Influence of atmospheric pressure change on gas sampling in mine closed area

The variation of atmospheric pressure will cause the exchange of air volume between the closedareaofthemineandtheexternalenvironment,whichwillhaveanimpactonthegasmigrationin theclosedareaofthemine.Inordertostudytheinfluenceofthechangeofsurfaceatmosphericpressure onthegassamplingintheclosedareaofthemine,astatisticalanalysiswascarriedoutbasedonthe hourlyatmosphericpressuredatafrom2017to2018inDatongarea,andtheperiodicchangeruleofatmosphericpressure,thedistributiontimeofthepeakandtroughofthewaveandthechangeruleofthe leakage air volume in the closed area were determined.The results show that the variation of atmosphericpressure has annual periodicity,but the daily periodicity is poor,and it has a great influenceontheairvolumeexchangebetweentheclosedareaandtheexternalenvironment.Therefore, inordertoeffectivelyanalyzetheclosedareaoftherealgasstate,priorityshouldbegiventotheuseof tubesystemforcontinuoussamplingmonitoringanalysisofclosedarea.Atthesametime,theburied pipedepthshouldbedeterminedaccordingtothespecificparametersoftheclozedareaandthehourly variationlawoflocalatmosphericpressure,soastoeliminatetheinfluenceofairleakagefromtheexternalenvironmentonthedilutionofgasintheclozedarea.