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A high-efficiency particle search and operation method for discrete element numerical calculation of rock and soil mass

A numerical calculation and geotechnical technology, applied in the direction of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of low calculation efficiency and large calculation amount, reduce operating frequency, increase speed, and accelerate iterative calculation efficiency effect

Active Publication Date: 2018-01-16
NANJING UNIV
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Problems solved by technology

[0003] In order to overcome the problem of large amount of calculation and low calculation efficiency of large-scale discrete element numerical calculation search algorithm

Method used

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  • A high-efficiency particle search and operation method for discrete element numerical calculation of rock and soil mass
  • A high-efficiency particle search and operation method for discrete element numerical calculation of rock and soil mass
  • A high-efficiency particle search and operation method for discrete element numerical calculation of rock and soil mass

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Embodiment Construction

[0038] figure 1 The overall structure and working principle of this method is characterized by applying the window method to obtain the optimal adjacent particle matrix, and controlling the operation of the window search algorithm through the displacement matrix.

[0039] Step 10 constructs the initial particle discrete element accumulation model, the total number of particles is m, and the particles are numbered continuously from 1 to m.

[0040] Step 11 obtains preliminary neighboring particles through space grid division calculation. Correspondingly attached figure 1 a is a schematic diagram of the grid in two dimensions, and the side length of the grid unit is W g , all particles are included in the mesh. With the dark particle P0 as the central particle, the black dotted line range is the adjacent grid, and the gray particles are the preliminary adjacent particles of P0, a total of 11.

[0041] Step 12 determines the optimal neighboring particles by establishing a par...

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Abstract

The invention provides a high-efficiency rock-soil body discrete element value calculation particle searching and operation method. The method comprises the following steps that optimum neighboring particles are searched on the basis of drawn space lattices and particle windows, and the searching algorithm operation is controlled and reduced through the accumulation particle displacement. For non-fluid value simulation such as rock-soil bodies, a displacement matrix control window searching algorithm is used, the searching algorithm generally needs to be operated once for tens of thousands of times of iteration, the speed of a discrete element value method is obviously accelerated, and the dynamic simulation of a rock-soil body large-scale particle system can be realized.

Description

technical field [0001] The invention relates to discrete element numerical simulation of rock and soil, in particular to a high-efficiency calculation method based on window search and particle displacement control. Background technique [0002] Discrete element method is a main numerical simulation method to solve the problem of discontinuity of rock mass. It can dynamically simulate large deformation and fracture damage of rock mass. Stable deformation mechanism of high slope, surrounding rock failure of deep underground engineering, mine caving mining, etc. Discrete elements decompose the model in space and perform iterative calculations in time, and the calculation amount is very huge. Discrete element calculation mainly includes two parts: searching the neighboring contact particles of each particle and iterative calculation of particle motion. Among them, the particle search calculation needs to find out the particles in contact with the current particle from the par...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/30
CPCG16Z99/00
Inventor 刘春施斌王宝军张丹索文斌梁修雨张驰
Owner NANJING UNIV