Research On Gas Geology Regularity And Modeling Prediction In Xia Shijie Coal Mine

Coal face is the most centralized production place,meanwhile the main place of gasemission and accident frequency.Gas emission quantity of the coal face is a main aspects indesigning coal mine ventilation system,making gas prevention maesures and mine safetymanagement.The paper take Tong Chuan Xia Shijie coal mine as research object.Predictiongas emission quantity of coal face is dicussed mainly from three aspects in the paper.Firstly,By analyzing coal seam gas content,three factors of controlling gas content of the4-2coal seam are determined:The thickness from second part to the third part of Yananformation,Oil-abundance index of the seam roof,Main roof thickness (Xiaojie sandstone) ofthe4-2coal seam.Comprehensive consideration of geological factors,based on Grey SystemModeling Theory,coal seam gas content prediction model is established,The prediction gascontent results are basically consistent with the measured data in the scene.by useing thismethod in4-2coal seam in Xia Shijie Through analyzing the results of gas contentprediction,The distribution law of coal seam gas content is summarized.Secondly,Based on analyzed and summarized gas emission data of fully-mechanizedmining face that has been mined in Xia Shijie mine coal,five main controlling factors of coalface gas emission quantity are determined:embeding depth of coal seam,daily output,coalseam gas content,Oil-abundance of seam roof,daily cdvance.Using the method of stepwiseregression,Gas emission prediction model in non-mining areas has been established.the coalface gas emission prediction contour map is drawed.Finally,combined with the main geologic and productive factors which controlling gasemissiom quantity of mining face,Prsent a model GM(1.1)for the gas emission quantity of thecoal face based on the Grey System Theory,the absolute gas emission quantity of219miningface is predicted.The conclusion has important significance in adjusting mining face ventilationtimely,strengthening“one ventition three prevention”, preventing gas overrunning.