One-dimensional simulation method for scour and collapse process of tidal channel side wall

Abstract

The invention discloses a one-dimensional simulation method for a scour and collapse process of a tidal channel side wall. The method comprises the steps of establishing a one-dimensional tidal current shallow water equation according to tidal current model parameters, and obtaining a flow velocity and a tidal level; simulating an erosion hollowing process of a tidal current to the tidal channel wall according to the flow velocity and the tidal level, and obtaining a boundary line of the tidal channel wall eroded and hollowed by the tidal current; dividing a triangular grid of the tidal channel wall eroded and hollowed by the tidal current into a plurality of grid units according to the boundary line; solving an elastic mechanic balance equation by adopting a finite unit method to obtain a stress of each grid unit; and judging whether shear failure and tension failure occur to the divided grid units or not by adopting Mohr-Coulomb failure criterions, if yes, correcting the stress, judging whether a failure region after the shear failure and the tension failure occurs is through or not, and if yes, ending the simulation, otherwise, returning to solve the flow velocity and the tidal level. According to the method, a failure process of the tidal channel wall can be simulated, a failure type of tidal channel wall instability can be judged, and the failure region can be determined.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a one-dimensional simulation method for the erosion and collapse process of tidal trench side walls. Background technique [0002] The instability of the tidal wall involves two processes. First, the tidal current erodes and hollows out the lower part of the tidal wall to form a cantilever; then the cantilever loses stability and collapses under its own gravity. Because it frequently occurs in the process of tidal trench migration and swing, it has special significance to the evolution of tidal trenches, and then affects the stability of tidal flats. [0003] At present, there is no mature method for the stability calculation of tidal trench walls at home and abroad, but there are three main methods for the stability calculation of river bank walls: 1) the failure type is regarded as shear failure, and the section safety factor is considered; 2) the failure type is considered to ...

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Problems solved by technology

[0003] At present, there is no mature method for the stability calculation of tidal trench walls at home and abroad, but there are three main methods for the stability calculation of river bank walls: 1) the failure type is regarded as shear failure, and the section safety factor is considered; 2) the failure type is considered to be shear failure. The process is collapse around the axis, considering the critical width of the cantilever; 3) Calculate the stress distribution in the bank wall to determine the damage type, damage process and damage location

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