Block discrete element model generation method based on progressive finite element mesh and Voronoi segmentation method

Abstract

The invention relates to a block discrete element model generation method based on a progressive finite element mesh and a Voronoi segmentation method and belongs to the field of numerical calculation. The method includes the steps of S1, drawing modeling information by using CAD; S2, reading the modeling information and generating a high-quality, continuous and progressive triangular mesh; S3, generating a discrete model and outputting a final calculation file; S4, integrating steps S1-S3 into software, so that a DDA block discrete element model, a UDEC block discrete element model and a 3DECblock discrete element model which are directly used for calculation are generated directly by only drawing CAD drawings and defining the minimum size of blocks. A specific block size distribution rule or size data can be defined, the block discrete element models which satisfy specific spatial distribution are generated, and the problem that a given size distribution rule cannot be generated according to current methods is solved.

Description

technical field [0001] The invention belongs to the field of numerical calculation, and relates to a block discrete element model generation method based on a progressive finite element grid and a Voronoi segmentation method. Background technique [0002] The block discrete element regards the rock mass as a discontinuous discrete medium composed of rocks and joints. In the calculation, large displacement, rotation, sliding and even block separation are allowed inside the rock mass. Meanwhile, the block and joint parameters are macroscopic parameters, which can be compared Realistically simulate nonlinear large deformations in jointed rock masses. The current block discrete element method is widely used in geotechnical engineering fields such as landslide dynamics, tunnel excavation, masonry stability, and rock mass fissure seepage. However, the calculation cost of block discrete elements is high, and the calculation accuracy and efficiency are highly dependent on the numbe...

AI Technical Summary

Problems solved by technology

These are difficult to be solved well in the existing block discrete element model generation methods

[0006] 2. There are too many discrete element blocks, the mass distribution is uneven, and it is difficult to gradually distribute the size of complex engineering blocks.

[0007] Because the spatial distribution of block sizes cannot be considered, in specific geotechnical engineering problems, the existing discrete element block sizes are basically the same, which makes the number of blocks in the existing block discrete element calculations too large under the premise of meeting a certain accuracy , and the quality of block generation is difficult to guarantee

At the same time, it is impossible to generate progressive high-quality block discrete element models

[0008] 3. The generation of discrete block models for complex geotechnical engineering is complex

[0009] Without professional modeling software and methods, modeling usually generates multiple structural surfaces for cutting one by one. These methods require a certain software foundation, and the operation is complicated and the generation efficiency is low

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