Study on influencing factors of cracking radius range caused by liquid CO2 phase transition in coal seams

doi:10.16265/j.cnki.issn1003-3033.2021.04.008

Abstract

Abstract: In order to improve efficiency of gas drainage of coal seam and reduce accident of mine gas disasters, grasping characteristics of influence of different factors on cracking radius of liquid CO₂ phase change. Based on equivalent conversion of TNT released by liquid CO₂ gas explosion energy, evolution model of coal blasting damage was established. LS-DYNA software was used to simulate physical properties of coal seams(coal in-situ stress σ, coal tensile strength S_t, gas pressure P_g)and influence of pore size d on fracturing radius L of liquid CO₂ phase change. Primary and secondary order of blasting influencing factors was analyzed by using grey-relational-analysis theory. The results show that liquid CO₂ phase change fracturing radius has a positive relationship with gas pressure and borehole diameter, and has a negative relationship with coal seam in-situ stress. In-situ stress has the greatest influence on fracturing radius and borehole diameter has a strong influence on fracturing radius and gas pressure has a slight influence, change of coal tensile strength has little effect on fracturing radius range.

Key words: cracking caused by liquid CO₂ phase transformation, cracking radius range, influencing factor, trinitrotoluene (TNT) equivalent conversion, grey correlation analysis

CLC Number:

X936

JIA Jinzhang, LI Bin, WANG Dongming. Study on influencing factors of cracking radius range caused by liquid CO₂ phase transition in coal seams[J]. China Safety Science Journal, 2021, 31(4): 57-63.

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Study on influencing factors of cracking radius range caused by liquid CO₂ phase transition in coal seams

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