Simulation research on law of coal fracture caused by supercritical CO2 explosion
SUN Keming
XIN Liwei
WANG Tingting
WANG Jinyu
Abstract：To investigate supercritical carbon dioxide explosion stress wave and coal fracture laws which were caused by detonation gas,pressure history curves of the nozzle were determined by the method of experiments at different temperature and pressure,and parameters of Jones-Wilkins-Lee state equation were inverted.An impact dynamics model of coal fracture was established and the simulation of supercritical carbon dioxide explosion process was carried out based on smoothed particle hydrodynamics.The distribution of explosion pressure was obtained in the process of gas explosion.The destruction rule and formation mechanism of crushing zone and fracture zone was revealed.The results show that the fracture morphologies were consistent with experimental results.Smash area was formed around the blast hole,caused by impact load exceeds dynamic compressive strength in the process of supercritical carbon dioxide explosion.The medium outside smash area have a radial displacement under the effect of stress wave which cause the circumferential tensile stress,combined with the effects of gas wedge exceeds dynamic tension strength of the coal,forming fracture zone.Fracture extent and intensity are positively correlated with supercritical carbon dioxide explosion pressure.
Keywords：supercritical CO2gas explosionsmoothed particle hydrodynamicsstress wavenumerical simulation
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 501-506 )