Geotechnical material mechanical parameter identification method

Abstract

The invention provides a geotechnical material mechanical parameter identification method. A digital speckle correlation method is used as a test observation means, a surface displacement field obtained through analysis in an experiment loading process is used as a measured value, a displacement field obtained through a finite element unit method is used as a simulation value, and an error between the displacement measured value and the simulation value is used as a target function; mechanical parameters of the geotechnical material to be inverted, are selected and the value range of the mechanical parameters are determined. reverse calculation is performed on the mechanical parameters of the geotechnical material by utilizing an improved artificial fish swarm optimization algorithm, whether the globally optimal solution reaches a set error limit or the algorithm is ended is judged when the globally optimal solution reaches the upper limit of the number of iterations, and an optimal value capable of representing the mechanical parameters of the geotechnical material is acquired. By adopting the scheme of the invention, the mechanical parameters of the geotechnical material can be quickly and accurately determined in real time, the problems that the measurement points are difficult to select and are easily influenced by various factors are effectively solved, and the fault tolerance and precision of mechanical parameter inversion are improved.

Description

technical field [0001] The invention relates to the technical field of testing mechanical parameters of rock and soil materials, in particular to a method for identifying mechanical parameters of rock and soil materials based on a digital speckle correlation method and a finite element method. Background technique [0002] With the application and promotion of computing technology in geotechnical engineering, numerical analysis and calculation methods involving geotechnical materials have been widely used in engineering design, construction, operation and maintenance, and engineering disaster prediction and prevention of tunnels, slopes, and foundation pits. Applications. However, although the numerical analysis method has a reasonable calculation model, it is very sensitive to the mechanical parameters of rock and soil materials, so the mechanical parameters of rock and soil materials are important factors that affect the accuracy of theoretical analysis and numerical simul...

AI Technical Summary

Problems solved by technology

Due to the limitation of engineering cost, test site and test time, the available data of the field test method is very limited, and it is impossible to provide accurate mechanical parameters for engineering design and construction and predicting the stability of the project.

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