Seepage simulation method for constructing coal body based on finite element-discrete element CT (Computer Tomography)

A seepage simulation and finite element technology, applied in the field of mine rock mechanics, can solve the problems that the seepage process and water increment data cannot be accurately described, the macroscopic simulation cannot be reproduced, and the coal body fracture is difficult to achieve

Active Publication Date: 2017-07-18
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

However, as a typical porous media material, the essence of coal wetting is that water enters the many fine pores in the coal body, and the simulation from a macro perspective cannot reproduce this process for in-depth research
Moreover, most of the

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  • Seepage simulation method for constructing coal body based on finite element-discrete element CT (Computer Tomography)
  • Seepage simulation method for constructing coal body based on finite element-discrete element CT (Computer Tomography)
  • Seepage simulation method for constructing coal body based on finite element-discrete element CT (Computer Tomography)

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[0033] The present invention provides a seepage simulation method based on finite element-discrete element CT reconstruction of coal body. In order to make the purpose, technical scheme and effect of the present invention clearer and clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0034] The present invention provides a seepage simulation method based on finite element-discrete element CT reconstruction of coal body, such as figure 1 As shown, it includes the following steps:

[0035] Step 1. Scan the coal body parameters used for the test by CT technology, reconstruct the three-dimensional model with the real core pore space topology and geometric characteristics, and remove the island block, and export the general three-dimensional geometric model in STL format;

[0036] Step 2, using finite elem...

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Abstract

The invention discloses a seepage simulation method for constructing a coal body based on finite element-discrete element CT (Computer Tomography). The method comprises the following steps: performing industrial CT scanning to obtain a three-dimensional data body of the coal body, performing three-dimensional reconstruction, and removing an ''island block'' to obtain a general three-dimensional geometric model which can be called by simulation software; writing a coal body fracture discrimination algorithm by a discrete element simulation method, and determining whether the coal body is deformed, even fractured under the action of hydraulic pressure stress; meanwhile, realizing migration of coal body fragments formed after fracture in the coal body along with moisture flow based on an finite element simulation method by a mobile grid method; and performing numerical simulation of a moisture seepage pressure field, a seepage speed field and a coal body moisture increment at the same time in order to reveal deformation and fracture phenomena of the coal body and a migration rule of moisture in a water injection process of a porous medium coal bed to the maximum extent.

Description

technical field [0001] The invention relates to the field of mine rock mechanics, in particular to a seepage simulation method based on finite element-discrete element CT reconstruction of coal body. Background technique [0002] Coal seam water injection can effectively wet the coal body, release the elastic energy of the coal body, increase its plasticity, change the adsorption-desorption gas properties of the coal body, and have the effect of displacing gas. One of the common methods of highlighting with gas. In particular, high-pressure water injection in coal seams increases the effect of hydraulic fracturing on the basis of ordinary seepage, and increases the wetting effect of coal by creating new cracks. The whole process involves multiple disciplines such as computational fluid dynamics, fracture rock mechanics and fluid-solid coupling, and the process of numerical simulation is relatively complicated. [0003] At present, most of the numerical simulation studies o...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/06
Inventor 周刚徐茂邱磊马云龙冯博王家远
Owner SHANDONG UNIV OF SCI & TECH
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