WEI Y H, CUI J C, KAN X D, et al.Runoff channel identification of goaf water based on downhole tracer test[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(5):24-31.

doi:10.16186/j.cnki.1673-9787.2020100035

Received:2020/10/18

Revised:2021/04/21

Published:2022/09/25

Runoff channel identification of goaf water based on downhole tracer test

WEI Yahui1, CUI Junchao2, KAN Xuedong3, ZHANG Bo4, ZHANG Pingqing2, WANG Xinyi1,5,6

1.Institute of Resources and Environment，Henan Polytechnic University，Jiaozuo  454000，Henan，China；2.Pingdingshan Tian’an Coal Mining Co.，Ltd.，Pingdingshan  467000，Henan，China；3.Guhanshan Coal Mine，Henan Coking Coal Energy Co.，Ltd.，Jiaozuo  454000，Henan，China；4.The Research Institute， China Pingmei Shenma Group， Pingdingshan  467000，Henan，China；5.Henan Cooperative Innovation Center of Coalbed Methane（Shale）in Central Plains Economic Zone，Jiaozuo  454000，Henan，China；6.Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization，Jiaozuo  454000，Henan，China

Abstract:In order to find out the migration pathway of the goaf water and avoid mine flood accident，taking the Xiang’an Mine of Pingdingshan Xiang’an Coal Industry Co.，Ltd.as the research object，based on the analysis of vertical overlapping and plane staggered distribution characteristics of the goaf in multi-coal seam mining，the groundwater hydraulic connectivity and migration path were identified by the calculation of goaf compaction degree and the tracer test.The results indicated that from the auxiliary shaft to the groundwater outlet point，the flow velocity in goaf was 211.26~1 425.64 m/d，and the permeability coefficient was 509.06~5 964.29 m/d.The high flow velocity and permeability coefficient proved the existence of strong groundwater runoff channel；The migration path of goaf water was the coexistence of goaf seepage and roadway runoff.Among them，the waterflow from goaf to 22091 airflow roadway and two outlet points at No.42 conveyor roadway in No.9 coal mine were mainly transported by roadway runoff，from goaf to -593 m water drainage roadway，the waterflow was mainly migration by goaf seepage，and from goaf to the water outlet points at external opening of 16150 conveyor，the path was composed of roadway runoff and goaf seepage，and the roadway path accounted for a larger proportion.The research results could provide reference for accurate identification of goaf water transport path which was urgently needed in similar mines.

Key words:goaf;compaction degree;tracer test;permeability coefficient;migration path

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