厚煤层遗煤复采巷道合理位置的确定OA

This paper aims to determine the reasonable position of the remaining roadway in old area of the thick coal seam.By taking 11#coal seam of the old area in a mine in Hegang,Heilongjiang prov-ince as the research background,the study includes analyzing mechanical state of the remaining coal by triaxial creep test,establishing the constitutive model of the coal seam and remaining coal pillar in the old area,using numerical simulation method to explore the stress distribution and failure characteristics of the remaining coal pillar,and analyze the displacement field of different remining roadway positions,so as to determine the reasonable position of the remaining roadway,and then apply it to engineering.The results show that under the confining pressure of 2 MPa,the low hardness coal sample has the whole process of"attenuation creep-stable creep-accelerated creep".Under the confining pressure of 4 MPa and 6 MPa,the high hardness coal samples have the plastic failure directly,without accelerated creep process.The creep of the remaining coal pillar is 10 a,with the plastic failure depth up to the maximum value of 9 m.The re-mining roadway is 15 m away from the remaining coal pillar,and the deformation of the surround-ing rock of the roadway is reduced by 59.52%,determining the more reasonable position.The field engi-neering application shows that the deformation of surrounding rock of re-mining roadway is smaller,meet-ing the needs of re-mining production.