River critical levee section washing safety analysis and bank slope stability judgment method

Abstract

The invention discloses a river critical levee section washing safety analysis and bank slope stability judgment method. The method comprises the steps of 1, generating a data set used for constructing a two-dimensional river channel water / sand model; 2, setting model calculation parameters and definite solution conditions according to river reach parameters in the research area, and constructing a two-dimensional water / sand numerical simulation model of the research area; step 3, setting various working conditions according to sand coming conditions under different flood conditions, simulating river water / sand transportation and river bed silt flushing of a research area by utilizing a two-dimensional water / sand numerical model, analyzing dangerous river beds before and after flood based on a simulation result, and respectively calculating river dangerous bank slope river bed depth flushing distance and river lateral erosion distance; and step 4, constructing a finite element model for seepage-stability analysis of the bank slope of the critical levee section, and quantitatively researching the relationship between each factor and the bank slope stability safety coefficient. According to the method, the stability of the riverway dangerous work bank slope under the action of water flow flushing is studied, and a quantitative means is provided for critical levee section stability evaluation.

Description

technical field [0001] The invention relates to the technical field of river channel flood control safety, in particular to a method for safety analysis and bank slope stability determination of dangerous river erosion. Background technique [0002] The river channel risk work is an important part of the river channel regulation project, and the stability problem caused by the erosion of the bank slope has always been an important content in the flood control safety. Due to the complex shape of the sandy river channel and the large mainstream swing, the anti-scourability of the dangerous bank slope is low. During the flood, it is easily affected by the erosion of the water flow, resulting in the erosion of the slope foot, resulting in the formation of steep slopes along the bank, which threatens the safety of dangerous workers. Therefore, under the current conditions, it is of great significance to study the safety analysis and stability judgment of river flood scour to ensu...

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Problems solved by technology

For the stability of bank slopes under the action of sandy water erosion, domestic and foreign studies are mainly based on hydrodynamics combined with soil mechanics models. However, in the analysis of the impact of sandy water flow on the safety of dangerous engineering erosion during flood seasons, there is currently a lack of a method that considers the various influencing factors. The method of judging the stability of river hazards based on comprehensive effects, the lack of hydrodynamic-soil mechanics models for the safety of hazards in the study of slope stability, and the lack of judging the stability of river hazards considering the scouring effect of sandy water in flood seasons, etc.

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