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Method for realizing parameter inverse analysis in block discrete element

A discrete element and anti-analysis technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of difficult accurate calibration of parameters, difficult and cumbersome mechanical parameters, etc., and achieve the effect of optimization

Active Publication Date: 2019-10-25
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the mechanical parameters of joints are difficult to obtain accurately, the traditional manual calibration method is repetitive and cumbersome. Using the back analysis method to automatically check the parameters will effectively solve the problem that the parameters in the block discrete element software are difficult to accurately calibrate.

Method used

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  • Method for realizing parameter inverse analysis in block discrete element
  • Method for realizing parameter inverse analysis in block discrete element
  • Method for realizing parameter inverse analysis in block discrete element

Examples

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Effect test

Embodiment

[0094] Taking the determination of the joint stiffness of the columnar jointed rock model as an example, the method for implementing parameter back analysis in the block discrete element of the present invention is exemplified.

[0095] 1. Use the particle swarm optimization algorithm to develop the parameter correction program Calbration.exe. The operation process of the program is shown in 2. The calculation method of the objective function in the program is:

[0096]

[0097] In the formula, σ phy p is the peak intensity of the physical experiment, ε phy p is the strain corresponding to the peak intensity in the physical experiment, σ num p is the peak intensity of the numerical experiment, ε num p is the strain corresponding to the peak intensity in the numerical experiment, E phy Model elastic modulus obtained for physical experiments, E num is the elastic modulus of the model obtained from numerical experiments.

[0098] 2. The numerical model of columnar joi...

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Abstract

The invention discloses a method for realizing parameter inverse analysis in a block discrete element, which comprises the following steps of: writing a parameter correction program based on an optimization algorithm, and setting an initial parameter and a target function; calling a reverse analysis starting file; calling a parameter correction program, and generating an initial command stream file containing numerical parameters according to the initial parameters; calling the initial command stream file to perform numerical calculation on the numerical model under the current parameter to obtain a monitoring result of the numerical model; calling a parameter correction program to correct the numerical parameters in combination with the current monitoring result, and updating the commandstream file; and returning to continue calculation or terminate calculation according to whether the updated command stream file contains a recursive algorithm. Cyclic calculation of the model is realized by using a recursive algorithm, and correction of numerical parameters is realized by calling a developed parameter correction program based on an optimization algorithm in the cyclic calculationprocess, so that parameter inverse analysis is realized in block discrete elements.

Description

technical field [0001] The invention relates to a method for realizing back analysis, in particular to a method for realizing parameter back analysis in block discrete elements, which belongs to the field of rock mechanics. Background technique [0002] Whether the parameters used in the numerical calculation are reasonable is one of the important factors to determine the accuracy of the calculation results. The main basis for the selection of numerical parameters is the measured data of physical experiments such as in-situ experiments or indoor experiments. Due to the experimental error and the randomness of the sample, the parameters obtained by the experiment are difficult to be directly applied, and sometimes some parameters are difficult to obtain through the experiment. Therefore, in order to improve the accuracy of numerical calculations and make the results of numerical calculations correctly reflect the phenomena in reality, it is necessary to check the numerical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06N3/00
CPCG06N3/006G06F30/20
Inventor 王环玲马行生徐卫亚王如宾孟庆祥
Owner HOHAI UNIV
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