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Method for predicting permeability of coal under stress loading conditions based on CT scans

A technology of CT scanning and stress loading, applied in the direction of permeability/surface area analysis, using stable tension/pressure to test material strength, measuring devices, etc., to achieve the effect of ensuring accuracy, high accuracy, and overcoming severe distortion

Active Publication Date: 2019-01-15
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to solve the technical problem of visually describing the internal seepage distribution of deformed coal samples and effectively predicting the change of coal permeability under different stress conditions, the present invention provides a method for predicting coal permeability under stress loading conditions based on CT scanning , the specific technical scheme is as follows:

Method used

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  • Method for predicting permeability of coal under stress loading conditions based on CT scans
  • Method for predicting permeability of coal under stress loading conditions based on CT scans
  • Method for predicting permeability of coal under stress loading conditions based on CT scans

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Embodiment 1

[0037] A method for predicting coal permeability under stress loading conditions based on CT scanning, comprising the following steps:

[0038] A. Make coal sample specimens, conduct uniaxial compression experiments, and conduct CT scans on coal sample specimens at the same time;

[0039] Wherein, the coal sample is a cylinder, and the uniaxial compression test uses an in-situ tension, compression and temperature control experimental device; Axial compression, the loading speed of the same coal sample is constant.

[0040] In this step, the scan voltage, scan power and field of view are first determined according to the X-ray stability, coal sample size, coal sample X-ray attenuation fraction and exposure time before the CT scan; Rotating and scanning at a constant speed, the detector captures the X-rays emitted by the X-ray source and passes through the coal sample, and stores the CT scan image in the form of electrical signals.

[0041] B. Use the DTM digital terrain model...

Embodiment 2

[0051] The implementation steps of the method for predicting coal permeability under CT scanning based on stress loading conditions provided by the present invention include: using a nanoVoxel-3502E scanner and an in-situ tension and compression control experimental device to conduct different tests on multiple groups of coal sample specimens. CT scanning under stress loading conditions to obtain structural CT scanning images of coal samples during compression. The obtained CT scan images are used to establish a three-dimensional numerical model through Simpleware software, so as to convert the CT scan images of the deformed coal body structure into a numerical model with visual features, so as to facilitate the intuitive description of the internal seepage distribution of the coal body. The seepage condition setting of coal body structure is set through HyperMesh software, mainly including air field simulation and water field simulation. Ls-dyna software is used for simulatio...

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Abstract

The invention provides a method for predicting the permeability of coal under stress loading conditions based on CT scans, and solves the technical problem of calculating the permeability of deformedcoal. The method comprises the following steps: A, Making a coal sample, conducting a uniaxial compression experiment, and performing CT scans on the coal sample; B, performing threshold segmentationby adopting a digital terrain model method to obtain a threshold value of the coal sample, and importing CT scan images into a modeling software to establish a three-dimensional numerical model; C, importing the three-dimensional numerical model into a finite element analysis software and setting seepage conditions; D, applying a plurality of pressure gradient values nabla P to the three-dimensional numerical model, setting an initial flow velocity v0, adjusting the nabla P and the v0 parameters to obtain a plurality of seepage models; E, importing the seepage model into a finite element software for simulation and calculation to obtain a calculation result; And F, importing the calculation result into a data processing software, extracting the seepage velocity at equal intervals along theseepage direction, obtaining the relationship between the seepage velocity and the pressure gradient, and calculating the permeability.

Description

technical field [0001] The invention relates to the technical field of coal seam water injection seepage, in particular to a method for predicting and calculating coal body permeability under stress loading conditions based on CT scanning. Background technique [0002] In the process of coal mine production, coal seam water injection is required to comprehensively control the actual mine production problems such as dust pollution of working flour, coal and gas outburst, rock burst, spontaneous combustion, and softening of coal body, and seepage after water injection is the most common in nature. physical phenomenon. Under a certain pressure difference, the ability of rock to allow fluid to pass is called permeability. Permeability is a parameter that characterizes the ability of soil or rock to conduct liquid. Its size is related to porosity, geometry of voids in the direction of liquid penetration, particle size and arrangement And other factors, the permeability is used t...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N15/08
CPCG01N3/08G01N15/0826G01N2203/0641
Inventor 王刚江成浩程卫民孙路路刘义鑫范酒源
Owner SHANDONG UNIV OF SCI & TECH
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