Abstract:
Thecouplingcharacteristicsofcoalseamstress,fractureandseepagedirectlyaffectthemi⁃ grationcharacteristicsofpressurereliefgasduringtheprotectiveseammining*Inthispaper,combined withcubiclaw,themethodfortheselectionofthefluidsolidcouplingparametersofelasticjointsand persistentfracturewasproposedbasedontheexperimentaldataoftheelasticandpersistentfracture coalsamples*Meanwhile,thesimulationmodelingoffluidsolidcouplingfortriaxialflow testofcoal sampleswasbuilt*Onthebasisofthissimulationmethod,thecouplingcharacteristicsofthecoalsample stress,fractureandflowweresimulatedandanalyzedduringuniaxialandtriaxialloading*Thesimulation
resultsshow that the permeability of coal samples changes as S type with the increase of axial strain*Thepermeabilityofcoalsampledecreasesgraduallywiththeincreaseofaxialpressurebeforethe fractureofcoalsampledevelopment*Thepermeabilityofthecoalsamplesincreaseswiththedevelop⁃ mentofthefractures,andthefasterthefractureexpansionrateis,thehigherthepermeabilityincrea⁃ ses*Theincreaseofconfiningpressureresultedinthedecreaseofinternalfracturegenerationandprop⁃ agation,andthepermeabilityreductionstagewasextended*Theinitialpermeabilityandyieldingperme⁃ abilityofthecoalsamplesdecreasedgradually*