doi:10.16186/j.cnki.1673-9787.2020030058

Received:2020/03/16

Revised:2020/10/13

Published:2022/03/15

Targeting drainage technology of roof sandstone water in super-long working face of Muduchaideng coal mine

WANGGuowen 1,2, YANXin 2,3, HEXiaolang 2,3, DINGXiang 2,3, XIAOLele 4

1.Ordos Yihua Mining and Resources Co. , Ltd. , Ordos 017318 , Innermongolia, China；2.China Coal Rock Burst & Water Hazard Control Center, Ordos 017000 , Innermongolia , China；3.China Coal Energy Research Institute Co. , Ltd. , Xi  ’ an 710054 , Shannxi, China；4.School of Geology and Environment, Xi ’ an University of Science and Technology, Xi  ’ an 710054 , Shannxi, China

Abstract: The deep Jurassic coalfield mines in Ordos basin are generally faced with some problems such as uneven water-rich distribution of roof,large amount of water falling in stope after mining,large amount of drainage works,and so on.The advantages and disadvantages of short-distance rotary drilling group hole drainage technology and long-distance directional drainage technology were analyzed.According to the mine sedimentary geological characteristics,based on the comprehensive geophysical exploration results and the drainage results of the mining face,it was considered that the aquifer of Zhiluo formation of 3-1 coal roof was the key aquifer for dewatering design.A water richness evaluation model including sandstone thickness,sedimentary environment impact index and core adoption rate was constructed by using AHP analytic hierarchy process,and the water richness of the drainage target face was evaluated.On this basis,the water targeting drainage technology of roof sandstone with the combination of long-distance directional drilling and short-distance rotary drilling group hole drainage is put forward and was put into practice in Muduchaideng coal mine.The results showed that the combined drainage method can effectively reduce the water level of the direct water-filled aquifer in the working face,and could drain the static reserves in the working face on a large scale.The beneficial exploration and engineering practice on the roof water drainage technology under the condition of extremely uneven water content of aquifer provided a reference for the treatment of roof water drainage in similar mines.

Key words:sandstone water;directional drilling;group hole drainage;targeting drainage;Muduchaideng coal mine

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