Simulation of fracturing law of heterogeneous coal caused by supercritical CO2 explosion
Received:December 05, 2020  Revised:December 21, 2020
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DOI:10.7511/jslx20201205001
KeyWord:supercritical CO2  gas explosion  heterogeneous coal  weak plane  stress wave  crack propagation
        
AuthorInstitution
陈鹏 辽宁工程技术大学 力学与工程学院, 阜新
孙可明 辽宁工程技术大学 力学与工程学院, 阜新 ;青岛理工大学 理学院, 青岛
张宇 辽宁工程技术大学 力学与工程学院, 阜新
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Abstract:
      In order to reveal the fracturing law of heterogeneous coal with cleats caused by supercritical CO2 explosion,a Matlab code was developed to identify the actual coal image and obtain the geometric information of its cleats.The geometric information was related to the heterogeneous physical parameters of coal and imported into Abaqus to realize the finite element representation of heterogeneous coal.SPH and FEM were used to simulate the fracture process of heterogeneous coal caused by supercritical CO2 explosion.The dip angle of the weak plane,the distance from the weak plane to the center of the blast hole and the initial stress on the fracturing effect of the coal gas explosion was obtained.The simulation results indicated that the initial stress has a guiding effect on the generation and propagation of the main cracks,and the cracks propagate along the direction of the maximum initial stress.For a given dip angle of the weak plane,the weak plane is closer to the blast hole,the size and density of the cracks passing through the weak plane is greater;when the weak plane is farther from the blast hole,and the weak plane completely blocks the cracks propagation.For a given distance from the weak plane to the center of the blast hole,the greater the dip angle of the weak plane,the greater the blocking effect of the weak plane on cracks propagation,the smaller the size and density of the cracks passing through the weak plane,the smaller the stress wave transmittance.When gas explosion on site increases the permeability of coal,the location of gas explosion hole and blasting parameters should be rationally arranged in consideration of the cleats and in-situ stress characteristics.