Stability Analysis Of River Slope Under Fluid-solid Coupling

In recent years,with the increase of national infrastructure,there are more and more applications of various slopes,and relevant research results are also very rich.However,with the increasing difficulty of slope management,especially the mechanism research on the damage of water slope,there is no universally accepted set of mature theories.This makes research in this area extremely valuable.In terms of the mechanism of slope failure,the first is the theory of slope stability,with the traditional limit equilibrium method and the finite element method that rises with computer technology.And many scholars believe that the destruction of the river slope is a problem of multi-field coupling,and in many cases the coupling of the stress field and the seepage field.If the slope instability problem in this case is considered as a problem in rock mechanics and soil mechanics,and the influence of fluid mechanics is neglected,the analysis results are not comprehensive.The research direction of this paper is the stability of the river slope.Due to the particularity of the river channel—the distance in the horizontal direction is very long,but the expansion in the depth is small,and the environment of the engineering body is very special.There is water in the river for a long time.And there will be shipping passenger ships passing through,the overall project location is in the middle of the year and the dry season and the dry season,these conditions comprehensively determine the complexity of the problem to be studied.The research content of this paper is as follows:(1)Firstly,download and read a large number of relevant literatures,write the research status of the stability analysis of river slopes at home and abroad,and separately identify several factors affecting the stability of water slopes;(2)This paper first collects the geological data of the project,introduces the engineering geological overview of the project,and gives a brief introduction to the details of the stratum and design water level.It also briefly introduces the division of the water area in the construction area and the regional functions of each part.Summarize the special conditions of on-site construction.(3)The voyage width is defined and corrected,and the two-dimensional governing equation of the river slope is introduced,and the results of the two-dimensional flow mathematical equation are averaged in depth.Introduce the basic governing equations of turbulence and lay a theoretical foundation for numerical simulation.(4)The finite element numerical simulation based on strength reduction method is used to analyze the stability of typical slopes.The safety factors under stable seepage conditions under different water levels are simulated in three working conditions.The equivalent stress distribution,displacement and plasticity of slopes under different water levels are compared.Area penetration,slip zone distribution,etc.;stability analysis of slope when there is water head difference,comparative analysis of the influence of slope body to river channel seepage and river channel to slope body flow on slope stability;analysis of rainfall workers The stability analysis of the slope is compared with the distribution of the flow network and the distribution of the plastic zone under three rainfall intensities.(5)Under the condition of stable seepage,since the normal water level during the design of the river is 6m,when the water level in the river is 4m,5m and 6m,the safety factors of the slope are 1.2863,1.355 and 1.4362 respectively.And the result is that when the seepage direction occurs from the slope body to the river channel,the safety factor at this time is 1.2675.On the contrary,the safety factor of the slope is 1.655.It is proved that when the water level in the river channel is low,then the water flow is on the slope.The caries of the feet are enhanced.Under rainfall conditions,due to the infiltration of rainwater,the slope and the bottom of the slope easily become the penetration zone of the plastic zone.However,with the increase of rainfall intensity,the impact of rainfall on the river slope is reduced,and the infiltration is weakened,which is more manifested as the formation of slope runoff.