The Design And Optimization Of Revetment In Songhua River Main Stream Dyke Engineering

The Songhua River main stream is located in the high latitude of our country.It belongs to the seasonal frozen river,and the freeze-over period is relatively longer.The river basin is greatly affected by ice flow.Every spring when the ice melts,the river's thawing would form a large number of floating ice,resulting in different degrees of damage to the embankment project.Serious ones even go through the dyke and cause the flood.The study on the optimal design of the revetment structure of the embankment of the Songhua river can provide technical support for the research on the mechanism of the structure failure and the seasonal frozen river embankment protection.This paper is based on the research project of ice flow evolution mechanism and dyke protection technology in Songhua River main stream management project,directing at the design of the revetment structure for the Shengli Embankment of Songhua River,combined with the service environment characteristics of the existing ice prevention structure,aiming at the damage characteristics of the embankment structure.The new semi-slope revetment structure scheme based on underground continuous wall structure is proposed.With ABAQUS6.11 finite element software,the mechanical properties of the revetment structure under the action of ice load and earthquake load are studied,and the new design of the new type of revetment structure is completed.The specific research contents are as follows:(1)The existing revetment structure types and features of Songhua River Basin and the damage mechanisms caused by ice flow were investigated and analyzed.Considering the hydrological and environmental conditions in Songhua River Basin,combined with the construction requirements of seasonal frozen river water conservancy projects,according to the relevant specifications,the new structure of half-slope embankment shore structure optimal design were completed.(2)With ABAQUS finite element software,a new numerical model of bank protection structure was established.Considering the friction angle of the soil,the depth of the embedded structure,and the difference in the stress response and earth pressure distribution of the revetment structure at different distances from the wall to the shoreline,the numerical simulation static analysis on a new type of bank protection structure was completed.(3)Based on the results of static analysis of the revetment structure,the dynamic response analysis of the revetment structure included in the seismic force was performed.Three types of seismic waves(EI-Centro,Taft,and Northridge)were input to study the influence of different seismic characteristics and strength on the mechanical properties of the structure.The dynamic response analysis of the revetment structure included in the horizontal seismic force was completed.