched the impact of soil,dry density,velocity,the distance of Prefabricated and the length of pre-bore holes on erosion amount and the curve of grain size;obtained scouring variation with time under different conditions, analyzed clay content and average particle size variations with time.The results show that:The erosion amount changes badly which influenced by the flow velocity, kinds of soil, but the influence is smaller by density; The most significant influences are velocity and density on the change of clay content and average particle size, then is soil, scour location have a minimal impact on changes of the clay content and average particle size.(3) Changes features of entrance area, the change process of scour erosion process and the failure process of dike breach were anlyzed through scanning data processing, analyze changes features of entrance area, the change process of scour erosion process and the failure process of dike breach; So The failure process of dike burst is divided into three stages,discussed its variation and explore the affect factor of dike burst with the process of soil erosion damage in this paper.