Accumulation body seepage erosion damage simulation calculation method based on LBM-DDA coupling

Abstract

The invention discloses an accumulation body seepage erosion damage simulation calculation method based on LBM-DDA coupling. The method comprises the following steps: inputting DDA blocks of an LBM flow field to obtain an LBM-DDA fluid-solid coupling model; calculating the one-way effect of the DDA block on the LBM flow field; calculating the LBM flow field momentum; calculating the fluid drag force of the LBM flow field acting on the DDA block; performing contact search on the DDA blocks; calculating large displacement and large deformation of the DDA block; and judging whether the maximum calculation time is reached or not; if so, obtaining a numerical simulation result of seepage erosion damage. According to the method, the LBM method serves as a fluid calculation part, and the DDA method serves as a solid dynamic calculation part, so that the processing and solving of fluid-solid coupling of seepage erosion damage of the accumulation body based on the LBM method and the DDA method are achieved, and thereby a seepage damage water-force coupling action mechanism of the accumulation body is simulated more truly.

Description

technical field [0001] The invention belongs to the field of fluid-solid coupling numerical simulation of the interaction between fluid and rock-soil body, in particular to a simulation calculation method for accumulation body seepage erosion damage based on LBM-DDA coupling. Background technique [0002] The gravel interbedded geological body formed by the combination of bedrock, ancient landslide, modern landslide body and Quaternary sedimentary body is called accumulation body. Its material structure is chaotic, lacks organic matter, and has the characteristics of poor sorting, poor intergranular binding force, and strong permeability. Under the seepage action of rainfall, the internal finer soil and rock blocks are easily eroded. With the erosion of fine blocks, the accumulation body will undergo overall deformation and settlement until it is destroyed, which will cause geological disasters such as landslides, mud-rock flows, and collapses, seriously threatening human li...

AI Technical Summary

Problems solved by technology

Seepage and erosion experimental research can provide a lot of valuable research data, but the shape and size of the thick blocks in the accumulation body are different, the pore structure of the seepage field is very complex, and the physical modeling is difficult

And because the physical experiment is limited by the size, the experimental results are often affected by the size effect, and cannot be directly applied to engineering practice.

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