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
CN109211666AActive Publication Date: 2019-01-15SHANDONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
SHANDONG UNIV OF SCI & TECH
Publication Date
2019-01-15

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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.
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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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