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A Method for Determining Rigidity of Columnar Joint Rock Joints in Block Discrete Elements

A technology of columnar joints and rock joints, applied in the field of rock mechanics, 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: 2021-05-11
HOHAI UNIV
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  • Summary
  • 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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  • A Method for Determining Rigidity of Columnar Joint Rock Joints in Block Discrete Elements
  • A Method for Determining Rigidity of Columnar Joint Rock Joints in Block Discrete Elements
  • A Method for Determining Rigidity of Columnar Joint Rock Joints in Block Discrete Elements

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Embodiment

[0101] Taking determining the joint stiffness of a columnar jointed rock model as an example, the method of the present invention is exemplified.

[0102] 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:

[0103]

[0104] 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.

[0105] 2. The numerical model of columnar joint rock established by block discrete element software, such as image 3 .

[01...

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Abstract

The invention discloses a method for determining the stiffness of columnar joint rock joints in a block discrete element, comprising the following steps: writing a parameter correction program based on an optimization algorithm, setting initial parameters and an objective function; calling an anti-analysis startup file; calling a parameter correction program , generate an initial command stream file containing numerical parameters according to the initial parameters; call the initial command stream file to perform numerical calculations on the numerical model under the current parameters, and obtain the monitoring results of the numerical model; call the parameter correction program to correct the numerical parameters in combination with the current monitoring results, and Update the command flow file; return to continue the calculation or terminate the calculation according to whether the updated command flow file contains a recursive algorithm. The method uses recursive algorithm to realize the cyclic calculation of the model, and realizes the correction of the numerical parameters by calling the developed parameter correction program based on the optimization algorithm during the cyclic calculation process, thereby realizing the parameter back analysis in the block discrete element.

Description

technical field [0001] The invention relates to a method for determining the stiffness of columnar joint rock joints in block discrete elements, and 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 parameters. [0003] Back analysis ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/27G06N3/00
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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