A Seepage Simulation Method Based on Finite Element-Discrete Element CT Reconstruction of Coal Body

Abstract

The invention discloses a seepage simulation method based on finite element-discrete element CT reconstruction of coal body. The three-dimensional data volume of the coal body is obtained through industrial CT scanning, and then the three-dimensional reconstruction is performed and the "island block" is removed to obtain a real A general 3D geometric model invoked by simulation software. By using the discrete element simulation method, write a coal body fracture discrimination algorithm to determine whether the coal body is deformed or even broken under the action of hydraulic stress. Migrate with the water flow in the coal body, and carry out the numerical simulation of the water seepage pressure field, seepage velocity field and coal water increment at the same time, to show the deformation and fracture of the coal body and the moisture content of the porous medium coal seam during the water injection process to the greatest extent. the movement rules.

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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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 current research on water seepage is based on finite element or discrete element analysis alone, and finite element is difficult to realize coal fracture, and discrete element cannot accurately describe the seepage process and water increment data

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