Method of Predicting Coal Permeability under Stress Loading Condition Based on CT Scanning

A technology of CT scanning and stress loading, which is applied in the direction of permeability/surface area analysis, using stable tension/pressure to test the strength of materials, measuring devices, etc., to achieve a wide range of applications, ensure accuracy, and overcome severe distortion.

Active Publication Date: 2019-12-03
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:

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  • Method of Predicting Coal Permeability under Stress Loading Condition Based on CT Scanning
  • Method of Predicting Coal Permeability under Stress Loading Condition Based on CT Scanning
  • Method of Predicting Coal Permeability under Stress Loading Condition Based on CT Scanning

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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

A method for predicting coal permeability under a stress loading condition on the basis of a CT scan, which solves the technical problem of the calculation of the permeability of deformed coal, the method comprising the steps of: A. making a coal sample specimen, and conducting a uniaxial compression experiment while simultaneously performing a CT scan on the coal sample specimen; B. using a digital terrain model method to perform threshold segmentation to obtain a threshold value of the coal sample specimen, and importing a CT scan image into modeling software to establish a three-dimensional numerical model; C. importing the three-dimensional numerical model into finite element analysis software and setting a seepage condition; D. applying a plurality of pressure gradient values ▽P to the three-dimensional numerical model, setting an initial flow velocity v0, and adjusting the parameters ▽P and v0 to obtain a plurality of seepage models; E. importing the seepage models into finite element software for simulation calculation to obtain calculation results; F. importing the calculation results into data processing software, extracting a seepage velocity equidistantly along a seepage direction to obtain a relationship between the seepage velocity and the pressure gradient, and calculating 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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Patent Type & Authority Patents(China)
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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